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DESCRIPTION
RECEPTION APPARATUS, RECEPTION METHOD, PROGRAM, AND
RECEPTION SYSTEM
5 TECHNICAL FIELD
[0001]
The present technique particularly relates to a
reception apparatus, a reception method, a program, and a
reception system capable of starting decoding of data in
10 a short time.
BACKGROUND ART
[0002]
[DVB-C2]
15 There is a DVB-C2 as the European second-generation
cable digital broadcasting standard (Non-Patent Document
1) . In DVB-C2, a frame called C2 frame is defined, and
data are transmitted in units of C2 frames.
[0003]
20 Fig. 1 is a figure illustrating a frame structure
of C2 frame. The horizontal direction of Fig. 1 denotes
a time.
[0004]
A C2 frame includes one to eight Preamble Symbols
25 which are OFDM (Orthogonal Frequency Division
Multiplexing) symbols and a predetermined number of Data
Symbols. The Preamble Symbols are arranged at the front
of the C2 frame, and Data Symbols are arranged after the
Preamble Symbols.
30 [0005]
The Preamble Symbol is a symbol used to transmit
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transmission control information called LI signalling
part 2 data (LI information). The Data Symbol is a
symbol used to transmit TS (Transport Stream) and the
like such as program data. The Data Symbols are divided
5 for each Data Slice.
[0006]
The reception processing in the receiver is done to
receive a signal in a Tuning Window having a fixed band
width of 3408 carriers. The central position (central
10 frequency) of the Tuning Window suitable for reception of
the signal of the desired Data Slice is designated by the
transmission side by the LI information.
[0007]
The receiver performs demodulation processing
15 including processing such as quadrature demodulation and
equalization of the received OFDM signal, and performs
decoding processing such as LDPC decoding and BCH
decoding on the signal obtained by the demodulation
processing. On the basis of the LI information obtained
2 0 by the decoding processing, the data transmitted with the
Data Symbols are decoded. For example, after the OFDM
demodulation, the data transmitted with the Data Symbols
are de-interleaved, but the pattern of de-interleaving is
difference in accordance with the information included in
25 the LI information.
[0008]
As described above, in order to decode the data
transmitted with the Data Symbols, it is necessary to
decode and obtain the Ll information transmitted with the
30 Preamble Symbols before decoding the data transmitted
with the Data Symbols. Hereinafter, the data transmitted
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with the Data Symbols will be referred to as main line
data as necessary.
CITATION LIST
5 NON-PATENT DOCUMENT
[0009]
Non-Patent Document 1: DVB-C2 specification [Digital
Video Broadcasting (DVB); Frame structure channel coding
and modulation for a second generation digital
10 transmission system for cable systems (DVB-C2)] DVB
Document A138
Non-Patent Document 2: DVB-C2 implementation guidelines
[Digital Video Broadcasting (DVB); Implementation
Guidelines for a second generation digital cable
15 transmission system (DVB-C2)] ETSI TS 102 991 vl.1.2
SUMMARY OF THE INVENTION
PROBLEMS TO BE SOLVED BY THE INVENTION
[0010]
20 [Decoding sequence]
Fig. 2 is a figure illustrating an example of a
sequence up to start of decoding of main line data. The
horizontal direction of Fig. 2 denotes a time.
[0011]
25 As illustrated in Fig. 2, the Preamble Symbols are
demodulated in accordance with its order, and the
demodulation of the final Preamble Symbol is finished,
decoding of the LI information obtained by demodulation
is started. Even between the start of decoding and the
30 end of decoding of the LI information, the demodulation
unit performing the demodulation processing outputs main
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line data obtained by the demodulation of the Data
Symbols to the decoding unit performing the decoding
processing.
[0012]
5 As described above, the LI information is required
for the decoding of the main line data transmitted with
the Data Symbols. The main line data that are output
from the demodulation unit between the start of decoding
and the end of decoding of the LI information cannot be
10 decoded by the decoding unit.
[0013]
For this reason, according to a method described in
the DVB-C2 implementation guidelines, it is necessary to
wait to decode the main line data until obtaining the
15 Data Symbols of the C2 frame subsequent to the C2 frame
used for obtaining the LI information (Non-Patent
Document 2). As illustrated in Fig. 3, when the Ll
information is obtained from the first C2 frame, the
decoding can be started from the main line data
20 transmitted with the first Data Symbols as illustrated
with shading as soon as the first Data Symbol in the
second frame is obtained.
[0014]
However, according to this method, there is a delay
25 equivalent to a C2 frame period from when the decoding of
the Ll information is finished to when the decoding of
the main line data is started.
[0015]
The Ll information is not fixed and may be changed,
30 but according to this method, what can be decoded using
new Ll information is the main line data transmitted with
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the Data Symbols in the subsequent C2 frame, and
therefore, it is impossible to seamlessly follow the
change of the LI information. When the not-yet-changed
LI information is already obtained from the predetermined
5 C2 frame, and the LI information is changed in the
current C2 frame, then the decoding of the main line data
transmitted with the Data Symbols in the current C2 frame
is done on the basis of the not-yet-changed LI
information.
10 [0016]
The present technique is made in view of such
circumstances, and is to quickly start decoding of data.
SOLUTIONS TO PROBLEMS
15 [0017]
A reception apparatus according to an aspect of the
present technique includes a demodulation unit configured
to demodulate a modulated signal used to transmit
transmission control information about data and the data
20 to be transmitted, a first decoding unit configured to
decode the transmission control information obtained by
demodulation performed with the demodulation unit, a
storage unit configured to store the data obtained by
demodulation performed with the demodulation unit, and a
25 second decoding unit configured to decode the data stored
in the storage unit on the basis of the transmission
control information decoded by the first decoding unit.
[0018]
The reception apparatus may be an IC chip, a
30 component including an IC chip, or an apparatus
constituted by a component including an IC chip. The
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storage unit may be a volatile storage unit or a nonvolatile
storage unit.
[0019]
The modulated signal may include a signal used for
5 transmitting the transmission control information and a
signal used for transmitting the data, which are arranged
in an order of transmission. In this case, the storage
unit can store the data obtained while the transmission
control information is being decoded.
10 [0020]
When the first decoding unit finishes decoding of
the transmission control information, the second decoding
unit can start decoding the data.
[0021]
15 The modulated signal is an OFDM signal of DVB-C2,
the transmission control information is LI information
transmitted with a Preamble Symbol, and the data are data
transmitted with a Data Symbol.
[0022]
2 0 According to an aspect of the present technique, a
modulated signal used to transmit transmission control
information about data and the data to be transmitted are
demodulated, and the transmission control information
obtained by demodulation is decoded. The data obtained
25 by demodulation are stored, and the stored data are
decoded on the basis of the transmission control
information decoded.
EFFECTS OF THE INVENTION
30 [0023]
According to the present technique, the decoding of
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the data can be started quickly.
BRIEF DESCRIPTION OF DRAWINGS
[0024]
5 Fig. 1 is a figure illustrating a frame structure
of C2 frame.
Fig. 2 is a figure illustrating a sequence for
starting decoding of the main line data.
Fig. 3 is another figure illustrating a sequence
10 for starting decoding of the main line data.
Fig. 4 is a figure illustrating an example of a
decoding sequence of a reception apparatus according to
an embodiment of the present technique.
Fig. 5 is a figure illustrating change of the LI
15 information.
Fig. 6 is a block diagram illustrating an example
of configuration of a reception apparatus.
Fig. 7 is a figure illustrating parameters of LI
information.
20 Fig. 8 is a block diagram illustrating an example
of configuration of a main line decoding unit.
Fig. 9 is a figure illustrating an example of
extraction of Data Slice.
Fig. 10 is a flowchart for explaining operation of
25 the reception apparatus.
Fig. 11 is a block diagram illustrating an example
of configuration of a reception system.
Fig. 12 is a block diagram illustrating an example
of configuration of hardware of a computer.
30
MODE FOR CARRYING OUT THE INVENTION
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[0025]
Hereinafter, en embodiment for carrying out the
present technique will be explained. It should be noted
that the explanation will be made in the following order.
5 1. Decoding sequence
2. Configuration and operation of reception apparatus
3. Modification
[0026]

10 Fig. 4 is a figure illustrating an example of a
decoding sequence of a reception apparatus according to
an embodiment of the present technique. The horizontal
direction of Fig. 4 denotes a time.
[0027]
15 In the reception apparatus, as illustrated in Fig.
4. the Preamble Symbols are demodulated in accordance
with its order, and the demodulation of the final
Preamble Symbol is finished, decoding of the LI
information is started. A C2 frame includes one to eight
20 Preamble Symbols and a predetermined number of Data
Symbols, which are arranged in the order of transmission.
[0028]
In parallel with decoding of the LI information,
writing of the main line data, which are obtained by
25 demodulating the first Data Symbol subsequent to the
Preamble Symbol, to the buffer is started. Writing of
the main line data to the buffer is continued until
writing of the main line data, which are obtained by
demodulating the final Data Symbol in the C2 frame is
30 finished.
[0029]
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When the decoding of the LI information is finished,
the decoding is performed as follows in parallel with
writing of the main line data obtained by demodulating
the Data Symbol into the buffer, the main line data
5 written in the buffer are read in such an order that data
written first are read first, and the decoding is
performed on the basis of the LI information which has
been decoded. The buffer provided in the reception
apparatus is an FIFO (First In First Out) type memory.
10 [0030]
Reading and decoding of the main line data from the
buffer is continued until decoding of the main line data,
which are obtained by demodulating the final Data Symbol
in the C2 frame written to the buffer is finished.
15 [0031]
As described above, in the reception apparatus, the
main line data which are output from the demodulation
unit as a result of demodulation are held in a so-called
waiting state in the buffer until the decoding of the LI
20 information is finished, and when the decoding of the LI
information is finished, the main line data are decoded
in order.
[0032]
Accordingly, the reception apparatus does not lose
25 the main line data, and can start decoding of the main
line data transmitted with the first Data Symbol included
in the same C2 frame as the C2 frame used for obtaining
the LI information. It is not necessary for the Data
Symbol of the C2 frame subsequent to the C2 frame used
30 for obtaining the LI information, and therefore, the
decoding of the main line data can be started quickly.
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[0033]
In addition, the reception apparatus can seamlessly
follow the change of the LI information. As illustrated
in Fig. 5, a case where the LI information is changed in
5 the current C2 frame will be considered. Suppose that
the not-yet-changed LI information has already been
obtained from the C2 frame before the current C2 frame,
and the decoding of the main line data of the C2 frame
immediately before is done on the basis of the not-yet-
10 changed Ll information.
[0034]
The Ll information transmitted with the Preamble
Symbols in a certain C2 frame is applied to the main line
data transmitted with the Data Symbols in the same C2
15 frame. The main line data to which the changed Ll
information is applied is main line data transmitted with
the Data Symbols in the C2 frame of Fig. 5. In the
example of Fig. 5, the band width of a desired Data Slice
is a width Wl in the Ll information which is before the
2 0 current C2 frame by one C2 frame (before the change), but
it is a width W2 in the Ll information of the current C2
frame.
[0035]
By storing the main line data to the buffer until
25 the decoding of the Ll information is finished, and
therefore, the reception apparatus uses the changed Ll
information to start decoding of the main line data
transmitted with the Data Symbols in the current C2 frame
stored in the buffer. The changed Ll information can be
30 applied to the main line data transmitted with the Data
Symbols in the current C2 frame and the main line data
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subsequent thereto, and it is possible to seamlessly
follow the change of the LI information.
[0036]
When the Data Symbols in the subsequent C2 frame is
5 waited for as explained with reference to Fig. 3, the
changed LI information can be applied to the main line
data in the C2 frame subsequent to the current C2 frame
from which the changed LI information is obtained. In
this case, it is impossible to seamlessly follow the
10 change of the LI information.
[0037]
Configuration and operation of reception apparatus>
[Example of configuration of reception apparatus]
Fig. 6 is a block diagram illustrating an example
15 of configuration of a reception apparatus according to an
embodiment of the present technique.
[0038]
The reception apparatus 1 of Fig. 6 is an apparatus
capable of receiving an OFDM signal of DVB-C2. The
20 reception apparatus 1 performs decoding of data as
explained with reference to Fig. 4.
[0039]
The reception apparatus 1 includes an OFDM
demodulation unit 11, an LI decoding unit 12, a buffer 13,
25 and a main line decoding unit 14. The OFDM demodulation
unit 11 receives, as a received signal, an IF signal
which is obtained by applying frequency conversion to an
RF signal in the Tuning Window received by an RF tuner,
not shown.
30 [0040]
The OFDM demodulation unit 11 performs quadrature
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demodulation on the received signal (OFDM signal). The
OFDM demodulation unit 11 performs FFT calculation on a
baseband signal of time domain representing each symbol
such as Preamble Symbol and Data Symbol obtained by
5 applying the quadrature demodulation. The OFDM
demodulation unit 11 equalizes the baseband signal of the
frequency domain obtained from the FFT calculation, and
outputs the equalized signal. The OFDM demodulation unit
11 performs, as demodulation processing, quadrature
10 demodulation, FFT calculation, equalization, and the like
of the received signal.
[0041]
The Ll information obtained by the demodulation
processing for the Preamble Symbols is provided from the
15 OFDM demodulation unit 11 to the Ll decoding unit 12, and
the main line data obtained by the demodulation
processing for the Data Symbols are provided from the
OFDM demodulation unit 11 to the buffer 13.
[0042]
20 When the Ll decoding unit 12 receives the Ll
information from the OFDM demodulation unit 11, the Ll
decoding unit 12 starts decoding the Ll information. The
decoding of the Ll information is done on the basis of
BCH code and LDPC code. When the decoding of the Ll
25 information is finished, the Ll decoding unit 12 outputs
information about the Data Slice included in the Ll
information as well as the decoding finish flag to the
main line decoding unit 14.
[0043]
30 Fig. 7 is a figure illustrating parameters of Ll
information. Main parameters will be explained.
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[0044]
START_FREQUENCY in the third line denotes a
frequency serving as a start position of the C2 System.
The start position is represented by absolute frequency
5 with 0 Hz being the start point. C2_BANDWIDTH in the
fourth line denotes a band width of the C2 System.
C2_FRAME_LENGTH in the sixth line denotes the number of
Data Symbols included in the C2 Frame. NUM_DSLICE in the
eighth line denotes the number of Data Slices included in
10 the C2 Frame. Each parameter from the tenth line to the
forty fifth line is described for each Data Slice.
[0045]
DSLICE_ID in the eleventh line denotes an ID of a
Data Slice in the C2 system. DSLICE_TUNE_POS in the
15 twelfth line denotes a position (central frequency)
serving as a tuning point for receiving the Data Slice
with respect to the frequency represented by
START_FREQUENCY. DSLICE_OFFSET_LEFT in the thirteenth
line denotes a frequency at the left end of the Data
20 Slice with respect to the tuning point.
DSLICE_OFFSET_RIGHT in the fourteenth line denotes a
frequency at the right end of the Data Slice with respect
to the tuning point. DSLICE_TI_DEPTH in the fifteenth
line denotes Depth of time interleaving.
25 [0046]
Back to the explanation about Fig. 6, the buffer 13
stores the main line data provided from the OFDM
demodulation unit 11. Reading of the main line data
stored in the buffer 13 is started when decoding of the
30 LI information is finished. The buffer 13 may be a
volatile memory such as a RAM, or may be a non-volatile
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memory such as a flash memory.
[0047]
When the decoding of the LI information is finished,
and the decoding finish flag is provided from the LI
5 decoding unit 12, the main line decoding unit 14 starts
reading the main line data stored in the buffer 13. The
main line decoding unit 14 decodes the main line data
which are read from the buffer 13 on the basis of the
parameters of the LI information provided by the LI
10 decoding unit 12, and outputs the main line data obtained
as a result of the decoding to a processing unit in a
later stage such as an MPEG decoder. The decoding of the
main line data by the main line decoding unit 14 is done
on the basis of BCH code and LDPC code.
15 [0048]
Fig. 8 is a block diagram illustrating an example
of configuration of the main line decoding unit 14. The
main line decoding unit 14 includes a Data Slice
extracting unit 21, a frequency de-interleaver 22, a time
20 de-interleaver 23, and an error correction unit 24.
[0049]
Data Slice extracting unit 21 extracts a signal of
a desired Data Slice on the basis of parameters of the LI
information provided from the LI decoding unit 12.
25 [0050]
Fig. 9 is a figure illustrating an example of
extraction of Data Slice by the Data Slice extracting
unit 21. The horizontal direction of Fig. 9 denotes a
frequency. When a band width indicated with lattice-like
30 diagonal lines is defined as the band width of the
desired Data Slice, the positions Kds, min at the left
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end of the band width of the desired Data Slice are
represented by the following expression (1), and the
positions Kds, max at the right end thereof are
represented by the following expression (2). Dx denotes
5 a parameter determined by a GI (guard interval) length.
When GI interval is 1/64, Dx is 12, and when the GI
interval is 1/128, Dx is 24.
[0051]
Kds,min = (DSLICE_TUNE_POS + DSLICE_OFFSET_LEFT)*Dx
10 + START_FREQUENCY ••• (1)
Kds,max = (DSLICE_TUNE_POS +
DSLICE_OFFSET_RIGHT)*Dx + START_FREQUENCY - 1 ••• (2)
[0052]
DSLICE_TUNE_POS, DSLICE_OFFSET_LEFT,
15 DSLICE_OFFSET_RIGHT, START_FREQUENCY used for extraction
of the Data Slice are parameters of the Ll information
provided by the Ll decoding unit 12. The Data Slice
extracting unit 21 outputs data of the extracted Data
Slice to the frequency de-interleaver 22.
20 [0053]
The frequency de-interleaver 22 de-interleaves, in
the frequency direction, the data of the Data Slice
provided by the Data Slice extracting unit 21, and
outputs the data obtained by de-interleaving the data in
25 the frequency direction to the time de-interleaver 23.
[0054]
The time de-interleaver 23 de-interleaves, in the
time direction, the data of the Data Slice provided by
the frequency de-interleaver 22. The pattern of de-
30 interleaving in the time direction is designated by
DSLICE_TI_DEPTH provided by the Ll decoding unit 12. The
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time de-interleaver 23 outputs the data obtained by deinterleaving
the data in the time direction to the error
correction unit 24.
[0055]
5 The error correction unit 24 corrects error of the
data of the Data Slice provided by the time deinterleaver
23, and outputs the data of which error has
been corrected.
[0056]
10 As described above, the main line decoding unit 14
uses various kinds of parameters included in the LI
information to decode the main line data.
[0057]
[Operation of reception apparatus]
15 Now, with reference to a flowchart in Fig. 10,
operation of the reception apparatus 1 having the above
configuration will be explained.
[0058]
The processing of Fig. 10 is started when the
20 reception apparatus 1 is started and the start of
reception of the DVB-C2 signal is commanded. The
processing in each step is done as necessary in parallel
with processing in another step or before or after
processing in another step.
25 [0059]
In step SI, the OFDM demodulation unit 11 starts
demodulation of the received signal. The OFDM
demodulation unit 11 outputs the LI information obtained
by the demodulation processing for the Preamble Symbol to
30 the LI decoding unit 12.
[0060]
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In step S2, when the LI decoding unit 12 receives
data obtained from the demodulation processing for the
final Preamble Symbol, the LI decoding unit 12 starts
decoding of the LI information.
5 [0061]
In step S3, the OFDM demodulation unit 11 performs
the demodulation processing on the Data Symbol which is
received subsequent to the final Preamble Symbol, and
starts writing the main line data to the buffer 13.
10 Writing of the main line data to the buffer 13 is
continued until writing of the data obtained from the
demodulation processing for the final Data Symbol is
finished.
[0062]
15 In step S4, the Ll decoding unit 12 determines
whether the decoding of the Ll information is finished or
not, and waits until it determines that the decoding of
the Ll information is finished. When the decoding of the
Ll information is determined to be finished, the Ll
20 decoding unit 12 outputs the decoding finish flag and the
parameters of the Ll information to the main line
decoding unit 14.
[0063]
In step S5, when the main line decoding unit 14
25 receives the decoding finish flag and the Ll information
parameter from the Ll decoding unit 12, the main line
decoding unit 14 reads the main line data stored in the
buffer 13, and starts decoding of the read main line data.
Thereafter, the main line decoding unit 14 continues
30 reading of the main line data and decoding of the read
main line data are continued.
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[0064]
As a result of the above processing, the reception
apparatus 1 can quickly start decoding of the main line
data. Even when the Ll information is changed, the
5 reception apparatus 1 can seamlessly follow the change.
[0065]

When the decoding finish flag is output from the Ll
decoding unit 12, the main line data are read'from the
10 buffer 13. Alternatively, the timing of reading of the
main line data may be different as long as the main line
data can be decoded using the Ll information decoded by
the Ll decoding unit 12. For example, after a
predetermined period of time passes since the decoding
15 finish flag is provided from the Ll decoding unit 12, the
main line data may be read from the buffer 13, and the
main line data may be decoded.
[0066]
[Example of configuration of reception system]
20 Fig. 11 is a block diagram illustrating an example
of configuration of a reception system to which the
reception apparatus 1 is applied.
[0067]
The reception system 101 of Fig. 11 includes a
25 tuner 111, a demodulation unit 112, a signal processing
unit 113, and an output unit 114.
[0068]
The tuner 111 receives a signal transmitted via a
transmission path such as terrestrial digital
30 broadcasting, satellite digital broadcasting, CATV
network, and the Internet, and outputs the signals to the
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demodulation unit 112.
[0069]
The demodulation unit 112 performs transmission
path decoding processing including demodulation
5 processing and error correction processing on the signal
provided by the tuner 111, and outputs the data obtained
by the transmission path decoding processing to the
signal processing unit 113. The configuration of Fig. 6
includes the demodulation unit 112.
10 [0070]
The signal processing unit 113 performs, as
necessary, signal processing such as de-compressing
processing and de-scrambling processing on the data
obtained by the transmission path decoding processing,
15 and obtains data to be transmitted.
[0071]
The de-compressing processing by the signal
processing unit 113 is performed when a transmission side
compresses transmission target data such as images and
20 audio using a predetermined method such as MPEG. The descrambling
processing is performed when a transmission
side scrambles transmission target data. The signal
processing unit 113 outputs the transmission target data
obtained by applying the signal processing as necessary
25 to the output unit 114.
[0072]
When an image based on the data provided from the
signal processing unit 113 is displayed, the output unit
114 performs processing such as D/A conversion on the
30 data provided by the signal processing unit 113. The
output unit 114 outputs an image signal obtained by
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performing processing such as D/A conversion to a display
provided in the reception system 101 or a display
provided outside of the reception system 101, so that the
image is displayed.
5 [0073]
When the data provided from the signal processing
unit 113 are recorded to a recording medium, the output
unit 114 outputs the data provided from the signal
processing unit 113 to a recording medium provided in the
10 reception system 101 or a recording medium provided
outside of the reception system 101, so that the data are
recorded. The recording medium is constituted by a hard
disk, a flash memory, an optical disk, and the like. The
external recording medium may be not only a recording
15 medium attached externally to the reception system 101
but also a recording medium connected via a network.
[0074]
The reception system 101 having the above
configuration may be constituted by hardware such as an
20 IC (Integrated Circuit) chip or may be constituted by
components such as a board made by arranging multiple IC
chips or an independent apparatus including the
components.
[0075]
25 Each of the tuner 111, the demodulation unit 112,
the signal processing unit 113, and the output unit 114
may be constituted as an independent hardware or software
module. A combination of two or more of the tuner 111,
the demodulation unit 112, the signal processing unit 113
30 and the output unit 114 may be constituted as an
independent hardware or software module. For example,
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the tuner 111 and the demodulation unit 112 may be
constituted as a piece of hardware and the like, and the
signal processing unit 113 and the output unit 114 may be
constituted as a piece of hardware and the like.
5 [0076]
For example, the reception system 101 may be
applied to a television receiver for receiving television
broadcast as digital broadcast, a radio receiver for
receiving radio broadcast, and a recorder apparatus for
10 recording television broadcast.
[0077]
[Configuration example of computer]
A series of processing explained above may be
executed by hardware or may be executed by software.
15 When the series of processing is executed by software,
for example, programs constituting the software are
installed from a program recording medium to a computer
incorporated into dedicated hardware or a general-purpose
computer.
20 [0078]
Fig. 12 is a block diagram illustrating a
configuration example of hardware of a computer executing
the above series of processing using programs.
[0079]
25 A CPU (Central Processing Unit) 151, a ROM (Read
Only Memory) 152, and a RAM (Random Access Memory) 153
are connected to each other via a bus 154.
[0080]
The bus 154 is further connected to an input/output
30 interface 155. The input/output interface 155 is
connected to an input unit 156 made of a keyboard, a
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mouse, and the like, and an output unit 157 made of a
display, a speaker, and the like. The input/output
interface 155 is connected to a storage unit 158 made of
a hard disk, a non-volatile memory, and the like, a
5 communication unit 159 made of a network interface and
the like, and a drive 160 for driving removable medium
161.
[0081]
In the computer configured as described above, for
10 example, the CPU 151 loads the program stored in the
storage unit 158 via the input/output interface 155 and
the bus 154 to the RAM 153, and executes the program,
whereby the above series of processing is performed.
[0082]
15 For example, the program executed by the CPU 151 is
recorded to the removable medium 161, or provided via a
wired or wireless transmission medium such as a local
area network, the Internet, and digital broadcast, and
installed to the storage unit 158.
20 [0083]
The program executed by the computer may be a
program with which processing in performed in time
sequence according to the order explained in this
specification, or may be a program with which processing
25 is performed in parallel or with necessary timing, e.g.,
upon call.
[0084]
The embodiment of the present technique is not
limited to the above embodiment, and may be changed in
30 various manners as long as it is within the gist of the
present technique.
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[0085]
[Modification]
The present technique may be configured as follows.
[0086]
5 (1)
A reception apparatus including:
a demodulation unit configured to demodulate a
modulated signal used to transmit transmission control
information about data and the data to be transmitted;
10 a first decoding unit configured to decode the
transmission control information obtained by demodulation
performed with the demodulation unit;
a storage unit configured to store the data
obtained by demodulation performed with the demodulation
15 unit; and
a second decoding unit configured to decode the
data stored in the storage unit on the basis of the
transmission control information decoded by the first
decoding unit.
20 [0087]
(2)
The reception apparatus as described in (1),
wherein the modulated signal includes a signal used
for transmitting the transmission control information and
25 a signal used for transmitting the data, which are
arranged in an order of transmission, and
the storage unit stores the data obtained while the
transmission control information is being decoded.
[0088]
30 (3)
The reception apparatus as described in any one of
24
SP325610WO00
(1) to (2),
wherein when the first decoding unit finishes
decoding of the transmission control information, the
second decoding unit starts decoding the data.
5 [0089]
(4)
The reception apparatus as described in any one of
(1) to (3),
wherein the modulated signal is an OFDM signal of
10 DVB-C2,
the transmission control information is LI
information transmitted with a Preamble Symbol, and
the data are data transmitted with a Data Symbol.
[0090]
15 (5)
A reception method including:
demodulating a modulated signal used to transmit
transmission control information about data and the data
to be transmitted;
20 decoding the transmission control information
obtained by demodulation;
storing the data obtained by demodulation; and
decoding the stored data on the basis of the
transmission control information decoded.
25 [0091]
(6)
A program for causing a computer to execute:
demodulating a modulated signal used to transmit
transmission control information about data and the data
30 to be transmitted;
decoding the transmission control information
25
SP325610WO00
obtained by demodulation;
storing the data obtained by demodulation; and
decoding the stored data on the basis of the
transmission control information decoded.
5 [0092]
(7)
A reception system including:
a reception unit configured to receive a modulated
signal transmitted.via a transmission path;
10 a demodulation unit configured to perform
demodulation processing of the modulated signal received
by the reception unit;
a signal processing unit configured to perform
signal processing on data demodulated by the demodulation
15 unit to obtain data to be transmitted; and
an output unit configured to output the data, which
are to be transmitted, obtained by the signal processing
unit,
wherein the demodulation unit includes: a signal
20 demodulation unit configured to demodulate the modulated
signal used to transmit transmission control information
about the data, which are to be transmitted, and the data
to be transmitted;
a first decoding unit configured to decode the
25 transmission control information obtained by demodulation
performed with the signal demodulation unit;
a storage unit configured to store the data
obtained by demodulation performed with the signal
demodulation unit; and
30 a second decoding unit configured to decode the
data stored in the storage unit on the basis of the
26
SP325610WO00
transmission control information decoded by the first
decoding unit.
REFERENCE SIGNS LIST
5 [0093]
1 reception apparatus, 11 OFDM demodulation unit,
12 LI decoding unit, 13 buffer, 14 main line decoding
unit

27
SP325610WO00
CLAIMS
1. A reception apparatus comprising:
a demodulation unit configured to demodulate a
5 modulated signal used to transmit transmission control
information about data and the data to be transmitted;
a first decoding unit configured to decode the
transmission control information obtained by demodulation
performed with the demodulation unit;
10 a storage unit configured to store the data
obtained by demodulation performed with the demodulation
unit; and
a second decoding unit configured to decode the
data stored in the storage unit on the basis of the
15 transmission control information decoded by the first
decoding unit.
2. • The reception apparatus according to claim 1,
wherein the modulated signal includes a signal used
20 for transmitting the transmission control information and
a signal used for transmitting the data, which are
arranged in an order of transmission, and
the storage unit stores the data obtained while the
transmission control information is being decoded.
25
3. The reception apparatus according to claim 1,
wherein when the first decoding unit finishes
decoding of the transmission control information, the
second decoding unit starts decoding the data.
30
4. The reception apparatus according to claim 1,
28
SP325610WO00
wherein the modulated signal is an OFDM signal of
DVB-C2,
the transmission control information is LI
information transmitted with a Preamble Symbol, and
5 the data are data transmitted with a Data Symbol.
5. A reception method comprising:
demodulating a modulated signal used to transmit
transmission control information about data and the data
to be transmitted;
decoding the transmission control information
obtained by demodulation;
storing the data obtained by demodulation; and
decoding the stored data on the basis of the
transmission control information decoded.
6. A program for causing a computer to execute:
demodulating a modulated signal used to transmit
transmission control information about data and the data
to be transmitted;
decoding the transmission control information
obtained by demodulation;
storing the data obtained by demodulation; and
decoding the stored data on the basis of the
transmission control information decoded.
7. A reception system comprising:
a reception unit configured to receive a modulated
signal transmitted via a transmission path;
30 a demodulation unit configured to perform
demodulation processing of the modulated signal received
C
10
15
20
25
29
SP325610WO00
by the reception unit;
a signal processing unit configured to perform
signal processing on data demodulated by the demodulation
unit to obtain data to be transmitted; and
5 an output unit configured to output the data, which
are to be transmitted, obtained by the signal processing
unit,
wherein the demodulation unit includes:
a signal demodulation unit configured to demodulate
0 the modulated signal used to transmit transmission
control information about the data, which are to be
transmitted, and the data to be transmitted;
a first decoding unit configured to decode the
transmission control information obtained by demodulation
5 performed with the signal demodulation unit;
a storage unit configured to store the data
obtained by demodulation performed with the signal
demodulation unit; and
a second decoding unit configured to decode the
0 data stored in the storage unit on the basis of the
transmission control information decoded by the first j
decoding unit.