JPH11259976A - Optical disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk driving device which is capable of simultaneously recording digital data streams for plural channels which respectively include video components and which are to be simultaneously inputted on the same optical disk in real time and which is capable of selectively reproducing them from the optical disk. SOLUTION: Digital data streams for (n) ((n) is an integer of two or above) channels are successively read out from a first storage means 21 in which the digital data streams for (n) channels are respectively written in parallel at a speed equal to or faster than the n-fold speed of the speed at the time of writing the digital data streams in the storage means 21 to be recorded on an optical disk 22. Moreover, the digital data stream for (n) channels are successively read out from the optical disk 22 at the same speed as that at the time of the recording which is the speed equal to or higher than the n-fold speed from the disk 22 to be stored in a second storage means 29 and a prescribed digital data stream is made to be read out at a speed equal to or slower than the one-nth speed of the speed at the time of the writing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for simultaneously recording digital data streams for a plurality of channels, each including a video component and an audio component, which are simultaneously broadcast, on the same optical disk in real time. The present invention relates to an optical disk drive device for reproducing information on a disc.

[0002]

2. Description of the Related Art As is well known, in recent years, not only audio data but also video data can be compressed and recorded on an optical disk having a diameter of 12 cm, for example, the same as an audio CD (Compact Disk). I have. As this kind of optical disk, for example, a CD-ROM (Read Only Memory)
Are widely used in a wide range of fields, from information use to karaoke use.

[0003] Recently, an amount of main video data corresponding to about two hours of a movie has been recorded on an optical disk having the same diameter as a CD.
A DVD-ROM or the like in which eight types of audio data and 32 types of sub-picture data representing subtitles and the like are recorded has been developed. At present, MPEG (Moving Picture Image Coding Expert) has been internationally standardized for video data.
s Group) Use 2 compression method, and A
A DVD standard adopting the C3 compression method has also been proposed.

This DVD standard uses MPEG2 for video compression according to the MPEG2 system layer, and uses AC3 and MPEG for audio compression.
And sub-picture data obtained by run-length compression of bitmap data for subtitles,
The control data (navigation pack) for special playback such as fast forward and fast rewind is added.

In the DVD standard, an ISO (International Organization for Standar) is used so that data can be read by a personal computer or the like.
dization) 9660 and micro UDF (Universal Di
sk Format).

Incidentally, the DVD standard is a standard set for reproduction only and is not considered for a general home video recording / reproducing system. However, at present, for example, a DVD-RAM (Random Access Memory) or the like is used. like,
Optical discs capable of writing and rewriting data have also been developed. For this reason, it is highly anticipated that a home video recording / reproducing system using a rewritable optical disk will appear on the market in the near future.

On the other hand, as a current home video recording / reproducing system, there is an analog VTR (Video Tape Recorder).
der) is dominant. However, in this VTR, since the recording medium is a magnetic tape, the speed at which the magnetic head accesses the recording position of a desired television signal on the magnetic tape is low. I have.

[0008] Further, since a VTR writes a broadcasted television signal on a magnetic tape in real time, it is not possible to simultaneously record a plurality of channels of simultaneously broadcasted television signals on the same magnetic tape. It is possible.

[0009] Further, a general-use VTR is mainly composed of a television tuner circuit and a tape drive mechanism. The television tuner circuit also includes BS (Broadcasting Satellite) broadcasting, VHF (Very High Frequency), and UHF (Ultr).
a High Frequency) and CATV (Cable Television).

[0010] However, in a general home VTR, the television tuner circuit includes BS, VHF,
Since only one broadcast channel can be selected from various broadcasts such as UHF and CATV, only one of a plurality of programs broadcasted in the same time zone can be recorded as a recording source. Become.

As an exception, a VTR in which two sets of tape drive mechanisms are built in the same set is also commercially available. However, such a VTR is for supporting magnetic tapes of different physical forms, such as a VHS type magnetic tape and an 8 mm type magnetic tape.

For this reason, it is possible to simultaneously record simultaneously broadcast two-channel television signals on different types of magnetic tape in real time. It is impossible to record simultaneously on a magnetic tape in real time.

[0013]

As described above, in the conventional VTR, it takes a long time to search for a desired signal from various signals recorded on a magnetic tape, and at the same time, broadcasting is performed simultaneously. It is also impossible to record television signals for a plurality of channels simultaneously on the same magnetic tape in real time.

In view of the above circumstances, the present invention has been made in consideration of the above circumstances, and simultaneously records digital data streams for a plurality of channels, each of which includes a video component and are simultaneously input, on the same optical disk in real time. It is an object of the present invention to provide an extremely good optical disk drive capable of selectively reproducing from this optical disk.

[0015]

SUMMARY OF THE INVENTION An optical disk drive according to the present invention comprises n components which are simultaneously input and include video components.
A first storage unit in which digital data streams for (an integer of 2 or more) channels are written in parallel, respectively, and a digital data stream for n channels stored in the first storage unit is multiplied by n times the writing time. Recording means for sequentially reading at the above speed and recording it on the optical disc; and a digital data stream for n channels at a speed n times or more the same as at the time of recording from the optical disc on which the digital data stream for n channels is recorded by this recording means. , A second storage unit in which the digital data stream of n channels read by the reading unit is written, and a digital data stream of n channels stored in the second storage unit, At a speed less than 1 / n times that of writing It is obtained by so and a reproduction means for reading the data stream.

According to the above configuration, the digital data stream for n channels is written from the first storage unit in which the digital data streams for n (integer of 2 or more) are respectively written in parallel. The data is sequentially read out at a speed of n times or more and recorded on the optical disk, and a digital data stream of n channels is sequentially read from the optical disk at the same speed or more as n times or more and is stored in the second storage means. A predetermined digital data stream is read from the storage means at a speed of 1 / n times or less of the writing time, so that a digital data stream for a plurality of channels, each containing a video component and input simultaneously, can be read on the same optical disk. Recording in real time simultaneously and selectively playing back from this optical disc It can become.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, reference numeral 11 denotes a recording source / channel designation block.
The recording source / channel designating block 11 includes two analog television tuner circuits 12 and 13 and one digital television tuner circuit 14.

The analog television signal selected by the analog television tuner circuit 12 is A
After being supplied to a / D (Analogue / Digital) conversion circuit 15 and converted into a digital coded signal, it is supplied to an encoder 16 and converted into an MPEG program stream of 1 packet / 2048 bytes of DVD specification. The number of output channels of the encoder 16 is 0 or 1.

The analog television signal selected by the analog television tuner circuit 13 is A
After being supplied to a / D conversion circuit 17 and converted into a digitally coded signal, it is supplied to an encoder 18 and converted into an MPEG program stream of 1 packet / 2048 bytes of DVD specification. The number of output channels of the encoder 18 is 0 or 1.

Further, the digital multi-channel data (MPEG transport stream) output from the digital television tuner circuit 14 is supplied to a channel selector 19 to select a receiving channel and then convert the data into an MPEG program stream. Is converted. The number of output channels of the channel selector 19 is 0, 1 or 2.

In this way, each of the encoders 16, 18
And the MPEG program stream output from the channel selector 19 is stored in the drive block 20.
Is supplied to the recording buffer circuit 21. The recording buffer circuit 21 selects a stream of two channels for recording interleaved blocks on the optical disc 22 from among the three input MPEG program streams.

In this case, the two channels selected by the recording buffer circuit 21 are the two channels selected by the analog television tuner circuits 12 and 13, respectively, and the two channels selected by the analog television tuner circuit 12. A channel selected by the selector 19 and a channel selector 19;
There are three types: two channels selected in.

In the recording buffer circuit 21,
After storing the selected two channels of MPEG program streams in parallel in a recording buffer memory (not shown), the respective streams are read out and read as shown in FIG.
The DVD logical format [VOB (Vide
o Object) packet generation, multi-angle interleave arrangement, etc.].

In FIG. 2, VOBU (Video Ob
ject Unit), NV_PCK (Navigation Pack), V
_PCK (Video Pack), A_PCK (Audio Pack),
SP_PCK (Sub-Picture Pack). Also, VO
In a BS (Video Object Set), a VOB is recorded in a continuous block and an interleaved block. Furthermore, V
An OBS is a collection of one or more VOBs.

The VOB is composed of one or more cells and includes a part of the presentation data and the navigation data. The VOB is structured in a pack / packet structure defined in the system part of the MPEG2 standard. Furthermore, VOBU is VOB
Is a collection of all the packs described between the packs of NV_PCK and the pack immediately before the next NV_PCK. The pack structure consists of a pack header and one or more packets, and the length of one pack is 2048 bytes.

The multi-channel is recorded using the DVD multi-angle standard. FIG.
2 shows a method for recording a VOB according to the D standard. The VOB recording method includes a continuous block recording shown in FIG.
There is interleaved block recording shown in FIG. First, in the continuous block recording, a single VOB is recorded in a continuous logical sector and recorded. In this case, when a plurality of reproduction paths are created, seamless reproduction is not guaranteed.

The interleaved block recording is
In order to enable seamless playback of two or more paths, two or more VOBs are respectively interleaved units (I
LVU), and multiplex and record them alternately. The interleave arrangement is for each VO
B is divided into the same number of ILVUs.

The ILVU has a size equal to or smaller than a certain size, that is, the next data before the presentation data stored in the recording buffer memory is consumed, based on the capacity and access speed of the buffer memory used in the video recording / reproducing system. It is stipulated to the size that data can be supplied. Here, it is specified that the video recording / reproducing system jumps and intermittently reads only necessary interleaved data and connects them.

Here, as described above, the MPEG program streams for two channels recorded in the recording buffer memory of the recording buffer circuit 21 are controlled by the buffer controller 23 at a speed twice or more that of the writing. And converted to an interleaved format. The buffer controller 23 controls the write / read speed by controlling the write / read address and the write / read clock for the recording buffer memory continuously or intermittently.

Then, from the recording buffer circuit 21,
An MPEG program stream for two channels of the interleave format, which is output at twice or more the speed at the time of writing, is supplied to the modulation circuit 24 and is subjected to ECC.
(Error Correction Code) After the addition of the code and the modulation processing from 8 bits to 16 bits, the optical head 25
Is recorded on the optical disk 22 via the.

At this time, the optical disk 22 is controlled by the disk control circuit 26 so as to be driven to rotate at twice or more the speed of normal recording, that is, so that the recording linear velocity becomes twice or more. . The optical head 25
The optical head driver 27 controls the data write operation and the data read operation on the optical disk 22.

Here, the data flow when the MPEG program stream for two channels is interleavedly recorded on the optical disc 22 as described above will be described. In this case, interleaved recording of the MPEG program streams simultaneously obtained from the encoders 16 and 18 on the optical disk 22 will be described.

That is, it is assumed that the encoders 16 and 18 simultaneously output MPEG program streams A and B having one record data length as shown in FIG. Then, these MPEG program streams A and B are stored in the recording buffer memory of the recording buffer circuit 21 and then converted into an interleave format as shown in FIG.

In this case, the MPEG program streams A and B converted to the interleave format
Is output from the recording buffer circuit 21 at twice or more the speed at the time of writing, as shown in FIG. And
The MPEG program streams A and B output from the recording buffer circuit 21 are recorded on an optical disk 22 that is driven to rotate at twice or more the speed of normal recording.

As a result, two channels of MPEG program streams A and B are recorded on the optical disc 22.
As shown in FIG. 4D, interleaved recording is performed at a normal recording linear velocity. That is, digital data streams for two channels broadcast simultaneously can be simultaneously recorded on the same optical disk 22 in real time.

Next, at the time of reproduction, the optical disk 22 is driven to rotate at twice or more the same speed as that at the time of recording.
As shown in (e), the data recorded on the optical disk 22 is read by the optical head 25. The data read by the optical head 25 is supplied to a demodulation circuit 28, where the data is demodulated from 16 bits to 8 bits and subjected to ECC calculation processing, and then continuously reproduced in a reproduction buffer memory of a reproduction buffer circuit 29. (Not shown).

That is, the reproduction buffer circuit 29
Controlled by the buffer controller 23, all interleaved MPEG program streams A and B read from the optical disk 22 at twice the speed are stored in the reproduction buffer memory.

Then, of the MPEG program streams A and B stored in the reproduction buffer memory, only the MPEG program stream A selected by the user, for example, is read from the reproduction buffer memory as shown in FIG. The data is read at half the speed at the time of writing, that is, at a normal speed, and is converted into continuous MPEG program stream data.

The MPEG program stream A continuously output from the reproduction buffer circuit 29 is
MPEG decoder 30 and D / A (Digital / Analogue)
By the conversion circuit 31, for example, NTSC (National Telev.
The video signal is converted into an analog video signal of an ision system committee) or the like and taken out from an output terminal 32.

The recording source / channel designation block 11 and the drive block 20 are totally controlled by a system controller 33. The system controller 33 receives a request from a user via a user interface 34.

In the above description, two channels of MPEG program streams A,
B has been described in real-time and interleaved recording on the same optical disk 22 in general. However, generally speaking, the MPEG program streams for n (an integer of 2 or more) channels input at the same time are transferred to the same optical disk 22. In the case of simultaneous interleaved recording in real time, n channels of MPEG converted into an interleaved format by the recording buffer circuit 21
This can be realized by reading the program stream at a speed of n times or more the normal speed, and recording the optical disk 22 while rotating the optical disk 22 at a speed of n times or more the normal speed.

When a predetermined MPEG program stream is reproduced from the n-channel MPEG program stream interleavedly recorded on the optical disc 22, all the n-channel MP programs from the optical disc are reproduced.
This is realized by reading the EG program stream at n times the normal speed and storing it in the reproduction buffer circuit 29, and reading out the desired MPEG program stream from the reproduction buffer circuit 29 at 1 / n times the writing speed. Can be.

When a predetermined MPEG program stream is reproduced from the n channels of MPEG program streams interleavedly recorded on the optical disc 22, all n channels of MPEG programs are reproduced from the optical disc.
The required MP without reading the program stream
The present invention can also be realized by skipping and reproducing only the EG program stream from the optical disc 22.

Next, as described above, the optical disk 22
A case where it is desired to rewrite only the MPEG program stream B to a new MPEG program stream C while leaving the MPEG program stream A out of the MPEG program streams A and B interleaved and recorded above, for example, will be described.

In this case, similar to the reproduction operation described above,
First, the MPEG program streams A and B recorded interleaved are read from the optical disc 22,
The data is accumulated in the reproduction buffer circuit 29. Then, only the MPEG program stream A to be retained is read from the reproduction buffer circuit 29, and the read MPEG program stream A and the new MPEG program stream C are interleaved and recorded on the optical disk 22 again. .

FIG. 5 shows the recording buffer circuit 2
1 is shown in detail. This recording buffer circuit 21
It has two recording buffer memories 21a and 21b, and an interleave formatter 21c for converting an MPEG program stream read from the two recording buffer memories 21a and 21b into an interleave format.

In this case, a new MPEG program stream C is input to the recording buffer memory 21a via the input terminal 21d. Further, the MPEG program stream A read from the reproduction buffer circuit 29 is input to the recording buffer memory 21b via the input terminal 21e.

Each of the recording buffer memories 21a, 21
For b, the write operation and the read operation are controlled by a control signal from the buffer controller 23 supplied via the input terminal 21f. Then, the MP read from each of the recording buffer memories 21a and 21b.
The EG program streams C and A are converted into an interleave format by an interleave formatter 21c, and output to the modulation circuit 24 via an output terminal 21g.

More specifically, a new MPEG program stream C is recorded in the recording buffer memory 21a at a normal speed, as shown in FIG. Also, MPEG recorded on the optical disc 22 by interleaved recording
As shown in FIG. 6B, the program streams A and B are read from the optical disk 22 at a speed of twice or more, substantially four times or more of the normal speed, and written into the reproduction buffer circuit 29.

Of the MPEG program streams A and B stored in the reproduction buffer circuit 29, only the MPEG program stream A to be retained is the one shown in FIG.
As shown in (c), the data is read from the reproduction buffer circuit 29 at a speed of 1/4 or less of the normal speed and written into the recording buffer memory 21b.

Thus, each recording buffer memory 2
As shown in FIG. 6D, the MPEG program streams C and A stored in the interleave formatters 1a and 21b are read at four times or more the normal speed.
After being converted to the interleave format by c, the data is re-recorded in the original area of the optical disk 22 via the modulation circuit 24 and the optical head 25. It should be noted that the present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the scope of the invention.

[0052]

As described in detail above, according to the present invention,
A very good optical disc drive device capable of simultaneously recording, in real time, digital data streams for a plurality of channels, each containing a video component, which are input simultaneously, on the same optical disc and selectively reproducing from the optical disc. Can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a view for explaining a logical format of a DVD.

FIG. 3 is a view for explaining a VOB recording method according to the DVD standard.

FIG. 4 is an exemplary view for explaining a data recording / reproducing operation in the embodiment.

FIG. 5 is a block diagram showing details of a recording buffer circuit in the embodiment.

FIG. 6 is an exemplary view for explaining a data rewriting operation in the embodiment.

[Explanation of symbols]

 11: Recording source / channel designation block 12, 13, Analog television tuner circuit 14, Digital television tuner circuit, 15 A / D conversion circuit, 16 Encoder, 17 A / D conversion circuit, 18 Encoder , 19: channel selector, 20: drive block, 21: recording buffer circuit, 22: optical disk, 23: buffer controller, 24: modulation circuit, 25: optical head, 26: disk control circuit, 27: optical head driver, 28 ... Demodulation circuit, 29: reproduction buffer circuit, 30: MPEG decoder, 31: D / A conversion circuit, 32: output terminal, 33: system controller, 34: user interface.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuo Shinya 3-3-9, Shimbashi, Minato-ku, Tokyo Inside Toshiba AV EE Co., Ltd.

Claims (4)

[Claims] 1. n (2) including video components and simultaneously inputted
The first storage means in which digital data streams for the above (integer) channels are written in parallel, respectively, and the digital data streams for n channels stored in the first storage means are written n times or more as much as the writing time. Recording means for sequentially reading out the data at the speed and recording the data on the optical disc; and from the optical disc on which the digital data stream for the n channels has been recorded by the recording means, the digital data stream for the n channels is sequentially reproduced at the same n or more times as fast as the recording. Reading means for reading, second storage means for writing digital data streams for n channels read by the reading means, and digital data streams for n channels stored in the second storage means at the time of writing At a speed less than 1 / n times An optical disk drive apparatus characterized by comprising comprises a reproducing means for reading the data stream. 2. The recording means converts an n-channel digital data stream sequentially read out from the first storage means at n times or more speed at the time of writing to an interleaved format and records the digital data stream on the optical disk. The optical disk drive device according to claim 1, wherein: 3. The reading means sequentially reads digital data streams for n channels from the optical disc at a speed of 2n times or more and stores the digital data streams in the second storage means. Means for reading a predetermined digital data stream at a speed not more than 1 / 2n times as fast as writing, and the recording means reads the digital data stream stored in the first storage means at a speed not less than 2n times as fast as writing. 3. The optical disk drive device according to claim 2, wherein the data is read out, converted into an interleaved format together with the digital data stream read out from the reproducing means, and recorded on the optical disk. 4. n (2) including video components and input simultaneously
A first step of writing digital data streams of the above (integer) channels in parallel into the first memory, and a digital data stream of n channels stored in the first memory in the first step. A second step of sequentially reading and recording on an optical disk at a speed of n times or more the speed of writing, and from the optical disk on which the digital data stream for n channels is recorded in the second process, at least n times the same as at the time of recording. A third step of sequentially reading the n-channel digital data stream at the speed of (i), and a fourth step of writing the n-channel digital data stream read in the third step to the second memory.
And from the digital data stream for n channels stored in the second memory in the fourth step,
A fifth step of reading a predetermined digital data stream at a speed of 1 / n or less of the writing speed.