JPH1021645A - Data writing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable rewriting of option data in a digital video cassette recorder. SOLUTION: An Iso packet transmitted from a reproducer 1 and an Async packet transmitted from a computer 3 are received by a recorder 2 via an IEEE 1394 serial bus. The Iso data is separated in a packet receiver 11 and is then transmitted to an option data adding means 13. Moreover, the Async data is separated in the packet receiving means 11, option data is extracted in an optical data extracting means 12 and these are sent to the option data adding means 13. The option data adding means 13 writes the option data sent from the option data extracting means 12 to the optional area in the Iso data sent from the packet receiving means 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for writing system data in an optional area in a digital information signal recording device.

[0002]

2. Description of the Related Art A digital video cassette recorder (hereinafter referred to as DVCR) which digitizes a video signal and further records / reproduces the data amount on a magnetic tape by compressing the data amount is known. Ohmsha Co., Ltd., issued on August 25, 1995).

[0003] In this DVCR, a digital video signal (hereinafter referred to as video data) whose data amount is compressed, a digitized audio signal (hereinafter referred to as audio data), and various system data are recorded / reproduced.

The main system data includes video auxiliary data (hereinafter, referred to as VAUX data), audio auxiliary data (hereinafter, referred to as AAUX data), and subcode data. The VAUX data is recorded along with the video data, and the AAUX data is recorded along with the audio data. (See the above “Digital Video Reader”
Pp. 109-111).

Further, a recording area of VAUX data, AAUX data, and subcode data has a main area and an optional area. In the main area, data necessary for restoring the original video signal and audio signal, such as the TV broadcast system, sampling frequency and quantization bit number of video signal and audio signal,
Data of high importance, such as recording date, recording hour, minute, second, etc., is recorded. On the other hand, the optional area literally contains option data (hereinafter referred to as option data).
Is recorded. When a desired function cannot be realized only by data to be recorded in the main area (hereinafter referred to as main area data), option data is recorded (pp. 114 to 115 in the “Digital Video Reader” described above).

[0006]

In the above-mentioned DVCR, since various system data are recorded simultaneously when video data and audio data are recorded, they cannot be rewritten later. For this reason, depending on the option data, even if it is desired to rewrite after viewing the reproduced image or sound, it has not been possible to realize it.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a data writing method capable of rewriting option data.

[0008]

According to the data writing method of the present invention, a recording area for a digitized information signal and a recording area for system data including a main area and an optional area are defined on a recording medium. A digital information signal recording device, a digital information signal reproducing device for reproducing the recording medium, and a data generating device. When recording the digital output of the digital information signal reproducing device on the digital information signal recording device, an optional The data of the area is rewritten by the output of the data generator.

According to the present invention, when digitally dubbing the digital output of the digital information signal reproducing device to the digital information signal recording device, the data in the optional area is rewritten by the output of the data generating device.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a configuration of a video recording / reproducing system to which the present invention is applied.
The system comprises a first DVCR1 and a second DVCR1.
2 and a computer 3. And
An IEEE 139 connection between the first DVCR 1 and the computer 3 and a connection between the computer 3 and the second DVCR 2
4 are connected by serial bus cables 4 and 5.

[0011] A plurality of devices as shown in FIG.
In a system connected by a 1394 serial bus cable, signals can be transmitted between devices in an isochronous mode and an asynchronous mode. The isochronous mode is a mode in which an information signal is transmitted every predetermined communication cycle, for example, every 125 μsec, and is used when transmitting an information signal such as video data or audio data in real time. The asynchronous mode is used when irregular control signals such as a connection control command and a device operation control command are transmitted between devices as needed. In the following description, isochronous is Iso, and asynchronous is Asyn.
Described as c.

FIG. 2 shows an outline of a data flow when the present invention is applied to the system of FIG. here,
Parts corresponding to those in FIG. 1 are given the same numbers as in FIG. As shown in FIG. 2, when dubbing Iso data using the first DVCR 1 as a playback device and the second DVCR 2 as a recording device, the Asy generated by the computer 3 is used.
nc data is added to the Iso data. At this time, Iso data input from the playback device 1 to the recording device 2 includes video data, VAUX data, audio data, AAUX
Data and subcode data. Async data input from the computer 3 to the recorder 2 is VAU
It is optional data of each of X data, AAUX data, and subcode data.

In the recorder 2, Iso packets and As
a packet receiving unit 11 that receives a sync packet and distributes the data to Iso data and Async data, an option data extracting unit 12 that extracts option data from the Async data transmitted from the packet receiving unit 11,
An option data adding unit 13 for adding option data sent from the option data extracting unit 12 to Iso data sent from the packet receiving unit 11 and a recording unit 14 for recording the output of the option data adding unit 13 are provided. Have been.

The Iso packet transmitted from the reproducing apparatus 1 to the IEEE 1394 serial bus is received by the packet receiving section 11 of the recorder 2, where it is subjected to removal of a header or the like, and is converted into Iso data. Sent. In addition, the computer 3 sends an IEEE 1394
The Async packet transmitted to the serial bus is received by the packet receiving unit 11 of the recorder 2, where the Async packet is subjected to removal of the header and the like, converted into Async data, and transmitted to the option data extracting unit 12. The option data extracting unit 12 extracts option data from the Async data and sends the option data to the option data adding unit 13. The option data adding unit 13 writes the option data sent from the option data extracting unit 12 into an optional area in the Iso data sent from the packet receiving unit 11. As a result, the option data in the system data recorded by the recording unit 14 is rewritten to data generated by the computer 3.

FIG. 3 shows an example of a specific configuration of the recorder 2. The recorder 2 has a function of encoding and recording a video signal and an audio signal of a television broadcast, and an IEEE 139.
4) a function of recording video data and audio data input via the serial bus.

The recorder 2 includes a tuner 22 for selecting a video signal and an audio signal of a desired channel from a radio wave of a television broadcast received by an antenna 21, and an A / D converter for digitizing the video signal selected by the tuner 22. An A / D converter 24 for digitizing the audio signal selected by the tuner 22;
A blocking unit 25 that performs blocking and shuffling of data on the output of the converter 23 and a compression unit 26 that performs data compression on the output of the blocking unit 25 are provided.

The recorder 2 includes a microcomputer (hereinafter referred to as a mode controller) 27 for determining a mode inside the recorder 2 and a signal processing microcomputer (hereinafter referred to as an SP controller) for creating various system data. ) 28.

Further, the recorder 2 has an IEEE 139
It has a digital interface 37 to which four serial buses are connected, and switches SW1 and SW2. The digital interface 37 corresponds to the packet receiving unit 11 and the option data extracting unit 12 in FIG. The switch SW1 selects video data output from the compression unit 26 or video data and VAUX data separated by the digital interface 37. The switch SW2 is connected to the A / D converter 24.
Data or audio data separated by the digital interface 37 and AAU
Select X data.

The recorder 2 further includes a switch SW1
And a second multiplexer 30 that combines the output of the switch SW2 and the output of the SP controller 28.
A subcode data generator 31 for synthesizing a time code or the like with the output of the SP controller 28, and a first multiplexer 2
9, a parity generator 32 for combining the outputs of the second multiplexer 30 and the subcode data generator 31 and adding parity, and a time axis of data for recording on the output of the parity generator 32. , A channel coder 34 for performing recording modulation processing on the output of the time base collector 33, a recording amplifier 35 for amplifying the output of the channel coder 34, and a magnetic tape (not shown). ) Is provided.

Next, referring to FIG. 4, an operation for recording a television broadcast signal will be described. Here, the blocks indicated by the dotted lines mean blocks that are not operating.

The electric wave of the television broadcast received by the antenna 21 is input to the tuner 22. The tuner 22 separates the video signal a and the audio signal b of the desired channel specified by the user according to the channel selection signal c sent from the mode controller 27.

The video signal a is digitized by the A / D converter 23, subjected to blocking and shuffling by the blocking unit 25 to increase the data compression efficiency, and is subjected to discrete cosine transform and variable length code by the compression unit 26. The data is subjected to data compression processing such as conversion, and is input to the first multiplexer 29 through the switch SW1. At this time, the switch SW1 selects the output of the compression unit 26. Similarly, the audio signal b is supplied to the A / D converter 24
, And input to the second multiplexer 30 through the switch SW2.

The mode controller 27 stores various main area data d, for example, a television broadcasting system, a channel, a sampling frequency of a video signal and an audio signal, a recording date and time, a recording start position (REC START) and a recording end position (REC END) on a video tape. ), And optional area data e, which are provided to the SP controller 28. The SP controller 28 supplies the VAUX data f to the first multiplexer 29, the AAUX data g to the second multiplexer 30, and the subcode data h to the subcode generator 31 for the main area data d and the option data e.
To give each.

The first multiplexer 29 combines the video data sent from the compression section 26 with the VAUX data f sent from the SP controller 28 and sends them to the parity generator 32. Similarly, the second multiplexer 30 outputs A
The audio data sent from the / D converter 24 and the AAUX data g sent from the SP controller 28 are combined and sent to the parity generator 32. Then, the subcode generator 31 adds the internally generated time code or the like to the subcode data h sent from the SP controller 28 and sends it to the parity generator 32.

The parity generator 32 combines the outputs of the first multiplexer 29, the second multiplexer 30, and the subcode data generator 31, and adds a parity. The output of the parity generator 32 is time-aligned by a time base collector 33, and a channel coder 34
Is subjected to a recording modulation process such as 24-25 conversion, and is amplified to a predetermined level by a recording amplifier 35 and given to a magnetic head 36.

Next, referring to FIG. 5, an operation for rewriting the option data will be described. Also in this case, the blocks indicated by the dotted lines mean inactive blocks.

The Iso packet transmitted from the reproducing device 1 in FIG. 2 and the Async packet transmitted from the computer 3 are input to the digital interface 37 via an IEEE 1394 serial bus.

The digital interface 37 is an
The data (video data + VAUX data) i and (audio data + AAUX data) j are separated and sent to the first multiplexer 29 and the second multiplexer 30 via the switches SW1 and SW2, respectively. Also, the digital interface 37 is an Asyn
The option data e, which is c data, is separated and sent to the SP controller 28. The SP controller 28 converts the VAUX option data f ′, the AAUX option data g ′, and the subcode option data h ′ of the option data e into a first multiplexer 29, a second multiplexer 30, and a subcode generator, respectively. Send to 31.

The first multiplexer 29 includes a switch S
Of the (video data + VAUX data) input through W1, the VAUX option data is replaced with the VAUX option data f 'sent from the SP controller 28. Further, the second multiplexer 30 includes a switch S
W2 input (audio data + AAUX
AAUX option data in SP2
8 is replaced with the AAUX option data g 'sent from. The subcode generator 31 adds the internally generated time code or the like to the subcode option data h 'sent from the SP controller 28. That is, the playback device 1
Is rewritten with the option data sent from the computer 3. In addition,
At this time, part of the main area data is rewritten in order to record information indicating that digital dubbing has been performed.

The outputs of the first multiplexer 29, the second multiplexer 30, and the subcode generator 31 are sent to a parity generator 32. Subsequent processes are the same as those at the time of the television broadcast recording described above, and thus description thereof will be omitted.

[0031]

As described above in detail, according to the present invention, it is possible to rewrite option data during digital dubbing of a digital information signal.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a video recording / reproducing system to which the present invention is applied.

FIG. 2 is a diagram showing an outline of a data flow when the present invention is applied to the system of FIG. 1;

FIG. 3 is a block diagram showing an example of a specific configuration of the recorder in FIG. 2;

4 is a diagram illustrating an operation when the recorder of FIG. 3 records a television broadcast.

FIG. 5 is a diagram illustrating an operation when the recorder of FIG. 3 rewrites option data.

[Description of Signs] 1 ... DVCR, playback device, 2 ... DVCR, recorder, 3 ... Computer, 4,5 ... IEEE1394 serial bus

Claims (5)

[Claims] 1. A digital information signal recording device in which a recording area of a digitized information signal and a recording area of system data including a main area and an optional area are defined on a recording medium, Using a digital information signal reproducing device for reproduction and a data generating device, when recording a digital output of the digital information signal reproducing device on the digital information signal recording device, outputting data of the optional area to the data generating device. A data writing method characterized by rewriting with (1). 2. The digital information signal recording device, the digital information signal reproducing device, and the data generating device,
2. The data writing method according to claim 1, wherein the data writing method is connected by a serial bus based on EEE1394. 3. The digital information signal reproducing device according to claim 1, wherein a digital output is transmitted to said digital information signal recording device in an isochronous packet, and an output of said data generating device is transmitted to said digital information signal recording device in an asynchronous packet. 3. The data writing method according to item 2. 4. The data writing method according to claim 1, wherein the digitized information signal is video data and audio data. 5. The data writing method according to claim 4, wherein the system data is video auxiliary data, audio auxiliary data, and subcode data.