JP4287992B2 - Digital data recording / reproducing apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital data recording / reproducing apparatus and method thereof, and more particularly, to an apparatus for recording and reproducing MPEG2 (Moving Picture Experts Group Phase 2) data and a recording and reproducing method in this apparatus.
[0002]
[Prior art]
In recent years, with the digitalization of broadcasting, first-generation digital set top boxes have become popular as digital broadcasting receivers. Further, as shown in FIG. 6, the next generation digital set top box 46 is a digital data recording / reproducing apparatus having a recording means 20 as a digital recording medium and having a function of recording and reproducing a digital broadcast. Is expected to be commercialized. When recording a digital broadcast, the receiving means 12 receives the digital broadcast and selects a channel. The data of the selected channel is MPEG2-TS (Transport Stream) data 28 composed of a plurality of TS packets 34 and a plurality of programs time-division multiplexed as shown in FIG. The data separation means 14 extracts only the TS packet 34 corresponding to the program to be recorded from the MPEG2-TS data 28 and converts it into partial TS data. Then, the partial TS data is recorded in the recording means 20. The TS packet 34 has a data amount of 188 bytes and is composed of a header 30 and a data area 32 including compressed audio data and compressed video data.
[0003]
When the recorded digital broadcast is reproduced, the recorded partial TS data is sent from the recording means 20 to the data separation means 14. The data separation means 14 generates MPEG2-PES (Packetized Elementary Stream) data 40 or MPEG2-ES (Elementary Stream) data 48 from the data of the partial TS, and sends it to the data reproduction means 26. In the MPEG2-ES data 48, all compressed audio data and compressed video data are one stream data. A unit having the meaning of the MPEG2-ES data 48, for example, the MPEG2-ES data 48 for one frame of the video is the MPEG2-PES data 42, and the data area 40 includes one or a plurality of TS packets. It consists of 34 data areas 32 data. The data reproduction means 26 decodes the compressed audio data and the compressed video data and reproduces them on a television or the like.
[0004]
However, in the above-described system, the data separation unit 14 is required for recording and reproduction of digital broadcasting, and the data from the reception unit 12 or the recording unit 20 needs to be selected for input to the data separation unit 14. For this reason, recording of digital broadcasts on the recording means 20 and reproduction of data of the recording means 20 cannot be performed simultaneously.
[0005]
In order to solve the above problem, it is conceivable to use a plurality of data separation means 14. However, since the ratio of the price of the data separation means 14 to the digital set top box 46 is large, The price of the set top box 46 will be greatly increased.
[0006]
Japanese Patent Laid-Open No. 9-322148 discloses an apparatus that handles a plurality of digital data. However, it does not describe the recording of digital broadcasts and the reproduction of digital broadcasts recorded in the past. This is because the digital broadcast recording and playback uses a separation unit that separates video data and audio data, so that it is impossible to simultaneously record digital broadcasts and play back previously recorded digital broadcasts. It is clear.
[0007]
Further, Japanese Patent Application Laid-Open No. 11-205748 discloses a digital recording / reproducing apparatus using a tape as a recording medium. However, since a tape is used as the recording medium and the recording head and the reproducing head cannot be used at the same time, it is impossible to simultaneously record a digital broadcast and reproduce a digital broadcast recorded in the past.
[0008]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a digital data recording / reproducing apparatus and method capable of recording a digital broadcast and simultaneously reproducing the recorded digital broadcast.
[0009]
[Means for Solving the Problems]
The gist of the digital data recording / reproducing apparatus according to the present invention is a digital data recording / reproducing apparatus for receiving digital data and recording and reproducing the digital data, wherein a plurality of programs are time-division multiplexed, And receiving means for receiving first compressed data composed of a plurality of packets, and compressed video data and compressed audio data corresponding to a program desired by a viewer from the first compressed data received by the receiving means. The data separation means for extracting the data, the recording control means for generating the second compressed data including the compressed video data and the compressed audio data extracted by the data separation means, and the recording control means Recording means for recording the second compressed data; and the compressed video data and the pressure included in the second compressed data. And data reproducing means for performing decoding of the audio data, in that it contained, and division control means when for controlling the recording and the time of the read division to the second of said recording means compressed data.
[0010]
In the digital data recording / reproducing apparatus of the present invention described above, the receiving unit receives the first compressed data, and the data separating unit extracts the compressed audio data and the compressed video data. Based on the extracted compressed audio data and compressed video data, second compressed data is generated by the recording control means and recorded by the recording means. The second compressed data recorded by the recording means is decoded and reproduced by the data reproducing means. When the time-division control means controls the recording and reading of the second compressed data in a time-sharing manner, it seems to the viewer that the digital data recording / reproducing apparatus is simultaneously recording and reproducing.
[0011]
The gist of the digital data recording / reproducing method according to the present invention is a digital data recording / reproducing method for receiving digital data and recording and reproducing the digital data, wherein a plurality of programs are time-division multiplexed. Receiving first compressed data; extracting compressed video data and compressed audio data corresponding to a program desired by a viewer from the first compressed data; and the compressed video data and compressed audio data. Generating the second compressed data including the compressed video data and the compressed audio data extracted in the step of extracting, the step of recording the second compressed data on a recording means, and the second The compressed data is read from the recording means, decoded by the data reproducing means, and reproduced. And flop, lies in including a step of controlling in time division and the recording and reading of the second compressed data by said recording means.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a digital data recording / reproducing apparatus and method according to the present invention will be described with reference to the drawings.
[0013]
As shown in FIG. 1, a digital data recording / reproducing apparatus 10 according to the present invention includes a receiving means 12 for receiving first compressed data in which a plurality of digital broadcast programs are time-division multiplexed and are composed of a plurality of packets. And the data separation means 14 for extracting compressed video data and compressed audio data corresponding to the program desired by the viewer from the first compressed data received by the reception means 12 and the data separation means 14. Recording control means 16 for generating second compressed data including compressed video data and compressed audio data, recording means 20 for recording the second compressed data generated by the recording control means 16, and second compressed data The data reproduction means 26 for decoding the compressed video data and the compressed audio data included in the data, and the recording and reading of the second compressed data to the recording means Including a time division control means 18 for controlling in time division Shito, the.
[0014]
The first compressed data received by the receiving means 12 is MPEG2-TS data 28 composed of a plurality of TS packets 34 as shown in FIG. Data constituting the data area 32 of the TS packet 34 is compressed audio data and compressed video data. The second compressed data generated by the recording control means 16 is MPEG2-PES data 42, and the data constituting the data area 40 is one or more compressed audios constituting the data area 32 of the TS packet 34. Data and compressed video data.
[0015]
As the storage means 20 for storing the MPEG2-PES data 42, a hard disk or the like is used.
[0016]
Further, as shown in FIG. 1, the selection means 24 for selecting whether the compressed video data and the compressed audio data extracted by the data separation means 14 are transmitted to the recording control means 16 or the data reproduction means 26. including. If the compressed video data and the compressed audio data are transmitted to the recording control unit 16, the selection unit 24 does not couple the data separation unit 14 and the reproduction control unit 22 to the data reproduction unit 26 as shown in FIG. When data is transmitted to the data reproducing means 26, the data separating means 14 and the data reproducing means 26 are combined. Furthermore, a reproduction control means for reading the MPEG2-PES data 42 recorded in the recording means 20 and transmitting it to the data reproduction means 26 is included.
[0017]
The data reproducing means 26 is provided with a video data decoding unit and an audio data decoding unit in order to decode the compressed video data and the compressed audio data, respectively. The data reproduction means 26 is provided with a buffer for temporarily storing data, and the data of the MPEG2-PES data 42 in the data reproduction means 26 and the reproduction control means 22 so that the buffer does not overflow or underflow. Monitoring means for monitoring the amount may be provided.
[0018]
In the digital data recording method, the receiving means 12 receives a digital broadcast program transmitted using an MPEG2 system such as satellite, cable or terrestrial wave. As shown in FIG. 2, the received digital broadcast is composed of a plurality of TS packets 34 and is MPEG2-TS data 28 in which a plurality of programs are multiplexed. The compressed audio data and the compressed video data of the desired program are extracted from the data area 32 of the TS packet 34. At this time, the selection means 24 is controlled so that neither the data separation means 14 nor the reproduction control means 22 is coupled to the data reproduction means 26 at the time of recording, and the reproduction control means 22 is activated at the time of reproduction of the recorded data. When it is coupled to the data reproduction means 26 and the received data is directly reproduced, the data separation means 14 is controlled to be coupled to the data reproduction means 26. Therefore, the extracted compressed video data and compressed audio data are sent to the recording control means 16 when the selection means 24 does not couple the data separation means 14 and the reproduction control means 22 to the data reproduction means 26. The recording control means 16 generates MPEG2-PES data 42 having a data area 40 composed of the compressed video data and the compressed audio data. The MPEG2-PES data 42 is recorded in the recording means 20.
[0019]
When the MPEG2-PES data 42 is recorded in the recording means 20, the time relationship in the MPEG2-TS data 28 is not destroyed as shown in FIG. That is, MPEG2-PES data 42 is generated in the order received by the receiving means 12 and recorded in the recording means 20. The header 38 includes data indicating whether the video data is compressed video data or compressed audio data. This is because the compressed video data and the compressed audio data can be synchronized when the MPEG2-PES data 42 recorded in the recording means 20 is reproduced. Further, by making the MPEG2-PES data 42 into one stream data as the recording data 36, the recording means 20 capable of sequential reading can cope with a high bit rate.
[0020]
As described above, digital data is recorded in the recording means 20 by the operation of the receiving means 12, the data separating means 14 and the recording control means 16 of the digital data recording / reproducing apparatus 10.
[0021]
In the digital data reproduction method, the reproduction control means 22 is coupled to the data reproduction means 26 by the selection means 24 as shown in FIG. The reproduction control means 22 reads the MPEG2-PES data 42 recorded in the recording means 20 and transmits it to the data reproduction means 26. The reading order is read in the order recorded in the recording means 20. At this time, the header 38 indicating whether the compressed audio data or the compressed video data attached when recording is referred to and transmitted to the video data decoding unit or the audio data decoding unit of the data reproducing means 26. Further, the data amount is monitored by the monitoring unit so that the buffer of the data reproducing unit 26 does not overflow or underflow. Then, the audio decoding unit and the video decoding unit of the data reproducing unit 26 decode the compressed audio data and the compressed video data, respectively, and reproduce the data on a display device such as a television.
[0022]
In the reproduction of the recorded digital data, the reproduction control means 22 and the data reproduction means 26 act to reproduce the digital data recorded in the recording means 20.
[0023]
In order to simultaneously record and reproduce the digital data, the time-division control means 18 connects the recording control means 16 and the reproduction control means 22 with the reproduction means 22 coupled to the data reproduction means 26 by the selection means 24. It becomes possible by controlling in time division. That is, the recording and reading of the MPEG2-PES data 42 in the recording means 22 is performed in a time division manner. When this recording and reading are performed in a time-sharing manner, the viewer can use the digital data recording / reproducing apparatus 10 as if recording and reproducing at the same time by performing at high speed.
[0024]
If the program being broadcast is viewed, the selection means 24 couples the data separation means 14 to the data reproduction means 26, so that the compressed video data and the compressed audio data extracted by the data separation means 14 are The data is sequentially sent to the data reproducing means 26. Then, the data reproduction means 26 decodes the received compressed video data and compressed audio data in the order received, and reproduces them on a device such as a television.
[0025]
If the digital data recording / reproducing apparatus 10 of the present invention is used, the MPEG2-PES data 42 is recorded and read in the recording means 22 in a time-sharing manner as described above, and simultaneously recorded and reproduced for the viewer. So that the digital broadcast program that started at a certain time can be recorded and viewed from the beginning of the program while it is being broadcast. In other words, with the conventional digital data recording / reproducing apparatus 46, it was not possible to reproduce from the beginning until all the digital broadcast programs were recorded. It is possible to play from the beginning while broadcasting while recording.
[0026]
Although one embodiment of the digital data recording / reproducing apparatus and method according to the present invention has been described above, the present invention is not limited to this embodiment. As another embodiment, as shown in FIG. 4, it is possible not to use the selection means. Since the selecting means is not used, all the compressed video data and compressed audio data extracted from the MPEG2-TS data 28 by the data separating means 14 are sent to the recording control means 16. If recording is performed after the MPEG2-PES data 42 is generated by the recording control means 16, the recording means 20 records it. If it is to be reproduced immediately, it is transmitted to the reproduction control means 22. The reproduction control unit 22 transmits the MPEG2-PES data 42 received from the recording control unit 16 to the data reproduction unit 26. The data reproducing means 26 decodes the MPEG2-PES data 42 and reproduces it on a television or the like. If the MPEG2-PES data 42 recorded in the recording means 20 is to be reproduced, the reproduction control means 22 transmits the MPEG2-PES data 42 recorded in the recording means 20 to the data reproduction means 26. The data reproducing means 26 decodes the MPEG2-PES data 42 and reproduces it on a television or the like.
[0027]
In addition, a method of simultaneously performing recording and reproduction is possible by controlling the recording control means 16 and the reproduction control means 22 by time division control means 18 in a time division manner as in the above-described embodiment.
[0028]
In still another embodiment, if all the digital broadcast programs desired by the viewer are stored in the storage means 20 and displayed immediately on the display device, a digital data recording / reproducing device 45 as shown in FIG. 5 is used. The recording control means 16 and the reproduction control means 22 can be time-division controlled by the time-division control means 18 so that the recorded data is immediately read out, decoded by the data reproduction means 26, and displayed on the television.
[0029]
The recording means 20 may not be built in the digital data recording / reproducing apparatus 10, 44, 45 but may be connected to the outside. In the above embodiment, a hard disk is used as the recording means 20, but a large-capacity memory module can also be used.
[0030]
Furthermore, since the capacity of the recording means 20 is limited, it is possible to delete the data recorded in the recording means 20 as well as recording data in the recording means 20. Before deleting the data recorded in the recording means 20, it is possible to re-record the data on another recording medium.
[0031]
In addition, the present invention can be implemented in a mode in which various improvements, modifications, and variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Moreover, you may implement with the form which substituted any invention specific matter to the other technique within the range which the same effect | action or effect produces. Furthermore, the invention specific matter constituted integrally may be constituted by a plurality of members, or the specific matter constituted by a plurality of members may be implemented in an integrated manner.
[0032]
【The invention's effect】
Since the digital data recording / reproducing apparatus according to the present invention generates MPEG2-PES data by the recording control means, it is not necessary to transmit the MPEG2-PES data recorded in the recording means to the data separation means. Furthermore, since the hard disk as the recording means can be controlled in a time division manner, the time division control means can control the recording control means and the reproduction control means in a time division manner so that recording and reproduction can be performed simultaneously. . In other words, with the conventional digital data recording / reproducing apparatus, the digital broadcast program cannot be reproduced from the beginning until all the digital broadcast programs have been recorded. In the present invention, the digital broadcast program being broadcast is recorded. However, it is possible to play from the beginning during the broadcast.
[0033]
In the digital data recording / reproducing method according to the present invention, the received MPEG2-TS data is not recorded in the recording means as it is, but the MPEG2-PES data is generated and recorded from the MPEG2-TS data. There is no need to extract the compressed video data and compressed audio data required by the data separation means when performing reproduction.
[Brief description of the drawings]
FIG. 1 is a block diagram of a digital data recording / reproducing apparatus of the present invention when recording received digital data.
FIG. 2 is a diagram when MPEG2-PES data and recording data are generated from MPEG2-TS data.
FIG. 3 is a block diagram of a digital data recording / reproducing apparatus according to the present invention, in which data recorded on the recording means is reproduced or data is recorded on the recording means and recorded data are simultaneously reproduced. is there.
FIG. 4 is a block diagram of a digital data recording / reproducing apparatus in another embodiment of the present invention.
FIG. 5 is a block diagram of a digital data recording / reproducing apparatus in another embodiment of the present invention.
FIG. 6 is a block diagram of a conventional digital data recording / reproducing apparatus.
FIG. 7 is a diagram showing the relationship between various data formats.
[Explanation of symbols]
10, 44, 45: Digital data recording / reproducing device 12: Receiving means 14: Data separating means 16: Recording control means 18: Time division control means 20: Recording means 22: Reproduction control means 24: Selection means 26: Data reproduction means 28: MPEG2-TS data (first compressed data)
30, 38: Header 32, 40: Data area 34: TS packet 36: Recording data 42: MPEG2-PES data (second compressed data)
46: Digital set top box 48: MPEG2-ES data

Claims (11)

A digital data recording / reproducing apparatus for receiving digital data and recording and reproducing the digital data,
Receiving means for receiving a first compressed data in which a plurality of programs are time-division multiplexed and configured by a plurality of packets;
Data separation means for extracting compressed video data and compressed audio data corresponding to a program desired by a viewer from the first compressed data received by the receiving means;
Recording control means for generating second compressed data including the compressed video data and compressed audio data extracted by the data separating means;
Recording means for recording the second compressed data generated by the recording control means, reproduction control means for reading out the second compressed data recorded in the recording means, and transmitting it to the data reproducing means;
Data reproducing means for decoding the compressed video data and compressed audio data included in the second compressed data;
Time-division control means for controlling time-division recording and reading of the second compressed data by controlling the recording control means and the reproduction control means in a time-division manner;
When only recording the first compressed data received by the receiving means to the recording means, it is controlled so that neither the data separation means nor the reproduction control means is coupled to the data reproduction means, When reproducing the second compressed data recorded in the recording means, when the reproduction control means is coupled to the data reproducing means and the first compressed data received by the receiving means is directly reproduced, look including a selection means is controlled to couple said data separating means to said data reproducing means,
When the time-division control means performs the recording of the first compressed data and the reproduction of the second compressed data at the same time, with the reproduction control means coupled to the data reproduction means by the selection means, Controlling the recording control means and the reproduction control means in a time-sharing manner;
A digital data recording / reproducing apparatus.   2. The digital data recording / reproducing apparatus according to claim 1, wherein the first compressed data is MPEG2-TS data, and the second compressed data is MPEG2-PES data.   3. The digital data recording / reproducing apparatus according to claim 2, wherein the plurality of MPEG2-PES data recorded in the recording means are recorded as one stream data.   2. The digital data recording / reproducing apparatus according to claim 1, further comprising monitoring means for monitoring a data amount of the second compressed data processed by the data reproducing means and the reproduction control means.   5. The digital data recording / reproducing apparatus according to claim 1, further comprising a video data decoding unit and an audio data decoding unit for decoding the compressed video data and the compressed audio data, respectively, in the data reproducing unit.   6. The digital data recording / reproducing apparatus according to claim 1, wherein the recording means is a hard disk. A digital data recording / reproducing method for receiving digital data and recording and reproducing the digital data,
Receiving means for receiving first compressed data in which a plurality of programs are time-division multiplexed;
Data separation means for extracting compressed video data and compressed audio data corresponding to a program desired by a viewer from the first compressed data;
Generating a second compressed data including the compressed video data and the compressed audio data extracted by the recording control means extracting the compressed video data and the compressed audio data;
The recording control means recording the second compressed data in the recording means;
A step of reading out the second compressed data from the recording unit, decoding the second compressed data read out by the data reproducing unit, and playing back the second compressed data;
Time-division control means controlling the recording control means and the reproduction control means in a time-sharing manner to control recording and reading of the second compressed data in the recording means in a time-sharing manner; Including
When the selection means only records the first compressed data received by the receiving means on the recording means after the step of extracting the compressed video data and compressed audio data, the data separating means and the Control is performed so that none of the reproduction control means is coupled to the data reproduction means, and when reproducing the second compressed data recorded in the recording means, the reproduction control means is coupled to the data reproduction means. is controlled, in the case of reproducing the first compressed data received by said receiving means directly further seen including a step which is controlled to couple said data separating means to said data reproducing means,
In the time-division control step, when the recording of the first compressed data and the reproduction of the second compressed data are performed simultaneously, the reproduction control means is coupled to the data reproduction means by the selection means. The step of controlling the recording control means and the reproduction control means in a time-sharing manner;
Digital data recording / reproducing method.   8. The digital data recording / reproducing method according to claim 7, wherein the first compression format is MPEG2-TS data and the second compression format is MPEG2-PES data.   9. The digital data recording / reproducing method according to claim 8, wherein when the MPEG2-PES data is recorded on the recording means, a plurality of the MPEG2-PES data is recorded as one stream data.   When recording the plurality of MPEG2-PES data as a single stream data, the compressed video data and the compressed audio data in the MPEG2-TS data are recorded in the order received by the receiving means. The digital data recording / reproducing method according to claim 9.   Data of the second compressed data processed in the step of the reproduction control means reading the second compressed data from the recording means, decoding the second compressed data read by the data reproducing means, and performing the reproduction 11. The digital data recording / reproducing method according to claim 8, further comprising the step of monitoring the quantity by a monitoring means.

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