JP3085643B2 - Digital signal recording 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 signal recording apparatus for recording digital signals such as video and audio. More specifically, the present invention relates to a digital signal recording apparatus provided with a standard recording mode and a long-time recording mode in which recording can be performed on the same recording medium for a longer time than in the standard recording mode.

[0002]

2. Description of the Related Art In recent years, as the image quality and the digitalization of video equipment have been advanced, the next-generation V
Digital VCRs have attracted attention as CRs. Here, in a home digital VCR, since it is necessary to perform recording on a small cassette for a long time, it is necessary to introduce a high efficiency coding technique for reducing the amount of information of a video signal without a large deterioration in image quality. Regarding the format of home digital VCR using high efficiency coding, HD digital VCR
The CR Council announced in August 1993, “Basic specifications for Consu
mmer-Use Digital VCR) ". This DVCR, RE
This is to record the current television signal conforming to the C601 standard on a magnetic tape at a video data rate of 25 Mbps.

[0003] The operation of this DVCR will be briefly described below. The input current television signal is a digital signal as it is, an analog signal is subjected to A / D conversion, and then a luminance (Y) signal, a first color difference (RY) signal, and a second The color difference (BY) signal is filtered such that the ratio of the number of samples in the horizontal direction is 4: 1: 1. Thereafter, signal rearrangement and, if necessary, predetermined video signal processing such as compression processing are performed and output as video data. At this time, important data, such as whether the input video is in the NTSC format or the PAL format, which makes it impossible to reproduce the video data if lost, is collectively used as auxiliary data. The auxiliary data is inserted into video data. After that, error correction coding is performed, and modulation suitable for magnetic recording is performed by a modulator, converted into a recording signal, and recorded on a magnetic tape. According to the basic specification of the consumer digital VCR, in the case of an NTSC television signal, one frame is divided into ten tracks and recorded.

[0004] In a general DVCR, a track is composed of a predetermined number of sectors and gaps between the sectors, and a sector is composed of a predetermined number of sync blocks, run-ups, guards, and the like. Each of the sectors is allocated to tracking information, audio data, video data, subcode data, and the like. The auxiliary data is allocated to the same sector as the audio data and the video data and inserted.

On the other hand, it is generally considered essential for a video signal recording device to be capable of editing one field or one frame at a time. Therefore, not only video data and audio data but also subcode data and auxiliary data are stored in one field. Alternatively, they are compiled for each frame and can be edited. The address is made up of a field address for identifying a field, a track address having a cycle of one field, and a block address having a cycle of one track so that the address can be used. Alternatively, the address is replaced with a frame address for identifying the frame, and 1
A track address having a cycle of a frame and a block address having a cycle of one track may be used.

For the auxiliary data, see “Japanese Patent Application No. 6-38.
No. 248 digital signal recording / reproducing method ”, in order to avoid the effects of magnetic tape burst errors and scratches, and in consideration of the ease of data acquisition during special reproduction, track by track. And record it periodically and repeatedly in different locations within

[0007]

The current VHS
In the VTR of the system, as a recording mode, in addition to the standard recording mode, a triple recording mode capable of recording three times as long as the standard recording mode on the same tape is set. Accordingly, there is a strong need for a home digital VCR not only in the standard recording mode but also in a long recording mode capable of recording for a longer time than the standard recording mode.

A long-time recording mode in a digital VCR using high-efficiency coding is described in, for example, Japanese Patent Laid-Open No. 5-13838.
No. 69, "Digital Video Signal Recording Apparatus". In the contents disclosed in the above publication, the ratio of the number of samples of the luminance signal between the standard recording mode and the long-time recording mode is 3: 2. But then, for example,
When the sampling frequency of the luminance signal in the standard recording mode is 13.5 MHz, the bandwidth of the luminance signal in the long-time recording mode is 9 MHz, which is inferior in resolution to the conventional analog S-VHS. In addition, REC601
According to this, in a home digital VCR, the sample ratio of the luminance signal, the first color difference signal, and the second color difference signal is 4: 1: 1 in the standard recording mode of the current TV signal. At this time, assuming that the sampling frequency of the luminance signal in the long-time recording mode is 2/3 of the standard recording mode, the sample ratio becomes (8/3): 1: 1, and the circuit is shared with the standard recording mode due to blocking or the like. It becomes quite difficult.

Further, if the same block address configuration as that in the standard recording mode is used in the long recording mode, a problem arises in that the frame address cannot be specified correctly. Also, when trying to record a signal in the standard recording mode and a signal in the long-time recording mode on the same tape in a mixed manner, the insertion of the auxiliary data from the head track of the frame is started in the same manner. The periodicity of the data insertion position is not maintained, and during reproduction, an auxiliary data detection error occurs immediately after passing the boundary between the signal recording area in the standard recording mode and the signal recording area in the long time recording mode, The algorithm for detecting the position of the auxiliary data becomes more complicated, so that the circuit scale increases and the delay amount of the detection time increases.

Whether the reproduced data is based on the standard recording method or the long-time recording method can be known only by examining the contents of the auxiliary data. However, the reproduction process is performed assuming that the signal is a standard recording signal, and there is a risk that a large breakdown may occur on a reproduction screen.

In addition to the current standard TV signal, HDTV
Practical use of signals and wide-screen 16: 9 TV signals has also started in earnest.
There is a need to be able to record signals with one VTR.
However, between the standard TV signal recording format and the HDTV signal recording format, signal processing after variable length coding and sharing of a recording head and the like are possible, but other portions, for example, the current TV signal is one segment. In contrast to the 6 blocks × 5 = 30 blocks per segment, the HDTV signal has a difference of 8 × 5 = 40 blocks per segment, so it is difficult to share the circuit. Each TV
Having an independent circuit for signals directly leads to an increase in cost, which is a fatal drawback for household equipment.

In view of the foregoing, it is an object of the present invention to provide a digital signal recording apparatus having a long-time mode capable of recording on a recording medium for a longer time than in the standard recording mode.

[0013]

A digital signal recording apparatus according to the present invention comprises a luminance signal, a first chrominance signal, and a second chrominance signal.
Recording device for recording a video signal containing
A mode setting section for setting a recording mode;
Recording mode is longer than the standard recording mode and the standard recording mode
One of the long recording modes with recording time
Set by the mode setting unit and the recording mode setting unit
The luminance signal with the number of samples corresponding to the set recording mode.
And the first color difference signal and the second color difference signal are sampled.
A sampling unit which is used in the standard recording mode.
The number of samples of the luminance signal and the number of samples of the first color difference signal
And the number of samples of the second color difference signal is 4: 1: 1.
Sample of the luminance signal in the long time recording mode
The number is a sample of the luminance signal in the standard recording mode.
／ Of the number and the first in the long-time recording mode.
The number of samples of the color difference signal is the same as that in the standard recording mode.
It is 1/2 of the number of samples of the first color difference signal,
The number of samples of the second color difference signal in the recording mode is
One of the number of samples of the second color difference signal in the quasi-recording mode
/ 2, the sampling unit and the standard recording mode.
And the luminance signal, the first color difference signal, and the second color difference signal
A first macroblock including a ratio of 4: 1: 1 is generated.
The luminance signal and the first color difference signal in a long time recording mode
And a second macro including the second color difference signal at a ratio of 6: 1: 1.
A macroblock generation unit for generating a block;
And the amount of encoded data corresponding to the
The amount of encoded data corresponding to the
The first macroblock and the second macroblock
Generate encoded data by encoding blocks
Encoding unit for recording the encoded data on a recording medium
A recording unit is provided , whereby the object is achieved.

[0014] The sampling unit is configured to set the recording mode.
The sun corresponding to the recording mode set by the
The luminance at which the luminance signal is sampled at the pulling frequency
A signal sampling unit may be included.

The sampler in the standard recording mode
The switching frequency is 13.5 MHz, and
The sampling frequency in the network is 10.125 MHz.
There may be.

The sampling section sets the recording mode.
Predetermined according to the recording mode set by the
In a frequency band greater than the frequency of
The luminance signal sampled by the sampling unit
May be further included.

The sampling unit is configured to set the recording mode.
According to the recording mode set by the setting unit.
1 Determine whether to perform line thinning for the color difference signal
The first line thinning unit and the recording mode setting unit
The second color difference signal according to the recording mode set
A second line that determines whether to perform line thinning for
A thinning unit may be included.

The recording mode setting section sets the
Sampling the luminance signal according to a recording mode
Features include a rate converter that converts the rate
It may be.

The sampling section is configured to set the recording mode.
Predetermined according to the recording mode set by the
The rate conversion in a frequency band greater than
Suppressing the gain of the luminance signal converted by the unit.
It may be characterized by further including a pressure part.

[0020]

Another digital signal recording apparatus according to the present invention comprises:
When the number of horizontal effective pixels of the video signal is not an integral multiple of the number of horizontal pixels of the macroblock, or when the number of vertical effective pixels of the video signal is not an integral multiple of the number of vertical pixels of the macroblock, What is claimed is: 1. A digital signal recording apparatus for recording on a recording medium, comprising: a dividing unit for dividing a video signal into a plurality of macroblocks; Determining means for determining whether or not it corresponds to the remainder of the effective pixels; generating means for generating a pseudo macroblock having a predetermined pixel value; and dividing by the dividing means according to a result of the determination by the determining means. Selecting means for selecting one of the macro block and the pseudo macro block generated by the generating means;
Encoding means for encoding the macroblock selected by the selecting means; and recording means for recording the video signal encoded by the encoding means on a recording medium, thereby achieving the above object. Is done.

[0022] All the pixel values of the pseudo macroblock generated by the generating means may be equal.

[0023] The pseudo macro block generated by the generation means may include a plurality of small blocks, and the pixel value of the pseudo macro block may be different for each of the small blocks.

Another digital signal recording apparatus according to the present invention comprises:
What is claimed is: 1. A digital signal recording apparatus for recording a digital signal on a recording medium, comprising: mode setting means for setting a recording mode, wherein the recording mode includes a standard recording mode and a long recording mode in which a recording time is longer than the standard recording mode. And a coding means for coding a signal with a data amount corresponding to the recording mode set by the mode setting means, wherein the recording mode is a long time recording mode. The data amount in a certain case is smaller than the data amount when the recording mode is the standard recording mode, and the data encoded by the encoding unit according to the recording mode set by the mode setting unit. has an auxiliary data adding means for adding auxiliary data, and recording means for recording the data added to the auxiliary data on the recording medium, the Auxiliary data adding means, the mode setting
Auxiliary data according to the recording mode set by
Data generating means for generating data, and the mode setting means
The auxiliary data according to the recording mode set by
Control means for generating a control signal indicating the insertion position of the
At the insertion position indicated by the control signal, the auxiliary data
Data insertion for inserting data into the encoded data
Means for inserting the auxiliary data,
When the recording mode is the long-time recording mode and the recording mode
Regardless of whether or not is in the standard recording mode,
Control means so that the periodicity of the data insertion position is maintained.
Therefore, it is controlled, whereby the above object is achieved.

[0025]

When the recording mode is the standard recording mode, the recording means transmits the data to which the auxiliary data has been added to the m × (2n + 1) tracks (m
= 2, 4, 6,..., N = 1, 2, 3,...), And when the recording mode is the long-time recording mode, the data to which the auxiliary data is added. May be divided into 2n + 1 tracks of the recording medium and recorded.

Another digital signal recording apparatus according to the present invention comprises:
What is claimed is: 1. A digital signal recording apparatus for recording a digital signal on a recording medium, comprising: mode setting means for setting a recording mode, wherein the recording mode includes a standard recording mode and a long recording mode in which a recording time is longer than the standard recording mode. And a coding means for coding a signal with a data amount corresponding to the recording mode set by the mode setting means, wherein the recording mode is a long time recording mode. Encoding means whose data amount is 1 / n times the data amount when the recording mode is the standard recording mode, and recording for recording the encoded data on a recording medium having a plurality of tracks. Means, wherein the recording means selects one of the plurality of tracks according to a recording mode set by the mode setting means.
Address generating means for generating a track address designating one of the first and second recording modes, wherein, when the recording mode is the long-time recording mode, a track address that circulates in a cycle of n frames is generated, and the recording mode is a standard recording mode. In this case, there are provided an address generating means for generating a track address circulating with one frame as a cycle, and an address adding means for adding the track address to the encoded data, whereby the object is achieved. .

The address generating means may further generate a frame address for identifying each frame of the video signal.

[0029] The address generating means may generate a track address having the same value for two adjacent tracks having different azimuths among the plurality of tracks.

The recording means is the current 525 line-60
When recording a field type TV signal, n frames of the TV signal are recorded on 10 tracks, and when recording a current 625 line-50 field type TV signal, n frames of the TV signal are recorded on 12 tracks. Good.

In the standard recording mode, n = 1, and in the long-time recording mode, n = 2.

Another digital signal recording apparatus according to the present invention comprises:
Signal mode setting means for setting a signal mode, wherein the signal mode is one of an HDTV signal mode, a wide TV signal mode, and a standard TV signal mode; A / D conversion means for performing analog / digital conversion by sampling a video signal including a luminance signal, a first color difference signal, and a second color difference signal at a sampling frequency according to a signal mode set by the means. , The signal mode is H
The ratio of the sampling frequency when the signal mode is a DTV signal to the sampling frequency when the signal mode is a wide TV signal and the sampling frequency when the signal mode is a standard TV signal is 4: 2: 1. Conversion means;
Effective pixel extracting means for extracting effective pixels from the digitized video signal with a number of samples corresponding to the signal mode set by the signal mode setting means, wherein the number of samples is set when the signal mode is an HDTV signal. Effective pixel extracting means, wherein the ratio between the number of samples when the signal mode is a wide TV signal and the number of samples when the signal mode is a standard TV signal is 4: 2: 1, Blocking means for dividing the pixel data from the output into rectangular blocks on the screen for each of the luminance signal and the chrominance signal; a luminance signal, a first chrominance signal and a second chrominance signal corresponding to the same position on the screen; A macroblock generating means for forming one macroblock from each block of the color difference signal, and a segmenter for collecting a predetermined number of the macroblocks to form one segment. Coding means for coding the segment, wherein the coding means controls the amount of coded data to be substantially equal to a predetermined amount in segment units; and Recording means for recording data encoded by the encoding means on a recording medium having a plurality of tracks in accordance with the signal mode set by the setting means, wherein the signal mode is an HDTV signal; The encoded data is recorded on 4n tracks (n: a positive integer) per frame, and when the signal mode is a wide TV signal, the encoded data is recorded on 2n tracks per frame. And recording means for recording the encoded data on n tracks per frame when the signal mode is a standard TV signal. More, the above objects can be achieved.

The A / D conversion means converts the luminance signal to 4 when the signal mode is the HDTV signal mode.
Sampling at 0.5 MHz, sampling the first and second color difference signals at 13.5 MHz, sampling the luminance signal at 20.25 MHz when the signal mode is the wide TV signal mode, and ,
The first and second color difference signals are sampled at 6.75 MHz, and when the signal mode is the standard TV signal mode, the luminance signal is sampled at 10.125 MHz, and the first and second color difference signals are sampled. 3.37
Sampling may be performed at 5 MHz.

When the signal mode is the HDTV signal mode, the number of horizontal effective pixels to be extracted from the video signal by the effective pixel extracting means, and when the signal mode is the wide TV signal mode, the effective pixel extracting means The ratio between the number of horizontal effective pixels extracted from the video signal and the number of horizontal effective pixels extracted from the video signal by the effective pixel extracting means when the signal mode is the standard TV signal mode is 2: 2: 1. The number of vertical effective lines extracted from the video signal by the effective pixel extracting means when the signal mode is the HDTV signal mode, and the effective pixel extracting means when the signal mode is the wide TV signal mode. The number of vertical effective lines to be extracted from the video signal and the effective pixel extracting means when the signal mode is a standard TV signal mode, The ratio of the number of vertical effective lines extracted from the image signal 2: 1: 1.

[0035]

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

(First Embodiment) FIG. 1 shows a configuration of a digital signal recording apparatus according to a first embodiment of the present invention. Hereinafter, members having the same configuration and function are denoted by the same reference numerals. The digital signal recording device has a mode setting device 100 for setting one of a standard recording mode and a long-time recording mode. The mode setting device 100 includes mode information 10 indicating the set mode.
Outputs 1. The digital signal recording apparatus processes and varies the luminance signal Y, the color difference signal (RY), and the color difference signal (BY) input through the input terminals 102, 103 and 104, respectively, according to the mode information. The long-coded video signal is output via the output terminal 122.

The digital signal recording apparatus further has A / D converters 105, 106 and 107 and a sampling frequency setting unit 108. A / D converter 10
Inputs of 5, 106 and 107 are input terminals 102, 1
03 and 104 respectively. A / D converters 105, 106 and 107 convert an analog signal into a digital signal. The clock 109 is supplied from the sampling frequency setting unit 108 to the A / D converter 105. The sampling frequency of the A / D converter 105 is set by the clock 109 and is variable. A / D
The sampling frequencies of converters 106 and 107 are fixed.

The digital signal recording device includes a delay unit 112
, Line thinning devices 110 and 111, switch 1
13, 114 and 115 are further provided. The delay unit 112 is connected to the output of the A / D converter 105, and delays the luminance signal by the processing time in the line thinning units 110 and 111. The line thinning device 110 has an A / D
After being connected to the output of the converter 106 and limiting the vertical band of the color difference signal to １ ／, the color difference signal is thinned out line by line.
The line thinning device 111 is connected to the output of the A / D converter 107 and limits the vertical band of the color difference signal to １ ／.
The color difference signal is thinned out for each line. The input of the switch 113 is connected to the output of the A / D converter 105 and the output of the delay unit 112, and according to the mode information 101, the A / D converter 10
5 and the output of the delay unit 112. The input of the switch 114 is the A / D converter 106
And the output of the line thinning device 110, and outputs one of the output of the A / D converter 106 and the output of the line thinning device 110 according to the mode information 101. The input of the switch 115 is connected to the output of the A / D converter 107 and the output of the line thinning device 111, and any one of the output of the A / D converter 107 and the output of the line thinning device 111 according to the mode information 101. Output one or the other.

The digital signal recording device further includes a blocker 116, an orthogonal transformer 117, a quantizer 118, a quantization controller 119, and a variable length encoder 121. The block generator 116 includes a switch 113,
It is connected to outputs 114 and 115, respectively, and forms a block of horizontal 8 pixels × vertical 8 lines from a signal input in raster order according to the mode information 101, and outputs a block unit signal. The orthogonal transformer 117 is (8 ×
8) Two-dimensional orthogonal transformation is performed for each block. The quantizer 118 quantizes the output of the orthogonal transformer 117. The quantization step in the quantizer 118 is the quantization controller 1
It is determined by the quantization information 120 output from 19. The quantization controller 119 determines a quantization step in the quantizer 118 according to the mode information 101 so that the data amount after the high-efficiency encoding is equal to or smaller than a predetermined data amount. The variable length coder 121 performs variable length coding on the output of the quantizer 118. The variable-length-encoded video signal is output via an output terminal 122.

Hereinafter, the operation of the digital signal recording apparatus according to the present embodiment having the above-described configuration will be described.

The mode setting unit 100 sets the mode information 101 to "0" in the standard recording mode, and sets the mode information 101 to "1" in the long-time recording mode. The mode setting information is supplied to the sampling frequency setting unit 108, the switches 113, 114 and 115, the blocking unit 116, and the quantization controller 119.

The luminance signal and chrominance signal (RY, BY) input via terminals 102, 103 and 104 are
The signals are converted into digital signals by A / D converters 105, 106 and 107, respectively. The sampling frequency setting unit 108 outputs a clock 109 having a different frequency according to the mode information 101 to the A / D converter 105. The sampling frequency of the luminance signal in the A / D converter 105 is set by the clock 109. The clock 109 is 13.5 MHz in the standard recording mode,
In the long-time recording mode, it is set to have a frequency of 10.125 MHz. Thus, the sampling frequency of the luminance signal in the long-time recording mode is set to ／ times the sampling frequency of the luminance signal in the standard recording mode. The sampling frequency of the color difference signal is always 3.
It is fixed at 375 MHz.

When the mode information is "0", the switches 113, 114 and 115 switch the A / D converter 105,
Control is performed to select the outputs of 106 and 107, respectively. When the mode information is “1”, the switch 1
13, 114 and 115 are controlled so as to select the outputs of the delay unit 112, the line thinning unit 110 and the line thinning unit 111. Therefore, in the standard recording mode, the outputs of the A / D converters 105, 106, and 107 are input to the blocking unit 116, and in the long-time recording mode, the outputs of the delay unit 112, the line thinning unit 110, and the line thinning unit 111 are output. It is input to the block generator 116.

FIG. 2A shows the number of samples per frame input to the blocking unit 116 in the standard recording mode. As shown in FIG. 2A, the number of samples in the standard recording mode is 720 pixels × 480 lines + 180 pixels ×
480 lines × 2 = 518400 samples / frame.

FIG. 2B shows the number of samples per frame input to the blocking unit 116 in the long-time recording mode. As shown in FIG. 2B, the number of samples in the long-time recording mode is 540 pixels × 480 lines + 180 pixels × 240 lines × 2 = 345600 samples / frame. Therefore, the total number of samples in the long-time recording mode is 2/3 of the number of samples in the standard recording mode.

The block generator 116 blocks the luminance signal and the chrominance signal input in the raster order into blocks of 8 pixels in the horizontal direction and 8 lines in the vertical direction, and then outputs the signals in units of five macro blocks. Here, the macro block is configured by collecting a block of a luminance signal and a block of a chrominance signal at the same position on the screen.

FIG. 3 shows a macroblock output from the block generator 116 as one unit of high-efficiency coding (hereinafter, referred to as a video segment) in the standard recording mode. In this example, one video segment is composed of five macroblocks 300, 301, 302, 303 and 304. Also, the macro block 300,
Each of 301, 302, 303 and 304 is composed of four blocks of luminance signal, one block of RY color difference signal, and one block of BY signal.
It is composed of a total of six blocks of one color difference signal.
Therefore, one video segment is composed of 30 blocks. FIG. 4 shows a macroblock output from the blocker 116 as a video segment in the long recording mode. In this example, one video segment consists of five macroblocks 400, 401, 40
2, 403 and 404. Also, macro blocks 400, 401, 402, 403 and 404
Are composed of a total of eight blocks of six blocks of luminance signal, one block of RY color difference signal, and one block of BY color difference signal. Therefore, one video segment is 40
It consists of blocks. Also, the number of video segments and macroblocks per frame in the long-time recording mode is 1/100 of the number of video segments and macroblocks per frame in the standard recording mode.
It is 2.

The video segment unit data output from the block generator 116 is input to the orthogonal transformer 117, where (8 × 8) two-dimensional orthogonal transform is performed. Coefficients obtained as a result of the two-dimensional orthogonal transform are quantized by a quantizer 118. The quantization step in the quantizer 118 is determined by the quantization controller 119. The quantization controller 119 determines the quantization step so that the data amount after encoding the data of one video segment is equal to or smaller than a predetermined data amount. In other words, the coefficient of each block is quantized in a plurality of quantization steps prepared in advance and the amount of data generated when variable-length coding is performed is estimated, so that the data amount after coding is equal to or less than a predetermined data amount. Determine the quantization step. The coefficients quantized in the determined quantization step are output to the variable-length encoder 12.
In step 1, variable-length coding is performed based on the Huffman table.

As described with reference to FIG. 3 and FIG.
The number of blocks per video segment is 30 in the standard recording mode and 40 in the long recording mode. On the other hand, the encoded data amount of one video segment is controlled by the quantization controller 119 so as to be the same. As a result, the compression ratio in the long-time recording mode is 4/3 times the compression ratio in the standard recording mode.

The data which has been efficiently coded by the above method is output from the code word output terminal 122. The encoded signal is recorded on a recording medium with a parity for error correction added as necessary.

As described above, according to this embodiment,
In the long-time recording mode, the sampling frequency of the A / D conversion of the luminance signal is set to 3/4, and the line difference is thinned out for the color difference signal, so that the information amount is reduced to 2/3 before the high efficiency coding. Further, by reducing the number of blocks per video segment to 4/3 times that in the standard recording mode and increasing the compression ratio to 4/3 times, the amount of data to be recorded is reduced to half that in the standard recording mode. Is possible.

(Second Embodiment) FIG. 5 shows the configuration of a digital signal recording apparatus according to a second embodiment of the present invention. The digital signal recording apparatus of the present embodiment has a rate converter 500 instead of the delay unit 112.

In the first embodiment, the sampling frequency of the luminance signal in the A / D converter 105 is switched according to the mode information 101. On the other hand, in this embodiment, the sampling frequency of the luminance signal in the A / D converter 105 is 13.5 MHz regardless of the mode information 101.
z and the luminance signal is A / D
After the conversion, the rate is converted by the rate converter 500, thereby realizing that the number of samples of the luminance signal in the long-time recording mode is 3/4 times the number of samples in the standard recording mode.

FIG. 6 is a diagram for explaining the rate conversion in the rate converter 500. In FIG. 6, ○ indicates a sample value when the sampling frequency is 13.5 MHz. The rate converter 500 calculates a sample value corresponding to 10.125 MHz indicated by ● using the sample value indicated by ○. The operation of the digital signal recording apparatus of the present embodiment after the rate conversion is the same as the operation of the digital signal recording apparatus of the first embodiment, and a description thereof will be omitted.

As described above, according to this embodiment,
The clock supplied to the A / D converter 105 in the standard recording mode and the clock supplied to the A / D converter 105 in the long-time recording mode can be shared. Thus, it is possible to cope with the long-time recording mode only with the digital processing unit.

(Third Embodiment) FIG. 7 shows the configuration of a digital signal recording apparatus according to a third embodiment of the present invention. The digital signal recording apparatus of the present embodiment has a digital filter 700 instead of the delay unit 112.

The difference between the first embodiment and this embodiment is that the A / D
This is a part in which the converted luminance signal is suppressed on the high frequency side of the frequency component using the digital filter 700.

FIG. 8 shows the frequency characteristics of the luminance signal after A / D conversion and after digital filter processing. A curve 800 is a luminance signal characteristic in the standard recording mode sampled at 13.5 MHz, and a curve 801 is 1
A luminance signal characteristic in a long-time recording mode sampled at 0.125 MHz, and a curve 802 is a luminance signal characteristic preferable in a long-time recording mode in which a high band side is suppressed by a digital filter 700 with respect to a characteristic shown by a curve 801. Is shown.

In the standard recording mode, the gain of the luminance signal is 0 dB at 5.75 MHz or less, and -dB at 6.75 MHz.
12 dB or less and specified in REC 601 (curve 8
00). Since the sampling frequency of the luminance signal is 3/4 of the standard recording mode in the long time recording mode,
According to the provisions of EC601, 4.3 as in curve 801
It becomes 0 dB at 1 MHz or less and -12 dB or less at 5.06 MHz.

However, as described in the first embodiment, in the long-time recording mode, compression is performed at a compression rate 4/3 times that in the standard recording mode. It is not possible to allocate a sufficient code amount to the affected low-mid band, resulting in image quality degradation. Therefore, the digital filter 700 sufficiently attenuates the high band of 5 MHz or more, and further attenuates the band slightly in the band of 4 to 5 MHz so that the filter design becomes easy. You can assign the quantity. The detailed characteristics of the digital filter 700 can be arbitrarily set while observing the processed image quality.

As described above, in the present embodiment, in the long-time recording mode, by sufficiently attenuating the high-band side of the luminance signal, it is possible to prevent significant image quality deterioration during encoding.

(Fourth Embodiment) FIG. 9 shows the configuration of a digital signal recording apparatus according to a fourth embodiment of the present invention. In this embodiment, the rate converter 500 of the second embodiment is used.
Immediately after the digital filter 7 described in the third embodiment.
00 has been added. According to this embodiment, it is possible to use a common clock for the A / D conversion of the luminance signal and to cope with the long-time recording mode only with the digital processing unit.
Further, with the digital filter 700, the same effect as that described in the third embodiment can be obtained. In this embodiment, after the rate conversion, the digital filter 7
Although 00 is applied, the rate conversion is generally realized by using a digital filter in many cases. Therefore, a configuration in which the rate converter 500 and the digital filter 700 are integrated may be possible.

(Fifth Embodiment) FIG. 10 shows the configuration of a digital signal recording apparatus according to a fifth embodiment of the present invention.
Here, 1000 is a simplified blocker, 1001 is an auxiliary data adder, 1002 is an error correction encoder, 1003 is a recording encoder, 1004 is a recording amplifier, 1005 is a recording head, 1006 is a magnetic tape, and 1007 is audio. A signal input terminal, 1008 is an audio signal encoder, 1009 is a tape speed controller, and 1010 is a tape feed motor.

Hereinafter, the operation of the digital signal recording apparatus according to the fifth embodiment will be described. The operation of each device indicated by 100 to 115 and 117 to 121 is the same as the operation of each device assigned the same number in the third embodiment. In the present embodiment, the digital filter 700 described in the third embodiment is used at the time of luminance signal processing. However, a configuration in which this is replaced with the delay unit 112 in the first embodiment is also possible. FIG. 11 shows an example of the configuration of a macroblock in the long-time recording mode. In this example, one frame of the luminance signal is composed of 540 horizontal pixels and 480 vertical lines, and one macroblock is composed of 24 horizontal pixels and 16 vertical lines. Therefore, 1
The frame is divided into 22.5 horizontal blocks and 30 vertical blocks, for a total of 675 macroblocks. At this time, since the number of horizontal pixels in one frame is not an integral multiple of the number of horizontal pixels in the macroblock, the rightmost macroblock is vertically long (M
B44).

In the case where a vertically long macro block exists as in the example shown in FIG. 11, the conventional method requires more line memories than the processing of a normal macro block.

On the other hand, in this embodiment, the use of the simple blocking unit 1000 simplifies the blocking process and prevents an increase in the number of circuits.

FIG. 12 shows the configuration of the simplified blocker 1000 in this embodiment in detail. As shown in FIG. 12, the simplified blocker 1000 includes a memory 1202,
It includes a selector 1203, an address controller 1206, and a pseudo macroblock detector 1207.

In FIG. 12, a video signal input terminal 120
3 are input to the memory 1202 and the address controller 1.
206 is input. The address controller 1206 detects an effective pixel range from the horizontal and vertical synchronizing signals of the input video signal, and controls the address so that the video signal input to the memory for each horizontal line is read out in the order of the macroblock. Thereby, from the memory 1202,
Video signals are output in macroblock units. here,
A macro block composed of an input video signal output from the memory 1202 is called an input macro block.

Next, a pseudo macroblock detector 1207
In the case where the address of the rightmost macroblock in the horizontal direction (the area of the rightmost 12 pixels in FIG. 11) in one frame is output from the address controller 1206, the pseudo macroblock detection signal is output to the selector 1203. Selector 12
In 03, when the pseudo macroblock detection signal is not input, the input macroblock is output via the output terminal 1205, and when the pseudo macroblock detection signal is input, a predetermined value is output via the output terminal 1205. Output. Here, a macroblock having a predetermined value output when a pseudo macroblock is detected from the selector 1203 is called a pseudo macroblock.

In this embodiment, since the macroblock having the special shape at the right end in FIG. 11 is replaced with a pseudo macroblock, there is no need to read the input video signal from the memory 1202 during that time. Therefore, there is no need for an address generation circuit or a memory area for storing a video signal for a macroblock having a special shape. Accordingly, even when the number of horizontal or vertical effective pixels of one frame is not an integral multiple of the number of horizontal or vertical pixels of a macroblock as shown in FIG. 11, an increase in the number of address generation circuits and memories is not required.

Next, an embodiment of the pseudo macroblock constructor (selector 1203 in FIG. 12) will be described with reference to FIG. 13, reference numeral 1301 denotes an input macroblock input unit, 1302 denotes a 128 generator, 1303 denotes a pseudo macroblock detector, 1304 denotes a switch, and 1305 denotes a macroblock output unit.

The switch 1304 in FIG. 13 outputs the input macroblock input from the input macroblock input unit 1301 to the macroblock output unit 1305 when the pseudo macroblock detection signal is not input from the pseudo macroblock detection unit 1303. When a pseudo macroblock detection signal is input, the value 128 generated by the 128 generator 1302 is output to the macroblock output unit 1305. As a result, when a pseudo macroblock is detected, a value 128 is always output as the pixel value of the pseudo macroblock.

In this case, since the pixel values in the pseudo macro block are all constant at 128, the data amount becomes very small when the image is coded. This makes it possible to allocate codeword data of another input macroblock to a part of the codeword area allocated to the pseudo macroblock, thereby reducing the compression ratio of the input macroblock and improving the reproduction image quality. It becomes possible to do.

As described above, in this embodiment, by setting the pixel value of the pseudo macro block to a constant value, it is possible to improve the reproduction image quality of the input macro block. FIG. 14 shows an example of a reproduction screen when such a pseudo macro block is used. The hatched portion on the right end of FIG. 14 is a pseudo macro block area. In the embodiment of FIG. 14, since the pseudo-macroblock area is all reproduced as 128 pixel values, it is recognized as horizontal blanking and does not visually interfere.

The pseudo-macroblock method in the present embodiment can be applied to any macroblock structure and frame structure. Further, the pixel value in the pseudo macro block is not limited to the value 128 as in the present embodiment, and an arbitrary value can be selected. Further, it is also possible to change the pixel value in the pseudo macro block for each small block.

Further, in the reproducing apparatus to which the simple blocker 1000 is applied, it is possible to replace the pixel value of the pseudo macroblock area with an arbitrary value at the time of reproduction and output the same as in the encoding apparatus.

FIG. 15 shows the configuration of the auxiliary data adder 1001 in this embodiment in detail. Auxiliary data adder 1
001 includes an auxiliary data generator 1501, an auxiliary data inserter 1502, and a controller 1503. Digital data is input to the auxiliary data inserter 1502 via the input terminal 1500, and a signal with the auxiliary data inserted is output from the auxiliary data inserter 1502 via the output terminal 1504. The mode information 101 is input to the auxiliary data generator 1501 and the controller 1503 via the mode information input terminal 1505.

In this embodiment, the video data is input to the input terminal 15.
It is assumed that the information amount is input via the “00” and the information amount in the long-time recording mode is の of the information amount in the standard recording mode. At this time, for example, recording is performed using 10 tracks per frame in the standard recording mode, and 5 tracks per frame in the long-time recording mode.

First, the case where recording is performed in the standard recording mode will be described. The auxiliary data is output from the auxiliary data generator 15.
01 generated. The auxiliary data is inserted into the encoded video data by the auxiliary data inserter 1502. The position where the auxiliary data is inserted into the video data is controlled by the controller 1503.

FIG. 16A conceptually shows the position of auxiliary data inserted in a recording track. As shown in FIG. 16A, the auxiliary data is periodically and repeatedly inserted in the order of A → B → A → B →. Next, a case where recording is performed in the long-time recording mode continuously from the end of recording in the standard recording mode will be described. At this time, video data in the long recording mode is input, and the mode information input terminal 15
The mode information from 05 switches from "0" (standard recording mode) to "1" (long-time recording mode). Thereafter, the auxiliary data for the long-time recording mode generated by the auxiliary data generator 1501 is inserted by the auxiliary data inserter 1502 while the insertion position is controlled by the controller 1503.

The auxiliary data is periodically inserted from the head track of the frame to a different position for each track as in the case of the standard recording mode. However, in the case of the long-time recording mode, the number of recording tracks per frame is 2n + 1. Since (n = 1, 2,..., N = 2 in the present embodiment), the controller 1503 controls the two-frame cycle, and as shown in FIG. D → C
→ D → C, and the next frame is arranged in the order of D → C → D → C → D. Accordingly, the periodicity of the auxiliary data insertion position becomes the same as that in the standard recording mode.

Further, when recording is performed in the standard recording mode after recording in the long recording mode, m frames (m = 2, 4, 6,..., M = 2 in the present embodiment) in the long recording mode ) Is used as one editing unit, and the controller 1503 controls the recording start position so that recording is performed in the standard recording mode after a frame where the break of the editing unit, that is, the auxiliary data insertion position ends at the position C. The recording pattern recorded in this way is shown in FIG.
It is shown in (c). As can be seen from the figure, the periodicity of the auxiliary data insertion position is preserved over both the portion recorded in the standard recording mode and the portion recorded in the long time recording mode.

As described above, according to the present embodiment, the control of the auxiliary data insertion position and the control of the switching point timing of the recording mode are performed, so that both modes can be mixedly recorded on a tape-shaped recording medium. However, since the periodicity of the auxiliary data insertion position can be maintained, auxiliary data detection during reproduction can be performed by the detection circuit and detection timing in the standard recording mode regardless of whether the recording mode is the standard recording mode or the long-time recording mode. In the present embodiment, the number of recording tracks in the standard recording mode is set to 10 per frame, and the number of recording tracks in the long-time recording mode is set to 5 per frame.
The amount of information in long-time recording mode is 1 / m of that in standard recording mode
(M = 2, 4, 6,...). At this time, the number of recording tracks in the long-time recording mode can be generalized to 2n + 1, and the number of recording tracks in the standard recording mode can be generalized to m × (2n + 1). It is clear that similar effects can be obtained even when these generalizations are made.

In the present embodiment, the recording data is described as video data. However, it is apparent that the same effect can be obtained even in the case of audio data or other information data. Also, any method such as DCT or DPCM may be used for the compression method of the video signal and the audio signal.

Although the detailed configuration of the track contents has not been particularly described, any configuration may be used. The content of the auxiliary data is mainly information necessary for reconstructing audio data, video data, and the like, but may have any content.

The data to which the auxiliary data has been added is added with an appropriate error correction code according to the mode information 101 by the error correction encoder 1002.

FIG. 17 is a diagram showing details of the recording encoder 1003. 1700 is a data input terminal, 1701 is a mode information input terminal, 1702 is an address adder, 17
03 is a frame control signal generator, and 1704 is a recording data output terminal. Hereinafter, the operation of the recording encoder according to the present embodiment will be described. Here, video data is used as input data, and one-frame control is performed in the standard recording mode and two-frame control is performed in the long-time recording mode. However, control in units of n frames can be similarly performed.

The frame control signal generator 1703 outputs a one-frame control signal for synchronizing one frame when the mode information 101 is “0”, and a two-frame control signal for synchronizing two frames when the mode information 101 is “1”. Generate This 2
If the input video signal is a composite signal, the frame control signal can be synchronized with the color frame period.

The audio signal input from the audio input terminal 1007 is subjected to A / D conversion by an audio signal processor 1008 if it is an analog input, and is subjected to filtering suitable for the mode information 101 in the case of a digital input. , Rearrange, and if necessary, perform predetermined audio signal processing such as compression, and add auxiliary data to make a block,
Output as audio data. After that, error correction coding is performed on the data blocked by the error correction encoder 1002, an address for recording is added by the recording encoder 1003, and the recording head 100
5 is recorded on the magnetic tape 1006.

The tape speed controller 1009 determines a tape feed speed suitable for each mode according to the mode information 101, and controls the tape feed motor 1010.

Here, each track is recorded in the same format as the recording pattern shown in the conventional example, but the pattern actually formed on the tape has a different tape feed speed.
The track angles may be slightly different.

The sub-code data and auxiliary data arranged for each field or one frame can also be arranged for every two frames based on a two-frame control signal. In order to be handled in the same manner as a recorded one, the address is composed of a frame address for identifying a frame, a track address having a cycle of two frames, and a block address having a cycle of one track. For example, conventionally 1
In a recording apparatus in which a frame is composed of ten tracks, the frame address and the track address can be as shown in FIG. The track address is set to 0
, The same value is assigned to adjacent tracks with different azimuths.However, regardless of the starting value, the same value is used regardless of whether the value changes for each track or decreases instead of increasing. The result. Although the recording format of the track is as described in FIG. 19, the number of sectors and other formats are arbitrary, and similar effects can be obtained. Further, in the present invention, the address is added after performing the error correction coding. However, even if the address and the data are subjected to the error correction coding and then the parity is generated by performing the error correction coding, Similar effects can be obtained.

When recording a current 525 line-60 field TV signal, n frames of the TV signal are recorded on 10 tracks, and when recording a current 625 line-50 field TV signal, n frames of the TV signal are recorded.
Frames may be recorded on 12 tracks. in this case,
In the standard recording mode, n = 1, and in the long-time recording mode, n = 2.

As described above, according to the present embodiment,
By compressing the video signal with n times the efficiency and using a track address designating a track with a cycle of n frames, it is possible to record for a longer time than in the past. Further, by making the configuration of the recording apparatus compatible with the standard recording mode and the long-time recording mode, it becomes possible with almost no increase in circuits except for the parts required for high compression. In addition, any method may be used for compressing the video signal and the audio signal.

(Sixth Embodiment) FIG. 20 shows the configuration of a digital video signal recording apparatus according to a sixth embodiment of the present invention. In FIG. 20, reference numeral 2000 denotes an HDTV signal recording mode, a wide TV signal recording mode, or a standard TV.
A TV signal mode setting device 200 for setting one of the V signal recording modes;
TV signal mode information set with 0, 2002 is an effective pixel extractor that extracts an effective pixel from the pixel data of the input image signal, and 2003 is 8 horizontal pixels from the input signal.
A block forming unit which forms a block of eight vertical lines and outputs a signal in block units, a macro block 2004 is formed by combining one block of the color difference signal with the luminance signal block and two color difference signals included in substantially the same range on the screen. , A segmenter that collects and segments the five macroblocks from locations distant from each other on the screen, and 2006 performs encoding so that the code amount falls below a predetermined code amount in segment units. In the encoder 2006, 117 is an orthogonal transformer,
Reference numeral 118 denotes a quantizer, 119 denotes a quantization controller that determines a quantization step in the quantizer 118 so that the data amount after high-efficiency encoding is equal to or less than a predetermined data amount, and 121 denotes a variable-length encoder. is there. Hereinafter, the operation of this embodiment will be described with reference to FIG.

The TV signal mode setting unit 2000 sets the present apparatus to one of the HDTV signal recording mode, the wide TV signal recording mode and the standard TV signal recording mode, and outputs a control signal corresponding to each mode.

A luminance signal and two types of color difference signals (RY, B-) input from terminals 102, 103, and 104, respectively.
Y) are converted into digital signals by A / D converters 105, 106, and 107, respectively. The sampling frequency setting unit 108 controls the A / D converter 105 based on the TV signal mode information 2001 from the TV signal mode setting unit 2000,
The sampling frequency in 106 and 107 is set.

In the HDTV signal recording mode, the sampling frequency of the A / D converter 105 is 40.5 MHz.
The sampling frequency of the / D converters 106 and 107 is 1
In the wide TV signal recording mode, the sampling frequency of the A / D converter 105 is set to 3.5 MHz.
0.25 MHz, the sampling frequency of the A / D converters 106 and 107 is set to 6.75 MHz. In the standard TV signal recording mode, the sampling frequency of the A / D converter 105 is 10.125 MHz, and the A / D conversion is performed. Vessel 1
The sampling frequency of 06 and 107 is 3.375 MHz
Shall be set to

The luminance signal output from the A / D converter 105 and converted into a digital signal is output from the effective pixel extractor 2
002. A / D converters 106 and 107
The two types of color difference signals converted into digital signals output from are subjected to line decimation for each line after the vertical band is limited to ラ イ ン by line decimation devices 110 and 111, respectively. It is input to the extractor 2002.

The effective pixel extractor 2002 extracts and outputs effective pixel data to be actually recorded and recorded from the input pixel data. In the case of the present embodiment, based on the mode information from the mode setting device 100, the HDT
In the V signal recording mode, the luminance signal is 1080 horizontal pixels × 960 vertical lines, the color difference signal is 360 horizontal pixels × 480 vertical lines, and in the wide TV signal recording mode, the luminance signal is 1080 horizontal pixels × 480 vertical lines. Is 360 pixels horizontal x 240 lines vertical, and standard TV
In the signal recording mode, the luminance signal is 540 horizontal pixels × 480 vertical lines, and the color difference signal is 180 horizontal pixels × 24 vertical pixels.
Pixel data for 0 lines is selectively extracted.

The blocker 2003 constitutes a block of 8 horizontal pixels × 8 vertical lines from the pixel data extracted by the effective pixel extractor 2002, and outputs a signal in block units.

The macroblock converter 2004 forms one macroblock from one block of the color difference signal, a block of the luminance signal included in substantially the same area on the screen, and a block of the other color difference signal. And output. In the case of this embodiment, a macroblock is composed of a total of 8 DCT blocks of the six luminance signal blocks and two types of color difference signal blocks shown in FIG. 4 for all the recording modes.

The segmenter 2005 collects a plurality of the above macroblocks from locations apart from each other on the screen and averages one segment in order to average the amount of generated code per segment as a unit of encoding as much as possible. Constitute. In the case of the present embodiment, one segment is composed of five macro blocks. In the HDTV signal recording mode, the wide TV signal recording mode, and the standard TV signal recording mode, the positional relationships on the screen of the macroblocks constituting the segments are shown in FIGS. 21, 22, and 3, respectively.

The segmented image data is encoded by the encoder 2006 so as to fall within a predetermined code amount in segment units. In the case of the HDTV signal recording mode, the number of segments per frame is as shown in FIG.
In the case of the horizontal TV signal recording mode, the horizontal TV macro recording mode is shown in FIG.
In the standard TV signal recording mode, 45 horizontal macros × 30 vertical macros = 270 segments, and in the standard TV signal recording mode, 22.5 horizontal macros × 30 vertical macro / 5 = 135 segments as shown in FIG. Assuming that the number of recording tracks per frame configured on the 1006 is 20 tracks, 10 tracks, and 5 tracks, respectively, the number of segments per track is 27 segments, and the recordable code amount per track is A bits. Then, the available code amount per segment is equal in all recording modes (A / 2
7) Can be bits.

The operation of the encoder 2006 will be described in more detail. The image data input to the encoder 114 is subjected to two-dimensional orthogonal transform in an orthogonal transformer 1141 in units of 8 × 8 blocks formed by the block generator 111, and is output as orthogonal transform coefficients. The coefficients obtained as a result of the two-dimensional orthogonal transform are quantized by the quantizer 1142, and the quantization step in the quantizer 1142 is determined by the quantization controller 1143. The quantization controller 1143 determines the quantization step so that the amount of data generated when encoding the data of one of the segments is equal to or less than a predetermined data amount. That is,
The coefficient of each block is quantized in a plurality of quantization steps prepared in advance, and the amount of data generated when variable-length coding is performed is estimated, and the quantization is performed so that the data amount after coding becomes equal to or less than a predetermined data amount. Determine the optimization step. And
The coefficients quantized in the quantization step determined by the above operation are variable-length coded by a variable-length coder 1144 based on a Huffman table.

The data which has been highly coded by the above-described method is recorded on the magnetic tape 1006 by performing a helical scan on the magnetic tape 1006 through a process similar to that of the fifth embodiment of the present invention. 20 tracks per frame in the HDTV signal recording mode, 10 tracks per frame in the wide TV signal recording mode, and 5 tracks per frame in the standard TV signal recording mode.

The tape speed setting device 1009 receives the TV signal mode information 2001 from the TV signal mode setting device 2000.
The rotation speed of the tape feed motor 1010 is controlled in accordance with the above, and the tape feed speed of the magnetic tape 1006 is changed so that the recording track width becomes equal in each of the recording modes.

As described above, according to the digital video signal recording apparatus of this embodiment, the HDTV signal and the wide T
Digital VTR that can record V signal and standard TV signal
, The ratio of the sampling frequency of each TV signal, the ratio of the number of effective samples, and the ratio of the number of recording tracks per frame are 4: 2: 1, so that the macroblock configuration of each signal becomes the same and the compression ratio is set to the same By doing so, it is possible to share the macro block unit and the encoding unit, which were difficult to share in the past, and this is a significant factor in configuring a digital VTR that can record HDTV signals, wide TV signals, and standard TV signals. Circuit sharing is possible.

The sampling frequency, the number of effective samples, and the number of recording tracks per frame exemplified in the description of the present embodiment are particularly determined as long as they satisfy the proportional relation between the respective recording modes. is not.

Although the sampling frequency is changed according to each recording mode, the A / D converters 105, 10
The sampling frequencies 6 and 107 are the values of the least common multiple of the sampling frequency corresponding to each recording mode, that is, in this embodiment, the luminance signal is fixed at 40.5 MHz, and then the digital filter and the pixel thinning process are performed according to each recording mode. 20.5 MHz, 10.1
Rate conversion to 25 MHz may be performed.

Although the present embodiment has been described with respect to the case where the color difference signal is processed in a line sequential manner, the effect of the present invention is not changed even when the line sequential processing is not performed.

Also, the segmenter 2005 collects five macroblocks to form one segment. However, any value may be used as long as the same configuration can be used in each recording mode.

Although the encoding in the encoder 2006 is based on the orthogonal transform, there is no particular limitation, and the effect of the present invention remains unchanged regardless of the encoding.

In this embodiment, the recording head 1004
Although the scanner configuration such as the arrangement on the rotary cylinder is not specifically mentioned, any configuration can be used as long as the recording tracks on the magnetic tape 1006 can be configured with the track number ratio corresponding to each recording mode. There may be.

In this embodiment, three types of recorded video signals are used, and the HDTV signal recording mode, the 16: 9 wide TV signal recording mode, and the standard TV signal recording mode are used.
The same effect can be obtained by positioning the wide TV signal recording mode as a standard TV signal recording mode and the standard TV signal recording mode as a standard TV signal long-time recording mode.

Further, the effect of the present invention does not change even if two types of recording video signals are used, that is, an HDTV signal and a standard TV signal.

The video signal data recorded by the digital video signal recording apparatus of the present embodiment can be decoded and reproduced by a procedure reverse to the signal processing procedure of the digital video signal recording apparatus.

[0118]

According to the digital signal recording apparatus of the present invention, the input video signal is reduced in the number of samples in the long-time recording mode and in the compression ratio to be higher than in the standard recording mode, so that the long-time recording is performed. The amount of information to be recorded in the time recording mode is made smaller than in the standard recording mode. As a result, recording can be performed for a longer time on the same recording medium.

Further, by suppressing the high frequency band of the video signal, more information can be allocated to the visually important low frequency band. As a result, it is possible to obtain a sufficient image quality as a household device even for a reproduced image in the long-time recording mode. Further, according to another digital signal recording apparatus of the present invention, it is possible to simplify the processing of high-efficiency encoding in the long-time recording mode, and when signals of different modes are recorded on the same recording medium. However, it is possible to maintain the periodicity of the insertion position of the auxiliary data.
This can prevent misdetection of auxiliary data,
The track address can be generated correctly even in the long-time mode. Further, when the above configuration is realized, the circuit scale is not significantly increased, and the practical effect is large.

Further, according to another digital signal recording apparatus of the present invention, when a video signal is digitized and encoded and recorded with high efficiency, the HDTV signal recording mode and the wide T
The processing is shared between the V signal recording mode and the standard TV signal recording mode, so that the circuit can be largely shared, and a sufficient band and allowable image quality can be obtained even in the standard TV signal recording mode. The effect is great.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an apparatus configuration of a first preferred embodiment of the present invention.

FIG. 2A is a conceptual diagram showing the number of samples in one frame in a standard recording mode, and FIG. 2B is a conceptual diagram showing the number of samples in one frame in a long time recording mode.

FIG. 3 is a conceptual diagram showing a macro block constituting a video segment in a standard recording mode.

FIG. 4 is a conceptual diagram showing a macro block constituting a video segment in a long recording mode.

FIG. 5 is a block diagram showing an apparatus configuration of a second preferred embodiment of the present invention.

FIG. 6 is a schematic diagram illustrating a rate conversion process in the second and fourth preferred embodiments.

FIG. 7 is a block diagram showing an apparatus configuration of a third preferred embodiment of the present invention.

FIG. 8 is a characteristic diagram of a luminance signal at the time of inputting to a blocking unit.

FIG. 9 is a block diagram showing an apparatus configuration of a fourth preferred embodiment of the present invention.

FIG. 10 is a block diagram showing a device configuration of a fifth preferred embodiment of the present invention.

FIG. 11 is a conceptual diagram illustrating a configuration of a macro block in a long recording mode.

FIG. 12 is a block diagram illustrating a configuration of a simple blocking unit.

FIG. 13 is a block diagram illustrating a configuration of a selector.

FIG. 14 is a conceptual diagram of a playback screen of a video signal recorded in the long-time recording mode.

FIG. 15 is a block diagram illustrating a configuration of an auxiliary data adder.

16A is a conceptual diagram of a track pattern recorded in a standard recording mode, FIG. 16B is a conceptual diagram of a track pattern recorded in a long recording mode after the standard recording mode, FIG. 3C is a conceptual diagram of a track pattern when recording is performed in the standard recording mode after the long-time recording mode.

FIG. 17 is a conceptual diagram illustrating a configuration of a recording encoder.

FIG. 18A is a conceptual diagram illustrating a preferable address configuration in a standard recording mode, and FIG. 18B is a conceptual diagram illustrating a preferable address configuration in a long-time recording mode.

FIG. 19 is a schematic diagram illustrating a recording pattern by a conventional recording apparatus.

FIG. 20 is a block diagram showing an apparatus configuration of a sixth preferred embodiment of the present invention.

FIG. 21 is a conceptual diagram showing a relationship between a video segment and a macroblock when an HDTV signal is recorded in the recording device of the present invention.

FIG. 22 is a conceptual diagram showing a relationship between a video segment and a macroblock when a wide TV signal is recorded in the recording device of the present invention.

[Explanation of symbols]

 102, 103, 104 Input terminal 105, 106, 107 A / D converter 108 Sampling frequency setting device 100 Mode setting device 110, 111 Line thinning device 112 Delay device 113, 114, 115 Switch 116 Blocking device 117 Quadrature converter 118 Quantizer 119 Quantization controller 121 Variable length encoder 122 Output terminal

Continued on front page (31) Priority claim number Japanese Patent Application No. 6-304639 (32) Priority date December 8, 1994 (12.8.1994) (33) Priority claim country Japan (JP) (31) Priority claim number 7-82247 (32) Priority date April 7, 1995 (4.7.1995) (33) Priority claim country Japan (JP) (31) Priority claim number 7-148231 (32) Priority date May 22, 1995 (May 22, 1995) (33) Priority country Japan (JP) (72) Inventor Akira Ikeya 1006 Kadoma, Oji, Kadoma, Osaka Matsushita Electric (72) Inventor Makoto Goto 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Susumu Yamaguchi 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Hideki Odaka 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Shigeru Awamoto 1006 Odaka Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Shoichi Nishino Osaka No. 1006, Kadoma Shinichi, Matsushita Electric Industrial Co., Ltd. (72) Takao Kayo, inventor 1006, Kadoma Kadoma, Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (56) References JP-A-7-29313 (JP, A JP-A-5-183869 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/91-5/956 H04N 5/782-5/783 G11B 20/10-20 / 12 H04N 9/79-9/898 H04N 11/00-11/24

Claims (20)

(57) [Claims] 1. A luminance signal, a first color difference signal, and a second color difference signal.
Recording apparatus for recording a video signal containing
And a mode setting section for setting a recording mode.
Mode is longer than the standard recording mode.
One of the long recording modes with time
And over de setting unit, on the recording mode set by the recording mode setting unit
The luminance signal, the first color difference signal, and the
A sampling unit for sampling the second color difference signal
Thus, the number of samples of the luminance signal in the standard recording mode and the number of samples
Number of samples of the first color difference signal and samples of the second color difference signal
The ratio with the number is 4: 1: 1 and the number of samples of the luminance signal in the long time recording mode.
Is the number of samples of the luminance signal in the standard recording mode
Of the first color in the long-time recording mode.
The number of samples of the difference signal is equal to the number of samples in the standard recording mode.
One half of the number of samples of one color difference signal,
The number of samples of the second color difference signal in the mode is the standard
1/1 of the number of samples of the second color difference signal in the recording mode
2, the sampling unit, the luminance signal and the first color difference signal in the standard recording mode.
And a second macro including the second color difference signal at a ratio of 4: 1: 1
Generate a block, and in the long recording mode,
Signal, the first color difference signal and the second color difference signal in a 6: 1: 1 ratio.
Macro block for generating a second macro block including the ratio
And click generating unit, the amount of coded data corresponding to the first macroblock and the
The amount of encoded data corresponding to the second macroblock is
The first macroblock and the second macroblock are qualitatively identical.
The encoded data is obtained by encoding two macro blocks.
An encoding unit that generates the data, and a recording unit that records the encoded data on a recording medium.
A digital signal recording device characterized by the above-mentioned. 2. The recording mode according to claim 2 , wherein:
A service corresponding to the recording mode set by the setting unit
Bright for sampling said luminance signal at a sampling frequency
2. The method according to claim 1, further comprising a degree signal sampling unit.
Digital signal recording device. 3. The sump in the standard recording mode.
The ring frequency is 13.5 MHz, and
The sampling frequency in the mode is 10.125 MHz
The digital signal recording device according to claim 2, wherein 4. The recording unit according to claim 1 , wherein
Depending on the recording mode set by the setting unit,
The luminance signal in a frequency band larger than a predetermined frequency;
The luminance signal sampled by the sampling unit
The signal processing apparatus according to claim 1, further comprising a suppression unit configured to suppress a gain of the signal.
3. The digital signal recording device according to 2. Wherein said sampling unit, the recording mode set by said recording mode setting unit
Line thinning is performed on the first color difference signal in accordance with
A first line thinning unit for determining whether or not
According to the recording mode set by the mode setting unit,
Whether to perform line thinning on the second color difference signal
And a second line thinning unit for determining.
2. The digital signal recording device according to claim 1. 6. Before setting by a recording mode setting unit.
The luminance signal is sampled according to the recording mode.
It includes a rate conversion unit that converts the rate
2. The digital signal recording device according to claim 1, wherein 7. The recording mode according to claim 7 , wherein:
Depending on the recording mode set by the setting unit,
The rate change in a frequency band larger than a predetermined frequency.
Suppressing the gain of the luminance signal converted by the conversion unit.
7. The method according to claim 6, further comprising a suppression unit.
The digital signal recording device according to the above. 8. The case where the number of horizontal effective pixels of the video signal is not an integral multiple of the number of horizontal pixels of the macroblock, or the case where the number of vertical effective pixels of the video signal is not an integral multiple of the number of vertical pixels of the macroblock 5. A digital signal recording apparatus for recording a video signal on a recording medium, comprising: a dividing unit that divides the video signal into a plurality of macroblocks; and for each of the plurality of macroblocks, the macroblock corresponds to the horizontal effective pixel. Determining means for determining whether or not the remainder corresponds to the remainder of the vertical effective pixel; generating means for generating a pseudo macroblock having a predetermined pixel value; and Selecting means for selecting one of the macroblock divided by the dividing means and the pseudo macroblock generated by the generating means; Digital signal recording apparatus comprising encoding means for encoding the selected macro block by the selecting means, and recording means for recording a video signal coded by the coded means on the recording medium. 9. All pixel values of the pseudo macro block generated by the generating means are equal, according to claim 8
2. The digital signal recording device according to claim 1. 10. The pseudo macro block generated by the generating means includes a plurality of small blocks,
9. The digital signal recording apparatus according to claim 8 , wherein a pixel value of the pseudo macro block differs for each of the small blocks. 11. A digital signal recording apparatus for recording a digital signal on a recording medium, comprising: a mode setting means for setting a recording mode, wherein the recording mode includes a standard recording mode and a recording time shorter than the standard recording mode. A mode setting unit that is one of long long recording modes, and an encoding unit that encodes a signal with a data amount according to the recording mode set by the mode setting unit, wherein the recording mode is The amount of data when the recording mode is the long-time recording mode is determined by an encoding unit that is smaller than the amount of data when the recording mode is the standard recording mode, and the encoding unit according to the recording mode set by the mode setting unit. Auxiliary data adding means for adding auxiliary data to encoded data, and recording for recording the data with the auxiliary data added to a recording medium And an auxiliary data adding unit that generates auxiliary data according to the recording mode set by the mode setting unit; and an auxiliary data generation unit that generates auxiliary data according to the recording mode set by the mode setting unit. Control means for generating a control signal indicating the insertion position of the auxiliary data, and auxiliary data insertion means for inserting the auxiliary data into the encoded data at the insertion position indicated by the control signal. And the insertion position of the auxiliary data is
Regardless of whether the recording mode is the long-time recording mode or the standard recording mode, the digital means controlled by the control means so as to maintain the periodicity of the insertion position of the auxiliary data. Signal recording device. 12. The recording means, when the recording mode is a standard recording mode, stores the data to which the auxiliary data has been added in an m × (2n + 1) track (m = 2, 4, 6, 6) of the recording medium. ,..., N = 1, 2, 3,...), And when the recording mode is the long-time recording mode, the data to which the auxiliary data has been added is written to 2n + 1 of the recording medium. 12. The digital signal recording apparatus according to claim 11 , wherein the recording is performed by dividing the recording into tracks. 13. A digital signal recording device for recording a digital signal on a recording medium, wherein the digital signal recording device is mode setting means for setting a recording mode, wherein the recording mode includes a standard recording mode and a standard recording mode. A mode setting unit that is one of a long-time recording mode having a longer recording time than the standard recording mode, and an encoding unit that encodes a signal with a data amount according to the recording mode set by the mode setting unit. An encoding means for setting the data amount when the recording mode is the long-time recording mode to 1 / n times the data amount when the recording mode is the standard recording mode; Recording means for recording the data on a recording medium having a plurality of tracks, wherein the recording means responds to a recording mode set by the mode setting means. Address generating means for generating a track address designating one of the plurality of tracks, wherein when the recording mode is a long-time recording mode, a track address circulating with a period of n frames is generated; When the recording mode is the standard recording mode, a digital device comprising: an address generation unit that generates a track address that circulates with one frame as a cycle; and an address addition unit that adds the track address to the encoded data. Signal recording device. 14. The digital signal recording apparatus according to claim 13 , wherein said address generating means further generates a frame address for identifying each frame of the video signal. 15. The digital signal recording according to claim 13 , wherein said address generation means generates a track address having the same value for two adjacent tracks having different azimuths among said plurality of tracks. apparatus. 16. The recording means according to claim 1, wherein said recording means comprises:
When recording a 60-field TV signal, the T
The n frames of the V signal are recorded on 10 tracks, and the current 62
16. The digital signal recording apparatus according to claim 15 , wherein when recording a TV signal of a 5 line-50 field system, n frames of the TV signal are recorded on 12 tracks. 17. The digital signal recording apparatus according to claim 16 , wherein n = 1 in a standard recording mode and n = 2 in a long time recording mode. 18. A signal mode setting means for setting a signal mode, wherein the signal mode is any one of an HDTV signal mode, a wide TV signal mode, and a standard TV signal mode. A / D for performing analog / digital conversion by sampling a video signal including a luminance signal, a first color difference signal, and a second color difference signal at a sampling frequency according to the signal mode set by the signal mode setting means. A conversion means, wherein the sampling frequency when the signal mode is an HDTV signal, the sampling frequency when the signal mode is a wide TV signal, and the signal mode is a standard T
The ratio to the sampling frequency when the signal is a V signal is 4:
A / D conversion means of 2: 1 and effective pixel extraction means for extracting effective pixels from the digitized video signal with the number of samples according to the signal mode set by the signal mode setting means, The ratio between the number of samples when the signal mode is an HDTV signal, the number of samples when the signal mode is a wide TV signal, and the number of samples when the signal mode is a standard TV signal is 4: 2: 1. A certain effective pixel extracting means; a blocking means for dividing the pixel data from the effective pixel extracting means output into rectangular blocks on the screen for each of the luminance signal and the color difference signal; Macroblock generating means for forming one macroblock from the corresponding blocks of the luminance signal, the first chrominance signal, and the second chrominance signal; And a coding means for coding the segment, wherein a coded data amount is controlled to be substantially equal to a predetermined amount in segment units. Recording means for recording data encoded by the encoding means on a recording medium having a plurality of tracks in accordance with the signal mode set by the signal mode setting means, wherein the signal mode is If the signal is an HDTV signal, the encoded data is recorded on 4n tracks (n: a positive integer) per frame, and the signal mode is wide TV.
If the signal is a signal, the coded data is recorded on 2n tracks per frame, and if the signal mode is a standard TV signal, the coded data is recorded on n tracks per frame. A digital signal recording device comprising: recording means for recording data in a digital signal. 19. The A / D converter, when the signal mode is the HDTV signal mode, samples the luminance signal at 40.5 MHz, and converts the first and second color difference signals to 13.5 MHz. When the signal mode is the wide TV signal mode, the luminance signal is sampled at 20.25 MHz, and the first and second color difference signals are sampled at 6.75 MHz. In the case of the standard TV signal mode, the luminance signal is sampled at 10.125 MHz, and the first and second color difference signals are sampled at 3.25 MHz.
19. The digital signal recording device according to claim 18 , wherein sampling is performed at 375 MHz. 20. When the signal mode is the HDTV signal mode, the number of horizontal effective pixels extracted from the video signal by the effective pixel extraction means and the signal mode is wide T
The number of horizontal effective pixels extracted from the video signal by the effective pixel extracting means when the signal mode is the V signal mode, and the number of horizontal effective pixels extracted from the video signal by the effective pixel extracting means when the signal mode is the standard TV signal mode. The ratio to the number of effective pixels is 2: 2: 1, and when the signal mode is the HDTV signal mode, the number of vertical effective lines extracted from the video signal by the effective pixel extraction means and the signal mode are wide. The number of vertical effective lines extracted from the video signal by the effective pixel extracting means when the TV signal mode is set, and the number of vertical effective lines extracted from the video signal by the effective pixel extracting means when the signal mode is the standard TV signal mode. 19. The digital signal recording apparatus according to claim 18 , wherein the ratio to the number of active lines is 2: 1: 1.