The present invention relates to reproducing apparatus for recording data from recordable disc and/or a replay -only disc
This invention relates to a disc recording/reproducing apparatus adapted to implement bit compression processing to successively inputted data caused to be in a digital form to record/reproduce them through a disc
This application is a divisional out of Indian Patent Application No 849/Del/92 filed September 22, 1992 now Patent No 185,888
Description of the Prior Art
Optical discs can have a recording capacity greater than that of
magnetic discs by of 2-3 figures or digits, and can make a higher speed
access than that in a recording medium m a tape form Further, such
optical discs can carry out recording/reproduction of data in a manner to
be not in contact with a medium, thus advantageously providing an
excellent durability For these reasons, optical discs have been
frequently used in recent years For such optical disc, so called CDs (Compact Discs) are most popularly known
Meanwhile, in the case of attempting to provide, by using an optical disc, a portable recording/reproducing equipment, particularly a head phone stereo equipment of about so-called a
pocket size, or a recording and/or reproducing apparatus similar thereto, in existing CDs as described above, for example, there are standardized formats for a CD of a disk diameter of 12 cm and a CD of a disk diameter of 8 cm (so called a CD single type) However, in the case of the disk having a diameter of 12 cm, the outside dimension of the recording/reproducing apparatus becomes too large, resulting in poor portability For this reason, it is conceivable to use a disk having a diameter of 8 cm or less However, in the case of attempting to constitute a portable recording and/or reproducing apparatus or an apparatus of about a pocket size by using an optical disk having a diameter of about 8 cm or less, there are the following problems
First, in a standard CD format (CD-DA format) such that optical disks, on which stereo digital PCM audio soud having a sampling frequency of 44 1 KHz and subjected to 16 bit quantization are recorded, are supplied from the maker side, and only reproduction or playback is conducted on the user side, the reproduction or playback time (recording time) of the disk having a diameter of 8 cm 1 s a short value of about 20 to 22 minutes even at the maximum, so it would be unable to entirely record a symphony of a classic music For the reproduction or playback time, about 74 minutes or more at the maximum the same order as that of the 12 cm CD presently available is expected Further, in the CD-DA format, recording cannot be carried out on the user side In addition, a non-contact optical pick-up device is
easily affected by mechanical vibration, ptc , so deviation in tracking and/or defocusing (deviation infocusing), etc are apt to occur by vibration, etc For this reason, in the case of carrying such equipment, any very effective measure for suppressing bad influence on the reproducing operation due to deviation in tracking or defocusing, etc is required
Further, in a CD-MO format (format using a recordable magneto-optical disk) as an extended format of the standard CD format (CD-DA format), the recording/reproducing time of a disk having a diameter of 8 cm is disadvantageously a short time of about 20 to 22 minutes the same as that of the CD-DA format In addition, the deviation in tracking and/or defocusing of an optical pick-up device resulting from mechanical vibration, etc are apt to occur For th"'s reason, any measure for preventing bad influence on the recording/reproducing operation resulting therefrom is required
In a CD-I (CD-I nteracti ve) format, as a mode for recording/reproduci ng a bit-compressed digital audio signal, respective levels as shown in the following Table are standardized.

(Table Removed) …………1
In this Table 1, when a disk recorded, eg in the B level mode is reproduced, a signal obtained by bit-compressing a digital signal of the standard CD-DA format so that its signal density becomes equal to an approximately quadruple value (a. value about four times grater than that of the original signal) is reproduced Accordingly, for example, when all recording data are stereo audio compressed data, reproduction of a time four times (four channels) greater than the standard time can be carried out As a result, even with an optical disk having a diameter of about 8 cm or less, recording/reproduction of about 70 minutes can be carried out
Meanwhile, in the above-mentioned CD-I format, because a disk is rotationally driven at the same linear velocity as that of the standard CD-DA format, successive audio compressed data will be reproduced at a rate of 1/n recording units on the disk
This unit is called a block or sector One block (sector) is comprised of 98 frames, and the period is 1/75 seconds In this instance, n is the above-mentioned reproduction or playback time or a numeric value corresponding to bit compression ratio of data For example, in the B level stereo mode, n is equal to 4 Accordingly, in the B level stereo mode, a data train in which ones of respective four sectors are respectively caused to serve as an audio sector as indicated below
SDDDSDDD
(S is an audio sector, and D is any other data sector) are recorded on a disk It is to be noted that since, at the time of an actual recording, a predetermined encode processing {error correction coding processing and interleaving processing similar to that for audio data of an ordinary CD format is implemented to the above-mentioned data train, data of the audio sector S and data of the data sector D are arranged in a distributed manner in recording sectors on the disk Here, e g , video data or computer data,( is used as any other data sector D mentioned above In the case where bit-compressed audio signals are used also for the data sector D, data train [S1, S2 , S3, S4, SI, S2, S3, S4 ] in which audio sectors S1 - S4 of four channels are cyclically arranged in a successive manner will be subjected to encode processing and are recorded on the disk
In the case of recording/reproducing successive audio
signals, the above-mentioned audio signals of four channels such that they are connected in a successive manner from the first channel to the fourth channel are used At this time, by reproducing data of the first channel corresponding to the audio sector SI from the disk innermost circumference up to the outermost circumference thereafter to return to the disk innermost circumference for a second time to reproduce in turn data of the second channel corresponding to the audio sector S2 up to the outermost circumference to reproduce data of the third channel corresponding to the next audio sector S3 from the disk innermost circumference to the outermost circumference for a second time to finally reproduce data of the fourth channel corresponding to the remaining audio sector 84 from the disk innermost circumference up to the outer circumference for z second time, continuous reproduction of a quadruple time will be carried out
However, in a continuous reproduction as described above, several times of track jump operations of a long distance returning from the outermost circumference to the inner circumference are required Since such track jump operations cannot be momentarily carried out, there is the serious problem that reproduced data for that time is lost, so a reproduced sound is interrupted Further, in order to attempt to record successive audio signals, it is impossible to record, e g , a signal of the sector S2 alone by the relation of the interleaving
processing at the time of recording For this reason, interleaving processing of data of adjacent sectors SI and S3, or interleaving processing of data of the peripheral sectors in addition thereto is required As a result, it is necessary to rewrite signals in sectors already recorded Accordingly, recording of such successive compressed audio data is very diff1 cult
OBJECTS & SUMMARY OF THE INVENTION
With such actual circumstances in view, this invention has been made and its object is to permit recording/reproduction of recording data having a data structure in which an extremely long convoluted interleaving processing is implemented
Another object pf this invention is to Drovlop a dick recording/reproducing apparatus adapted so that a recording area for addition data is ensured in a reproduction or playback only area or a reproduction or playback disk where recording data of the same data structure of the above-mentioned recording data are recorded, thereby making it possible to reproduce addition data along with recording data
A further object of this invention is to provide a reproduction or playback only disk having a recording area for addition data broader than that of a recordi ng/reproduci ng disk
A still further object of this invention is to provide a disk including a recording/reproducing region where
recording/reproduction of recording data of a data structure in which an extremely long convoluted interleaving processing is impelemented is carried out, and a recording area where recording data of the same data structure as that of the recording/reproducing area is recorded along with addition data
To achieve the above-mentioned objections, in accordance with this invention there is provided a disc recording/reproducing apparatus comprising
memory means into which successively inputted data m a digital form are sequentially written and from which the written inputted data are sequentially read out as recording data having a transfer rate higher than a transfer rate of the inputted data,
recording /reproducing means connected to said memory means said recording/reproducing means for reading out recording data from said memory means and dividing said recording data into clusters (C^) and to implement interleaving as described herein and to reproduce said recorded data,
reproducing means connected to said recording/reproducing means, said reproducing means for reproducing recorded data and additional data, and
further memory means connected to said reproducing means, said further memory means also being connected to said recording/reproducing means, reproduced data from said recording/reproducing means or said reproducing means are written m said further memory means and from which further memory means the writeen reproduced data are sequentially read out as successive reproduced data
A reproduction or playback only disk according to this invention is adapted so that recording data is divided into clusters every a fixed number of sectors, that cluster connection sectors longer than an interleaving length in the interleaving processing are provided at connection portions of respective clusters, that recording data to which interleaving processing is implemented are recorded every cluster and that addition data r fp rpcorded in advance in the cluster ronnertion sectors This reproduction or playback only disk may be reproduced by the above-mentioned dtSk ,