JP3066214B2 - Magnetic recording / reproducing 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 high definition VTR, and more particularly to a VT for recording and reproducing a current television signal.
The present invention relates to a high-definition VTR capable of recording and reproducing a high-definition baseband signal in R.

[0002]

2. Description of the Related Art As a VTR for recording and reproducing a high-vision baseband signal, a commercial VTR called UNIHI has been commercialized.

[0003] In July 1991, three domestic companies (Hitachi, Matsushita Electric Industrial Co., Ltd., Sony Corporation) issued a high-vision baseband V intended for consumer use.
There was a proposal for a TR standard. The outline is using a cassette one size larger than the VHS cassette size,
A rotating drum having a diameter of m is rotated at 3600 rpm, and one field of a high-definition signal is divided into two intersecting two-track tracks for recording. Therefore, one frame of the Hi-Vision signal is divided into eight tracks and recorded. The details of the three-company high-vision baseband VTR are described in "Consumer High-Vision VTR Specifications" (published on September 26, 1991, Technical Report of the Institute of Television Engineers of Japan). In addition, the three companies' Hi-Vision baseband V
TR has not been commercialized at present.

[0004] For high-definition broadcasting, MU is used.
Satellite broadcasting by the SE (Multiple Sub-Nyquist Sampling Encoding) method is performed as a test broadcasting for about 8 hours a day. The MUSE system is described in detail in "MUSE-Hi-Vision Transmission System-" (by Ninomiya, edited by the Institute of Electronics, Information and Communication Engineers, published by Corona).

[0005]

However, UNIHI is very expensive because it is a commercial VTR.

[0006] The above-mentioned three-company high-vision baseband VTR is widely used worldwide in VHS-V.
The TR and the drum diameter are the same, but the cassette size is different, so there is no compatibility and there is a problem that the huge software assets of VHS cannot be reproduced.

[0007] Also, since a high-vision baseband VTR of the three-company system has not been commercialized, there is currently no means for recording high-definition broadcasts at ordinary homes.

It is an object of the present invention to enable recording and reproduction of a high-vision baseband signal on a VTR for recording and reproducing a current television signal.

[0009]

Accordingly, in the present invention, the sampling frequency for A / D conversion of the luminance signal Y of the Hi-Vision baseband signal is set to 74.25 MH, which is the sampling frequency of the Hi-Vision studio standard luminance signal Y.
and 29.7MHz is 2/5 of z, HDTV baseband signals color difference signal P _B, the 37.125MHz sampling frequency to convert the P _R A / D, the sampling frequency of the color difference signal of the HDTV studio standard 1 A / D converted color difference signal data is set to 7.425 MHz (1/4 of the sampling frequency 29.7 MHz of the luminance signal) which is / 5, and then time-division multiplexed with the luminance signal data. As a recording signal by adding data such as a sex synchronization signal, the number of 1H samples of the recording signal is set to 1092. Further, the number of recording lines in one track is set to 262.5H, the sampling frequency of the recording signal is set to 17.199 MHz (286,650 times the field frequency of the Hi-Vision signal: 60 Hz), and the recording signal is made similar to the NTSC signal. ing. The number of lines in one frame of the HDTV baseband signal is 1125H.
032H is divided into four tracks, and a number H is added as an area necessary for head switching, so that the number of recording lines in one track becomes 262.5H, which is the same as VHS-VTR. Although the number of effective lines of the Hi-Vision baseband signal is 1035H, the number of effective lines of the MUSE signal obtained by band-compressing the Hi-Vision baseband signal is 1032H, so that there is no practical problem.

A first magnetic head having a first azimuth angle, comprising a pair of magnetic heads having different azimuth angles and arranged close to each other, for recording and reproducing a Hi-Vision baseband signal; A second magnetic head having an azimuth angle of 2 and a third magnetic head having a second azimuth angle, which is arranged to be 180 ° opposite to the first magnetic head on the rotating drum, and comprising a pair of magnetic heads. A magnetic head, the second magnetic head and
Using a fourth magnetic head having a first azimuth angle disposed so as to be opposed to 0 degrees and disposed in close proximity to a third magnetic head, a high-definition signal is output during the first half rotation of the rotating drum. The color difference signal _PR is selected by using the signal of the odd line among the 43 lines to 558 lines of the first field of the first field as the first channel, and the recording is performed by the first magnetic head, and the signal of the even line is obtained. the color difference signals as a second channel performs recording by said second magnetic head select P _B, from 605 lines of the second field of the next high-definition signal at half the rotation of the rotary drum 1120 The signal of the even line of the lines is
Color difference signals as a channel of make recording in the third magnetic head select P _B, the color difference signal a signal in the odd-numbered lines as a second channel select P _R recorded in the fourth magnetic head To do.

When recording a high-vision baseband signal obtained by decoding a MUSE signal, an MU
The number of effective samples of the luminance signal in the recording signal is set to 748, and the number of effective samples of the color difference signal is set to 188 so that the matching with the SE signal is good.

[0012]

According to the structure of the present invention , the sampling frequency for A / D conversion of the luminance signal Y of the Hi-Vision baseband signal is 2/5 of 74.25 MHz, which is the sampling frequency of the Hi-Vision studio standard luminance signal Y. Since the frequency is 29.7 MHz, the band of the luminance signal Y is 14.8.
The effective number of samples at 5 MHz and 1H is 768. Also, the color difference signals PB and PR of the HDTV baseband signal
Is the sampling frequency of the color difference signal of the high-definition studio standard 3
7.425 MHz (2 which is 1/5 of 7.125 MHz)
9.7 MHz), so the color difference signals PB and PR
Is 3.7125 MHz, and the effective number of samples for 1H is 192. When the color difference signal is line-sequentialized and then time-division multiplexed with the luminance signal, the number of samples is 768 + 192 =
It becomes 960 samples. If 110 samples are added to this as a data such as a negative polarity synchronization signal to obtain a recording signal,
The number of 1H samples of the recording signal is 960 + 110 = 109.
It becomes 2. At this time, the sampling frequency of the recording signal is set to 1
If the frequency is 9.199 MHz (286,650 times the 60 Hz field frequency of the Hi-Vision signal), the recording signal can be a signal similar to the NTSC signal.

Further, by dividing the HDTV baseband signals time-axis-multiplexed into two channels, since the number of recording lines of one track and 262.5 H, record 1032 line signal of the effective line of the HDTV baseband signals And the tape pattern recorded on the magnetic tape can be similar to the tape pattern of the VHS-VTR. Also,
Since the channel division is performed so that the azimuth angle of the magnetic head and the odd / even line coincide, the azimuth angle and the type of the color difference signal coincide, and special reproduction becomes possible. Further, since the recording line is set to be the same as the effective video line of the MUSE signal, consistency is improved when recording a high-vision signal obtained by decoding the MUSE signal.

[0014]

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

FIGS. 2 and 3 show the arrangement of heads on a drum and the tape pattern when recording on a magnetic tape according to the present invention. FIG. 2 shows the arrangement of the heads on the rotating drum 1. The magnetic head 2 and the magnetic head 4 have different azimuth angles, and are arranged 180 ° opposite to each other. Then, the magnetic head 3 approaches the magnetic head 2 by 180 °
Similarly, the magnetic heads 5 having different azimuth angles are arranged close to the magnetic head 4 at the opposed positions. The magnetic head 2 and the magnetic head 5 have the same azimuth angle,
The magnetic head 3 and the magnetic head 4 have the same azimuth angle different from the magnetic heads 2 and 5. A magnetic tape 6 as a recording / reproducing medium is wound around the rotary drum 1 by a strong 180 °.

FIG. 3 shows a tape pattern when recording is performed on a magnetic tape using the drum having such a configuration.
In the first 回 転 rotation of the rotating drum, the magnetic heads 2 and 3 form two tracks at different azimuth angles, and in the next 回 転 rotation of the rotating drum, a space for one track is left, and then the magnetic head forms a track. Recording is performed so that two tracks are formed so that the heads 4 and 5 have different azimuth angles but the azimuth angle is reversed from that at the first half rotation, and one rotation of the rotating drum. Record one frame of the video signal. At this time, the running speed of the magnetic tape is VH
It is 33.35 mm / s, the same as the standard mode of the S-VTR, and the track pitch is 19 μm, the same as that of the triple mode of the VHS-VTR. In this manner, the recorded tape pattern has a space for one track every two tracks, but is similar to the tape pattern in the triple mode of the VHS-VTR. A high-quality audio signal or the like may be recorded in tracks vacated every two tracks.

FIGS. 1 and 4 show more detailed examples of the recording tape pattern of the present invention.

FIG. 1 shows a first example of a recording tape pattern according to the present invention.
This is an example. The number of recording lines per track is 262.5H
The number of lines on which the video signal is recorded is 258H for each track, and a 4.5H signal is allocated before and after the video signal line as a margin for head switching. The video signal of one frame to be recorded is 258H × 4, which is 1032H.
The edge portions of the lower end of the tape and the upper end of the tape are head switching points.

In the first half rotation of the rotating drum, recording from the 43rd line to 558 lines of the first field of the high-definition signal is performed, recording is performed by the magnetic head 2 using the signal of the odd line as the channel 1, and the signal of the even line is recorded. Is used as a channel 2 for recording by the magnetic head 3. At this time recording the P _R signals of the odd lines or the channel 1 two color difference signals (or R-Y signals), so that even lines or channels 2, P _B signal (or B-Y signals) are recorded To

In the next 回 転 rotation of the rotating drum, 1120 from the 605 line of the second field of the Hi-Vision signal
Line recording is performed, and the signal of the even line is
The recording is performed by the magnetic head 4, and recording is performed by the magnetic head 5 using the signal of the odd line as the channel 2. At this time it is recording the P _B signal of the even-numbered lines or the channel 1 two color difference signals, P _R signals in the odd lines or channels 2 to be recorded.

When the arrangement of the video signal lines is configured in this manner, the color difference signal and the azimuth angle of the magnetic head coincide with each other, so that the processing for special reproduction is simplified. Also, the video signal area portion (the portion surrounded by a thick frame in the figure) of each field forms a similar rectangle on the magnetic tape.

FIG. 4 shows a second example of the recording tape pattern of the present invention.
This is an example. The difference from the first example shown in FIG.
The only difference is that the channel 1 portion of the field is delayed by 1H (shifted to the left by 1H in the figure). By doing so, the shape of the video signal area portion (thick frame portion) of the second field is lost, but the tracks (tracks) having the same azimuth angle have the same distance (time) from the head switching point to the start of the video signal. To play. In other words, the track (43,
557) and the tracks of the channel 2 of the second field (605, 607, 609 ... 111)
9) has the same azimuth angle, the distance from the head switching point at the lower end of the tape is the same 2.5H, and the distance from the head switching point at the upper end of the tape is the same 2H. Tracks of channel 2 of the first field (44, 46, 48... 558)
And the channel 1 track (606,
608, 610... 1120) have the same azimuth angle, the distance from the head switching point at the lower end of the tape is the same 3H, and the distance from the head switching point at the upper end of the tape is the same 1.5H.
If the distance from the head switching point is the same for magnetic heads having the same azimuth angle, processing for special reproduction or the like becomes easier, and processing for storing video signals in a memory or the like becomes easier. It is easy to expect.

FIG. 5 is a block diagram showing an example of the configuration of the present invention. In FIG. 5, the low-pass filter immediately before the A / D converter and the low-pass filter immediately after the D / A converter are omitted.

The luminance signal Y of the Hi-Vision baseband signal is input to the A / D converter 7, where it is 29.7 MHz.
A / D conversion is performed at the sampling frequency of On the other hand, the color difference signals P _B and P _R of the Hi-Vision baseband signal are input to A / D converters 8 and 9, respectively.
A / D conversion is performed at a sampling frequency of 1 Hz (1/4 of 29.7 MHz). 29.7 MHz, which is the sampling frequency of the A / D converter 7, is 7 which is the sampling frequency of the luminance signal Y according to the high-definition studio standard.
This is 2/5 the frequency of 4.25 MHz. A / D
74.25M which is the sampling frequency of the converters 8 and 9
Hz is the color difference signals P _B and P _R of the HDTV standard
(Or BY, RY), which is 1/5 of the 37.125 MHz sampling frequency. As described above, in the present invention, the sampling frequency of the A / D converter is selected so as to be a simple integer ratio of the sampling frequency of the HDTV studio standard.

The data of the luminance signal Y converted into digital data by the A / D converter 7 stores one frame, which is two fields of the luminance signal Y, for converting a timing from an input signal to a recording signal. The data is input to a Y frame memory 10 as a means, where data of one frame of the recording signal Y is temporarily stored. Meanwhile A / D converter color differences are respectively converted into digital data by 8,9 signal P _B, the data of the P _R are inputted to the vertical filter line sequential circuit 11, where the two 1-line color difference signals The data is converted to line-sequential color difference signals (hereinafter, referred to as C signals) P _B / P _R data by thinning out each half. Vertical filter
The configuration of the line-sequencing circuit 11 will be described later in detail. As for the C signal data output from the vertical filter / line-sequencing circuit 11, one frame of data is temporarily stored in the C frame memory 12 for timing conversion, similarly to the luminance signal Y data.

The data temporarily stored in the Y frame memory 10 and the C frame memory 12 are read out intermittently at a frequency of 34.398 MHz and input to the synchronous addition / two-channel circuit 13. The synchronization adding / two-channeling circuit 13 adds data such as a negative polarity synchronization signal, multiplexes the C signal data and the Y signal data on the time axis, divides the signal into two-channel signals, and outputs 17.199 MHz (field frequency of the HDTV signal). The frequency is 286,650 times the frequency of 60 Hz, and the number 280,650 is the product of the number of samples per line 1092 and the number of lines per track 262.5). Synchronous addition 2
The details of the channelization circuit 13 will also be described later.

The data converted into two channels by the synchronization addition / two-channel conversion circuit 13 is supplied to the D / A converter 1 respectively.
The signals are converted into analog signals at 4, 15 and subjected to emphasis processing suitable for magnetic recording at emphasis circuits 16 and 17, frequency-modulated at FM modulators 18 and 19, and current amplification for recording at recording amplifiers 20 and 21. Then, recording is performed on the magnetic tape 6 by the magnetic heads 2 and 4 and the magnetic heads 3 and 5 simultaneously for two tracks.

The reproduction is basically performed in the reverse order of the recording, and outputs the luminance signal Y and the color difference signals P _B and P _R. Two-channel signals reproduced from the magnetic tape 6 by the magnetic heads 2 and 4 and the magnetic heads 3 and 5 are reproduced by amplifiers 22 and 23.
, And demodulated by FM demodulators 24 and 25, and the reverse of the emphasis processing performed at the time of recording by de-emphasis circuits 26 and 27, and A / D converters 28 and 29
Is converted into digital data. The digital data of the two channels is stored in the time base collector 3
0, 31 where the fluctuation of the time axis such as jitter at the time of reproduction is corrected and input to the one-channel / Y / C separation circuit 32. 1-channel Y / C separation circuit 3
In the recording process 2, the reverse process to that performed by the synchronous addition / two-channel conversion circuit 7 at the time of recording is performed. Further, data such as the synchronization signal added at the time of recording is removed, and the Y signal data and C signal are output.
The signal data is separated, and the Y signal is stored in the Y frame memory 3.
3, the C signal is input to the C frame memory 34. At this time, since the recording and the reproduction are not performed at the same time, the Y frame memory 33 and the C frame memory 34 may be shared with the Y frame memory 10 and the C frame memory 12 used at the time of recording. The data temporarily stored in the C frame memory is input to the interpolation filter 35.

Data of the luminance signal Y is read from the Y frame memory 33, converted into an analog signal by the D / A converter 36, and output as a luminance signal Y of a Hi-Vision baseband signal. On the other hand, the interpolation filter 35 separates the line-sequential P _B and P _R data, and compensates for the lines thinned out by interpolation processing such as taking the average value of the preceding and succeeding lines. The separated P _B and P _R data are converted into analog signals by D / A converters 37 and 38, respectively, and the color difference signals P of the HDTV baseband signal are converted.
_B, is output to a monitor (not shown) as P _R.

FIG. 6 is a block diagram showing an example of the configuration of the vertical filter / line sequential circuit 11. The vertical filter / line sequentialization circuit 11 includes two vertical filters 39 and 40 and a switch 41. If two types of color difference signals are line-sequentialized into one signal, the original signal is thinned out by half. It is well known that transmitting a chrominance signal by decimating it by half does not cause a visual problem, but decimating it by half means that it is sampled. Otherwise, aliasing distortion will occur when the signal is reproduced. So switch 4
Before selecting a signal for each line and line-sequencing by 1,
Each color difference signal is band-limited by vertical filters 39 and 40. As shown in the figure, the vertical filters 39 and 40 have exactly the same configuration. In the vertical filter having the configuration shown in the figure, since the information of the middle line is １ ／ and the information of the upper and lower lines is ず つ from each signal of three consecutive lines, the signal is halved. However, since the information of the lost line is also included in the decimated signal, the band is limited, and even if the signal is reproduced after being sampled, aliasing does not occur.

FIG. 7 shows a synchronous addition / two-channel conversion circuit 13.
1 is a block diagram showing an example of the configuration of FIG. 8 to 10 show the timing charts. FIG. 8 is an example of a timing chart when the video signal of the first field is converted into two channels.

From the synchronization signal generation circuit 42 in which data such as the negative polarity synchronization signal is stored, data such as the negative polarity synchronization signal is output at the timing shown in FIG.
DATA "), 34.39.
It is output intermittently at a sampling frequency of 8 MHz and connected to one terminal of the switch 43. On the other hand, the data temporarily stored in the C frame memory 12 and the Y frame memory 10 also have the timing shown in FIG.
TA, Y DATA ").
It is output intermittently at a sampling frequency of 4.398 MHz and is connected to each switch 44. The switches 43 and 44 switch the input data at appropriate times so that the output data becomes like the TCI data shown in FIG. Although not shown in the timing chart, the synchronization signal generating circuit 42 may output guard data between the C signal and the Y signal. The TCI data is input to the one-line memories 45 and 46. The one-line memories 45 and 46 alternately take in the input TCI data at a sampling frequency of 34.398 MHz as shown in FIG. 8 and read out the input TCI data at a sampling frequency of 17.199 MHz, which is half of the input TCI data. To make continuous data. Thereafter, although not shown in the timing chart, only the data of channel 2 is input to the 3 to 6 line memory 47, where 3
~ 6 line data are output with a delay. The reason why only the data of the channel 2 is delayed is that the data of the two channels of the channels 1 and 2 are simultaneously recorded on the magnetic tape 6 by the magnetic heads 2 and 3 or the magnetic heads 4 and 5 respectively. Is the magnetic head 2
It is physically impossible to arrange the magnetic head 3 or the magnetic head 4 and the magnetic head 5 at the same position, and recording is performed at the same time. Receive. Also 2
If the heads are arranged too far apart, the gap between the tape and the head will not be in good contact with each other, resulting in a problem of poor head contact. Therefore, usually, the distance between the gaps of the two heads is set to be approximately 3 to 6 lines apart. In the present invention, the magnetic head 3 or 5 for recording the signal of channel 2 is arranged in a head arrangement such that the magnetic head 3 or 5 for recording the signal of channel 2 comes into contact with the magnetic tape with a delay from the rotation direction of the drum. Therefore, only the data of channel 2 is delayed by 3 to 6 lines.

FIG. 9 is a timing chart showing signal processing in the second field when the recording tape pattern shown in FIG. 1 is realized.

FIG. 10 is a timing chart showing the processing of the signal of the second field when the recording tape pattern shown in FIG. 4 is realized. Similarly to the tape pattern, the signal of channel 1 is shifted in the direction delayed by 1H.

FIG. 11 shows a first example of the configuration of one line of a recording signal according to the present invention. This is an example when the sampling frequency of the recording signal is 17.199 MHz. As shown in the figure, 1H of the recording signal has a horizontal blanking period of 130 samples (7.56 μs) including the negative synchronization signal portion.
Then, 192 samples (11.16 μs) of the C signal, and 2 samples (0. 1) as a guard between the C signal and the Y signal.
12 μs), followed by 768 samples (44.65 μs)
, And a total of 1092 samples of the Y signal. Data of a total of 1092 samples is 63.49 μs. This value is slightly different from the 1H period (63.55 μs) of the NTSC signal, because the field frequency of the NTSC signal is 59.94 Hz, and the field frequency of the HDTV signal is 60 Hz. When recording, the rotation speed of the rotating drum is NTS
Since it is slightly faster than when recording the C signal, the physical length on the magnetic tape is the same.

The synchronizing signal generating circuit 42 outputs 24 samples as the front porch portion of the negative synchronizing signal, 82 samples as the negative synchronizing signal portion, and 24 samples as the back porch portion of the negative synchronizing signal.
Between the signals, a total of 130 + 2 samples of data of two samples are output. The effective sample number of one line of the luminance signal Y of the HDTV studio standard is 1920. In the present invention, since the sampling frequency is 2/5 of the HDTV studio standard, the sample number is 768, which is 2/5. Also, the color difference signal P _B ,
P number of valid samples in one line of _R is 960, the first sampling frequency is 1/5 because the number of samples also 1/5
There are 92 samples.

The pulse width of the negative polarity synchronizing signal is 4.77 μs for 82 samples, which is almost the same as the pulse width of the negative polarity synchronizing signal of the NTSC signal. Therefore, a sync separation IC of the NTSC specification can be used as it is.

FIG. 12 is a diagram showing a configuration of one line of a recording signal according to claim 7 of the present invention. The configuration of one line of the recording signal is a second example. In this case, 1 is used as a horizontal blanking portion including a negative polarity synchronization signal.
54 samples (8.95 μs), 188 samples (10.93 μs) as C signal, 2 as guard between Y / C
One line is composed of a total of 1092 samples including a sample (0.12 μs) and 748 samples (43.49 μs) as a Y signal. Also at this time, since the sampling frequency of the recording signal is 17.199 MHz, the pulse width of the negative synchronization signal is 4.77 μsec, which is almost the same as the pulse width of the negative synchronization signal of the NTSC signal.
The sync separation IC of the specification can be used as it is.

A second example of this one-line configuration is the MUS
The configuration is convenient for recording a Hi-Vision signal obtained by decoding the E signal. The MUSE signal has a sampling frequency of 16.2 MHz, a sync signal portion of 11 samples, a chrominance signal C portion of 94 samples, a guard between the chrominance signal C and the luminance signal Y of 1 sample, and a luminance signal Y.
480 samples, ie, 374 samples, constitute one line. The MUSE signal is decoded by processing such as inter-frame complementation to double the sampling frequency to 32.
When the signal is time-expanded to 11/12 after setting 4 MHz and the number of samples to 960, the sampling frequency is 32.4 MHz × (11/1) without changing the number of samples.
2) = 29.7 MHz. This frequency coincides with the sampling frequency of the present invention. This signal includes 25 samples of the front porch, 82 samples of the negative synchronization signal portion,
FIG. 12 shows a case where 25 samples of the back porch were added.
Since 22 samples of the synchronization signal portion in the MUSE signal are unnecessary, they may be replaced with signals of the same level as the signal of the back porch portion.

[0040]

As described above, in the magnetic recording / reproducing apparatus according to the present invention , the sampling frequency for A / D conversion of the luminance signal Y of the Hi-Vision baseband signal is equal to the sampling frequency of the luminance signal Y of the Hi-Vision studio standard. 29.7M which is 2/5 of 74.25MHz
Hz, the band of the luminance signal Y is 14.85 MH
The effective sample number of z and 1H is 768. Also, the color difference signals PB and PR of the HDTV baseband signal are A /
The sampling frequency for D-conversion is the sampling frequency of the color difference signal of the HDTV studio standard, 37.1.
Since it is 7.425 MHz (1/4 of the sampling frequency of the luminance signal Y), which is 1/5 of 25 MHz, the band of the color difference signals PB and PR is 3.7125 MHz, the number of effective samples of 1H is 192, and the color difference signal is 192. When time-division multiplexing with a luminance signal is performed after line-sequencing, the number of samples is 76
8 + 192 = 960 samples. When 132 samples are added as data such as a negative polarity synchronization signal to obtain a recording signal, the number of 1H samples of the recording signal is 960 + 1.
92 = 1092. At this time, if the sampling clock of the recording signal is set to 17.199 MHz (286,650 times the field frequency of the HDTV signal, 60 Hz), the recording signal can be made similar to the NTSC signal.

As described above, the magnetic recording / reproducing apparatus according to the present invention divides the time base multiplexed Hi-Vision baseband signal into two channels and sets the number of recording lines per track to 262.5H. The tape pattern recorded on the magnetic tape can be made similar to the tape pattern of the VHS-VTR.

Further, as described above, the magnetic recording / reproducing apparatus according to the present invention has an effect that the processing at the time of special reproduction is simplified since the azimuth angle and the color difference signal correspond one to one.

In the magnetic recording / reproducing apparatus according to the present invention , as described above, the configuration of one line of a recording signal is a configuration convenient for recording a Hi-Vision signal obtained by decoding a MUSE signal. The effect that it becomes possible is produced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first example of a recording tape pattern according to the present invention.

FIG. 2 is a diagram illustrating a head arrangement on a drum according to the present invention.

FIG. 3 is a diagram showing a recording pattern on a tape according to the present invention.

FIG. 4 is a diagram showing a second example of a recording tape pattern according to the present invention.

FIG. 5 is a block diagram showing an example of the configuration of the present invention.

FIG. 6 is a block diagram showing an example of a configuration of a vertical filter / line sequential circuit according to the present invention.

FIG. 7 is a block diagram illustrating an example of a configuration of a synchronization addition / two-channel conversion circuit according to the present invention.

FIG. 8 is a timing chart in the first field of the synchronous addition / two-channel conversion circuit according to the present invention.

FIG. 9 is a timing chart according to FIG. 1 in a second field of the synchronization addition / two-channel conversion circuit according to the present invention;

FIG. 10 is a timing chart according to FIG. 4 in a second field of the synchronization addition / two-channel conversion circuit according to the present invention;

FIG. 11 is a diagram showing a first example showing a configuration of one line of a recording signal according to the present invention.

FIG. 12 is a diagram showing a second example showing the configuration of one line of a recording signal according to the present invention.

[Explanation of symbols]

 1, 2, 3, 4, 5 Rotating drum 6 Magnetic tape 7, 8, 9 A / D converter 10 Y frame memory 11 Vertical filter / line sequential circuit 12 C frame memory 13 Synchronous addition / two-channel circuit 14, 15 D / A converter 16,17 Emphasis circuit 18,19 FM modulator 20,21 Recording amplifier 22,23 Reproduction amplifier 24,25 FM demodulator 26,27 Deemphasis 28,29 A / D converter 30,31 Time Base collector 32 1-channel conversion / Y / C separation circuit 33 Y frame memory 34 C frame memory 35 Interpolation filter 36, 37, 38 D / A converter 39, 40 Vertical filter 41, 43, 44 Switch 42 Synchronization signal generation circuit 45, 46 1 line memory

Claims (7)

(57) [Claims] 1. A storage means capable of storing at least one frame of an image of a Hi-Vision signal, and two magnetic magnets for recording and reproducing a Hi-Vision signal, which are arranged close to each other and have different azimuth angles. A rotary cylinder in which two sets of magnetic head pairs each composed of a magnetic head are disposed so as to be substantially 180 ° opposite each other on a rotary drum, and a first A / D converter for A / D converting a luminance signal of a Hi-Vision baseband signal. Second and third A / D converters for A / D converting the color difference signals PB and PR, respectively, and PB which has been A / D converted by the second and third A / D converters.
Line-sequencing means for line-sequencing the chrominance signals PR and PR; the color difference signal line-sequentialized by the line-sequencing means;
And a time axis multiplexing unit for time axis multiplexing the luminance signal A / D converted by the A / D converter of the first embodiment.
And two channels are simultaneously recorded on the two magnetic head pairs.
A magnetic recording / reproducing apparatus configured to record / reproduce one frame of a Hi-Vision baseband signal using four tracks by one rotation of a rotating drum, wherein the luminance signal Y is transmitted to the first A / D. The sampling frequency for A / D conversion by the converter is set to 29.7 MHz, and the color difference signals PB and PR are converted to A / D signals by the second and third A / D converters.
The sampling frequency to D conversion <br/> and 7.425MHz, of the one line of the recording signal, the effective number of samples of the luminance signal
748, and the number of effective samples of the color difference signal is 188 . 2. A storage means capable of storing at least one frame of video of a high-definition signal, and two magnets for recording and reproducing a high-definition signal, which are arranged close to each other and have different azimuth angles. A rotary cylinder in which two sets of magnetic head pairs each composed of a magnetic head are disposed so as to be substantially 180 ° opposite each other on a rotary drum, and a first A / D converter for A / D converting a luminance signal of a Hi-Vision baseband signal. Second and third A / D converters for A / D converting the color difference signals PB and PR, respectively, and PB which has been A / D converted by the second and third A / D converters.
Line-sequencing means for line-sequencing the chrominance signals PR and PR; the color difference signal line-sequentialized by the line-sequencing means;
And a time axis multiplexing unit for time axis multiplexing the luminance signal A / D converted by the A / D converter of the first embodiment.
And two channels are simultaneously recorded on the two magnetic head pairs.
A magnetic recording / reproducing apparatus configured to record / reproduce one frame of a Hi-Vision baseband signal using four tracks by one rotation of a rotating drum, wherein the luminance signal Y is transmitted to the first A / D. The sampling frequency for A / D conversion by the converter is set to 29.7 MHz, and the color difference signals PB and PR are converted to A / D signals by the second and third A / D converters.
The sampling frequency to D conversion <br/> and 7.425MHz, the digital data comprises at least two D / A converter for converting an analog signal, the digital data of 2 channels that are time-base multiplexed, the field frequency Of 28
A magnetic recording / reproducing apparatus which performs D / A conversion at a sampling frequency of 6,650 × N times (N is a natural number). 3. A storage means capable of storing at least one frame of video of a high-definition signal, and a pair of magnetic heads for recording and reproducing the high-definition signal, which are arranged close to each other with different azimuth angles. A first magnetic head having a first azimuth angle of
A second magnetic head having a second azimuth angle; and a third magnetic head having a second azimuth angle, comprising a pair of magnetic heads, disposed so as to be 180 ° opposite to the first magnetic head on the rotating drum. And a fourth magnetic head having a first azimuth angle and arranged in proximity to the third magnetic head, the first magnetic head being arranged to face the second magnetic head by 180 degrees on a rotating drum. A first A / D converter for A / D converting the luminance signal Y of the Hi-Vision signal; and a second and third converter for A / D converting the color difference signals PB and PR, respectively.
A / D converter, and PB which has been A / D converted by the second and third A / D converters
Line-sequencing means for line-sequencing the chrominance signals PR and PR; the color difference signal line-sequentialized by the line-sequencing means;
A time axis multiplexing means for time axis multiplexing the luminance signal A / D converted by the A / D converter of the above;
Channel dividing means for dividing into two channels, wherein the two head signals divided by the channel dividing means are simultaneously recorded by the magnetic head pair so as to form two tracks, In 1/2 rotation, a magnetic head pair consisting of the first and second magnetic heads records 516 lines from 43 lines to 558 lines of the first field of the Hi-Vision signal. In 回 転 rotation, a magnetic head pair consisting of the third and fourth magnetic heads records 516 lines from 605 lines to 1120 lines in the second field of the Hi-Vision signal. 1035 of the effective line of the frame
A magnetic recording / reproducing apparatus characterized in that 1032 lines among the lines are divided into four tracks and recording is performed by one rotation of a rotating drum. 4. A storage means capable of storing at least one frame of a high-definition signal image, and a pair of magnetic heads for recording and reproducing the high-definition signal, which are arranged close to each other with different azimuth angles. A first magnetic head having a first azimuth angle of
A second magnetic head having a second azimuth angle; and a third magnetic head having a second azimuth angle, comprising a pair of magnetic heads, disposed so as to be 180 ° opposite to the first magnetic head on the rotating drum. And a fourth magnetic head having a first azimuth angle and arranged in proximity to the third magnetic head, the first magnetic head being arranged to face the second magnetic head by 180 degrees on a rotating drum. A first A / D converter for A / D converting the luminance signal Y of the Hi-Vision signal; and a second and third converter for A / D converting the color difference signals PB and PR, respectively.
A / D converter, and PB which has been A / D converted by the second and third A / D converters
Line-sequencing means for line-sequencing the chrominance signals PR and PR; the color difference signal line-sequentialized by the line-sequencing means;
A time axis multiplexing means for time axis multiplexing the luminance signal A / D converted by the A / D converter of the above;
Channel dividing means for dividing into two channels, wherein the two head signals divided by the channel dividing means are simultaneously recorded by the magnetic head pair so as to form two tracks, In 1/2 rotation, recording is performed by the first magnetic head using the signal of the odd line in the first field of the HDTV signal as the first channel, and the signal of the even line is used as the second channel in the second field. In the next 1/2 rotation of the rotating drum, recording is performed by the third magnetic head using the signal of the even-numbered line in the second field of the high definition signal as the first channel. A magnetic recording / reproducing apparatus wherein recording is performed by the fourth magnetic head using a signal of an odd line as a second channel. 5. The number of recording lines per track is 262.5.
And characterized in that the line, before Symbol magnetic recording reproducing apparatus according to claim 2 or claim 3 or claim 4. 6. A color difference signals during the serialization lines, odd lines PR signal or R-Y signal and the even lines are 2 or before Symbol claim to and selects the PB signal or B-Y signals The magnetic recording / reproducing device according to claim 3 or 4. 7. Of the one line of the recording signal, the number of effective samples of the luminance signal 748, SL before the number of effective samples of the color difference signal is characterized in that the 188 claim 2 or claim 3 or the claims Item 5. A magnetic recording / reproducing apparatus according to Item 4.