JPH07192402A - Optical disk recorder - Google Patents

Abstract

PURPOSE:To obtain a date editing process with one track as unit by performing shuffling processing, etc., for every channel, for one track of audio data of plural channels, providing a gap between channels and recording them on respective tracks. CONSTITUTION:Data unit constitution parts 1v and 1a receive the video data Dv1 and the audio data Da1, to constitute the data for one track, that is, for 2/3 frame. Shuffling parts 2v and 2a shuffle the video data and audio data for one track. Outer correction code parts 3v and 3a add an outer error correction code to the shuffled data to output as the video data Dv2 and the audio data Da2. In a PAL system, since the audio data of four channels are shuffled and correction code added in one frame at every four channels, and for two frames is recorded on three tracks, the data editing process with one frame as unit is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording apparatus for recording video data and audio data on an optical disk, and more particularly audio data of a plurality of channels for n (n is an integer of 1 or more) frames (or fields) ( The present invention relates to an optical disk recording device for editably recording on (n + 1) tracks.

[0002]

2. Description of the Related Art Generally, when recording video data and audio data in an optical disk recording apparatus, the optical disk is rotated at a constant speed synchronized with a frame frequency or a field frequency, and a recording clock is changed according to the peripheral speed of a track. Then, high-density recording is performed so that the recording bit wavelength becomes constant. For example, when recording NTSC system video data and audio data, since the NTSC system frame frequency is 30 Hz, the optical disc is rotated 30 times per second.
One track of video data and audio data is recorded per track.

FIG. 11 is a block diagram showing an example of an optical disk recording apparatus. Here, the optical disk 21 can be recorded on both sides, and rotates at a constant speed of 30 rotations per second to record one frame of the video data Dv1 and the audio data Da1 on one track. Optical heads 22 and 23 are provided on the front surface side and the back surface side of the optical disc 21, respectively, and the optical head 22 moves from the outer circumference to the inner circumference of the optical disc 21 to record the front surface side recording data D14. Simultaneously moving from the inner circumference to the outer circumference of the optical disc 21, the back side recording data D15 is recorded.

Now, the shuffling portions 12v and 12a
Is the video data Dv1 and the audio data Da1.
Shuffling each frame. The outer correction code units 3v and 3a respectively add outer error correction codes to the video data Dv12 and the audio data Da1.
Output as 2. The data integration unit 4 uses the video data D
The v12 and the audio data Da12 are received and integrated. The inner correction code unit 5 adds the synchronization data, the inner correction code, and the like to generate the recording data D13.

The data distribution unit 6 divides the recording data D13 into recording data on the front surface side and the back surface side of the optical disk. The recording encoders 7 and 8 record-encode the divided recording data and distribute it to the optical heads 22 and 23 as the front-side recording data D14 and the back-side recording data D15, respectively. In this case, the sum of the bit rates of the recording data D14 and D15 is always kept constant, and data is distributed according to the distance from the center of the optical disk 21 to the optical heads 22 and 23, so that the recording wavelength is kept constant. I am trying to become.

For audio data consisting of a plurality of channels, AUX data is added to each channel to perform shuffling, and then an error correction code or the like is added to provide an editing gap between the channels. Is recorded. The AUX data is data indicating information about audio data such as sampling frequency, number of quantization bits, and number of channels. The edit gap is a gap on the recording track that is inserted between video data and audio data, and between each channel of audio data, and it absorbs head mounting errors, wow and flutter, etc. to perform data editing operations. This is an area for recording meaningless data for the sake of simplicity.

When recording PAL video data and audio data on an optical disc, P
The frame frequency of the AL system is 25 Hz, and the bit rate of the video data is 25 compared to the NTSC system.
%, The optical disc rotation speed is set to NT in order to record at the same recording bit wavelength as in the NTSC system.
The recording speed is 1.25 times that of the SC system, that is, 1.5 times the PAL system frame frequency, and 37.5 revolutions per second, and two frames are recorded on three tracks.

[0008] For example, when recording PAL video data and 4-channel audio data,
As shown in FIG. 12, two frames are recorded on three tracks. Although FIG. 12 shows three tracks on the front surface side of the optical disk, the same applies to the back surface side. Here, a track jump gap (TJ), a track address (TA) indicating a track position on the disc, a preamble (PR), an edit gap (E), and 1/6 frame of video data are sequentially provided from the beginning of each track. (V
0), 4-channel audio data (A1, A2, A3, A4) separated by the editing gap (E),
The video data (V1) for 1/6 frame and the postamble (PO) at the end.

In this case, for video data, 1 /
After shuffling in units of three frames and adding an error correction code and the like, the data is distributed to the front and back surfaces of the optical disc and two frames are recorded on each of three tracks. Also, for the 4-channel audio data A1, A2, A3, A4, 2 frames for each channel are shuffled, divided into 3 parts and added with error correction codes, and then distributed to the front and back surfaces of the optical disk. However, an edit gap (E) is provided between each channel to record on three tracks.

[0010]

As described above, NT
In the case of SC system video data and audio data, one frame is recorded in one track, so that data editing in units of one frame can be performed without any trouble.
However, in the case of PAL system video data and audio data, one frame cannot be recorded in one track, and two frames are recorded in three tracks. Therefore, for example, in order to change the order of still images or to combine fast-moving images, which requires data editing on a frame-by-frame basis or on a field-by-field basis, it is possible to edit video data, but to edit multiple channels. It is impossible to edit the audio data of.

That is, as shown in FIG. 12, since the video data is shuffled and recorded in the unit of 1/3 frame, the editing process in the unit of track or the unit of frame can be relatively easily executed. However, since the audio data of a plurality of channels is shuffled by 2 frames for each channel and dividedly recorded into 3 tracks,
Two tracks of data are mixed in each track, and therefore editing processing in track units or frame units cannot be performed.

An object of the present invention is to record (n + 1) lines of data for n (n is an integer of 1 or more) frames or n fields, as in the case of recording PAL system video data and audio data. An object of the present invention is to provide an optical disk recording apparatus capable of recording audio data of a plurality of channels editable in track units or in frame or field units when recording is divided into tracks.

[0013]

In the optical disk recording apparatus of the present invention, n (n is an integer of 1 or more) frame (or field) worth of video data and plural channels of audio data are provided with an editing gap between each data. In an optical disc recording apparatus which is provided and records on (n + 1) tracks, shuffling and error correction code addition are performed on audio data of the plurality of channels in data units of n / (n + 1) frames (or fields) for each channel. The above processing is performed to record on the track.

Further, the optical disk recording apparatus of the present invention has
(N is an integer of 1 or more) Frame (or field)
Minute video data and audio data of multiple channels with an editing gap between each data (n + 1)
In an optical disc recording device for recording on a book track,
The audio data of the plurality of channels are subjected to processing such as shuffling and addition of an error correction code in a data unit of one frame (or field) for each channel, and the first and (of the (n + 1) tracks are recorded. Data of n / (n + 1) frames (or fields) per channel including the editing gap are recorded on the (n + 1) th track, respectively, and t
The (t is an integer of 2 ≦ t ≦ n) th track includes the editing gap of the data of the previous frame (or field) of the adjacent frames (or fields) (t−1) / (N + 1) frames (or fields) and subsequent frames (or fields)
Including the editing gap of the data of (n-t + 1)
/ (N + 1) frames (or fields) are recorded.

[0015]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. The same components as those of the conventional example shown in FIG. 11 are designated by the same reference numerals. First, a case will be described in which two frames of PAL video data and four channels of audio data are recorded on three tracks so that they can be edited in track units.

Input PAL video data Dv1
Indicates that the number of quantization bits is 8 bits (1 byte) and the effective data amount of one frame is 948 samples × 612 lines = 5.
The data is 80176 bytes. In addition, as shown in FIG. 6, a 2-byte synchronization signal (SYNC), an ID signal (SBID), a system data (SCDT), and 1 byte each.
If a sync block (hereinafter abbreviated as SB) consisting of a total of 180 bytes of 58 bytes of data (video data, audio data) and 16 bytes of inner code correction code is configured and recorded, one frame of video is recorded. The data amount is 3672 (580176/158) SB. The amount of video data recorded on one track is 24
48 (3672 SB × 2 frames / 3 tracks) SB.

The input audio data Da1 is quantized into 20 bits (2.5 bytes) at a sampling frequency of 48 kHz for each channel, which is generally used in broadcasting VTRs (D-2VTR, D-3VTR). The data is Here, since the rotation speed of the optical disk 21 is 37.5 rotations per second, a sample of audio data of each channel recorded in one track (hereinafter referred to as AS
(Abbreviated as) number is 48000 / 37.5 = 1280A
It becomes S. Since 1AS is 2.5 bytes, 1
280AS = 1280 × 2.5 = 3200 bytes. Further, since AUX data is further added to this audio data by 64AS (160 bytes) for each channel, 1344AS (3360 bytes) of audio data for each channel is recorded in one track.

Now, the data unit constituent parts 1v and 1a
Is the video data Dv1 and the audio data Da1.
In response to this, one track worth, that is, a data unit of 2/3 frame is constructed. In this case, AUX is added to the audio data (1280AS) of each channel for one track.
Since the data (64AS) is added respectively, the data amount of each of the 4-channel audio data A1, A2, A3, A4 is 1344AS. The shuffling units 2v and 2a respectively shuffle video data and audio data for one track. The shuffling of audio data in the shuffling unit 2a will be described later.

The outer correction code units 3v and 3a respectively add outer error correction codes to the shuffled data and output them as video data Dv2 and audio data Da2. The data integration unit 4 receives and integrates the video data Dv2 and the audio data Da2. The inner correction code unit 5 adds the synchronization data, the inner correction code, and the like to generate the recording data D3. The data distribution unit 6 distributes the recording data D3 to the recording data on the front surface side and the back surface side of the optical disc so that the recording wavelength becomes constant, as in the conventional example. The recording encoders 7 and 8 record-encode the distributed recording data, and send it to the optical heads 22 and 23 as front-side recording data D4 and back-side recording data D5, respectively, for recording.

FIG. 2 shows the data arrangement when two frames of video data and four-channel audio data are recorded on the three tracks on the front side of the optical disc, and the rear side has the same arrangement. Here, the track jump gap (T
J), track address (TA) indicating the track position on the disc, preamble (PR: 2SB), editing gap (E: 4SB), video data (V0) for 1/6 frame, editing gap (E: 4 channel separated audio data (A1, A2, 4SB)
A3, A4), video data for 1/6 frame (V
1), and the postamble (PO: 2SB) is arranged at the end. The track jump gap (TJ) and track address (TA) are 380μ.
It is specified by the time width of sec and 150 μsec.

As described above, in the video data, one track is divided into V0 and V1 corresponding to the frame, and further,
It is distributed on the front and back surfaces of the optical disc and recorded on each track. In addition, 4-channel audio data A1, A
2, A3 and A4 are shuffled in units of one track for each channel, separated by an editing gap (E), and recorded on each track on the front and back surfaces of the optical disc.

Next, the shuffling of audio data in the shuffling section 2a will be described in detail.

As described above, the audio data amount of each channel for one track is 1344AS (3360).
Byte), and the data area per SB is 15
Since it is 8 bytes, the number of SBs required to record audio data of each channel on one track is 3360 ÷
22SB is necessary because 158≈21.26.
Therefore, the shuffling of the audio data is executed for each channel by the shuffling map of 158 rows × 22 columns as shown in FIG.

Here, m indicates the byte number (0 to 157) of the sync block, n indicates the SB number (0 to 21), and the numbers in the shuffling map indicate the audio data in one track. The sample number (#AS) is shown. By the way, since 1AS is 2.5 bytes,
The total writing area in the shuffling map is (158 ÷
2.5) × 22 = 1390.4 AS. On the other hand, the audio data amount of each channel for one track is 134
Since it is 4AS, the writing area of the audio data to be shuffled is set to 1364AS (m: 0 to 155),
"0" is written in all the remaining areas (m: 155 to 157).

When shuffling, sample numbers # AS0 to # AS1363 are attached to the audio data (1364AS) of each channel. For example, 0≤ # AS≤1279 is valid audio data.
1280 ≦ # AS ≦ 1299 is “0”, 1300 ≦ #
AS ≦ 1363 is AUX data.

Then, shuffling is performed by the shuffling algorithm defined by the following equations (1) to (6).
In this case, since 1AS of audio data is 20 bits (2.5 bytes), as shown in FIG.
9 (MSB) to b0 (LSB) are converted into 1-byte unit symbols.

N = # AS mod 22 (1) Bits b19 to b12 in [INT (# AS / 22) mod 2 = 0] m = [5.INT (# AS / 44) + 5.n] mod 155 ...... (2) Bits b11 to b4 in [INT (# AS / 22) mod 2 = 0] m = [5.INT (# AS / 44) + 5.n + 1] mod 155 ...... (3) [INT (# Bit b3 to b0 in AS / 22) mod 2 = 0] + bit b3 to b0 in [INT (# AS / 22) mod 2 = 1] m = [5.INT (# AS / 44) + 5.n + 2] mod 155 (4) Bits b19 to b12 in [INT (# AS / 22) mod 2 = 1] m = [5.INT (# AS / 44) + 5.n + 3] mod 155 (5) [INT ( AS / 22) mod 2 = 1 bit b11~b4 in] m = [5 · INT (# AS / 44) +5 · n + 4] mod 155 ...... (6) of the 4-channel audio data A1, A2, A3, A
4 is shuffled for each channel in the shuffling unit 2a based on the above equations (1) to (6), and then an outer error correction code and an inner error correction code are added respectively, as shown in FIG. It has a data structure. Here, since the outer error correction code (8SB) is added to the audio data (22SB) of each channel,
It becomes audio data of 30 SB each.

The data distribution unit 5 distributes each audio data of 30 SB to the front surface side and the back surface side of the optical disk by 15 SB at a ratio of 1: 1. That is, 30 SB
If a serial number is added to the audio data of, the even-numbered SBs are allocated to the front side and the odd-numbered SBs are allocated to the back side so that both sides of the optical disk are simultaneously written. In this way, one track of four-channel audio data is shuffled for each channel and recorded on the optical disc. By recording in this way, data editing processing can be performed in track units.

Next, a method of recording the 4-channel audio data so that it can be edited frame by frame will be described.

As described above, the input audio data Da1 has the sampling frequency 48 for each channel.
The data is quantized to 20 bits (2.5 bytes) at kHz, and the frame frequency of the PAL system is 25.
Hz. Therefore, the number of samples of audio data of each channel per frame is 48000 ÷ 25 =
It is 1920AS (4800 bytes). The audio data is shuffled by 1984AS (4960 bytes) in which AUX data is added by 64AS (160 bytes).

In this case, the number of SBs required to record 1984AS (4960 bytes) audio data is
32SB is necessary because 4960 ÷ 158≈31.39. Therefore, the shuffling of the audio data is executed for each channel by the shuffling map of 158 rows × 32 columns as shown in FIG.

Here, m indicates the byte number (0 to 157) of the sync block, and n indicates the SB number (0 to 31). The numbers in the shuffling map are sample numbers (#AS) of audio data for one frame.
Is shown. By the way, 1AS is 2.5 bytes, and the total writing area in the shuffling map is (158
÷ 2.5) × 32 = 2022.4AS, so the writing area of the shuffling map is 1984AS (m: 0).
155), and "0" is written in all the remaining areas (m: 155 to 157).

In shuffling, sample numbers # AS0 to # AS1983 are given to the audio data 1984AS for one frame, respectively.
0 ≦ # AS ≦ 19 19 is audio valid data, 19
20 ≦ # AS ≦ 1983 is AUX data.

Then, shuffling is performed by the shuffling algorithm defined by the following equations (7) to (12). In this case, since 1AS of audio data is 20 bits (2.5 bytes), as shown in FIG.
9 (MSB) to b0 (LSB) are converted into 1-byte unit symbols.

N = # AS mod 32 (7) Bits b19 to b12 in [INT (# AS / 32) mod 2 = 0] m = [5.INT (# AS / 64) + 5.n] mod 155 (8) Bits b11 to b4 in [INT (# AS / 32) mod 2 = 0] m = [5.INT (# AS / 64) + 5.n + 1] mod 155 .. (9) [INT (# Bit b3 to b0 in AS / 32) mod 2 = 0] + bit b3 to b0 in [INT (# AS / 32) mod 2 = 1] m = [5.INT (# AS / 64) + 5.n + 2] mod 155 (10) Bits b19 to b12 in [INT (# AS / 32) mod 2 = 1] m = [5.INT (# AS / 64) + 5.n + 3] mod 155 ... (11) [IN (# AS / 32) bits b11 to b4 in mod 2 = 1] m = [5.INT (# AS / 64) + 5.n + 4] mod 155 (12) Four-channel audio data A1, A2, A3 A
4 in the shuffling portion 2a is expressed by the above formulas (7) to (1).
After shuffling for each channel based on 2),
An outer error correction code and an inner error correction code are added respectively to form a data structure as shown in FIG. here,
The outer error correction code (8SB) is added to the audio data (32SB) of each channel.
It becomes audio data of 0SB. This audio data is equally divided and recorded on the front surface side and the back surface side of the optical disc.

FIG. 7 shows a data arrangement for recording two frames of four-channel audio data on three tracks on the front surface side of the optical disk, and the rear surface side is also the same. Here, a track jump gap (TJ), a track address (TA) indicating a track position on the disc, and a preamble (PR: 2) are sequentially arranged from the beginning of each track.
SB), editing gap (E: 4SB), 1/6 frame video data (V0), editing gap (E: 4)
4 channels of audio data (A1, A2, A3, A4) separated by SB), 1/6 frame of video data (V1), and finally a postamble (PO: 4SB) are arranged.

In this case, the three sides of each of the front and back surfaces of the optical disk
In the first track of the tracks, 15SB of each of the 4-channel audio data (A1, A2, A3, A4) corresponding to the first frame of the 2 frames is recorded in 4S.
It is recorded separately by the editing gap (E) of B. In addition, in the second track on each of the front and back surfaces of the optical disc, the remaining 5 SB of audio data of each channel corresponding to the first frame and the 5 S of each audio data of each channel corresponding to the second frame.
B is separately recorded by the editing gap (E). Further, 15 SB of audio data of each channel corresponding to the second frame is recorded on the third track on each of the front and back surfaces of the optical disc, separated by an editing gap (E).

In this case, the audio data amount of the first frame recorded on the first track is 80 SB in total of audio data 60 (15 × 4) SB for four channels and the editing gap 20 (4 × 5) SB. And also
The audio data amount of the first frame to be recorded on the second track is 4 channels of audio data 20.
(5 × 4) SB and editing gap 20 (4 × 5) SB are 40 SB in total. Therefore, 2/3 of the total data amount 120SB of the first frame including the editing gap
Is recorded on the first track, and the remaining 1/3 is recorded on the first half of the second track.

Similarly, the second recorded on the second track
The audio data amount of the frame is a total of 40 SB including the audio data 20SB for four channels and the editing gap 20SB, and the audio data amount of the second frame recorded on the third track is the audio data for four channels. The total of the remaining 60 SB and the editing gap 20 (4 × 5) SB is 80 SB. Therefore,
The total amount of data in the second frame including the editing gap 1
One-third of 20 SB is recorded in the latter half of the second track, and the remaining 2/3 is recorded in the third track.

In this way, the audio data of four channels is shuffled and the error correction code is added in units of one frame for each channel, and an edit gap is provided between the channels to record two frames on three tracks. By doing so, data editing processing can be performed in units of one frame.

[0042]

As described above, according to the present invention, for example, when recording video data and audio data of the PAL system, n (n is an integer of 1 or more) frames or n fields. When recording audio data of multiple channels on (n + 1) tracks, shuffling processing is performed on each track of the audio data of multiple channels for each channel, and a gap is provided between the channels to record on each track. By doing so, data editing processing can be performed in track units.

Further, one frame of audio data of a plurality of channels is shuffled for each channel, and a gap is provided between the channels to record on each track, thereby enabling data editing processing in frame units. Becomes Therefore, it is possible to edit the audio data of a plurality of channels, for example, when the order of the still images is changed, the moving images are synthesized, or the like, which requires data editing in units of one frame or one field.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an arrangement example of PAL system video / audio data on a track that enables data editing processing in track units.

FIG. 3 is a diagram showing an example of a shuffling map applied to audio data in track units.

FIG. 4 is a graph of 20 in the shuffling map shown in FIG.
It is a figure which shows the process which converts bit audio data into a 1-byte symbol.

FIG. 5 is a diagram showing a data configuration example of 4-channel audio data in track units.

FIG. 6 is a diagram showing a configuration example of a sync block.

FIG. 7 is a diagram showing an arrangement example of PAL system video / audio data on a track that enables data editing processing in frame units.

FIG. 8 is a diagram showing an example of a shuffling map applied to audio data in frame units.

FIG. 9 is a graph of 20 in the shuffling map shown in FIG.
It is a figure which shows the process which converts bit audio data into a 1-byte symbol.

[Fig. 10] Fig. 10 is a diagram illustrating a data configuration example of 4-channel audio data in frame units.

FIG. 11 is a block diagram showing an example of a conventional optical disc recording apparatus.

FIG. 12 is a diagram showing an arrangement example of conventional PAL video / audio data on a track.

[Explanation of symbols]

 1v, 1a Data unit configuration section 2v, 2a Shuffling section 3v, 3a Outer correction coding section 4 Data integration section 5 Inner correction coding section 6 Data distribution section 7, 8 Recording coding section 21 Optical disc Dv1, Dv2 Video data Da1, Da2 Audio data D4 Front side recording data D5 Back side recording data

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04N 5/85 Z 5/92

Claims (2)

[Claims] 1. An optical disc for recording n (n is an integer of 1 or more) frames (or fields) of video data and audio data of a plurality of channels on (n + 1) tracks with an edit gap provided between the data. In a recording device, the plurality of channels of audio data are subjected to processing such as shuffling and error correction code addition in units of n / (n + 1) frames (or fields) of data for each channel, and recording on the track. An optical disk recording device characterized by the above. 2. An optical disk for recording n (n is an integer of 1 or more) frames (or fields) of video data and audio data of a plurality of channels on (n + 1) tracks with an edit gap provided between the data. In the recording device, the audio data of the plurality of channels is subjected to processing such as shuffling and addition of an error correction code in a data unit of one frame (or field) for each channel, and the processing is performed among the (n + 1) tracks. Data of n / (n + 1) frames (or fields) per channel including the editing gap is recorded on the first and (n + 1) th tracks, respectively, and t
The (t is an integer of 2 ≦ t ≦ n) th track includes the editing gap of the data of the previous frame (or field) of the adjacent frames (or fields) (t−1) / (N + 1) frames (or fields) and subsequent frames (or fields)
Including the editing gap of the data of (n-t + 1)
An optical disk recording device for recording / (n + 1) frames (or fields).