JPH0946628A - Video signal recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record increased lines without considerable revamping by replacing data representing an increased active video area with auxiliary data and recording the resulting data to at least part of an auxiliary data area. SOLUTION: An active video area coder 103 selectively extract only data representing an active area from an entire digital video signal received by a terminal 101, applies high efficiency coding to the data and the result is outputted to a recorder 106. An additional video area coder 104 selectively extracts only data representing an additional video area and applies high efficiency coding to the data and outputs the result to a replacement device 105. The processing above is executed by storing a received data stream to a buffer memory at once and extracts only the data stored in a prescribed area. The replacement device 105 replaces part of data given from the data input terminal 102 with output data from the additional video area coder 104 and outputs the resulting data to the recorder 106.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording device for recording a video signal.

[0002]

2. Description of the Related Art Generally, in a video signal recording apparatus which records a digitized video signal with high efficiency coding, only data representing an active video area of an input video signal is high efficiency coded to obtain video auxiliary data. (For example, information data indicating information such as an identification signal for an input video signal and character information) is recorded on a magnetic tape.

FIG. 10 is a block diagram of a video signal recording apparatus according to the prior art. Reference numeral 1001 denotes a video input terminal for inputting a video signal, 1002 denotes an information input terminal for inputting video auxiliary data for the input video signal, 10
03 is an active video area encoder for highly efficient encoding only the active video area of the input video signal,
Reference numeral 1004 denotes a recorder for recording high-efficiency coded data and video auxiliary data, and 1005 denotes a magnetic tape.

The operation of the video signal recording apparatus having the above configuration will be described. The video signal input from the video input terminal 1001 is output to the recorder 1004 after high-efficiency encoding only the data representing the active video area of the input video signal by the active video area encoder 1003. The recorder 1004 recorded the video auxiliary data from the information input terminal 1002 and the high efficiency coded data from 1003 on the magnetic tape 1005.

[0005]

However, according to the prior art, when the number of active effective lines of the input video signal is increased, recording the data representing the increased lines increases the number of tracks to be recorded, or This results in an increase in the compression rate for recording on the same number of recording tracks.
In either case, the video signal recording device according to the prior art has a problem that the increased lines cannot be recorded without a significant change in the configuration.

The video signal recording apparatus of the present invention has been made in order to solve the above problems, and its purpose is to increase by increasing the number of lines, etc., by slightly changing the conventional video signal recording apparatus. Another object of the present invention is to provide a video signal recording device capable of recording data representing the active video area.

[0007]

A video signal recording apparatus according to the present invention is a video signal recording apparatus for recording a digital video signal on a track having a video data area and an auxiliary data area on a magnetic medium. The digital video signal is recorded in at least a part of the auxiliary data area, whereby the above object is achieved.

In one embodiment, the digital video signal recorded in at least a part of the auxiliary data area corresponds to data representing an additional video area which is an area other than the active video area.

In one embodiment, a first encoder for receiving first data representative of the active video area and high efficiency encoding to produce compressed first data, and a first encoder representative of the additional video area. A second encoder for receiving two data and highly efficient encoding to generate second data compressed, and recording the first compressed data and the second compressed data on the magnetic medium And a recording device that

In one embodiment, an encoder that receives data representative of the active video area and the additional video area and produces compressed data by high efficiency encoding the encoded data and the encoder. A recording device for recording on a medium.

In one embodiment, a first encoder that receives the first data representing the active video area and efficiently compresses the first data to generate the compressed first data, and the compressed first data. And a recorder for recording second data representing the additional video area on the magnetic medium.

In one embodiment, the auxiliary data area is
This is an area where video auxiliary data is recorded.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The same reference numerals in the drawings denote the same components.

(Embodiment 1) FIG. 1 is a block diagram of a first embodiment of a video signal recording apparatus of the present invention. The video signal input terminal 101 receives a digital video signal. This video signal is a digital signal that represents the pixels that make up a frame or field.
-R Rec. It is a 4: 2: 2 component signal conforming to 601.

Active video area encoder 103
Receives data representing an active video area in the digital video signal input to the video signal input terminal 101, and performs high-efficiency coding. Here, the "active video area" refers to an area that is actually displayed on the screen of the display device. This active video area is, for example, in the digital VTR standard,
"Specifications o" by the HD Digital VCR Council
f Consumer-Use Digital VCRs "(December 1994) (For simplicity, hereinafter referred to as" home digital VTR standard ")
It is defined in Part 2 of That is, in the “525/60 system”, the active video area includes the first field including the 23rd to 262th lines (240 lines in total) and the second field including the 285th to 524th lines (240 lines in total). And fields. In the present specification, the 525/60 system will be described as an example, but the present invention is not limited to the 525/60 system. For example, "6
25/50 system ”, in which case the active video area includes the first field consisting of the 23rd line to the 310th line (288 lines in total) and the 3rd line.
The second field is composed of 35th line to 622nd line (288 lines in total). In any of the above systems, the number of horizontal pixels is 720.

The additional video area encoder 104 is a data representing a pixel (in this specification, "additional video area") other than the active video area in the digital video signal input to the video signal input terminal 101. Is received, and high efficiency encoding is performed. The additional video area is a portion other than the active video area described above, and is an area represented by a line excluding the line corresponding to the vertical blanking period. The line number corresponding to the vertical blanking period varies depending on the standard.
As an example, CCIR Rec. The lines defined at 656 are listed below. That is, the additional video area in the 525/60 system is 20 lines of lines 1 to 10 and lines 264 to 273, and is 625/5.
Additional video areas in the 0 system are lines 1-2
3, lines 311 to 336, and lines 624 to 62
It is 51 lines of 5.

FIG. 2 is a diagram showing a first field and a second field in the 525/60 system. 5
In the 25/60 system, the first field and the second field are the active video area.

The high-efficiency coding scheme performed by the active video area encoder 103 and the additional video area encoder 104 is intraframe coding, which achieves about 1/5 data compression.

The video auxiliary data input terminal 102 receives digital video auxiliary data. This video auxiliary data is digital data other than video signals,
For example, video auxiliary data (Video AUXiliary dat) defined by the above-mentioned home digital VTR standard.
a, VAUX). In this standard, video auxiliary data VAUX is VITC (Vertical Interval Ti
me Code) and information about the recorded video signal. The information about the video signal includes, for example, a television broadcast channel to be recorded, a color frame type, a 525/60 system type or a 625/50 system type, a recording mode, a screen aspect ratio, an interlaced scan or a progressive scan. Type, date of recording,
There are recording times and so on.

The replacing unit 105 replaces the video auxiliary data input to the video auxiliary data input terminal 102 with the data representing the additional video area. The replacer 105 is
As will be understood by those skilled in the art, it can be configured by, for example, a memory and a memory controller that controls the memory.

The recorder 106 outputs high-efficiency-encoded digital data representing the active video area output from the active video area encoder 103 and high-efficiency encoding representing the additional video area output from the replacer 105. The generated digital data is received, a signal suitable for recording on the magnetic tape 107 is generated, and the generated signal is recorded on the magnetic tape 107. The recorder 106 is E
It has a functional block that performs CC (error correction code) addition, shuffling, equalizing, and the like on input digital data, and a magnetic head that writes data on the magnetic tape 107.

The magnetic tape 107 is a tape having a tape width of 6.35 mm used in a home digital VTR in the embodiment of the present specification.

The operation of the video signal recording apparatus of FIG. 1 will be described below. FIG. 3 is a diagram showing an active video area and an additional video area represented by an input video signal, and a macro block corresponding to each area. Of FIG.
In this specification, as shown in (a), the video signal input terminal 1
The digital video signal input to 01 has an active video area of 720 pixels horizontally and 480 pixels vertically and 72 horizontal pixels.
It is composed of an additional video area of 0 pixels and 6 pixels vertically.

Active video area encoder 103
Receives a digital video signal representing the entire active video area and the additional video area, selectively outputs only the data representing the active video area, to the recorder 106 by selectively high-efficiency coding. The additional video area encoder 104 receives a digital video signal representing the whole of the active video area and the additional video area, and selectively high-efficiency-encodes only the data representing the additional video area and outputs it to the replacer 105.
In this way, selective high-efficiency coding of only data representing a specific area can be realized as follows.
That is, the input data stream is temporarily stored in a buffer memory, and then only the data stored in a predetermined memory area is taken out to transfer only part of the input data to a block for high-efficiency encoding. it can.

Active video area encoder 103
Performs high-efficiency coding on an area of 720 pixels in the horizontal direction and 480 pixels in the vertical direction in units of macroblocks of 32 pixels in the horizontal direction and 8 pixels in the vertical direction. Therefore, as shown in FIG. 3B, the active video area has 22.5 macroblocks horizontally and 6 columns vertically.
It is divided into 1350 macroblocks of 0 macroblocks, high-efficiency coded, and output to the recorder 106.

The additional video area encoder 104 is shown in FIG.
By adding dummy data for 2 lines to an area of 720 pixels horizontally and 6 pixels vertically, which is the additional video area shown in (a), as shown in (b) of FIG. , 1 vertical macroblock is encoded with high efficiency,
Output to the recorder 106.

The replacing unit 105 replaces the output data from the additional video area encoder 104 in place of at least a part of the data input from the video auxiliary data input terminal 102, and outputs it to the recording unit 106. . Here, all the data from the video auxiliary data input terminal 102 may be replaced by the data from the additional video area encoder 104.

The recorder 106 receives the compressed data output from the active video area encoder 103 and the compressed data output from the replacer 105, and generates a sync block to be recorded on the magnetic tape 107. Then, the data is recorded on the magnetic tape 107.

FIG. 4 is a diagram showing the arrangement of tracks and sync blocks recorded on the magnetic tape 107 corresponding to one frame of data. 52 as mentioned above
Since the 5/60 system is taken as an example, the data corresponding to one frame is recorded on 10 tracks.
In the 625/50 system, recording is performed on 12 tracks.

On each track 46, digital data is recorded in the form of 138 sync blocks. The 138 sync blocks on one track are
According to the home digital VTR standard, 135 sync blocks (recorded in the area 40) for recording video data and three sync blocks (areas 42 and 44) for recording video auxiliary data (VAUX). It will be recorded in) and. Therefore, sync blocks recorded on 10 tracks are classified into 1350 sync blocks for video data and 30 sync blocks for video auxiliary data.

FIG. 5 is a diagram showing a sector arrangement of recording tracks on the magnetic tape 107. Each track of FIG. 4 has an ITI sector (“ITI”) as shown in FIG.
), An audio sector (indicated by “AUDIO”), a video sector (indicated by “VIDEO”), and a subcode sector (indicated by “SUB-CODE”).
The respective sectors are separated by edit gaps G1 to G3. A margin (indicated by "OM") for overwriting is provided at the end of the subcode sector on the side opposite to the edit gap G3. Tracking information at the time of insert editing and position information of each sector are recorded in the ITI sector. The audio sector is
Audio data area, audio auxiliary data (AAU
X) area etc. are included. The video sector includes a video data area, a video auxiliary data (VAUX) area, etc. as described later. SMPTE / EBU in the subcode sector
Tape management information such as a time code compliant with is recorded.

FIG. 6 is a diagram showing the video sector shown in FIG. 5 in more detail. The data shown in FIG. 6 corresponds to a video sector (“VIDE in FIG. 5” in one track 46 in FIG.
(Area indicated by “O”). The numbers in the horizontal direction (that is, 0 to 89) in FIG. 6 indicate byte positions, and the numbers in the vertical direction (that is, 17 to 168).
Indicates the sync block number.

The seventeenth and eighteenth sync blocks in FIG. 6 are pre-sync blocks, and the area 42 in FIG.
Corresponds to the area above. The nineteenth and twentieth sync blocks are sync blocks including video auxiliary data 62 and correspond to the area 42 in FIG. The 21st to 155th sync blocks are sync blocks including the video data 60 and correspond to the area 40 in FIG. 4.
The 156th sync block is a sync block including the video auxiliary data 64 and corresponds to the area 44 in FIG. The 157th to 168th sync blocks correspond to the area below the area 44 in FIG. 4. The video data 60 and the video auxiliary data 62 and 64 include an inner parity 66, an outer parity 68, and data Syn.
c, the data ID is added.

In the first embodiment, 1350 macroblocks representing the active video area are 135
0 sync blocks are recorded in the video data area 60, and 22.5 macro blocks representing an additional video area are recorded in the video auxiliary data areas 62 and 64. Originally video auxiliary data areas 62 and 64
Since 30 macroblocks can be recorded in,
An area corresponding to 5 macroblocks remains. In the remaining area, data of the video auxiliary data that the user wants to record can be recorded.

Therefore, according to the present invention, when it becomes necessary to record the information of the additional video area which is not included in the active video area, the same components as those of the conventional recording apparatus are used without increasing the circuit scale. Such recording becomes feasible. For example, the present invention provides the advantage that a studio standard video signal can be recorded by a home VTR. This is because the active video area of the studio standard video signal is, for example, 6 lines larger than the area that can be recorded by the conventional home VTR.

The video auxiliary data areas 62 and 64 are
It is located adjacent to the video data area 60. First
In the embodiment of
Recording on the tape and reproduction from the tape can be realized with a simple circuit configuration. In addition, 1 macroblock is
It corresponds to one sync block, and as a result of compressing data of one macro block, one sync block is recorded on the tape.

However, according to the present invention, the data representing the additional video area may be recorded in a region other than the video auxiliary data area. In other words, according to the present invention, a recording area other than the video data area, that is, an area including the above-mentioned ITI sector, audio sector, subcode sector, etc. is called an "auxiliary data area", and data representing an additional video area is It will be understood that it is enough to record in the auxiliary data area.

The first embodiment of the video signal recording apparatus of the present invention records the data representing the additional video area in the video auxiliary data area on the magnetic tape. As a result, it is possible to record a frame composed of more lines by using the same configuration as that of the recording device according to the related art.

The format of the input video signal is
The video signal is not limited to the 4: 2: 2 video signal described above, and may be, for example, a high-definition television signal or a progressive scanning signal.

The coding schemes of active video area encoder 103 and additional video area encoder 104 may be different.

(Embodiment 2) FIG. 7 is a block diagram of a second embodiment of the video signal recording apparatus of the present invention. The second embodiment has the same configuration as the first embodiment except that the encoder 703 functions as the active video area encoder 103 and the additional video area encoder 104. Therefore, detailed description of the same components as in the first embodiment will be omitted.

The encoder 703 has a video signal input terminal 1
At 01, data representing a frame constituted by the active video area and the additional video area shown in (a) of FIG. 3 is received. The encoder 703 divides this data into 1372.5 macroblocks and then
Performs high efficiency encoding. Of the compressed data, the encoder 703 outputs the data corresponding to the active video area to the recorder 106, and outputs the data corresponding to the additional video area to the replacer 105.

Similar to the first embodiment, 1350 macro blocks representing the active video area are recorded as 1350 sync blocks in the video data area, and 22.5 macro blocks representing the additional video area are recorded. , 30 sync blocks are recorded in a part of the recordable video auxiliary data area.

In addition to the effect of the first embodiment, the second embodiment has an effect that the circuit scale of the encoder can be reduced because the two encoders are integrated.

As in the first embodiment, the format of the input video signal may be another format.

(Third Embodiment) FIG. 8 is a block diagram of a third embodiment of the video signal recording apparatus of the present invention. The third embodiment has the same configuration as that of the first embodiment except that the replacer 805 replaces the data representing the additional video area that is not high-efficiency coded with the video auxiliary data. Therefore, only the components different from the first embodiment will be described.

The replacer 805 receives the data representing the active video area and the additional video area at the video signal input terminal 101, and the data representing the additional video area of the received data is input to the video auxiliary data input terminal 102. Replace the video auxiliary data. The operation after the recorder 106 is the same as that of the first embodiment.

In the third embodiment, no encoder is used for highly efficient coding of the data representing the additional video area. Therefore, there is an effect that the circuit scale of the encoder can be reduced.

As with the first embodiment, the format of the input video signal may be another format.

A method for actually realizing the video signal recording devices of the first to third embodiments will be described below. FIG.
FIG. 6 is a diagram for explaining a method of realizing the video signal recording device of the present invention. First, a method for realizing the video signal recording apparatus of the first embodiment with the configuration of FIG. 9 will be described. C
The PU 90 controls the flow of video data via the data bus 99 and also controls each component. The I / O unit 91 receives the data representing the active video area and the data representing the additional video area, and outputs the data to the memory 93. The memory 93 receives and stores data representing the active video area and data representing the additional video area. Encoders 95 and 96 respectively retrieve the data representing the active video area and the data representing the additional video area from the memory 93 and encode them. The I / O unit 92 receives the video auxiliary data and outputs it to the memory 94.

First, the CPU 90 controls the encoder 95 and the memory 97 so that the data representing the active video area is written in the memory 97 via the data bus 99. The CPU 90 then controls the memories 94 and 97 so that the video auxiliary data is written into the remaining space of the memory 97 via the data bus 99. Finally, the CPU 90 overwrites the memory space for replacing the data in the video auxiliary data with the data representing the additional video area output from the encoder 96. By the operation as described above, the replacer 1 in the first embodiment
05 can be realized.

The ECC 98 stores in the memory 97 the data to be actually recorded among the data representing the active video area, the data representing the additional video area and the video auxiliary data.
Then, the data is recorded on the magnetic tape 107 after the error correction code is added.

In the second embodiment, either one of the encoders 95 and 96 is used.
In the third embodiment, by bypassing the encoder 96, the data representing the additional video area is output on the data bus 99 without high efficiency encoding. As described above, with the circuit configuration shown in FIG. 9, the first to third embodiments can be flexibly realized.

In the above embodiment, the data representing the additional video area is recorded in the video auxiliary data area. However, the present invention is not limited to this. For example, the data representing the additional video area may be recorded in the video data area, and the data representing the active video area may be recorded in the entire video auxiliary data area.

[0055]

According to the video signal recording apparatus of the present invention, at least the following effects can be obtained. That is, the video signal recording apparatus of the present invention has the same configuration as the video signal recording apparatus according to the conventional technique, but can record the data representing the frame composed of more lines than the conventional one on the magnetic tape.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of a video signal recording apparatus of the present invention.

FIG. 2 is a diagram showing a first field and a second field in a 525/60 system.

FIG. 3 is a diagram showing an active video area and an additional video area represented by an input video signal, and a macro block corresponding to each area.

FIG. 4 is a magnetic tape 10 corresponding to one frame of data.
7 is a diagram showing an arrangement of tracks recorded on the No. 7 and sync blocks. FIG.

5 is a diagram showing a sector arrangement of recording tracks on the magnetic tape 107. FIG.

FIG. 6 shows the video sector shown in FIG. 5 in more detail.

FIG. 7 is a block diagram of a second embodiment of the video signal recording device of the present invention.

FIG. 8 is a block diagram of a third embodiment of the video signal recording device of the present invention.

FIG. 9 is a diagram for explaining a method of realizing the video signal recording device of the present invention.

FIG. 10 is a block diagram of a conventional video signal recording device.

[Explanation of symbols]

 101 Video Signal Input Terminal 102 Video Auxiliary Data Input Terminal 103 Active Video Area Encoder 104 Additional Video Area Encoder 105 Replacer 106 Recorder 107 Magnetic Tape

Claims (8)

[Claims] 1. A video signal recording apparatus for recording a digital video signal on a track having a video data area and an auxiliary data area on a magnetic medium, wherein the digital video signal is at least partly included in the auxiliary data area. Video signal recording device for recording. 2. The video signal recording apparatus according to claim 1, wherein the digital video signal recorded in at least a part of the auxiliary data area corresponds to data representing an additional video area which is an area other than an active video area. . 3. A first representing the active video area
A first encoder for receiving data and generating first data compressed by high efficiency encoding; a first encoder for receiving second data representing the additional video area and compressing the second data by high efficiency encoding; The video according to claim 2, comprising a second encoder for generating two data, and a recorder for recording the compressed first data and the compressed second data on the magnetic medium. Signal recorder. 4. An encoder for receiving data representative of said active video area and said additional video area and producing compressed data by high efficiency coding, said compressed data on said magnetic medium. The video signal recording apparatus according to claim 2, further comprising: a recorder for recording. 5. A first representing the active video area
A first encoder for receiving data and producing high efficiency encoded first data to produce compressed first data; and the compressed first data and second data representing the additional video area on the magnetic medium. The video signal recording apparatus according to claim 2, further comprising: a recorder for recording. 6. The video signal recording apparatus according to claim 3, wherein the auxiliary data area is an area in which video auxiliary data is recorded. 7. The video signal recording apparatus according to claim 4, wherein the auxiliary data area is an area in which video auxiliary data is recorded. 8. The video signal recording apparatus according to claim 5, wherein the auxiliary data area is an area in which video auxiliary data is recorded.