1. A process for recording data to a disc-shaped recording medium (101), comprising: recording at least one type of program information to a program area (104) of the disc shaped recording medium, and recording management data for managing the program information recorded in the program area (104), wherein the management data recorded in the management area made up of a plurality of frames (01 98) blocked with a pre-set block length; said each of the frames being made up of a synchronization signal section (136) and a plurality of subcode channels (137); said some subcode channels (137) are divided to several packs (4); said process for recording data to a disc shaped recording medium is characterized in that each pack (4) provides with letter (TEXT1-TEXT12) or character (S1-S14) information associated with each program information type recorded in the program area (104) as text information and complete identification code (ID) for identifying a type of letter (TEXT1-TEXT 12) or character (S1-S14) information of the respective pack (4).

2. The process for recording data to a disc-shaped recording medium as claimed in claim 1, wherein said identification code (ID) including at least one of the following codes: a code (ID1) capable of identifying at least one of a title of the program information recorded in the program area, a classification of the program information recorded in the program area, and a name of a producer; a code (ID2) determining whether or not the letter information associated with each program information type recorded in the program area can be copied on another recording medium; a code (ID4) identifying a conversation code format of the letter information associated with each program information type recorded in the program area; a code (ID3) identifying the number of letter types contained in the letter information associated with each program information type recorded in the program area; a code for discriniinating whether the letter information associated with each program information type recorded in the program area is TEXT data or DOT (i.e. graphics) data.

3. The process for recording data to a disc-shaped recording medium as claimed in claims 1 or 2, wherein one of said subcode channels (137) manages a recording position on said recording medium (101) associated with each type of program information recorded in said program area (104) and a recording capacity for all programs; and the remaining subcode channels of said plurality of subcode channels (137) are used for managing said letter (TEXT1-TEXT12) or character (sl-sl4) information associated with each program information type recorded in the program area as text information.

4. The process for recording data to a disc-shaped recording medium as claime d in claims 1 to 3, wherein the one of said subcode channels (137) is the Q channel and the other of said subcode channels (137) are the R-W subcode channels.

5. A process for recording data to a disc-shaped recording medium substantially as herein described with reference to the accompanying drawings.

TITLE OF THE INVENTION
BACKGROUND OF THE INVENTION Field of the Invention
This invention relates to a recording medium having the sub-code recorded thereon in association with main data, and a reproducing apparatus for reproducing the recording medium Description of the Related Art
In a compact disc reproducing apparatus for reproducing a disc-shaped recording medium, having the audio information recorded thereon, that is a compact disc (CD), various sorts of display are made on the basis of the disc management information for assisting the user m reproducing the disc
It has been practiced to reproduce and display the program number, or a so-called track number, or the tune information allocated to each track number, recorded under mode 1 in a Q-channel subcode, as later explained, as the display information based on the disc management information
An illustrative optical disc, such as CD, is shown m Fig 1
Referring to Fig 1, an optical disc 101 has a center aperture 102, and a lead-m area
103, operating as a table-of-contents area, or the program management area, a program area
104, havmg program data recorded therein, and a lead-out area 105, or a program end area, are formed for extending from the inner run towards the outer run of the optical disc 101 If the disc is an optical disc for audio data, havmg the audio information recorded thereon, the audio data is recorded m the program area 104, while the management information, such as the tune information for the audio data, is recorded m the program management area 103 When the readout of the audio data from the program area 104 by the CD reproducing apparatus comes to a close, and the optical pickup has reached the lead-out area 105, the CD reproducing apparatus completes the reproducing operation of the optical disc for audio data.
Fig.2 shows an illustrative CD reproducing apparatus
In this figure, a pickup 112 of the CD reproducing apparatus detects signals recorded on the optical disc for audio data 101, based on the light reflected from the optical disc 101, for generating RF signals, as playback signals, and focusing error signals and tracking error signals, as error signals The generated RF signals are sent to an analog waveform shaping circuit 114, while the focusing servo error signals are supplied to a focusing servo circuit 120 and the tracking servo error signal are supplied to a tracking and thread servo circuit 121
The analog waveform shaping circuit 114 waveform-shapes the RF signals from the pickup 112 for converting the RF signals into bi-level signals The digital bi-level signals, thus produced, are sent to a synchronization detection circuit 115 and a clock generating circuit 117 The clock generating circuit 117 generates playback clocks based on the digital bi-level signals from the waveshape forming circuit 114 The generated playback clocks are sent to the synchronization detection circuit 115, digital signal processing circuit 116 and to a rotation servo circuit 122 The synchronization detection circuit 115 detects the frame synchronization pattern from the digital signals, based on the playback clocks sent from the clock generating circuit 117, and sends the digital signal, from which the frame synchronization pattern has been detected, to the digital signal processing circuit 116
The digital signal processing circuit 116 decodes the digital signals from the synchronization detection circuit 115, from which the frame synchronization signals have been detected, based on the playback clocks from the clock generating circuit 117 and reference clocks supplied from a quartz oscillator 119, and sends the decoded digital signals to a subcodmg detection circuit 118, a D/A conversion circuit 123 and to a digital signal output terminal 125 The D/A (digital/analog) conversion circuit 123 converts the digital signal into analog signals which are sent to an audio amplifier 124 The audio amplifier 124 amplifies the analog audio signals from the D/A conversion circuit 123 and sends the amplified analog audio signals to an analog signal output terminal for the right channel and to an analog signal output terminal for the left channel
The subcodmg detection circuit 118 detects data of subcode P and Q channels as later explained from the digital signals of the digital signal processmg circuit 116 and sends the detected subcode channel data to the tracking and thread servo circuit 121
The focusing servo circuit 120 generates focusing driving signals, based on the focusing servo error signals from the pickup 112, and sends the focusing driving signals to the pickup 112 for controlling the focusing operation of the pickup 112 The rotation servo circuit 122 generates rotation control signals based on the playback clocks from the clock generator 117 and the reference clocks from the quartz oscillator 119 and sends the rotation control signals to the spindle motor 113 for controlling the rotation of the spindle motor 113
The tracking and thread servo circuit 121 generates tracking control driving signals, based on the tracking servo error signal from the pickup 112, and sends the tracking control signals to the pickup 112 The tracking and thread servo circuit 121 also generates thread servo signals, based on the tracking servo error signal, and causes the pickup 112 in its entirety to be transported along the radius of the optical disc 101 The tracking and thread servo circuit 121 also generates tracking position control signals, based on data from the P and Q channels, and transports the pickup 112 along the radius of the disc 101, based on the track position control signals, for performing accessing control
The subcode data and data of the P and Q channels will now be explained
The signals recorded on the optical disc for audio data are sampled with the sampling frequency of 44 1 Khz, with each word being 16 bits long The sampled 16-bit-per-word data is separated mto upper 8 bits and lower 8 bits, each of the upper and lower 8 bits bemg a symbol The error correction encoding and scrambling are performed on the symbol basis The data, thus processed, are grouped mto frames every four symbols This frame corresponds to the original 12 samples, that is 6 left stereo samples and 6 right stereo samples
Fig 3 shows the format of the signals grouped mto a sole frame Each frame 135 is made up of a synchronization pattern data area 131 of 24 channel bits, a subcoding area 132 of 14 channel bits, a program data area 133 of 12-symbol program data Dl to data D12, each composed of 14 channel bits, 4-symbol parity data area 134, each composed of 14 channel bits, another program data area 133 and another parity data area 134 In addition, 3-channel-bit junction areas are provided for junctions of the areas or data portions Therefore, each frame 135 is comprised of a sum total of 588 channel bits
Fig 4 shows 98 of the frames 135 grouped together and re-arrayed so that the respective areas and data portions of the frames are arrayed contiguously m the vertical direction These 98 frames, grouped together, are also termed collectively as a frame However, for distinction from the frame of 588 channel bits, the 98 frames, grouped together, as shown in Fig 4, are sometimes termed a subcoding frame This subcoding frame is made up of a frame synchronization pattern section 136, a subcoding section 137, and a data and parity section 138 Each subcoding frame corresponds to one-75th of a second of the usual CD playing tune
The sub-coding data, inclusive of P and Q channel data sent from the subcoding detection circuit 118, has been recorded in the subcoding unit 137 shown in Fig 4 The sub-coding unit 137 is of a structure m which 98 frames, namely frame F01 to frame F98, make up one block, that is a sub-coding frame, as shown in Fig 5 The frames F01 and F02 represent block synchronization patterns and simultaneously out-of-rule patterns SO and SI of the 8-14 modulation system The subcoding detection circuit 118 shown m Fig 2 detects the synchronization pattern to form a subcoding section 137 for one block On the other hand, respective bits of the frames from F01 to F98 constitute channels from channel P to channel W For example, the channel P is made up of portions of the patterns SO and SI and P01 to P98
It is noted that data of 6 channels from channel R to channel W are used for still pictures or for special uses, such as for representing letters for karaoke The P-channel and Q-channel data are used for controlling the accessing operations, for example, for controlling the pickup track positions
In addition, since the time information for the number or the contents of programs is recorded m the subcode Q-channels, this information is displayed on, for example, a display device, such as an LCD display device, for assisting the user to visually recognize the program number of the program bemg played, play time elapsed or the absolute tune smce the start of reproduction
In the above-described optical disc device, the user may feel like acquiring not only the program tune information but also the information on the album name, performer,
program name or the composer In particular, an optical disc reproducing apparatus having a disc exchange function, that is designed to hold plural optical discs and to reproduce a desired one of the discs, has become widespread, such that it has become necessary to visually check which is the optical disc being reproduced It is sometimes desirable that the program or the album name be displayed not only in an optical disc reproducing apparatus fitted with the disc exchange function but also m a usual optical disc reproducing apparatus
However, since no letter information is mcluded in the information recorded on the above-mentioned conventional optical disc, the title of the optical disc being reproduced or the program name being played cannot be displayed on the display device, such that it cannot be visually checked which of the optical discs is being displayed
It is therefore contemplated to use a recording medium m the Q-channel of which is written the text information ancillary to the mam data. However, because of the limitation of the number of letters, sufficient text information sometimes cannot be recorded in case the text information needs to be written m one CD m plural languages
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a recording medium capable of recordmg a large quantity of the letter information that can be taken out without usmg special decodmg means, and a reproducing apparatus for reproducmg such a recordmg medium
It is another object of the present invention to provide a recordmg medium and a reproducmg apparatus capable of detecting the letter information directly after disc insertion without imposing excessive loads on the disc producer or on the disc reproducmg apparatus
In one aspect, the present mvention provides a disc-shaped recordmg medium including a program area havmg recorded thereon at least one type of program information and a management area for managing the program information recorded m the program area, wherein data recorded m the management area is made up of a plurality of frames blocked with a pre-set block length Each of the frames is made up of a synchronization signal section and a plurality of subcode channels and one of the subcode channels manages the recordmg position associated with each program information type recorded m the program
area and the recording capacity for all programs The subcode channels other than the aforementioned one of the plural subcode channels are used for managing the letter information associated with each program information type recorded m the program area as text information and for managing an identifier identifying the type of the letter information
In another aspect, the present invention provides an apparatus for reproducing a discshaped recording medium of a type which includes a program area having recorded thereon at least one type of program information and a management area for managing the program information recorded m the program information, wherem data recorded m the management area is made up of a plurality of frames blocked with a pre-set block length, and each of the frames is made up of a synchronization signal section and a plurality of subcode channel data, one of the subcode channel data managing the recording position associated with each program information type recorded m the program area and the recording capacity for all programs, subcode channel data other than the aforementioned one of the plural subcode channel data being used for managing letter information associated with each program information type recorded in the program area as the text information and for managing an identifier identifying the type of the managed letter information The reproducing apparatus mcludes read-out means for reading out data from the disc-shaped recording medium, separating means for separating a plurality of the subcode channel data recorded in the management area of the disc-shaped recording medium into the aforementioned one subcode channel data and the other subcode channel data by the read-out means, discrimination means for extracting a mode information contained m the other subcode channel data separated by the separating means for discriminating the type of the recording medium, decoding means for extracting the letter information contained m the other subcode channel data separated by the separating means for decodmg, and display means for displaying the decoded letter information from the decodmg means
The present mvention provides a recording medium m which only data demarcations are modified using an existing format as a data format, with the mode information bemg of the same configuration as that of the existing recording medium, and in which modes not assigned to existing modes are defined as the modes in which to record the type information
specifying the types of the information recorded on the pack and the text information ancillary to the main data, such that the recording medium may be reproduced by an existing reproducing apparatus havmg a simplified additional structure In addition, a large quantity of the letter information can be recorded by employing R to W channels
By data overwriting, error detection can be done during data readout from the recording medium By annexing a simplified structure to an existing reproducmg apparatus, readout errors may be corrected by re-reading the portion of the recording medium where errors have been found without the necessity of performing complex error correction If plural recordmg media are loaded on the reproducmg apparatus for reproducmg pre-set recording media, the information on the recordmg medium from which data is currently read out is displayed by letters, the reproducing apparatus can be handled more easily
The foregoing and other objectives, features and advantages of the invention will be more readily understood upon consideration of the following detailed description of certain preferred embodiments of the mvention, taken m conjunction with the accompanying drawings
BRIEF DESCRIPTION OF THE DRAWINGS
Fig 1 illustrates a conventional disc-shaped recordmg medium for audio data.
Fig 2 illustrates a reproducmg apparatus for reproducmg the conventional discshaped recordmg medium for audio data
Fig 3 illustrates a data structure recorded on the conventional disc-shaped recordmg medium for audio data
Fig 4 illustrates 98 of frames of Fig 3 stacked together to from a block
Fig 5 shows data of Fig 4 arrayed vertically for illustrating the subcode
Fig 6 shows the subcodes R to W in the 98-frame block divided mto four packs
Fig 7 shows a detailed data structure of the packs of Fig 6
Fig 8 shows 6 bits of R to W channels to form one symbol
Fig 9 schematically shows a plurality of symbols of Fig 8 connected sequentially for handling on the 8-bit basis
Fig 10 shows the data structure of an identification code ID1
Fig 11 shows a data structure provided under mode 4
Fig 12 shows the data structure of the identification code ID1 shown in Fig 11 Fig 13 is a table showing the types of the identification code shown in Fig 11 Fig 14 shows a data structure of an identification code ID2 under mode 4 Fig IS shows a data structure of an identification code ID3 under mode 4 Fig 16 shows a data structure of an identification code ID4 under mode 4 Fig 17 shows a data structure of an identification code ID1 under mode 4 Fig 18 shows a data structure for a text block m a pack in case of specifying the size information of Fig 17
Fig 19 shows a data structure m a pack in case of specifying the program name with an identification code ID1 under mode 4
Fig 20 shows illustrative program names in case of specifying the program name with an identification code ID1 under mode 4
Fig 21 is a block diagram showing a reproducing apparatus for reproducmg a discshaped recording medium according to the present invention
DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, illustrative embodiments of a recordmg medium and a reproducmg apparatus according to the present invention will be explained m detail
The recordmg medium is an optical disc, as a disc-shaped recordmg medium, havmg the above-mentioned subcodmg frame m its data structure In the optical disc, havmg the sub-code recorded m association with the mam data, shown m Fig 6, data is constructed on the packet basis, each packet bemg made up of four packs, each pack bemg made up in turn of 24 6-bit symbols, with the six bits making up each symbol bemg associated with the subcode channels R to W At the leadmg position of each pack is recorded the mode information for setting the recordmg mode of the information recorded m the pack Each pack is comprised of a text area 2 for recording the text information obtained on the basis of the letter information ancillary to the mam data on the 8-bit basis, and an ID area 1 for recordmg the type information specifying the types of the text information
In each pack, there is also recorded data for error correction by cyclic redundancy code (CRC) as 16-bit error correction code
Before explaining the R to W subcode channels, the data format for recording the graphics information for CD-G (CD graphics) is explained
Fig 7 schematically shows the structure of a subcoding section 137 shown m Fig 5
Each subcode is formed by eight bits, with the group of bits constituting the subcode bemg divided mto eight channels of P, Q, R, S, T, U, V and W The subcoding section 137 is made up of 98 frames each constituted by channels P to W
The first two frames are the aforementioned synchronization patterns The third frame up to the 98th frame are made up of a block 12, termed a subcode P, made up only of P-channel data, a block 13, termed a subcode Q, made up only of Q-channel data, and a block 11 made up only of data from channels R to W
In a system of recording/reproducing the video information as the subcode, 6 bits of the channels R to W make up one symbol, and the smallest data unit is made up of 24 symbols of from 0 to 23 to form a pack That is, each block 11 is divided mto four packs
Of the 24 symbols, forming each pack, the first symbol (symbol 0) denotes the mode by three bits from the MSB side, while denotmg an item by three bits from the LSB side This symbol 0, denotmg the mode and the item, is followed by a symbol 1 which is an instruction denotmg the instruction type The symbols 3 and 4, following the instruction, are a parity Q, as an error correction code The symbols 4 to 19, following the parity Q, represent a data field and mclude e g, the color information The symbols 20 to 23, following the data field, are a parity P which is an error correction code for protecting the information m the pack
There are four modes, namely the zero mode, lme graphics mode, TV graphics mode and the user mode
The zero mode is such a mode in which no operation is done on a display screen, that is a mode for outputting the picture as it is, with the data m the pack bemg all zero The line graphics mode is a mode m which a liquid crystal display or the like is provided on the
front side of the player for displaying a legend for a musical number Hie TV graphics mode is a mode for displaying a picture on a TV screen
Among video processing commands, there are a command for painting out an entire screen with a certain color, a command for drawing a picture using two sorts of colors for a font on a screen, and a command for shifting the screen m its entirety in the longitudinal or transverse directions For the graphics display employmg the channels R to W, dedicated signal processing is required since data is handled as dot data. This technique is disclosed in, for example, JP Patent Publication Kokai JP-A-58-133689 (1983)
However, a dedicated processing circuit is required for processing data of the channels R to W In addition, the processing circuit is known to be complex because of the complex method of error correction and detection employmg the panties P and Q Thus die above structure is thought to be inadequate for application in which simply the letter information is recorded or reproduced in or from the subcodes of the channels R to W
Therefore, a demand is raised for a recording medium of a format in which a processmg circuit of a simpler structure suffices for utilizing the channels R to W
Fig 9 shows a serially arranged data format shown m Fig 6
In Fig 9, 4-symbol 24-bit data is divided mto three 8-bit bytes If signal processmg can be done on the 8-bit basis, processmg can be done by a processmg method for processmg Q-channel signals, so that a processmg circuit of a simpler structure suffices
In the data format shown m Fig 7, the error correction method employmg the parity P and the parity Q is used, whereas, m the data format for the recording medium of the present invention, only error detection is done with the use of the error detection by CRC If errors are detected, data is agam read out Thus the signal is written m quadruple on a pack basis and is repeatedly written m the packet period from the start of a data string until its end This eliminates the necessity of usmg a complex processmg circuit for error correction
However, pack-based multiple recording need not be quadruple recorded and the multiple recording unit need not be a pack unit For example, multiple recording can be done on the packet basis, or m terms of several packets as a unit
The leading type block ID1 of the ID area 1 is made up of 8 bits larger by 2 bits than the usual symbol, as shown m Fig 10 For preventmg malfunctioning of a reproducmg apparatus designed for decoding the channels R to W, three bits beginning from the MSB is handled as mode data. With the recording medium of the present invention, the mode represented by these three bits is an undefined code, for example, a mode 4 ("100") In this case, if the recording medium is loaded on the conventional reproducmg apparatus, only an unidentifiable mode is detected, so that the reproducmg apparatus merely is halted without malfunctioning Undefined modes 5 and 6 may also be used in place of the undefined mode 4 For reference, modes 1 and 3 are already used for CD-G (graphics) and for CD-MIDI, respectively
The data format m the pack for the mode 4 is compnsed of type blocks ID1, ID2, ID3 and ID4, each made up of 8 bits, text blocks textl to textl2 and a 12-bit CRC block, as shown in Fig 11
The block ID1 is of an 8-bit structure, as shown m Fig 12 The data compnsed m the pack is classified by the code recorded as shown in Table shown m Fig 13
In this figure, "80h" in hexadecimal notation specifies that the pack represents each data size as later explained Similarly, "81h" and "82h" specify the disc ID and genre code, respectively, while "83h" and "84h" are reserved for enabling expansion On the other hand, "85h" denotes the title of an album recorded on a disc and "86h" denotes the title of music of a program The next series of codes denote, generally, those who could be considered producers of the program, i e "87h" denotes the name of artist, "88h" denotes the name of a conductor, "89h" denotes the name of a group or an orchestra. In addition, "8bh" denotes the name of a composer, "8ch" and "8c" denote the names of songwriters and "8dh" and "8d" denote the names of arrangers
The leadmg numerals in all codes are commonly "8" in hexadecimal notation m order to set "1" at the MSB bit m binary notation If the code of the ID 1 is judged based on three bits beginning from the MSB, the mode can be identified to be the mode 4
The MSB of the block ID2 is a copy control flag, as shown m Fig 14 The MSB of "0" or "1" mdicates copy permit and copy inhibit, respectively The remaining 7 bits specify
the program number (track number) The block number ED3 denotes a number of characters code, as indicated m Fig 15 If the number of letters is excessive such that a letter exists over plural packs, the forwardly positioned pack denotes the number of pre-recorded letters This is explained m further detail in Fig.20
As for the block ID4, four bits beginning from the MSB specify a character code, while two bits next following the character code specifies a multilingual code and two bits on the LSB side denotes the pack number, as shown m Fig 16 If the character code is "0000", it specifies a 1-byte ASCII code, whereas, if it is "0001", it specifies an 8859-1 ASCII code of the same 1-byte code If the character code is "1000", it specifies an MS-US code of the 2-byte code
As for the two-bit multilingual code, "00", "01", "10" and "11" are defined as bemg the first, second, third and fourth languages, respectively, as shown in Fig 11 The languages recorded m textl to textl2 are specified by the recorded two blocks In textl to textl2, shown m Fig 11, data concerning the contents shown by ID1 are recorded in character codes and languages specified by ID4
An example of the data format of the mode 4 is shown in Fig 17 as the data structure of a pack whose ID1 is "80h", that is a pack specifying data concerning the size of each information item (size information) Each one pack specifying the size information is provided for each optical disc
In Fig 17, the type blocks are only the ID1 and ID4 In 14 blocks of SI to S14, excluding these type blocks and CRC blocks, totalling 112 bits, data specifying something like a recording map for data recorded on an optical disc are recorded, as shown in Fig 18
That is, blocks si and s2 are constituted by two blocks, two MS side bits, that is two bits towards the block si, are reserved, while the two succeeding bits specify a multilingual code The remaining 12 bits specify the total number of packs (total pack number) That is, the total number of packs is 4096 at the maximum
The block s3 specifies the total number of packs used for data of the album titles (total pack number of music title), while the block s4 specifies the total number of packs used for data of the program titles
The block s5 specifies the total number of packs used for the artist's name (total pack number of artist's name), the block s6 specifies the total number of packs used for the conductor's name (total pack number of conductor's name), and the block s7 denotes the total number of packs used for the artist's name or orchestra's name (total pack number of group's name)
The block s8 specifies the total number of packs used for the composer's name (total pack number of composer's name), while the block s9 specifies the total number of packs used for the songwriter's name (total pack number of songwriter's name) The block slO specifies the total number of packs used for the arranger's name (total pack number of arranger's name), while the block sll specifies the total number of packs used for the disc ID (total pack number of disc ID)
The blocks sl2 and sl3 specify the total numbers of packs used for data corresponding to "83h" and"84h" of the ID 1 (total pack number of ID = 83h, total pack number of ID = 84h) That is, three blocks prescribe the amount of data for a portion reserved for extension Finally, the block sl4 is a simply reserved block
Fig 19 shows, as another example of the data format of the mode 4, the data structure of a pack whose ID1 is "86h", that is a pack specifying the name (title of music) from program to program
Referring to Fig 19, the type information is recorded m blocks ID1, ID2, ID3 and ID4, while the text information is recorded from text block textl to text block text 12 A CRC block is provided at the trailing end
A track overhead is first defined The track overhead is made up of two text blocks, that is two-byte data, termed trextl and text2 The track overhead is provided at the leading end of the text information of each track
In Textl, there is recorded the genre code in a binary code, while m Text2, there is recorded the program number
The text block next following the track overhead is Text3, the information of each program begins from Text3 and a text block of the zero code (null code) is inserted at the trailing end If two character codes are used for the text block, two zero codes are ultimately
arrayed Thus the track overhead is provided next to the null code track block in such an area where there is provided the next program
Fig.20 shows an example of the above-described data structure
In this figure, program titles are recorded in the program sequence, specifically, the first program title "BAD", the second program title "THE WAY YOU MAKE ME FEEL", the third program title "SPEED DEMON" and the fourth program title "LIBERIAN" and so forth, are recorded m this order
Between the programs is recorded, as the above text overhead, a text block corresponding to Textl, beginning from "17h" Next to "17h", there is provided a text block Text2 having recorded thereon data specifying the program sequence For specifying the first program, "Olh" is recorded m Text2 At the trailing end of each track, there is provided a text block havmg "OOh" recorded therein
Referring to Fig20, there is mcluded in ID 1 an identification code specifying the program title for each program corresponding to the title of music "86h", while "Olh" is mcluded in ID2 The upper four bits, which are zero, specify copy permit, while the lower four bits, which are 1, specify that the next following TEXT data corresponds to the first program
There is recorded "OOh" in ID3, specifying that the letter information recorded m this pack 0 corresponds to the leading end of a letter
There is recorded "OOh" m ID4 The upper four bits, which are 0, specify the ASCII code, while the upper two of the lower four bits, which two bits are 0, specify that the next following TEXT data is the language 1, and the lower two of the lower four bits, which two bits are 0, specify that the PACK number is 0
There is recorded "17h" m TEXT1, specifying the leadmg end of the text, while there is recorded "Olh" in TEXT2, specifying that the next following TEXT data corresponds to the first program
In TEXT 3 to TEXT5, there is recorded an ASCII code corresponding to "BAD", while, m TEXT6, there is recorded "OOh" specifying the end of the program title
There is recorded "17h" in TEXT7, specifying the leading end of the program title recorded in the second place, while there is recorded "02h" in TEXT8 specifying that the next following TEXT data corresponds to the second program
In TEXT9 to TEXT12, there is recorded text data corresponding to the second music number as the ASCII code In the present embodiment, the leading word "THE" of "THE WAY YOU MAKE ME FEEL" is recorded For SP of TEXT12, the ASCII code specifying a space is recorded
The title of the second music number is made up of as many as 24 letters which cannot be accommodated m TEXT9 to TEXT12, so that the next pack is used
The 2-byte CRC code is then annexed
The identification code specifying the program title for each program corresponding to the title of music "86h" as ID1 is included in the leading end of the next pack, while "02h" is recorded m ID2 The upper four bits, which are 0, specify copy permit, whereas the lower four bits, which are 2, specify that the next following TEXT data corresponds to the second program
There is recorded "04h" in ID3, specifying that four letters, namely three letters "THE" and a space, have already been recorded in the pack 0
There is recorded "Olh" m ID4 The upper four bits, which are 0, indicate the ASCII code, while the lower two of the lower four bits, which are 1, specify that the PACK number is 1
In TEXT1 to TEXT12, "WAY YOU MAKE", which have not been accommodated m pack number 0, is recorded
In the pack number 2, an identification code, indicating the program title of each program corresponding to the title of music "86h" is recorded as ID1 at the leading end In ID2, "02h" is recorded, of which the upper four bits, which are 0, indicate copy permit, whereas the lower four bits, which are 2, specify that the next following text data correspond to the second program
There is recorded "lOh" m ID3, specifying that 16 letters and spaces of "THE WAY YOU MAKE" have already been recorded m the packs 0 and 1
There is recorded "02h" in ID4, of which the upper four bits, which are 0, indicate the ASCII code, and the upper two of the lower four bits, which are 2, specify that the PACK number is 2
In TEXT1 to TEXT8, " ME FEEL", which have not been accommodated m pack number 1, is recorded.
In TEXT9, "OOh", indicating the end of the program title, is recorded
There is recorded "17h" m TEXT10, indicating the leading end of the program title recorded m the third place, while there is recorded "03h" m TEXT11 specifying that the next following TEXT data corresponds to the third program There is recorded m TEXT12 the ASCII code corresponding to "S" which is the leading letter of "SPEED DEMON" of the third program title The 2-byte CRC code is then recorded
In the leading end of the pack number 3, an identification code mdicatmg the program title for each program corresponding to the title of music of "86h" as ID1, while "03h" is recorded in ED2, of which the upper four bits, which are 0, indicate copy permit, and of which the lower four bits, which are 3, specify that the next following TEXT data is the title corresponding to the third program
There is recorded "Olh" m ID3, specifying that a letter "S" has already been recorded m the pack 1
There is recorded "03h" in ID4, of which the upper four bits, which are 0, indicate the ASCII code, and the upper two of the lower four bits, which are 0, specify that the next following TEXT data is language 1, while the lower two of the lower four bits, which are 3, specify that the PACK number is 3
In TEXT1 to TEXT10, "PEED DEMON", which have not been accommodated in pack number 2, is recorded
In TEXT11, "OOh", indicating the end of the program title, is recorded
There is recorded "17h" m TEXT12, indicating the leading end of the program title recorded m the fourth place
Two bytes of the CRC code are then appended
The above four packs complete one packet
In the leading end of the pack number 0 of the next following packet, there is similarly recorded an identification code indicating the program title for each program corresponding to the title of music of "86h" as ID1, while there is recorded "04h" m ID2, of which the upper four bits, which are 0, indicate copy permit, while the lower four bits, which are 4, specify that the next following TEXT data is the title corresponding to the fourth program
There is recorded "OOh" in ID4, of which the upper four bits, which are 0, indicate the ASCII code The upper two of the lower four bits, which are 0, specify that the next following TEXT data is of a language 1, while the lower two of the lower four bits, which are 0, specify that the PACK number is 0
In TEXT1 to TEXT9, "LIBERIAN", which has not been accommodated m the pack number 2, is recorded
The description on TEXT10 and so forth is omitted for simplicity
The information on other letters is recorded m the same way as the information on the program titles of the respective programs
Referring to Fig 21, a reproducing apparatus for reproducing a recordmg medium according to the present invention, is such an apparatus designed to reproduce a recordmg medium m which 24 symbols, each made up of six bits corresponding to R to W channels of the subcode recorded m association with the mam data, are grouped together as one pack, four packs are grouped together as one packet, data is constructed on the packet basis, the mode information for setting the recordmg mode of the information recorded m the pack is recorded at the leadmg end of each pack and the information recorded in each pack is 8-bit based type information and 8-bit based text information The reproducing apparatus mcludes an optical pickup 42 for reading out the recordmg medium, a signal processmg circuit 45 for taking out the subcode from the signal read out from the optical pickup 42 and a subcode separation circuit 51 for separating the subcode taken out by the signal processmg circuit 45 mto the Q-channel and mto R to W channels The reproducmg apparatus also mcludes a disc discrimination circuit 66 for taking out the mode information of the subcode of the R to W channels separated by the subcode separation circuit 51 and for discriminating the type of the
recording medium based on this mode information, a subcode processing circuit 54 for processing the subcodes of the R to W channels sent from the subcode separation circuit 51 and a character display unit 58 for displaying the character information of the information processed by the subcode processing circuit 54
Referring to Fig.21, a desired one of plural optical discs 41, such as CDs, may be selected and reproduced by the auto-changer function The optical disc 41, selected by this auto-changer function, is rotated by a spindle motor 43, so that its recording contents are optically read out by the optical pickup 42 The signals from the optical pickup 42 are sent via an optical signal processing circuit 44 to a digital signal processing circuit 45 The digital audio signal components output from the digital signal processing circuit 45 are converted by a digital/analog (D/A) converter 47 mto analog audio signals which are taken out at an analog audio signal output terminal
In the digital signal processing circuit 45, the above-mentioned subcode is taken out and outputted to the subcode separation circuit 51
The subcode taken out from the digital signal processing circuit 45 is separated by the subcode separation circuit 51 mto the Q-channel sent to the time information processing circuit 52 and into R to W channels sent to the subcode processmg circuit 54 and to a disc discrimination circuit 66
The time information processmg circuit 52 sends the tune information managed by the Q-channel to a tune display unit 53 for time display
The disc discrimination circuit 66 takes out the mode information written m the R to W channels and discriminates whether or not the inserted optical disc is such an optical disc m the R to W channels of which have been recorded the type information and the text information If the optical disc has been found to be such an optical disc m the R to W channels of which have been recorded the type information and the text information, the disc discrimination circuit 66 outputs an operation input signal to the subcode processmg circuit 54 If the optical disc is other than the above-mentioned optical disc, and is such an optical disc m the R to W channels of which has been recorded the graphic information, the disc
discrimination circuit 66 outputs an operation input signal to the graphics processing circuit 48
If the subcode processing circuit 54 is supplied with an operation input signal from the disc discrimination circuit 66, that is if the loaded optical disc is such an optical disc m the R to W channels of which have been recorded the type information and the text information, the subcode processmg circuit 54 outputs the information of respective items, obtained on processmg the R to W channels from the subcode separation circuit 51 based on pre-set conversion codes, such as the above-mentioned ASCII codes Such information, obtained on processmg the R to W channels, may be exemplified by the genre information 55a, disc ID information 55b, letter information 55d, such as titles of album or artist, or the size information 55e
The letter information 55d, separated from the subcode processmg circuit 54, is sent to a letter contents separation circuit 57 for selectively separating display items or contents responsive to the operation of the display contents switch 56 The separated data is sent to the character display unit 58 for display
The genre information 55a, separated by the subcode processmg circuit 54, is sent to a control circuit 60 employing a so-called CPU which then manages control for reproducing only the musical number or disc of the genre designated by the user To this control circuit 60 is connected a semiconductor memory, such as RAM 61, so that the genre information designated by the user pressmg a genre switch 62 is stored m the RAM 61 The control circuit then discriminates whether or not the designated genre information comcides with the genre information 55a from the subcode processmg circuit 54 If the result mdicates coincidence, the control circuit controls the servo circuit 65 for reproducing the disc In an auto-changer type, only the disc mdicatmg such genre comcidence is reproduced, while the discs are automatically changed, so that only the disc of a pre-set genre may be selectively reproduced
The disc ID information, e g copy information, from the subcode processmg circuit 54 is sent to the control circuit 60 where it is used to realize the operation of the auto-changer efficiently
The disc size information SSe from the subcode processing circuit 54 is sent to a TOC readout queue tune processing circuit 64 This TOC readout queue time processing circuit 64 calculates the tune needed to read out all of the R to W channels, that is the queue tune, based on the sub-Q error information 63 specifying whether or not the Q-channel data has been regularly read out by the signal processing circuit 45 and on the size information 55e, and sends the calculated queue time to the tune display unit 53 This queue tune may be displayed on a character display unit 58 The sub-Q error information circuit is supplied with subcode information from the digital signal processing circuit 45
If the operation input signal is sent from the disc discrimination circuit 66 to the graphics processing circuit 48, that is if the loaded optical disc has recorded thereon the graphics code inclusive of the above-mentioned picture information and the letter code having pre-set dot pattern associated with letters, the graphics processing circuit 48 processes the graphics code and the letter code m a pre-set manner for producmg display data.
The graphics display circuit 49 displays the data on a display screen, based on display data from the graphics processmg circuit 48, and outputs this display data from the graphics output terminal, based on the display data from the graphics processmg circuit 48
Although the present invention has been shown and described with respect to the preferred embodiments, various changes and modifications are deemed to he within the spirit and scope of the invention as claimed

WE CLAIM:
1. A process for recording data to a disc-shaped recording medium (101), comprising:
recording at least one type of program information to a program area (104) of the disc shaped recording medium, and
recording management data for managing the program information recorded in the program area (104), wherein the management data recorded in the management area made up of a plurality of frames
(01 98) blocked with a pre-set block length; said each of the
frames being made up of a synchronization signal section (136) and a plurality of subcode channels (137); said some subcode channels (137) are divided to several packs (4);
said process for recording data to a disc shaped recording medium is characterized in that each pack (4) provides with letter (TEXT1-TEXT12) or character (S1-S14) information associated with each program information type recorded in the program area (104) as text information and complete identification code (ID) for identifying a type of letter (TEXT1-TEXT 12) or character (S1-S14) information of the respective pack (4).
2. The process for recording data to a disc-shaped recording medium as claimed in claim 1, wherein said identification code (ID) including at least one of the following codes:
a code (ID1) capable of identifying at least one of a title of the program information recorded in the program area, a classification of the
program information recorded in the program area, and a name of a
producer;
a code (ID2) determining whether or not the letter information
associated with each program information type recorded in the
program area can be copied on another recording medium;
a code (ID4) identifying a conversation code format of the letter
information associated with each program information type recorded
in the program area;
a code (ID3) identifying the number of letter types contained in the
letter information associated with each program information type
recorded in the program area;
a code for discriniinating whether the letter information associated
with each program information type recorded in the program area is
TEXT data or DOT (i.e. graphics) data.
3. The process for recording data to a disc-shaped recording medium as claimed in claims 1 or 2, wherein
one of said subcode channels (137) manages a recording position on said recording medium (101) associated with each type of program information recorded in said program area (104) and a recording capacity for all programs; and the remaining subcode channels of said plurality of subcode channels (137) are used for managing said letter (TEXT1-TEXT12) or character (sl-sl4) information associated with each program information type recorded in the program area as text information.
4. The process for recording data to a disc-shaped recording medium as claime d in claims 1 to 3, wherein the one of said subcode channels (137) is the Q channel and the other of said subcode channels (137) are the R-W subcode channels.
5. A process for recording data to a disc-shaped recording medium substantially as herein described with reference to the accompanying drawings.