JP3077312B2 - Digital video signal recording or playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video signal recording / reproducing apparatus which can support a plurality of television standard systems.

[0002]

2. Description of the Related Art Conventionally, a V-1 (D-1 VTR) of a so-called 4: 2: 2 system of a D-1 system for digitally recording a video signal (Y, RY, BY) in a component format.
It has been known. In the D-1 VTR, video data for one field is recorded over 20 video sectors for 10 inclined tracks in the case of a 525/60 system with 525 lines and a nominal field frequency of 60 Hz. The number of lines is 625 and the field frequency is 50H.
In the case of the z / 625/50 system, recording is performed over 24 video sectors of 12 inclined tracks.

As a result, the pattern of the inclined track in the D-1 system is substantially common to the two standard systems in which the field period, in other words, the number of pixels constituting the image is different, and the data transmission speed is the same. It can be. In order to reduce the data transmission speed, the D-1 VTR employs, for example, a four-channel processing method using four rotating magnetic heads.

[0004] In the case of the 525/60 system, as shown in FIG. 7, the luminance signal Y has the number of pixels Px: 72 in the horizontal direction (per line) in the case of the 525/60 system.
0, the number of lines Ln in the vertical direction is 500, and the pair of color signals Cr and Cb are respectively the number of pixels Px per line:
360, the number of lines Ln in the vertical direction is 500. The quantization number Qv of each pixel of the luminance signal Y and the color signals Cr and Cb is 10 bits.

In the case of the 625/50 system, as shown in FIG. 8, the luminance signal Y is expressed by the number of pixels Px: 7 per line.
20, the number of lines Ln in the vertical direction is 600, and the pair of color signals Cr and Cb are the number of pixels P per line, respectively.
x: 360, the number of lines Ln in the vertical direction: 600.
The quantization number Qv of each pixel of the luminance signal Y and the color signals Cr and Cb is 10 bits.

[0006] In the D-1 VTR, the audio signal is 48 kHz.
As shown in the figure, the number of samples Sx per channel in one frame period is 1920 and the number of quantizations Qs is 24 bits in each case.
In the case of the 525/60 system, as shown in parentheses,
The number of samples Sx per channel is 1600.
In a so-called 4: 2: 2: 4 VTR, FIG.
As shown by a broken line, a key signal Ky having the same data amount as the luminance signal Y is used for control and special effects.

Recently, there has been proposed a high-definition television system, a so-called HD system, in which the definition is remarkably improved as compared with the above two standard systems. In this HD system, as shown in FIG. 9, for example, in one frame of image data, the luminance signal Y has the number of pixels Px per line: 1920, the number of lines Ln in the vertical direction: 1035, and a pair of colors. Signal P
r and Pb are the number of pixels per line Px: 96, respectively.
0, the number of lines Ln in the vertical direction is 1035. The quantization number Qv of each pixel of the luminance signal Y and the color signals Pr and Pb is 8 bits.

[0008]

As is well known, digitally recorded images have little deterioration in image quality even after being copied many times, so that digital VTRs are used, for example, for editing video tapes for business use. Is done. In this video tape editing, it is common to set an editing point for each frame.

However, in the conventional apparatus, the number of pixels constituting an image differs according to the video signal broadcasting system, and the tape is fixed in a format corresponding to each system. A regenerator was needed on a one-to-one basis. Therefore, conventionally, there has been a problem that digital recording / reproduction that can be edited in real time cannot be performed regardless of the number of constituent pixels of an image.

In recent years, computer-based image processing has become popular, and computer graphics (C
In G) or medical electronics (ME), it is becoming common to select an optimal pixel configuration as needed without being restricted to the conventional television standard system. Therefore, there is a demand for an image recording / reproducing apparatus that can be used in all systems.

In view of the foregoing, it is an object of the present invention to be able to digitally record or reproduce a plurality of types of video signals on a common medium using a common device regardless of the number of pixels constituting an image. A digital video signal recording or reproducing apparatus is provided.

[0012]

A first aspect of the present invention is a digital video signal recording apparatus for recording digital video signals of a plurality of standard systems on a medium D, wherein a digital video signal corresponding to a plurality of standard systems is provided. A plurality of interface means 11a to 11n supplied respectively, a selection means 12 for selecting one of the plurality of interface means, a storage means for storing a plurality of standard screen setting information, and Based on the screen setting information of the specific reference method corresponding to the interface means 11a to 11n selected by the selection means 12, a plurality of digital video signals are supplied from the screen unit supplied through the selected interface means 11a to 11n. Encoding means 31 and 36 for forming a plurality of code block data, and a plurality of code block data A digital video signal recording apparatus and a recording data forming means 32 and 37 to form the recording data are arranged in.

A second aspect of the present invention is a digital video signal reproducing apparatus for reproducing data recorded on a medium and outputting a digital video signal, comprising a plurality of interface means 11a to 11n respectively corresponding to a plurality of standard systems. A selecting means 12 for selecting one of the plurality of interface means 11a to 11n; a reproduced data separating means 34 for separating a plurality of code block data arranged in a predetermined order in data reproduced from a medium; 37, storage means for storing screen setting information of a plurality of standard methods, and screen setting information of a specific reference method corresponding to the interface means 11a to 11n selected by the selecting means 12 among the screen setting information. Decoding means for forming a digital video signal in screen units of a specific standard system from a plurality of sorted code block data And a 5,36, interface means 1 for the output of the decoding means 35 and 36 are selected
1a to 11n.

[0014]

According to the present invention, a plurality of video signals are digitally recorded or reproduced on a common medium using a common device.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a digital video signal recording or reproducing apparatus according to the present invention will be described below with reference to FIGS.

FIG. 1 shows the configuration of an embodiment of the present invention.
In FIG. 1, 1a and 1b are D-1 VTRs corresponding to the 525/60 system and the 625/50 system, respectively.
1n is a digital VTR corresponding to the HD system, and each VTR 1a, 1b, 1n is together with a digital VTR of another system not shown through interfaces 11a, 11b # 11n dedicated to each standard system. Selector 12
Connected to each other. In addition, each interface 11a
To 11n are stored in the memories (not shown) of the dimensions (Px × Ln ×
Qv) is stored.

A system control circuit (microprocessor) 20 is connected to each of the interfaces 11 a to 11 n and the selector 12 via a data bus 21.
In this embodiment, the recording key 22 and the reproduction key 23 are provided in order to use the apparatus independently, that is, what is called a stand-alone. However, as shown by a broken line, control by the host computer HC is also possible.

Reference numeral 31 denotes an encoder, and 32 denotes a formatter. The encoder 31 has one of a plurality of interfaces 11a to 11n via a selector 12.
For example, the interface 11a of the 525/60 system is connected. In the recording mode, the output of the encoder 31 is supplied to the optical head 33 via the formatter 32 and is recorded on an appropriate medium D such as a magneto-optical disk. Reference numeral 34 denotes a separator, and reference numeral 35 denotes a decoder. In the reproduction mode, a reproduction signal of the optical head 33 is supplied to the decoder 35 via the separator 34. For example, 525/6 through the selector 12
0 interface 11a is connected.

In the recording mode, the encoder 31 and the formatter 32 are controlled by the microprocessor 20 via the sequencers 36 and 37, respectively. Further, in the reproduction mode, the separator 34 and the decoder 35 are respectively operated by the microprocessor 20 by the sequencers 37 and
Controlled via. The motor 41 for driving the magneto-optical disk D is controlled by the microprocessor 20 via the drive control circuit 40 in both the recording and reproducing modes.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS. First, as shown by a solid line in FIG. 1, a D-1VT corresponding to the 525/60 system
A recording operation in the case where R1a and a dedicated interface 11a are connected to this method will be described.

In this case, the interface 11a is selected by the selector 12 under the control of the microprocessor 20, and the image data of the 525/60 system as shown in FIG. Is supplied to the encoder 31. In addition, in accordance with the selection of the interface 11a, dimensions (Px × Ln × Qv) of 525/60 system screen setting information and image data stored in a built-in memory (not shown).
Is taken into the microprocessor 20, and the microprocessor 20 sets a data block division sequence described below in the sequencer 36.

In the encoder 31, the aforementioned D-1
As with the VTR, four-channel processing is performed.
As shown in A and B, the pixels of each line are sequentially allocated to four channels. In this 4-channel distribution,
The luminance signal Y is processed independently, and the color signals Cr and Cb are combined and processed. As shown in FIG. 2C, the dimensions of the image data of each channel are determined by the luminance signal Y and the color signal Cr + C.
In both cases, the number of pixels per line Pxd is 180, and the number of lines Ln in the vertical direction is 500. If there are not enough pixels in this channel distribution, necessary dummy pixels are added as appropriate.

Next, as shown in FIGS. 3A and 3B, 10-bit pixels Pi to Pi + 3 of each line are arranged in series, and
The data is divided into bits and converted into a series of data Wi to Wi + 4. If a fraction is obtained in this conversion, dummy data is appropriately added so as to have 8 bits. Thereby, the dimension of the data per channel after the conversion is, as shown in FIG. 3C, the number of words per line W
c: 225, and the number of lines Ln in the vertical direction: 500.

Then, as shown in FIG. 3C, the video data of each channel after the conversion is, for example, three columns in the horizontal direction.
The block is divided vertically into five rows of blocks S11 to S53, and the dimensions of each block are the number of words (bytes) Wcd in the horizontal direction: 75 and the number of lines Lnd in the vertical direction: Lnd: 100. In this embodiment, 75 bytes in the horizontal direction are used as the minimum unit of the recording data, and each block is used as the minimum unit of the coding. ECC) is added. Inner code size: 75 bytes Outer code size: 100 bytes

To summarize the above series of processing, in this embodiment, video data of the 525/60 system is encoded as shown in Table 1 below.

[0026]

[Table 1]

In the above block division, generally,
The horizontal direction of the conversion data per channel is 60 to 12
The block size can be set by dividing it into n columns in the range of 0 bytes, and dividing it into m rows in the vertical direction in the same range of 60 to 120 lines. Is set to be minimum. Also, when emphasizing error correction capability,
With the block size specified (fixed), appropriate dummy data is supplemented.

The audio data is 1600 × 2 of channels A1 to A4 as shown in FIG.
The 4-bit data is distributed to each of the four channels (see FIGS. 2A and 2B), and the data size of the distributed channels becomes 1200 bytes as shown in FIG. 4A. The audio data of each channel after the distribution is rearranged two-dimensionally as shown in FIG.
It is divided into two blocks, and an error correction code is added to each block in the following size. Inner code size: 60 bytes Outer code size: 10 bytes

Further, in the encoder 31, shuffling,
Processing such as sync blocking is performed, and the encoder 31
Is supplied to the formatter 32. on the other hand,
The dimensions of each data block as shown in FIGS. 3 and 4 are set in the sequencer 37 by the microprocessor 20. In the formatter 32, the output data of the encoder 31 is processed according to the setting, and the data is reduced to a predetermined sector size. Correspondingly, a sector is formed by appropriately connecting the above code blocks by lcb.
The output of the formatter 32 is supplied to the optical head 33, and data is recorded on the disk D according to a predetermined format (details will be described later).

The size of a sector is appropriately set in advance in consideration of an editing unit, an access speed, and the like. In video data, one code block is one sector,
Since the audio data has a small code block, two code blocks in the frame are combined into one sector.

In the case of the 525/60 system (30 frames / second), the video data and audio data per frame have the following structures, respectively. The dimension data having the number of matrices and the sector length (Pxd × Ln × Qv, n × m × lcb) is set in the ID at the head of the sector and recorded. Y: 15 × 4 sector / frame; A1: 1 × 4 sector / frame Cr + Cb: 15 × 4 sector / frame; A2: 1 × 4 sector / frame (Key: 15 × 4 sector / frame); A3: 1 × 4 Sector / frame A4: 1 × 4 sector / frame

This data is written into the directory corresponding to the recording file after recording is completed, and is used together with the ID at the head of each sector as reference data for data reconstruction during reproduction. Also, when searching and jumping, this ID
Is referred to.

Next, the recording format of this embodiment will be described with reference to FIGS. 525/6
In the case of the 0 system, the video data of each channel has 15 sectors per frame as described above, and as shown in FIG. 5A, 15 sectors each having a sector ID are recorded in series. As shown in FIG. 2B, each sector is composed of an address part ADRS and a data part DATA.

As shown in FIG. 3C, the data portion DATA is provided between the preamble PA and the edit gap EG.
A synchronization pattern SYNC, a data mark DM, a time code user bit TC / UB, an error detection code CRC,
Data DATA is inserted in series. Further, the data DATA is composed of a repetition of a synchronization pattern SYNC, a sector address + synchronization address ID, and data DATA, as shown in FIG. The size of each component is, for example, as follows. PA, EG: 30 bytes; SYNC, CRC, ID: 2 bytes DM: 1 byte; TC / UB: 8 bytes

As shown in FIG. 6B, the address part ADRS includes a synchronization pattern SYNC, address marks AM and I between the preamble PA and the edit gap EG.
D, an address ADDRESS, and an error detection code CRC are inserted in series. As shown in FIG. 4C, the ID is a track ID (TRK-ID), a channel ID (CH-ID), and the dimension data as described above, that is, the number of line samples Pxd and the number of lines L.
n, the number of quantizations Qv, the number of rows m of the code block, the number of columns n,
It comprises a sector length lcb. Also, the address ADD
The RESS is composed of a hardware address (track number) HARD-ADRS, a frame number FRAME-ADRS, and a sector address SECTOR-ADRS for each frame, as shown in FIG. The size of the part unique to the address part ADRS is, for example, as follows. AM, TRK-ID, CH-ID: 1 byte n, m, lcb: 1 byte HARD-ADRS, FRAME-ADRS: 2 bytes SECTOR-ADRS: 1 byte

Next, as shown by the solid line in FIG.
D-1 VTR1a and interface 11 compatible with 60 systems
The reproduction operation of this embodiment when a is connected will be described.

At the time of reproduction, contrary to the time of recording, the optical head 3
3 is supplied to the separator 34, and is reconstructed into a code block as shown in FIG. 3C according to the ID reproduced at the same time. At this time, the dimension data of the constituent blocks as described above is taken into the microprocessor 20, and the microprocessor 20 sets the data block reconstructing sequence, which is the reverse of the division, in the sequencer 36.

In the decoder 35, the separator 34
The video data and the audio data as shown in FIGS. 7 and 8 are reconstructed from the output data through the intermediate stages as shown in FIGS. Then, the selector 12 is also selected according to the ID of the reproduction signal, and the video data and the audio data from the decoder 35 are supplied to the D-1 VTR 1a via the corresponding interface 11a.

In the case of the 625/50 system (25 frames / second), at the time of recording, video data is encoded as shown in Table 1 by the same processing as described above. In this case, since the amount of data per frame is large, the video data has the same block size as that of the 525/60 system and has three columns.
It is divided into six lines.

As shown in parentheses in FIG. 4A, the audio data has a data size of 1440 bytes for each channel after distribution. The audio data after the distribution is rearranged two-dimensionally as shown in FIG.
It is divided into two blocks, and an error correction code is added to each block in the following size. Inner code size: 60 bytes Outer code size: 8 bytes

The video data and audio data per frame have the following configurations. Y: 18 × 4 sector / frame; A1: 1 × 4 sector / frame Cr + Cb: 18 × 4 sector / frame; A2: 1 × 4 sector / frame (Key: 18 × 4 sector / frame); A3: 1 × 4 Sector / frame A4: 1 × 4 sector / frame

When recording a still image in the HD system,
By the same processing as described above, the video data is encoded as shown in Table 1 above. The video data per frame has the following configuration. Y: 30 × 4 sectors / frame; Pr, Pb: 15 × 4 sectors / frame

In this case, in consideration of the fact that there is no demand for the access speed, the number of code blocks per sector is set to lcb: 4, and the sector size is set to be relatively large. Also, Pr and Pb are allocated to separate sectors.

As described in detail above, in this embodiment, an appropriate number and length of recording sectors are set in accordance with the number of pixels constituting an image of each television system. Is recorded digitally, so that video signals of a plurality of systems can be recorded and reproduced on a common medium using a common device regardless of the number of pixels constituting the image, and real-time Video editing is possible. Further, images of different sizes in different formats can be efficiently handled on a common image file, data can be easily exchanged with a computer, and application to ME and CG can be simplified. Furthermore, on the manufacturing side, a large number of systems can be dealt with by a common device, so that significant cost reduction is possible.

The present invention can be applied to both moving pictures and still pictures. Further, only one type of image may be recorded in one medium, or images of different sizes may be mixed and recorded. As for the recording format, directories and sub-directories can be provided and managed in a so-called tree structure, similarly to a normal computer disk.

[0046]

As described in detail above, according to the present invention,
According to the number of constituent pixels of the image of each system, an appropriate number and length of recording sectors are set, and a video signal of a frame unit is digitally recorded in this sector, irrespective of the number of constituent pixels of the image. Thus, a digital video signal recording or reproducing device capable of digitally recording or reproducing a plurality of types of video signals on a common medium using a common device is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a digital video signal recording or reproducing apparatus according to the present invention.

FIG. 2 is a conceptual diagram for explaining the operation of one embodiment of the present invention.

FIG. 3 is a conceptual diagram for explaining the operation of one embodiment of the present invention.

FIG. 4 is a conceptual diagram for explaining the operation of one embodiment of the present invention.

FIG. 5 is a conceptual diagram for explaining the operation of one embodiment of the present invention.

FIG. 6 is a conceptual diagram for explaining the operation of one embodiment of the present invention.

FIG. 7 is a conceptual diagram for explaining the present invention.

FIG. 8 is a conceptual diagram for explaining the present invention.

FIG. 9 is a conceptual diagram for explaining the present invention.

[Explanation of symbols]

 11a, 11b @ 11n Interface 12 Selector 20 System Control Circuit (Microprocessor) 31 Encoder 32 Formatter 33 Optical Head 34 Separator 35 Decoder 36, 37 Sequencer D Magneto-optical Disk

Claims (2)

(57) [Claims] 1. A digital video signal recording apparatus for recording digital video signals of a plurality of standard systems on a medium, comprising: a plurality of interface means for supplying digital video signals corresponding to the plurality of standard systems, respectively; Selection means for selecting one of the plurality of interface means; storage means for storing the screen setting information of the plurality of standard methods; and identification of the screen setting information corresponding to the interface means selected by the selection means Encoding means for forming a plurality of code block data from a screen-based digital video signal supplied via the selected interface means, based on the screen setting information of the reference system, Recording data forming means for forming recording data by arranging in order. Digital video signal recording apparatus. 2. A digital video signal reproducing device for reproducing data recorded on a medium and outputting a digital video signal, comprising: a plurality of interface means respectively corresponding to a plurality of standard systems; Selecting means for selecting one; reproducing data separating means for separating a plurality of code block data arranged in a predetermined order in data reproduced from the medium; and storing the screen setting information of the plurality of standard methods Based on screen setting information of a specific reference method corresponding to the interface means selected by the selecting means from among the screen setting information, a screen of the specific standard method from a plurality of sorted code block data. Decoding means for forming a digital video signal of a unit, and outputting the output of the decoding means to the selected interface. A digital video signal reproducing device, wherein the digital video signal is supplied to a face means.