JP3248351B2 - Digital data recording / reproducing apparatus and digital data recording / reproducing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital data of a compressed television signal, which receives and records a television signal compressed by high-efficiency coding, and outputs a compressed television signal reproduced and output during reproduction to a decoder. And a device for recording and reproducing the same.

[0002]

2. Description of the Related Art High-efficiency coding methods such as inter-picture coding,
For example, when recording a television signal compressed by an external device using a conventional digital VTR according to the so-called MPEG2 encoding system, which is recommended as an international standard as ISO-13818, the input data is A method has been devised for recording and reproducing data without compression. In order to cope with special reproduction, a method has been devised in which auxiliary data for special reproduction is generated from input data and multiplexed with input data for recording.

FIG. 9 shows a configuration of a conventional digital VTR. Hereinafter, components having the same number have the same configuration and function. 9, reference numeral 1 denotes a special reproduction data generation circuit, 4 denotes a recording signal processing circuit, 5 denotes a recording circuit, and 6 denotes a recording circuit.
Is a recording head, 7 is a recording medium, here a magnetic tape, 8
Is a reproduction head, 9 is a reproduction circuit, 10 is a reproduction packet selection circuit, 11 is a normal reproduction data processing circuit, 12 is a special reproduction data processing circuit, and 13 is a switch.

The input image signal data is generated by a special reproduction data generation circuit 2 using only low-frequency components of the input data to generate special reproduction data, and a recording signal processing circuit 4 generates the input data and the special reproduction data. Are divided into recording packet sizes, are arranged on a tape in such a manner as to be recorded in a predetermined arrangement, and are processed by a recording circuit 5 for error correction encoding and modulation. Will be recorded.

At the time of reproduction, a reproduction circuit 9 performs processing such as demodulation and error correction decoding of data read from the magnetic tape 7 by the reproduction head 8. At the time of normal reproduction, the reproduction packet selection circuit 10 selects a recording packet in which the input data is recorded, and sends it to the normal reproduction data processing circuit 11. At the time of special reproduction, a recording packet in which special reproduction data is recorded is selected and sent to the special reproduction data processing circuit 12. In the normal reproduction data processing circuit 11, the data array is returned to the same data array as at the time of input, and the format of the original input data is restored after removing the delimiter of the recording packet. Special reproduction data processing circuit 11
Then, the data array is returned to the same data array as at the time of generation, additional information such as delimiter information of a recording packet is removed, auxiliary information such as a necessary header is added, and the data format accepted by the external decoder is restored. The switch 13 selects and outputs data for normal reproduction or data for special reproduction.

[0006]

However, the above conventional configuration has the following problems.

When the input data is data compressed by inter-picture coding such as ISO-13818, it has the following problems.

First, in a transmission packet of an MPEG2 signal, a PCR (Program Clock Reference) for synchronizing with an operation clock at the time of encoding by an external decoder receiving the MPEG2 signal is used.
RTS) and a DTS (Decoding Time Stamp) for synchronizing the decoding of the image signal and the audio signal, and a PTS (Presentation Time Stamp) for synchronizing the displaying of the decoded image signal and the audio signal. However, when these signals have different speeds at the time of recording and playback, the transmission timing is different from the actual, and the decoder cannot perform the decoding and displaying operation correctly. Have. For example, if the reproduction speed is three times, the transmission timing of the synchronous reference signal is three times normal, and if it is １ ／, the transmission timing is と な り normal, and the buffer of the decoder overflows or underflows. In the case of reverse reproduction such as -1 or -3 times, the synchronous reference signal is updated in the normal reverse direction, and data is read in the reverse order. Therefore, if the data is output in the same data order, the decoder correctly decodes the data. I can't.

When the reproduction speed changes during reproduction, no synchronous data is output because no reproduced data is output, and the synchronous reference signal cannot be correctly transmitted to the decoder.

An object of the present invention is to solve such problems of the conventional recording / reproducing apparatus.

[0011]

In order to achieve this object, in a digital data recording / reproducing apparatus according to a first aspect of the present invention, a recording system generates an auxiliary data packet by using a part or all of an input digital data packet. Means for generating
A recording signal processing unit configured to perform predetermined recording signal processing on the auxiliary data packet and the input digital data packet to generate a recording packet; and a recording unit recording the recording packet on the recording medium. A reproducing means for obtaining reproduction data from a recording medium; a data reconstructing means for reconstructing the input data packet from the reproduced data during normal reproduction, and reconstructing the auxiliary data packet during special reproduction; Synchronous reference signal detecting means for detecting the presence or absence and position of a synchronous reference signal in the auxiliary data packet, and rewriting the detected synchronous reference signal in the auxiliary data packet so as to be correctly synchronized with the current special reproduction speed. A synchronous reference signal rewriting means for transmitting the reconstructed input data packet during normal reproduction; At the time of reproduction and an outputting means for outputting the auxiliary data packet to the outside.

According to a second aspect of the present invention, in the digital data recording / reproducing apparatus, the recording system is configured to generate an auxiliary data packet using a part or the whole of the input digital data packet, and to generate synchronization data in the auxiliary data packet. A synchronous reference signal detecting means for detecting the presence or absence and a position of a reference signal; a synchronous reference signal removing means for removing a synchronous reference signal in the detected auxiliary data packet; and a predetermined signal for the auxiliary data packet and the input digital data packet. A recording signal processing unit that performs recording signal processing to generate a recording packet, and a recording unit that records the recording packet on the recording medium, wherein a reproducing system obtains reproduction data from the recording medium; At the time of reproduction, the input data packet is reconstructed from the reproduction data. Data reconstructing means for reconstructing a packet, synchronous reference signal adding means for generating and adding a synchronous reference signal so that the auxiliary data packet can be correctly synchronized with the current trick play speed during trick play, At the time of reproduction, the reconstructed input data packet is
Output means for outputting the auxiliary data packet to the outside during trick play.

Further, in the digital data recording / reproducing apparatus according to a third aspect of the present invention, the recording system includes: a generating means for generating an auxiliary data packet using a part or all of the input digital data packet; A synchronous reference signal detecting means for detecting the presence / absence and position of a reference signal; a synchronous reference signal rewriting means for rewriting a synchronous reference signal in the detected auxiliary data packet; and a predetermined signal for the auxiliary data packet and the input digital data packet. A recording signal processing unit that performs recording signal processing to generate a recording packet, and a recording unit that records the recording packet on the recording medium, wherein a reproducing system obtains reproduction data from the recording medium; During playback, the input data packet is reconstructed from the playback data. A data reconstruction means for reconstructing the Tapaketto, during normal reproducing input data packet the reconstructed, during special playback and an outputting means for outputting the auxiliary data packets to the outside.

Further, the digital data recording / reproducing apparatus according to a fourth aspect of the present invention generates a packet having a synchronization reference signal so as to be properly synchronized when reproduction data is not obtained from the recording medium when the reproduction speed is changed. And a synchronous packet generating means.

In a digital data recording / reproducing apparatus according to a fifth aspect of the present invention, the recording system generates auxiliary screen data by using a part or all of the data of the portion of the input data coded by the intra-screen coding. Auxiliary screen data generating means, auxiliary screen delimiter information generating means for generating auxiliary screen delimiter information that is information indicating the delimitation of each of the auxiliary screen data, the input data, each of the auxiliary screen data, and the auxiliary screen delimiter information And a recording signal processing means for performing a predetermined recording signal processing on the recording medium to generate a recording packet, and a recording means for recording the recording packet on the recording medium, wherein the reproduction system obtains reproduction data from the recording medium. Reproducing means for reconstructing the input data from the reproduced data during normal reproduction, and the auxiliary image obtained from the reproduced data during special reproduction. Data reconstruction means for reconstructing each of the auxiliary screen data according to delimiter information, and output means for outputting the reconstructed input data during normal reproduction and the auxiliary screen data during special reproduction. And

According to a sixth aspect of the present invention, in the digital data recording / reproducing apparatus, the recording system generates auxiliary screen data by using a part or all of the data of a portion of the input data which is encoded by the intra-screen encoding. Auxiliary header data generating means for generating, and a common header signal generating means for generating and arranging a common header signal which is a signal required in common for decoding of each auxiliary screen data at a break position of each auxiliary screen data, Recording signal processing means for performing predetermined recording signal processing on the input data, the auxiliary screen data packet, and the common header signal generating means to generate a recording packet, and recording means for recording the recording packet on the recording medium. Having a reproducing system, reproducing means for obtaining reproduction data from the recording medium, and reconstructing the input data from the reproduction data during normal reproduction, A data reconstructing means for reconstructing the auxiliary screen data together with the previously reproduced common header signal at the time of special reproduction, outputting the reconstructed input data at the time of normal reproduction, and outputting the auxiliary data at the time of special reproduction Output means for performing the operation.

[0017]

According to the first aspect of the present invention, special reproduction using the auxiliary data can be performed at an arbitrary reproduction speed at which the auxiliary data can be reproduced by rewriting the synchronous reference signal of the auxiliary data at the time of reproduction.

According to the second aspect of the present invention, the auxiliary data synchronous reference signal is removed at the time of recording and a packet including the auxiliary data synchronous reference signal is added at the time of reproduction, thereby enabling reproduction of the auxiliary data. Special reproduction using the auxiliary data at the reproduction speed becomes possible.

According to a third aspect of the present invention, a special reproduction using the auxiliary data without rewriting the synchronous reference signal at the time of reproduction at a specific reproduction speed by rewriting the synchronous reference signal of the auxiliary data at the time of recording with the above configuration. Becomes possible.

According to a fourth aspect of the present invention, a packet including a synchronous reference signal is generated and output when the reproduction speed changes at the time of reproduction by the above configuration, so that data is not output while the reproduction speed is changing. Can also correctly transmit the synchronization reference signal to the decoder.

According to the fifth aspect of the present invention, by recording the information indicating the break of the auxiliary screen data corresponding to each auxiliary screen at the time of recording by the above configuration, the auxiliary screen for one screen is displayed at the time of special reproduction. It will be easier to collect data.
Even in the reverse reproduction, the auxiliary screen data can be collectively collected for one screen, so that the data for one screen can be easily rearranged.

According to the sixth aspect of the present invention, a header signal common to each auxiliary screen can be recorded between auxiliary screen data corresponding to each auxiliary screen at the time of recording. This makes it easy to collect one screen of auxiliary screen data at the time of trick play, and also enables reliable decoding because a common header signal essential for decoding always precedes one screen data. Furthermore, in reverse playback, auxiliary screen data can be collected collectively for one screen, and when reading from the reverse direction, the common header signal can be read before data for one screen. Rearrangement can be easily performed and reliable decoding can be performed.

[0023]

FIG. 1 is a block diagram of a digital data recording / reproducing apparatus according to an embodiment of the first invention. Hereinafter, this embodiment will be described with reference to FIG. Hereinafter, components having the same number have the same configuration and function.

In FIG. 1, reference numeral 1 denotes a special reproduction data generating circuit, 2 denotes a synchronous reference signal detecting circuit, 3 denotes a synchronous reference signal rewriting circuit, 4 denotes a recording signal processing circuit, 5 denotes a recording circuit, and 6 denotes a recording circuit.
Is a recording head, 7 is a recording medium, here a magnetic tape, 8
Is a reproduction head, 9 is a reproduction circuit, 10 is a reproduction packet selection circuit, 11 is a normal reproduction data processing circuit, 12 is a special reproduction data processing circuit, and 13 is a switch.

First, as for the input image signal data, special reproduction data is generated by the special reproduction data generation circuit 2 using only the low frequency components of the intra-coded data of the screen among the input data. The recording signal processing circuit 4 divides the input data and the special reproduction data into recording packet sizes, arranges them so that they are recorded in a predetermined arrangement on a tape, and performs processing such as error correction coding and modulation by the recording circuit 5. After that, the data is recorded on the magnetic tape 7 by the recording head 6.

At the time of reproduction, the reproduction circuit 9 performs processing such as demodulation and error correction decoding of data read from the magnetic tape 7 by the reproduction head 8. At the time of normal reproduction, the reproduction packet selection circuit 10 selects a recording packet in which the input data is recorded, and sends it to the normal reproduction data processing circuit 11. At the time of special reproduction, a recording packet in which special reproduction data is recorded is selected and sent to the special reproduction data processing circuit 12. In the normal reproduction data processing circuit 11, the data array is returned to the same data arrangement as at the time of input, and the format of the original input data is restored by removing the delimiter of the recording packet. In the trick play data processing circuit 11, the data array is returned to the same data array as that at the time of generation, additional information such as delimiter information of a recording packet is removed, auxiliary information such as a necessary header is added, and the data format accepted by the external decoder is changed. Restore.

Here, the position of the synchronous reference signal is detected from the special reproduction data by the synchronous reference signal detecting circuit 2. The detected synchronous reference signal is rewritten by the synchronous reference signal rewriting circuit 3. This operation will be described with reference to FIG.

Some headers of MPEG2 transmission packets include any or all of the synchronous reference signals of PCR, PTS, and DTS shown in FIG. Of these, the portion indicating the time, in PCR, program_
clockreference_base 33 bits or program_clock
_reference_base 33 bits + program_clock_reference
_extension 9 bits, 3 shown by oblique lines in PTS and DTS
3 bits (3 + 15 + 15 bits) are rewritten according to the tape speed at the time of special reproduction. For example, if the reproduction speed is doubled, the time difference between each PCR is halved. The switch 13 selects and outputs data for normal reproduction or data for special reproduction.

As described above, according to the first embodiment, the special reference using the auxiliary data is performed at an arbitrary reproduction speed at which the auxiliary data can be reproduced by rewriting the synchronous reference signal of the auxiliary data at the time of reproduction. It becomes possible.

Next, a second embodiment will be described. FIG.
FIG. 3 is a block diagram of a digital data recording / reproducing apparatus for explaining a second embodiment.

In FIG. 3, 1 is a special reproduction data generating circuit, 2 is a synchronous reference signal detecting circuit, 31 is a synchronous reference signal removing circuit, 4 is a recording signal processing circuit, 5 is a recording circuit, 6 is a recording head, 7 Is a recording medium, here a magnetic tape, 8 is a reproduction head, 9 is a reproduction circuit, 10 is a reproduction packet selection circuit, 11 is a normal reproduction data processing circuit, 12 is a special reproduction data processing circuit, and 32 is a synchronous reference signal addition. Circuit, 13
Is a switch.

First, as for the input image signal data, special reproduction data is generated by the special reproduction data generation circuit 2 using only the low-frequency components of the intra-coded data of the screen among the input data. Here, the synchronous reference signal detection circuit 2
To detect the position of the synchronization reference signal from the special reproduction data. The recording signal processing circuit 4 divides the input data and the special reproduction data into recording packet sizes, arranges them so that they are recorded in a predetermined arrangement on a tape, and performs processing such as error correction coding and modulation by the recording circuit 5. After that, the data is recorded on the magnetic tape 7 by the recording head 6.

At the time of reproduction, the reproduction circuit 9 performs processes such as demodulation and error correction decoding of data read from the magnetic tape 7 by the reproduction head 8. At the time of normal reproduction, the reproduction packet selection circuit 10 selects a recording packet in which the input data is recorded, and sends it to the normal reproduction data processing circuit 11. At the time of trick play, a recording packet in which trick play data is recorded is selected and sent to the trick play data processing circuit 12. In the normal reproduction data processing circuit 11, the data array is returned to the same data arrangement as at the time of input, and the format of the original input data is restored by removing the delimiter of the recording packet. Special reproduction data processing circuit 11
Then, the data array is returned to the same data array as at the time of generation, additional information such as delimiter information of a recording packet is removed, auxiliary information such as a necessary header is added, and the data format accepted by the external decoder is restored.

Here, the synchronous reference signal adding circuit 32
Thus, a packet including a synchronization reference signal is generated and added.
This operation will be described with reference to FIG.

As shown in FIG. 4, PCR, PTS, DT
Generate a packet including S. Among these, the portion indicating the time, 13 bits indicated by oblique lines in the PCR, PTS, DT
In S, 8 bits indicated by oblique lines are generated according to the tape speed at the time of special reproduction, and are written in the packet. The switch 13 selects the data for normal reproduction or the data for special reproduction and outputs the selected data.

As described above, according to the second embodiment, the auxiliary data synchronous reference signal is removed at the time of recording and the packet containing the auxiliary data synchronous reference signal is added at the time of reproduction, whereby the auxiliary data is reproduced. Special reproduction using auxiliary data can be performed at any possible reproduction speed.

Next, a third embodiment will be described. FIG.
FIG. 9 is a block diagram of a digital data recording / reproducing apparatus for explaining a third embodiment.

In FIG. 5, 1 is a data reproduction circuit for special reproduction, 2 is a synchronous reference signal detecting circuit, 51 is a synchronous reference signal rewriting circuit, 4 is a recording signal processing circuit, 5 is a recording circuit,
6 is a recording head, 7 is a recording medium, here a magnetic tape,
Reference numeral 8 denotes a reproduction head, 9 denotes a reproduction circuit, 10 denotes a reproduction packet selection circuit, 11 denotes a normal reproduction data processing circuit, 12 denotes a special reproduction data processing circuit, and 13 denotes a switch.

First, the input image signal data is generated by the special reproduction data generation circuit 2 by using only the low frequency components of the intra-coded image data among the input data. According to the double speed made possible during the special reproduction, special reproduction data is generated for that type. Here, the position of the synchronous reference signal is detected from the special reproduction data by the synchronous reference signal detection circuit 2. further,
The synchronous reference signal rewriting circuit 52 rewrites the synchronous reference signal. The recording signal processing circuit 4 divides the input data and the special reproduction data into recording packet sizes, arranges them so that they are recorded in a predetermined arrangement on a tape, and performs processing such as error correction coding and modulation by the recording circuit 5. After that, the data is recorded on the magnetic tape 7 by the recording head 6.

At the time of reproduction, the reproduction circuit 9 performs processes such as demodulation and error correction decoding of data read from the magnetic tape 7 by the reproduction head 8. At the time of normal reproduction, the reproduction packet selection circuit 10 selects a recording packet in which the input data is recorded, and sends it to the normal reproduction data processing circuit 11. At the time of trick play, a recording packet in which trick play data is recorded is selected and sent to the trick play data processing circuit 12. In the normal reproduction data processing circuit 11, the data array is returned to the same data arrangement as at the time of input, and the format of the original input data is restored by removing the delimiter of the recording packet. Special reproduction data processing circuit 11
Then, the data array is returned to the same data array as that at the time of generation, additional information such as delimiter information of a recording packet is removed, auxiliary information such as a necessary header is added, and the data format accepted by the external decoder is restored. The switch 13 selects and outputs data for normal reproduction or data for special reproduction.

As described above, according to the third embodiment, the synchronous reference signal of the auxiliary data is rewritten at the time of recording by the above configuration, so that the synchronous reference signal is rewritten at the time of reproduction at a specific reproduction speed. Without this, the special reproduction using the auxiliary data can be performed.

Next, a fourth embodiment will be described. FIG.
FIG. 14 is a block diagram of a digital data reproducing apparatus for explaining a fourth embodiment.

In FIG. 6, 7 is a recording medium, here a magnetic tape, 8 is a reproducing head, 9 is a reproducing circuit, 10 is a reproducing packet selecting circuit, 11 is a normal reproducing data processing circuit,
Reference numeral 12 denotes a special reproduction data processing circuit, 32 denotes a synchronization reference signal adding circuit, and 13 denotes a switch.

At the time of reproduction, the same operation as on the reproduction side in the third embodiment is performed. Here, while the playback speed shifts from the normal speed to the high-speed playback or the low-speed playback, or the playback speed changes during the special playback, the synchronization reference signal cannot be generated correctly. The reference signal adding circuit 32 generates a packet including the synchronization reference signal for the subsequent time shown above. The contents of the packet are the same as those shown in FIG.

As described above, according to the fourth embodiment, when the reproduction speed changes at the time of reproduction, the packet including the synchronous reference signal is generated and output, so that the data during the reproduction speed is changed. , The synchronization reference signal can be correctly sent to the decoder.

Next, a fifth embodiment will be described. FIG.
FIG. 13 is a block diagram of a digital data recording / reproducing apparatus for explaining a fifth embodiment.

In FIG. 7, 1 is a special reproduction data generation circuit, 2 is a synchronous reference signal detection circuit, 71 is a special reproduction data screen separation information generation circuit, 4 is a recording signal processing circuit,
5 is a recording circuit, 6 is a recording head, 7 is a recording medium, here a magnetic tape, 8 is a reproducing head, 9 is a reproducing circuit, 10 is a reproducing packet selection circuit, 11 is a data processing circuit for normal reproduction, and 12 is special reproduction. The data processing circuit 13 is a switch.

First, the input image signal data is generated by the special reproduction data generation circuit 2 by using only the low-frequency components of the intra-coded image data among the input data. The trick play data delimiter information generation circuit 71 generates information indicating a break of each screen of the trick play data. The recording signal processing circuit 4 divides the input data and the special reproduction data into the size of the recording packet, and records the input data and the special reproduction data in a predetermined arrangement on the tape together with the auxiliary information including the special reproduction data separation information generated earlier. The data is recorded on a magnetic tape 7 by a recording head 6 after processing such as error correction encoding and modulation is performed by a recording circuit 5. Here, the break of each screen of the special reproduction data exists on the break of the track, that is, by arranging each track so that only the data for special reproduction of the same screen exists, it is easy to reproduce one screen at the time of reproduction. It is possible to collect data.

At the time of reproduction, the reproduction circuit 9 performs processing such as demodulation and error correction decoding of data read from the magnetic tape 7 by the reproduction head 8. At the time of normal reproduction, the reproduction packet selection circuit 10 selects a recording packet in which the input data is recorded, and sends it to the normal reproduction data processing circuit 11. At the time of special reproduction, a recording packet in which special reproduction data is recorded is selected and sent to the special reproduction data processing circuit 12. In the normal reproduction data processing circuit 11, the data array is returned to the same data arrangement as at the time of input, and the format of the original input data is restored by removing the delimiter of the recording packet. The trick play data processing circuit 11 returns the data array to the same data array as at the time of generation, removes additional information such as recording packet delimiter information, adds necessary auxiliary information such as a header, and changes the data format accepted by the external decoder. Restore. Here, by reading the special playback data delimiter information, the special playback data for one screen can be stored in the memory and output collectively.

At the time of special reproduction, reproduction can be performed without mixing screens. In particular, at the time of reverse reproduction, the data for one screen can be correctly decoded by the decoder by reading the special reproduction data for one screen stored in the memory from the reverse. The switch 13 selects and outputs data for normal reproduction or data for special reproduction.

As described above, according to the fifth embodiment, the information indicating the break of the auxiliary screen data corresponding to each auxiliary screen is recorded at the time of recording, so that one screen is recorded at the time of special reproduction. It is easy to collect minute auxiliary screen data. Also in the reverse reproduction, since the auxiliary screen data can be collectively collected for one screen, it is easy to rearrange the data for one screen in reverse.

Next, a sixth embodiment will be described. FIG.
FIG. 14 is a block diagram of a digital data recording / reproducing apparatus for explaining a sixth embodiment.

In FIG. 8, 1 is a special reproduction data generation circuit, 2 is a synchronous reference signal detection circuit, 81 is a sequence header generation circuit, 4 is a recording signal processing circuit, 5 is a recording circuit,
6 is a recording head, 7 is a recording medium, here a magnetic tape,
8 is a reproducing head, 9 is a reproducing circuit, 10 is a reproducing packet selecting circuit, 11 is a normal reproducing data processing circuit, 12 is a special reproducing data processing circuit, 82 is a sequence header reading circuit, and 13 is a switch.

First, the input image signal data is generated by the special reproduction data generation circuit 2 by using only the low-frequency components of the intra-coded image data among the input data. The trick play data delimiter information generation circuit 71 generates information indicating a break of each screen of the trick play data. The sequence header generation circuit 81 generates, from the input data, a packet including a sequence header which is a signal commonly required for decoding the high-speed reproduction data of each screen.

In the recording signal processing circuit 4, the input data and the special reproduction data are divided into recording packet sizes, and the previously generated sequence header packets are arranged so as to be recorded at the division positions of each screen of the special reproduction data. Recording circuit 5
After processing such as error correction encoding and modulation is performed on the magnetic tape 7 by the recording head 6. Here, the break of each screen of the special reproduction data exists on the break of the track, that is, by arranging each track so that only the data for special reproduction of the same screen exists, it is easy to reproduce one screen at the time of reproduction. Data can be collected.

At the time of reproduction, the reproduction circuit 9 performs processing such as demodulation and error correction decoding of data read from the magnetic tape 7 by the reproduction head 8. At the time of normal reproduction, the reproduction packet selection circuit 10 selects a recording packet in which the input data is recorded, and sends it to the normal reproduction data processing circuit 11. At the time of special reproduction, a recording packet in which special reproduction data is recorded is selected and sent to the special reproduction data processing circuit 12. In the normal reproduction data processing circuit 11, the data array is returned to the same data arrangement as at the time of input, and the format of the original input data is restored by removing the delimiter of the recording packet. The trick play data processing circuit 11 returns the data array to the same data array as at the time of generation, removes additional information such as recording packet delimiter information, adds necessary auxiliary information such as a header, and changes the data format accepted by the external decoder. Restore.

Here, the sequence header reading circuit 8
By reading out the sequence header packet in step 2, the data for special reproduction for one screen can be stored in the memory and output collectively, and the reproduction can be performed without mixing the screens during special reproduction. In addition, just before decoding each screen, the decoder outputs sequence header packets that are necessary in common for decoding each screen, so that correct auxiliary information can be obtained regardless of the position where trick play starts, and correct playback can be performed. You can do it. In particular, during reverse playback, even if the special playback data for one screen stored in the memory is read from the reverse, a sequence header packet can be obtained immediately before,
Data of one screen can be correctly decoded by the decoder. The switch 13 selects and outputs data for normal reproduction or data for special reproduction.

As described above, according to the sixth embodiment, at the time of recording, a header signal common to each auxiliary screen can be recorded between auxiliary screen data corresponding to each auxiliary screen. This makes it easy to collect one screen worth of auxiliary screen data at the time of trick play, and also enables reliable decoding because a common header signal essential for decoding always comes before one screen worth of data. Furthermore, in reverse playback, auxiliary screen data can be collected collectively for one screen, and when reading from the reverse direction, the common header signal can be read before data for one screen. Can be easily rearranged, and reliable decoding can be performed.

Although the above embodiment has been described on the assumption that the input signal is an MPEG signal, it goes without saying that this may be another inter-picture coded signal.
Further, the low-frequency portion of the portion subjected to intra-picture encoding is used as the special reproduction signal, but this may use a direct-current portion or may record all components including the wide-range portion. .

[0060]

As is apparent from the above description, the first aspect of the present invention rewrites the synchronous reference signal of the auxiliary data at the time of recording so that the synchronous reference signal is not rewritten at the time of reproduction at a specific reproduction speed. Special reproduction using auxiliary data becomes possible.

According to the second aspect of the present invention, a special reproduction using the auxiliary data can be performed at an arbitrary reproduction speed at which the auxiliary data can be reproduced by rewriting the synchronous reference signal of the auxiliary data during reproduction.

According to a third aspect of the present invention, the auxiliary reference data synchronization removal signal is removed during recording, and a packet including the auxiliary data synchronization reference signal is added during reproduction, so that the auxiliary data can be reproduced at an arbitrary reproduction speed at which the auxiliary data can be reproduced. Special reproduction using data becomes possible.

According to a fourth aspect of the present invention, a packet including a synchronous reference signal is generated and output when a reproduction speed changes during reproduction, so that a decoder can be output to a decoder while data is not output while the reproduction speed is changing. , The synchronization reference signal can be transmitted correctly.

According to the fifth aspect of the invention, by recording information indicating a break of auxiliary screen data corresponding to each auxiliary screen at the time of recording, it is possible to collect one screen of auxiliary screen data at the time of special reproduction. It will be easier. Even in reverse playback, auxiliary screen data can be collected on one screen at a time,
It becomes easy to rearrange the data for one screen in reverse.

According to the sixth aspect, a header signal common to each auxiliary screen can be recorded between auxiliary screen data corresponding to each auxiliary screen during recording. This makes it easy to collect one screen of auxiliary screen data at the time of trick play, and also enables reliable decoding because a common header signal essential for decoding always precedes one screen data. Furthermore, in reverse playback, auxiliary screen data can be collected collectively for one screen, and when reading from the reverse direction, the common header signal can be read before data for one screen. Can be easily rearranged, and reliable decoding can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining a first embodiment of the present invention;

FIG. 2 is a diagram for explaining a method of rewriting a synchronous reference signal.

FIG. 3 is a block diagram for explaining a second embodiment of the present invention;

FIG. 4 is a diagram for explaining a method of adding a synchronization reference signal.

FIG. 5 is a block diagram for explaining a third embodiment of the present invention.

FIG. 6 is a block diagram for explaining a fourth embodiment of the present invention.

FIG. 7 is a block diagram for explaining a fifth embodiment of the present invention;

FIG. 8 is a block diagram for explaining a sixth embodiment of the present invention.

FIG. 9 is a block diagram of a conventional recording / reproducing apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Special reproduction data generation circuit 2 Synchronous reference signal detection circuit 3 Synchronous reference signal rewriting circuit 4 Recording signal processing circuit 5 Recording circuit 6 Recording head 7 Recording medium 8 Reproduction head 9 Reproduction circuit 10 Reproduction packet selection circuit 11 Normal reproduction data processing Circuit 12 Special reproduction data processing circuit 13 Switch 31 Synchronous reference signal removing circuit 32 Synchronous reference signal adding circuit 51 Synchronous reference signal rewriting circuit 71 Special reproduction data screen separation information generation circuit

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tomoyoko Matsumi 1006 Odakadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-7-288774 (JP, A) JP-A-7- 327202 (JP, A) JP-A-7-327201 (JP, A) JP-A-7-282545 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/76-5 / 956 G11B 20/10-20/12 H04N 7/24-7/68

Claims (7)

(57) [Claims] An input video data is converted into a packet format data.
Digital data that is recorded and reproduced on a recording medium as digital data
Data recording and reproducing device, The recording system is One or more data packets for normal reproduction including the video data
And video data for special reproduction using the video data.
One or more data packets for special playback including
Generating means for generating and generating; One or more data packets for normal reproduction and one or more
Recording digital data including the trick play data packet
Recording signal processing means for generating file data, Recording the recording digital data on the recording medium
Recording means, Playback system, Reading the digital data for recording from the recording medium
Playback means for performing playback 1 extracted from the reproduced digital data for recording
Normal reproduction including one or more data packets for normal reproduction
Digital data for recording and reproduced digital data for recording
One or more data for the special reproduction extracted from the data
Digital data for special playback including packets
Data reconstruction means for reconstructing and reconstructing; The device receiving the trick play data packet is designated.
Specified for the specified special playback speed.
And generates a synchronized reference signal.
Means for adding a synchronous reference signal to the packet, The normal reproduction data in the normal reproduction digital data.
Data packet external output and the special playback digital
External output of the special reproduction data packet in the data;
Digital data comprising output means for performing
Recording and playback device. 2. The apparatus according to claim 1, wherein said synchronous reference signal adding means includes:
To ensure synchronization with the special playback speed, the special playback
Area secured at a predetermined position in the raw data packet
And writing the generated synchronous reference signal to the memory.
Digital data recording / reproducing device. 3. The recording system according to claim 1, further comprising:
When generating the data packet for trick play,
Synchronous reference contained in the video data Signal ahead
Synchronous reference signal removed from the data packet for trick play
2. The digital data storage according to claim 1, further comprising removing means.
Recording and playback device. 4. In the reproducing system, a reproducing speed is changed.
The recording digital data by the data reproducing means.
While data cannot be read, The synchronous reference signal adding means is configured to execute the trick play data path.
Synchronization reference signal so that the device receiving the packet can synchronize
Generating a data packet for special reproduction including a signal.
Digital data recording / reproduction according to any one of 1 to 3
apparatus. 5. The method according to claim 1, wherein the input video data is converted into packet format data.
Digital data that is recorded and reproduced on a recording medium as digital data
Data recording and reproducing device, The recording system is One or more data packets for normal reproduction including the video data
And the one or more special reproductions using the video data.
One or more data packets for special playback including live video data
Generating means for respectively generating Information indicating a break for each screen of the special reproduction video data.
Screen separation information generation to generate screen separation information
Means, One or more data packets for normal reproduction, and the screen
One or more of the special reproduction data to which delimiter information is added
Generate recording digital data including packets
Recording signal processing means to be performed; Recording the recording digital data on the recording medium
Recording means, The reproduction system is Reading the digital data for recording from the recording medium
Playback means for performing playback 1 extracted from the reproduced digital data for recording
Normal reproduction including one or more data packets for normal reproduction
Digital data for recording and reproduced digital data for recording
Based on the screen separation information extracted from the
One or more special reproduction data packets sorted in chronological order
And digital data for special playback including
Means for reconstructing data; The normal reproduction data in the normal reproduction digital data.
Data packet external output and the special playback digital
Outside of the special reproduction data packet in the data Output and
Digital data comprising output means for performing
Recording and playback device. 6. A data reconstructing means for reproducing data in a reverse direction.
At this time, based on the screen separation information,
Reordering data packets in reverse playback order
A digital data recording / reproducing apparatus according to claim 5. 7. The apparatus according to claim 1, wherein the input video data is
Digital data that is recorded and reproduced on a recording medium as digital data
Data recording and reproducing method, The recording system is One or more data packets for normal reproduction including the video data
And video data for special reproduction using the video data.
One or more data packets for special playback including
Generated One or more data packets for normal reproduction and one or more
Recording digital data including the trick play data packet
Generate the data Recording the recording digital data on the recording medium, Playback system, Reading the digital data for recording from the recording medium
Play and 1 extracted from the reproduced digital data for recording
Normal reproduction including one or more data packets for normal reproduction
Digital data for recording and reproduced digital data for recording
One or more data for the special reproduction extracted from the data
Digital data for special playback including packets
Reconstructed, The device receiving the trick play data packet is designated.
Specified for the specified special playback speed.
And generates a synchronized reference signal.
Attached to the The normal reproduction data in the normal reproduction digital data.
Data packet external output and the special playback digital
External output of the special reproduction data packet in the data;
A digital data recording / reproducing method.