JPH06189265A - Video signal recorder, video signal reproducing device, and video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To record a high definition video signal without using an expensive high definition video signal recoder and without causing the deterioration of picture quality so that interchangeability with the video signal of a traditional broadcasting system can be attained by specifying the sampling frequency of the high definition video signal. CONSTITUTION:A horizontal synchronizing signal and a vertical synchronizing signal are separated and outputted from the other high-vision signal supplied to a synchronizing signal separation circuit 2. The separated horizontal synchronizing signal is supplied to a first clock generator 3. The generator 3 generates a clock CLK1 phase-locked to m-times higher frequency than the supplied synchronizing signal of, for instance, 33.75kHz (mX33.75kHz), and outputs this clock CLK1 to an A/D converter 5, a memory 6, and a write-in control circuit 7 respectively. Thus, a state that sampling points are arranged vertically on a TV monitor display screen can be generated, and it is convenient for the change of a horizontal blanking period and the arithmetic operation of the intervals of scanning lines, etc.

Description

Detailed Description of the Invention

[0001]

The present invention relates to, for example, an NTSC broadcasting system (a television broadcasting system having 525 scanning lines, an aspect ratio of 4: 3, an interlace ratio of 2: 1 and a field frequency of 59.94 Hz). Video signals of conventional broadcasting system and high-definition broadcasting system (Hi-Vision system.
Video signal recording / reproducing apparatus for selecting and recording any one of high-definition video signals such as 1125 scanning lines, aspect ratio 16: 9, interlace ratio 2: 1, and television broadcasting system having a field frequency of 60 Hz) In addition, for example, a video signal for converting a high-definition broadcast video signal into a video signal having the same field frequency as the NTSC broadcast video signal and a scanning line number that is an integral multiple of the NTSC broadcast system, and recording / reproducing the video signal. The present invention relates to a recording / reproducing device.

[0002]

2. Description of the Related Art Conventionally, there have been the following 1 to 3 as recording / reproducing methods for recording / reproducing a high-definition video signal of a high-definition broadcasting system having a higher definition than a conventional broadcasting system such as an NTSC broadcasting system.

1. As a recording / reproducing method for directly recording / reproducing a high-definition video signal such as high-definition, there is a method using a dedicated recording / reproducing device such as so-called UNIHI or MUSE-VTR.

2. There is a recording / playback method that converts high-definition video signals such as high-definition video signals to conventional broadcast system video signals and records and plays back them on a conventional broadcast system VTR, and performs lower conversion from high-definition video signals to conventional broadcast system video signals. As a converter, Hi-Vision-NTSC converter, MU
There are SE-NTSC converters and the like.

3. A high-definition video signal, which is a high-definition video signal of the conventional broadcasting system such as EDTV II, can be recorded and reproduced by a broadcasting VTR of the conventional broadcasting system.

[0006]

[Problems to be Solved by the Invention] Since the recording / reproducing method of (1) uses a dedicated recording / reproducing apparatus for recording / reproducing a high-definition video signal such as a high-definition broadcasting system, the recording / reproducing apparatus cannot record / reproduce a video signal of a conventional broadcasting system. There was an inconvenience.

Further, the above-mentioned 2. The recording / reproducing method is to convert a high-definition video signal such as a high-definition broadcasting system into a video signal of a conventional broadcasting system, and record / reproduce this with a VTR of a conventional broadcasting system such as the NTSC broadcasting system. The obtained converted video signal is converted into the aspect ratio (16: 9 → 4: 3) and the number of scanning lines is reduced (11
The problem is that the original high-definition video cannot be recorded / reproduced due to 25 lines → 525 lines.

Further, the above-mentioned 3. In, EDT
A high-definition video signal, which is an improved version of a conventional broadcasting system video signal such as V II, cannot be recorded / reproduced by a home VTR at a high-definition resolution (recording / reproduction is possible at the conventional resolution).
There was an inconvenience.

[0009]

In order to solve the above problems, the present invention provides a video signal recording device, a video signal reproducing device, and a video signal recording / reproducing device having the following configurations.

A video signal recording apparatus for recording a high-definition video signal, which has a larger amount of information than that of a conventional broadcasting system video signal, as a converted video signal obtained by converting it into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal. A video signal recording device, wherein the sampling frequency of the high-definition video signal is a common multiple of each horizontal synchronizing signal frequency of the high-definition video signal and the conventional broadcasting system video signal.

A high-definition video signal is obtained by inversely converting a converted video signal obtained by converting a high-definition video signal having a larger amount of information than the conventional broadcasting system video signal into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal. A video signal reproducing apparatus for reproducing a video signal, wherein the sampling frequency of the converted video signal is a common multiple of each horizontal synchronizing signal frequency of the high definition video signal and the video signal of the conventional broadcasting system.

A high-definition video signal having a larger amount of information than that of a conventional broadcast system video signal is recorded as a converted video signal obtained by converting it into an integral multiple of the number of scanning lines of the conventional broadcast system video signal, and the recorded converted video is recorded. A video signal recording / reproducing apparatus for reproducing a high-definition video signal by inversely converting the signal, wherein each sampling frequency of the high-definition video signal and the converted video signal is set to a horizontal level of the high-definition video signal and a conventional broadcasting system video signal. A video signal recording / reproducing apparatus characterized in that it is a common multiple of the frequency of the synchronizing signal.

A video signal recording device for recording at least two systems of conventional broadcasting system video signals as one continuously converted video signal obtained by converting the conventional broadcasting system video signal into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal, A video signal recording device, wherein a sampling frequency used for conversion is an integral multiple of a horizontal synchronizing signal frequency of a conventional broadcasting system video signal.

At least two systems of conventional broadcasting are obtained by inversely converting one converted video signal obtained by converting at least two systems of conventional broadcasting system video signals into an integral multiple of the number of scanning lines of the conventional broadcasting system video signals. A video signal reproducing device for reproducing a standard video signal, wherein the sampling frequency used for the inverse conversion is a common multiple of the horizontal synchronizing signal frequency of the conventional broadcasting system video signal.

At least two systems of conventional broadcasting system video signals are recorded as one converted video signal obtained by converting the number of scanning lines of this conventional broadcasting system video signal into one, and recorded one converted video signal. A video signal recording / reproducing device for reproducing at least two systems of conventional broadcasting system video signals by inversely converting the signals, wherein each sampling frequency used for conversion and inverse conversion is a horizontal synchronization signal frequency of the conventional broadcasting system video signal. A video signal recording / reproducing device characterized by being a common multiple of.

A high-definition video signal having a larger amount of information than that of the conventional broadcasting system video signal is recorded as a converted video signal obtained by converting it into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal, and the recorded converted video is recorded. A video signal recording / reproducing device for reproducing a high-definition video signal by inversely converting the signal, which is used for the conversion and the reverse conversion when the field frequencies of the conventional broadcasting system video signal and the high-definition video signal are different. The sampling frequency was the common multiple of the horizontal synchronizing signal frequency of the conventional broadcasting system video signal and the horizontal synchronizing signal frequency of the high definition video signal, which were obtained assuming that the field frequencies of the conventional broadcasting system video signal and the high definition video signal were the same. A video signal recording / reproducing device characterized by the above.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention generally provides, for example, a video signal recording device, a video signal reproducing device, and a video signal recording / reproducing device capable of recording / reproducing both conventional broadcast system video signals and high-definition video signals. Is.

A video signal recording device, a video signal reproducing device, and a video signal recording / reproducing device according to the present invention will be described below with reference to FIGS. 1 is a block diagram of an embodiment of a video signal recording / reproducing apparatus according to the present invention, FIG. 2 is a block diagram of a frame synchronizing circuit 15 shown in FIG. 1, and FIG. 3 is a block diagram of a video signal recording apparatus according to the present invention. FIG. 4 is a block diagram of an embodiment of a video signal reproducing apparatus according to the present invention, FIG. 5 is a timing chart of H rate, FIG. 6 is a timing chart of V rate, and FIG. 2 is a block diagram of a video signal recording apparatus according to the second embodiment, FIG.
It is a CI encoding timing chart. [Example 1] First, a high-definition video signal having a larger amount of information than the conventional broadcast system video signal is recorded as a converted video signal obtained by converting it into an integral multiple of the number of scanning lines of the conventional broadcast system video signal,
A video signal recording / reproducing apparatus for reproducing a high-definition video signal by inversely converting the recorded converted video signal, wherein the sampling frequencies of the high-definition video signal and the converted video signal are the same as those of the high-definition video signal and the conventional one. A video signal recording / reproducing apparatus characterized in that it is a common multiple of each horizontal synchronizing signal frequency of the broadcasting system video signal will be described.

As a specific example, a case will be described in which a high definition video signal is converted into a converted video signal having twice the number of scanning lines of the conventional broadcasting system video signal, and the converted video signal is recorded and reproduced.

Here, a high-definition video signal of a high-definition broadcasting system (hereinafter referred to as "high-definition signal") is used as a high-definition video signal, and a video signal of an NTSC broadcasting system (hereinafter referred to as "NTSC signal") is used as a conventional broadcasting system video signal. And explain.

The field frequencies of the high-definition signal and the NTSC signal are both 60 Hz (the field frequency of the NTSC signal is 59.94 Hz), and
The horizontal synchronizing signal frequency of the signal is set to 15.75 kHz.

A high-definition signal is a video signal having twice the number of scanning lines of an NTSC signal (hereinafter referred to as "2 × NTSC signal").
Will be described).

The field frequency of the 2 × NTSC signal is 60 Hz (the same as the field frequency of the NTSC signal), and the number of scanning lines is 525 lines / field (NTSC).
Number of signal scanning lines (262.5 lines / field) 2
2), the horizontal sync signal frequency is 31.5 kHz (NTSC
This is twice the horizontal synchronizing signal frequency of the signal, which is 15.75 kHz).

By the way, the number of frame scanning lines of a high-definition signal is 1125, which is 75 more than 1050 which is twice the number of frame scanning lines of 525 of an NTSC signal.

Therefore, if the high-definition signal is converted into the 2 × NTSC signal as described above, the 75 scanning lines of the high-definition signal cannot be converted into the 2 × NTSC signal well.

However, the number of effective scanning lines of the high definition signal is 1035 (MUSE (Multiple Sub-Nyquist
Samping Encoding) video signal (hereinafter referred to as “MUSE
The number of effective scanning lines of the signal) is 1032),
This value is 1 from the 1050 number of scanning lines of 2 x NTSC signal.
Five (18 MUSE signals) are few.

Therefore, even if a high-definition signal with 1035 effective scanning lines is converted into a 2 × NTSC signal with 1050 scanning lines, this 2 × NTSC signal can contain all the video portions of the high-definition signal without omission. . Incidentally, the number of frame scanning lines of the high-definition signal is 1125 and consists of 1035 effective scanning lines and 90 scanning lines in the vertical blanking portion.

By the way, one horizontal scanning period of the high-definition signal is 29.63 μs, and its effective video period is 25.86 μs.
μs (effective video period of MUSE signal is 25.19 μs)
Is. On the other hand, one horizontal scanning period of 2 × NTSC signal is 3
The effective video period is 1.75 μs, which is 26.30 μs, and each period is half the value of the NTSC signal.

Therefore, the values of one horizontal scanning period and the effective image period of the 2 × NTSC signal are values very close to those of the high definition signal.

However, the ratio of the effective video period to one horizontal scanning period of the high-definition signal is 87.28% (2
5.86 μs / 29.63 μs), and the ratio of the effective video period to one horizontal scanning period of the 2 × NTSC signal is 82.
83% (26.30 μs / 31.75 μs), and the difference is 4.45%.

Therefore, the high-definition signal is converted to 2 × NTSC.
When converting to a signal, it is necessary to compress the HDTV signal by 4.45% on the time axis (compressing from 87.28% to 82.83%), and when converting the 2 × NTSC signal back to a HDTV signal, 2 It is necessary to extend the NTSC signal by 4.45% on the time axis (extend from 82.83% to 87.28%).

In order to perform this time-base compression, the digitized high-definition signal is written into the memory with a write clock corresponding to an integral multiple of the horizontal synchronizing signal frequency of the high-definition signal, and the read-out clock for reading from this memory is used. The frequency may be set higher than the frequency of the write clock. Further, in order to perform time axis expansion, the digitized 2 × NTSC signal is written into the memory with a write clock corresponding to an integral multiple of the horizontal synchronizing signal frequency of the 2 × NTSC signal, and then read out from this memory. The clock frequency may be lower than the write clock frequency.

Each sampling frequency, which is the frequency of the write and read clocks used here, is 2 × N.
When synchronized with a frequency that is an integral multiple of the horizontal synchronization signal frequency of the TSC signal, it is possible to create a state in which the sampling points are arranged vertically on a TV monitor display screen (not shown), and to change the horizontal blanking period described later. It is convenient for calculation between scanning lines.

By the way, the horizontal blanking period of the high-definition signal is 3.77 μs, the horizontal blanking period of the 2 × NTSC signal is 5.45 μs, and the horizontal blanking period of the 2 × NTSC signal is different from that of the high-definition signal. is there.

Therefore, the high-definition signal is 2 × NTSC
When converting to a signal, it is necessary to replace the horizontal blanking period of the high-definition signal with the horizontal blanking period of the 2 × NTSC signal (replace 3.77 μs → 5.45 μs). Further, when the 2 × NTSC signal is inversely converted into the high-definition signal, it is necessary to replace the horizontal blanking period of the 2 × NTSC signal with the horizontal blanking period of the high-definition signal (replacing 5.45 μs → 3.77 μs). is there.

Now, mainly considering the points of time-axis compression / expansion and replacement of the horizontal blanking period, the high-definition signal is converted into a 2 × NTSC signal for recording and is also reproduced 2 × NTSC signal. A video signal recording / reproducing apparatus that reversely converts the signal to reproduce a high-definition signal will be described.

As shown in FIG. 1, the video signal recording / reproducing apparatus A comprises a recording system A1 and a reproducing system A2.

The recording system A1 described above has input terminals 1, 3
3, a synchronizing signal separation circuit 2, a first clock generator 3, terminals 4a and 4b, a switch 4 having a movable contact 4c, A /
D converter 5, (frame) memory 6, write control circuit 7, second clock generator 8, terminals 9a and 9b, switch 9 having movable contact 9c, read control circuit 10, signal processing circuit 11, D / It is composed of an A converter 12, a recording signal processing circuit 13, a recording amplifier 14, and a frame synchronization circuit 15.

As shown in FIG. 2, the frame synchronization circuit 15 comprises an A / D converter 34, a (frame) memory 35, a synchronization signal separation circuit 36, a clock generator 37, and a write control circuit 38. 31 is a pair of rotary heads, 3
2 is a magnetic tape.

The reproduction system A2 includes a preamplifier 16, a reproduction signal processing circuit 17, a synchronization signal separation circuit 18, a third clock generator 19, an A / D converter 20, and a write control circuit 2.
1, a first output circuit 22, a second output circuit 23, and output terminals 24 and 39.

The first and second output circuits 22 and 23 have the same structure, and include a memory 25, terminals 26a and 26b, a switch 26 having a movable contact 26c, and a read control circuit 2.
7, fourth clock generator 28, signal processing circuit 29, D
Each of them is composed of an A / A converter 30.

First, a recording operation for recording a high-definition signal will be described. At this time, the movable contact 4c of the switch 4 is switched to the terminal 4a side, and the movable contact 9c of the switch 9 is switched to the terminal 9b side.

The high-definition signal input from the input terminal 1 is supplied to the A / D converter 5 and the sync signal separation circuit 2, respectively. One of the high-definition signals supplied to the A / D converter 5 is A / D converted at the timing of a clock CLK1 which will be described later, and is output to the memory 6 as a digitized high-definition signal.

The horizontal synchronizing signal and the vertical synchronizing signal of the other high-definition signal supplied to the synchronizing signal separating circuit 2 are separately output here. The separated horizontal sync signal is the first
Is supplied to the clock generator 3. The first clock generator 3 supplies m of the supplied horizontal synchronizing signal of 33.75 kHz.
Phase locked to double frequency (m × 33.75 kHz:
m is an integer) clock CLK1 is generated, and this clock C
LK1 is output to the A / D converter 5, the memory 6, and the write control circuit 7, respectively.

Further, the first clock generator 3 is 15.7.
A clock CLK2 having the same frequency as the horizontal synchronizing signal of the NTSC signal of 5 kHz is output to the terminal 4a of the switch 4.

The write control circuit 7 is supplied with the clock CLK1 and the horizontal and vertical sync signals from the sync signal separation circuit 2. Then, based on this, when writing the digitized high-definition signal output from the A / D converter 5 to the memory 6, the write control circuit 7 corresponds to the horizontal and vertical blanking periods. A write control signal for stopping the write operation during the period is output.

As a result, only the data of the period corresponding to the video portion of the digitized high-definition signal is written in the memory 6, so that the memory capacity can be saved to the necessary minimum.

In this way, the data corresponding to the image portion of the high-definition signal is read from the memory 6 in which the data for the period corresponding to the image portion is written in the following manner.

The above-mentioned clock CLK2 output from the first clock generator 3 is supplied to the second clock generator 8 via the terminal 4a of the switch 4 and the movable contact 4c.

The second clock generator 8 is phase-locked to the frequency of 2n times the supplied clock CLK2 (n ×
31.5 kHz (2 × 15.75 kHz): n is an integer)
A clock CLK3 is generated, and this clock CLK3 is used for the memory 6, the read control circuit 10, the signal processing circuit 11, and D.
Output to the / A converter 12 respectively.

As described above, since the data is not written in the memory 6 in the period corresponding to the horizontal and vertical blanking periods of the digitized high-definition signal, the read control circuit 10 writes the data in the memory 6.
A read stop control signal for stopping the read operation in the period corresponding to the horizontal and vertical blanking periods is output.

As a result, the data corresponding to the video portion of the high-definition signal read from the memory 6 is supplied to the signal processing circuit 11 via the terminal 9a of the switch 9 and the movable contact 9c.

The signal processing circuit 11 replaces the data corresponding to the video portion of the high-definition signal supplied here with the data corresponding to the horizontal and vertical blanking periods of the high-definition signal, and horizontal and vertical blanking of the 2 × NTSC signal. Data corresponding to the period is added. In this way, the converted video signal digitized from the signal processing circuit 11 is D
Output to the / A converter 12.

This digitized converted video signal is D /
The converted signal is D / A converted by the A converter 12 and is output to the recording signal processing circuit 13 as an analog converted video signal.

The recording signal processing circuit 13 applies pre-emphasis and F to the supplied converted analog video signal.
After performing necessary recording processing such as M modulation, the converted video signal after this recording processing is output to the recording amplifier 14.

The converted video signal after the recording process is amplified by the recording amplifier 14 by a predetermined amount and then passed through a pair of rotary heads 31 used in a known helical scan VTR,
Magnetic tape such as iron oxide tape or metal tape 3
On the recording medium 2, a known FM-modulated audio signal (or PCM-modulated audio signal) output from an audio signal recording system (not shown) is sequentially and alternately recorded.

This audio signal recording system performs well-known audio signal recording processing such as FM modulation (or PCM modulation) on a two-channel audio signal (for example, both L and R channel stereo audio, multiple audio, etc.).

The converted video signal is subjected to necessary recording processing such as pre-emphasis and FM modulation in the recording signal processing circuit 13, and then recorded on the magnetic tape 32 by the rotary head 31 via the recording amplifier 14. However, as a method other than such recording method,
There are the following.

That is, the above-mentioned analogized converted video signal is supplied to the recording signal processing circuit 13, where the color signals C _W and C _N separated from this converted video signal are time-axis compressed to obtain a luminance signal. Well-known TCI signal (TCI; Time Compressed Inte
gration. Time-axis compression multiplexed signal).

The ratio of the time axis-compressed color signal to the luminance signal in one horizontal scanning period is 1: 4. The color signal C _W is composed of a color difference signal (BY) and the color signal C _N is composed of a color difference signal (RY).

The TCI signal thus constructed is subjected to a signal processing necessary for recording, such as a pre-emphasis process for enhancing a high frequency signal component, an FM modulation after the pre-emphasis process, and an FM-modulated TCI signal. The signal is amplified as a signal by the recording amplifier 14 and has the same structure as the rotary head used in a known helical scan VTR (for example, a diameter of 62 m).
m) and the number of rotations is also the same (for example, 1800 rpm)
Through a pair of rotary heads 31 that are
Alternatively, it is sequentially and alternately recorded on a magnetic tape 32 such as a metal tape together with a known FM-modulated audio signal (or PCM-modulated audio signal) output from an audio signal recording system (not shown).

The rotary head 31 is provided with at least three pairs of recording / reproducing heads provided on the outer peripheral surface of the rotary drum so as to face each other in an angle range of about 180 degrees. Two sets of them are recording / reproducing heads for FM modulated TCI signals, and the remaining one set is a recording / reproducing heads for FM modulated audio signals (or PCM modulated audio signals).

If necessary, one set or two sets for the long-time mode (tape speed 11.12 mm / s) corresponding to the standard recording / reproducing mode (tape speed 33.35 mm / s) are used. It goes without saying that a recording / playback head for FM-modulated TCI signals, a pair of special playback heads, a pair of erasing heads (so-called flying erase heads), etc. can also be mounted at the same time.

The above-described two sets of recording / reproducing heads for FM-modulated TCI signals have one FM-modulated TCI signal (time-axis-compressed color signal C _w and luminance signal) for one field period in each one head. Frequency-multiplexing the TCI signal that is frequency-multiplexed with the FM-modulated TCI signal) and the other FM-modulated TCI signal (time-axis compressed chrominance signal C _N and luminance signal) for the same one field period. Become TC
Simultaneous recording / reproduction is performed with an I-signal FM-modulated TCI signal obtained by FM-modulating the I-signal.

Subsequently, the above-mentioned 1 is repeated for each of the other heads.
Simultaneous recording and reproduction of the one FM-modulated TCI signal for one field period following the field period and the other FM-modulated TCI signal for the same one field period are performed.

Further, the FM using the rotary head 31 described above
The recording / reproduction of the modulated audio signal (or the PCM modulated audio signal) is performed prior to the simultaneous recording / reproduction by the above-described two recording / reproducing heads for the FM-modulated TCI signal (maximum one field period precedent).

The recording order of the three sets of rotary heads 31 is as follows.
An audio signal track is formed on the magnetic tape 32 obliquely with respect to the running direction of the magnetic tape 32 by the head for CM modulated audio signal).

This is followed by two sets of FM modulation T
Two TCI signal tracks are sandwiched between the magnetic tape 32 and the audio signal track by the CI signal head.
Is obliquely formed on the magnetic tape 32 with respect to the traveling direction of Such a recording order is sequentially repeated for each field period.

The reproduction order by the three sets of rotary heads 31 is as follows. First, the head for the FM-modulated audio signal (or the PCM-modulated audio signal) is read by the magnetic tape 3
2 is formed by scanning and reproducing the audio signal track, and subsequently, two TCI signal tracks are formed so as to sandwich the audio signal track by the following two sets of FM modulation TCI signal heads. Are simultaneously scanned and reproduced. Such a reproduction order is sequentially repeated for each field period.

The pair of recording / reproducing heads for each of the two sets of the FM-modulated TCI signal are provided on the outer peripheral surface of the rotary drum as described above, and the first head of the FM-modulated TCI signal is provided.
Scan start position between one head (or the other head) of the pair of recording / reproducing heads of the pair and one head (or the other head) of the pair of recording / reproducing heads of the second set of the FM modulated TCI signal So that the heads (or heads of the other heads) are at the same position in the rotational direction of the rotary drum and the height position of the rotary drum is different. Is provided on the outer peripheral surface of the rotating drum.

Further, the above-mentioned pair of recording / reproducing heads for audio signals is the above-mentioned one head (or the other head) of the above-mentioned first set of FM modulation TCI signal recording / reproducing heads and the second set of FM modulation TCI. Between the one head (or the other head) of the signal recording / reproducing dual head, 2
It is provided at a position preceding the scanning start position of the combined FM-modulated TCI signal recording / reproducing head. The reason for this is to maintain compatibility with conventional VTRs.

As a result, on the outer peripheral surface of the rotary drum, one head of the first set of FM-modulated TCI signal recording / reproducing combined heads is provided at the bottom, and the second set of FM-modulated TCI signal recording / reproducing combined heads is provided at the top. One of the heads, and one of the heads for recording / reproducing audio signals is provided between the two heads, respectively, and the heads are almost 1
On the outer peripheral surface of the rotating drum facing each other with an angle range of 80 degrees, the other head of the FM modulation TCI signal recording / reproducing head of the first set is at the bottom, and the second set of FM modulation T is at the top.
The other head of the CI signal recording / playback head, and
The other head of the recording / reproducing head for audio signals is provided between the both heads.

The recording signal processing performed by the recording signal processing circuit 13 described above can also be performed by the signal processing circuit 11.
In this case, the recording signal processing circuit 13 is not necessary.

Here, the relationship between the sampling frequencies of the clocks CLK1 to CLK3 described above will be summarized.

First, a high-definition signal and 2 × NTSC
The horizontal sync signal frequency ratio of the signal is 15:14. That is, Fh: 2 × Fn = 33.75 kHz: 31.
5 kHz = 15: 14. However, Fh is the horizontal sync signal frequency of the high-definition signal Fn is the horizontal sync signal frequency of the NTSC signal From this relationship, this “m” of the clock CLK1 phase-locked to the frequency of (m × Fh) times is “14a ( a
It is understood that Fn, that is, the clock CLK2 can be obtained by dividing the clock CLK1 having a frequency of (14a × Fh) times by “15a”.

As a result, the first clock generator 3 multiplies Fh supplied from the sync signal separation circuit 2 by 14a to generate the clock CLK1, and divides the obtained clock CLK1 by 15a to generate CLK2. .

Next, the ratio AH of the effective scanning period of the HDTV signal is (1920/2200) (in the case of the MUSE signal, the ratio AHm of the effective scanning period is (1870/2).
200)).

The ratio AN of the effective scanning period of the NTSC signal differs depending on the standard. In the case of the RS-170A standard, the ratio ANr of the effective scanning period is about ((754 ±
3) / 910), and in the case of the SMPTE244M digital composite interface standard, the ratio ANp of the effective scanning period is (768/910).

From the above relationship, the HDTV signal is 2 ×
Considering that the horizontal synchronizing signal period and the horizontal effective period are different between the HDTV signal and the 2 × NTSC signal when converting to the NTSC signal, Fw / Fr = (n / m) × (AN / AH) The effective pixel of the high definition signal is 2 ×
It can be converted to the effective period of the NTSC signal without waste. However,
Fw is the write clock frequency, CLK1 = (m × F
h) times the frequency Fr is the read clock frequency, CLK3 = (n × 2 ×)
Fn) times frequency m is an integer, a multiple of 14, n is an integer, a multiple of 15.

In addition, the above-mentioned high-definition signal and 2 ×
From the above standards relating to the ratio of the horizontal synchronizing signal frequency of the NTSC signal and the ratio of the effective scanning period of the high-definition signal and the NTSC signal, the maximum and minimum relationship of the clock frequency ratios of Fw and Fr can be obtained. That is, (15/14) × (751/910) × (2200/1
920) ≦ Fw / Fr ≦ (15/14) × (768/9)
10) × (2200/1870) where Fr is often used in NTSC signals,
910 × Fn (Fn is the horizontal sync signal frequency 15.75k
If the frequency is doubled, the corresponding Fw is (15/14) × (2200/1920) × 751 × 2
× Fn ≦ Fw Fw ≦ (15/14) × (2200/1870) × 76
8 × 2 × Fn 29.04 MHz = about 861 × Fh ≦ Fw Fw ≦ 903 × Fh = about 30.49 MHz.

Furthermore, since Fw is m times 14a, Fw = 868 × Fh or = 882 × Fh or = 896 × Fh or the like is selected.

At this time, Fr is Fr = 930 × 2 × F
n or = 945 × 2 × Fn or = 960 ×
2 × Fn or the like is selected.

Next, a reproducing operation for reproducing a high-definition signal recorded as a 2 × NTSC signal will be described. At this time, the movable contact 26c of the switch 26 is connected to the terminal 2
It is switched to the 6a side.

The signal reproduced by the rotary head 31 is amplified by the preamplifier 16, processed by the reproduction signal processing circuit 17 such as FM demodulation and de-emphasis, and supplied to the sync separation circuit 18.

The processing up to this point may be performed as follows, for example. The rotary head 31 scans the above-mentioned one and the other FM-modulated TCI signal tracks and FM-modulated audio signal tracks (or PCM-modulated audio signal tracks) formed on the magnetic tape 32, thereby reproducing from each signal track. Get the signal.

FM modulated audio signal track (or PC
The reproduction signal reproduced from the M-modulated audio signal track) is supplied to an audio signal reproduction system (not shown), and after the known audio signal reproduction processing such as FM demodulation or PCM demodulation is performed, the audio of the two channels is reproduced. It is reproduced as a signal (for example, L, R2 stereo sound, multiplex sound, etc.).

The signal reproduced from the FM-modulated TCI signal track is supplied to the preamplifier 16 where it is amplified and then output to the reproduction signal processing circuit 17.

After the above-mentioned reproduction processing, the reproduction signal processing circuit 17 reproduces the TCI signal in a complementary manner with the time-axis compression of the color signal performed at the time of recording and the frequency multiplexing processing of the time-divided color signal and the luminance signal. After processing, i.e. removing frequency multiplexing,
The color-difference signals (BY) and (RY) obtained by expanding the time-axis-compressed color signals C _w and C _N in the time-axis are combined with the luminance signal, and the composite video signal thus obtained, that is, 2 x NTSC
The signals are supplied to the sync signal separation circuit 18 and the A / D converter 20, respectively.

From the reproduction signal processing circuit 17 to the A / D converter 2
One of the 2 × NTSC signals supplied to 0 is A / D converted at the timing of the clock CLK4 described later,
It is output to the memory 25 as a digitized 2 × NTSC signal.

The other 2 × supplied to the sync separation circuit 18.
The NTSC signal has its horizontal synchronizing signal and vertical synchronizing signal separately output. The separated horizontal synchronizing signal is supplied to the third clock generator 19.

The third clock generator 19 supplies the supplied 3
A clock CLK4 phase-locked (q × 31.5 kHz: q is an integer) to a frequency that is q times as high as the horizontal synchronizing signal of the 2 × NTSC signal of 1.5 kHz is generated.
4 is output to the A / D converter 20, the write control circuit 21, and the memory 25, respectively.

Further, the third clock generator 19 is 33.
The clock CLK5 having the same frequency as the horizontal synchronizing signal of the 75 kHz high-definition signal is applied to the terminal 26 of the switch 26.
output to a.

The write control circuit 21 includes the A / D converter 2
When writing the digitized 2 × NTSC signal output from 0 into the memory 25, the writing operation of the memory 25 is performed so that only the data corresponding to the horizontal blanking period of the written digitized 2 × NTSC signal is not written. Control.

The write control circuit 21 is also supplied with the vertical synchronizing signal from the synchronizing signal separating circuit 18, and the data corresponding to the vertical blanking period of the digitized 2 × NTSC signal is not written in the memory 25. Control the write operation.

As a result, only the data corresponding to the video portion of the digitized 2 × NTSC signal can be written in the memory 25, and the memory capacity can be saved to the required minimum. This is the same as when recording.

Digitized 2 × N from memory 25
The reading of the TSC signal is performed as follows. Third
Clock CLK5 output from the clock generator 19 of
Is supplied to the fourth clock generator 28 via the terminal 26a of the switch 26 and the movable contact 26c.

The fourth clock generator 28 is supplied with 3
A clock CLK6 that is phase-locked (r × 33.75 kHz: r is an integer) to a frequency that is r times the frequency of the clock CLK5 that is the same frequency as the horizontal synchronizing signal of the 3.75 kHz high-definition signal is generated, and this clock CLK6 is stored in the memory 2
5, read control circuit 27, signal processing circuit 29, D / A
Output to the converter 30 respectively.

As described above, digitized 2 × N
Since the data corresponding to the horizontal and vertical blanking periods of the TSC signal are not written in the memory 25, the read control circuit 27 digitizes the memory 25 during the read period corresponding to the horizontal and vertical blanking periods. A read stop control signal for stopping the read of the 2 × NTSC signal is output.

In this way, the data of the video portion of the 2 × NTSC signal corresponding to the video portion of the digitized high-definition signal read from the memory 25 is stored in the signal processing circuit 2.
9 is supplied.

The signal processing circuit 29 obtains the data corresponding to the video portion of the digitized high-definition signal supplied thereto by adding the data corresponding to the horizontal and vertical blanking periods of the digitized high-definition signal. D / A converter 30 for digitized high-definition signals
Output to.

The digitized high-definition signal is supplied to the D / A converter 30, where it is D / A-converted and converted into an analog high-definition signal at the output terminal 24.
Is output to.

As described above, the high-definition signal is converted into the 2 × NTSC signal and recorded, and the recorded 2 × NT signal is recorded.
It has been described that the SC signal is inversely converted to reproduce the high-definition signal.

The present invention is not limited to recording / reproducing a high-definition signal using the 2 × NTSC signal as described above, but it is also possible to use a 3 × NTSC signal, 4 × NTS signal.
It goes without saying that a high-definition signal can be recorded and reproduced by using a C signal or the like.

That is, the above-mentioned high-definition signal and 2 ×
Ratio of horizontal sync signal frequency of NTSC signal (Fh: 2 ×
According to Fn = 15: 14), when the 3 × NTSC signal is used, the ratio is (Fh: 3 × Fn = 33.75 kHz
z: 47.25 kHz = 15: 28).

In the case of using the 4 × NTSC signal, the ratio is (Fh: 4 × Fn = 33.75 kHz: 63.
0 kHz = 15: 42).

In each case, the clock CLK is appropriately used.
The frequencies of 1, CLK3, CLK4, and CLK5 may be selected.

Next, at least two conventional broadcast system video signals are recorded as one converted video signal obtained by converting the conventional broadcast system video signal into an integral multiple of the number of scanning lines of the conventional broadcast system video signal, and the recorded one is recorded. Is a video signal recording / reproducing device for reproducing at least two systems of conventional broadcasting system video signals by inversely converting the converted video signal of FIG. A video signal recording / reproducing apparatus having a common multiple of the synchronizing signal frequency will be described.

Here, two systems of NTSC signals are converted into 2 × N.
A case of converting a converted video signal of a TSC signal and recording / reproducing this will be described.

By converting an NTSC signal into a 2 × NTSC signal, two identical scanning line signals can be obtained. Therefore, if this 2 × NTSC signal is recorded, NT is recorded.
The SC signal can be recorded twice. Then, at the time of reproduction, there is an advantage that the S / N ratio is improved by 3 dB when the NTSC signals reproduced twice are added together.

On the other hand, two systems of NTSC signals (for example, 2
Video of two different broadcast programs) is converted into a 2 × NTSC signal and recorded, so that one VTR can simultaneously record two systems of video. This case will be described.

First, the recording operation for recording two systems of NTSC signals will be described. This will be described with reference to FIG. 1 described above. Also, the two systems of NTSC signals are the first and second NT.
This will be described by calling it an SC signal.

At this time, the movable contact 4c of the switch 4 is switched to the terminal 4b side. The movable contact 9c of the switch 9 is alternately switched between the terminals 9a and 9b at intervals of one horizontal scanning period.

First NTSC input from input terminal 1
The signals are supplied to the A / D converter 5 and the sync signal separation circuit 2, respectively. One of the first N supplied to the A / D converter 5
The TSC signal is A / D converted at the timing of the clock synchronized with the horizontal synchronizing signal frequency, and is output to the memory 6 as the digitized first NTSC signal.

The other first NTSC signal supplied to the sync signal separation circuit 2 is separated and output as its horizontal sync signal and vertical sync signal. The separated horizontal synchronizing signal is supplied to the first clock generator 3 and the terminal 4b of the switch 4, respectively.

The first clock generator 3 is supplied with the first clock
Generates a clock whose phase is locked to the frequency of the horizontal synchronizing signal of the NTSC signal, and uses this clock in the A / D converter 5,
The data is output to the memory 6 and the write control circuit 7, respectively.

The write control circuit 7 is supplied with the clock and the vertical synchronizing signal from the synchronizing signal separating circuit 2. Then, based on this, the write control circuit 7 causes the memory 6
On the other hand, the digitized first NTSC signal output from the A / D converter 5 is written in the memory 6.

Digitized NTSC from memory 6
The signal is read out as follows.

The horizontal synchronizing signal separated by the synchronizing signal separating circuit 2 is supplied to the second clock generator 8 via the terminal 4b of the switch 4 and the movable contact 4c.

The second clock generator 8 is a clock CL whose phase is locked to twice the frequency of the supplied horizontal synchronizing signal.
K7 is generated, and this clock CLK7 is used for the memory 6, the read control circuit 10, the signal processing circuit 11, the D / A converter 1.
2. Output to the frame synchronization circuit 15, respectively.

The read control circuit 10 instructs the memory 6 to
The first NTSC signal converted into 2 × NTSC read from this is composed of video signal data corresponding to odd-numbered (or even-numbered) scanning lines and no-signal data corresponding to even-numbered (or odd-numbered) scanning lines. Thus, the read control is performed so as to output the alternating signal.

Thus, the first NTS digitized
The C signal is read from the memory 6 to the terminal 9a of the switch 9 as the digitized alternating signal. Then, the digitized first N is obtained every horizontal scanning period.
The TSC signal is supplied to the signal processing circuit 11 via the terminal 9a of the switch 9 and the movable contact 9c.

The second NTSC signal input from the input terminal 33 is supplied to the A / D converter 34 and the sync signal separation circuit 36 in the frame sync circuit 15, respectively. A /
One of the second NTSC signals supplied to the D converter 34 is A / D converted and digitized into the second NTS signal.
It is output to the memory 35 as a C signal.

The horizontal synchronizing signal and the vertical synchronizing signal of the other second NTSC signal supplied to the synchronizing signal separating circuit 36 are separately output here. The separated horizontal synchronizing signal is supplied to the clock generator 37.

The clock generator 37 receives the supplied second N
A phase-locked clock is generated in synchronization with the horizontal synchronizing signal frequency of the TSC signal, and this clock is generated by the A / D converter 3
4, output to the memory 35 and the write control circuit 38, respectively.

The write control circuit 38 is supplied with the clock and the vertical synchronizing signal from the synchronizing signal separating circuit 36. Then, based on this, the write control circuit 38 outputs the second digitalized signal output from the A / D converter 34.
Write the NTSC signal of

The reading of the digitized second NTSC signal from the memory 35 is performed as follows.

This memory 35 is used by the second clock generator 8
To the clock CLK7 that is phase-locked to twice the frequency of the horizontal synchronizing signal of the first NTSC signal, and the read control signal from the read control circuit 10.

In the read control circuit 10, the second NTSC signal converted from 2 × NTSC read out from the memory 35 is read to the memory 35 and the video signal data corresponding to the even-numbered (or odd-numbered) scanning line and the odd-numbered scanning signal. The read control is performed so that the signal is output as an alternating signal like no signal data corresponding to (or an even number).

In this way, the second NTS digitized
The C signal is read from the memory 35 to the terminal 9b of the switch 9 as the digitized alternating signal. Then, the video partial data signal is supplied to the signal processing circuit 11 via the terminals 9b and 9c of the switch 9 every one horizontal synchronizing signal period.
Is supplied to.

The movable contact 9c of the switch 9 can be alternately switched between the terminals 9a and 9b every horizontal scanning period. Therefore, during the first horizontal scanning period, the switch 9 is switched to the terminal 9a, and the video part data of the digitized first NTSC signal is supplied to the signal processing circuit 11.

During the subsequent second horizontal scanning period, the switch 9 is switched to the terminal 9b and the digitized video portion data of the second NTSC signal is supplied to the signal processing circuit 11.

Similarly, in the subsequent third horizontal scanning period, the switch 9 is switched to the terminal 9a, and the digitized video portion data of the first NTSC signal is supplied to the signal processing circuit 11.

The signal processing circuit 11 continuously digitizes the supplied video-partial data supplied intermittently between the supplied first and second digitized NTSC signals into a digitized 2 × N format.
The TSC signal is output to the D / A converter 12.

The digitized 2 × NTSC signal is supplied to the D / A converter 12, where it is D / A converted and output as the analogized 2 × NTSC signal.

The analogized 2 × NTSC signal is supplied to the recording signal processing circuit 13 and subjected to processing such as pre-emphasis and FM modulation required for recording, and the recording amplifier 14
Together with a known FM-modulated audio signal (or PCM-modulated audio signal) output from an audio signal recording system (not shown) on the magnetic tape 32 such as an iron oxide tape or a metal tape via the rotary head 31. It is recorded sequentially and alternately.

This audio signal recording system performs well-known audio signal recording processing such as FM modulation (or PCM modulation in addition to this) of a 2-channel audio signal (for example, stereo audio of L and R channels, multiplex audio, etc.). .

In addition to this method, the above-described recording processing is performed by using the above-mentioned FM-modulated TCI signal. However, this processing is the same as that described above, and the description thereof is omitted here.

As described above, a signal containing another program signal (first and second NTSC signals) for each scanning line is completed.

Next, the reproducing operation for reproducing the two systems of NTSC signals will be described. At this time, the movable contact 26c of the switch 26 is switched to the terminal 26b side.

The signal reproduced by the rotary head 31 is amplified by the preamplifier 16, processed by the reproduction signal processing circuit 17 such as FM demodulation and de-emphasis, and supplied to the sync separation circuit 18 to separate the sync signal. .

One of the 2 × supplied to the sync separation circuit 18
The NTSC signal has its horizontal synchronizing signal and vertical synchronizing signal separately output. The separated horizontal synchronizing signal is supplied to the third clock generator 19 and the terminal 26b of the switch 26, respectively.

The third clock generator 19 generates a clock CLK8 phase-locked (s × 31.5 kHz: s is an integer) at a frequency s times as high as the horizontal synchronizing signal of the supplied 2 × NTSC signal. This clock CLK8 is A / D
The data is output to the converter 20, the write control circuit 21, and the memory 25, respectively.

The other 2 × NTSC signal output from the reproduction signal processing circuit 17 is supplied to the A / D converter 20, where it is A / D converted and outputs a digitized 2 × NTSC signal. The digitized 2 × NTSC signal outputs, for each scanning line, the video part data of the odd-numbered scanning line and the even-numbered scanning line in the first and second output circuits 22 and 23.
It is distributed and supplied to.

Since the first and second output circuits 22 and 23 have the same structure, only the second output circuit 23 will be described and the description of the first output circuit 22 will be omitted.

Although not shown here, the same switch as the two-contact changeover switch 9 described above is connected between the A / D converter 20 and the first and second output circuits 22 and 23. .

That is, on the output side of the A / D converter 20, the movable contact of the switch (similar to the terminal 9c), the first output circuit 2
One fixed contact (similar to terminal 9b) of the switch is connected to the input side of 2, and the other fixed contact (similar to terminal 9a) of the switch is connected to the input side of the second output circuit 23.

Therefore, this switch (not shown) is switched every horizontal scanning period, and is set to the first for the odd-numbered scanning lines.
To the input side of the output circuit 22 and the input side of the second output circuit 23 in the case of even-numbered scanning lines.

The digitized 2 × NTSC signal of the even-numbered scanning lines distributed to the second output circuit 23 is written in the memory 25. Data is not written during the period corresponding to the odd scan lines.

Reading from the memory 25 is performed by the switch 2
A fourth clock generation circuit 28 phase-locked to a frequency that is t times the frequency of the horizontal synchronization signal from the synchronization signal separation circuit 18 supplied via the terminal 26b of 6 and the movable contact 26c.
Clock CLK9 (t × 15.75 kHz: t is an integer).

Since the blanking portion was not written at the time of writing, the reading control circuit 27 controls the reading to stop reading during the period corresponding to blanking.

The read signal is added with a synchronizing signal or the like by the signal processing circuit 29 and then converted into an analog signal by the D / A converter 30. The even-numbered second NTSC signal converted into the analog signal is output from the output terminal 24.

By the same reproduction scan, the odd-numbered first N converted from the first output circuit 22 into the analog signal.
The TSC signal is output from the output terminal 39.

By the above, 2 × NTSC signals can be transmitted.
It becomes possible to convert into an NTSC signal converted video signal and record / reproduce this. [Embodiment 2] In the above-mentioned [Embodiment 1], a high-definition signal is converted into a 2 × NTSC signal, or two systems of NTSC signals are converted into a 2 × NTSC signal, and signals of a plurality of frequency bands are obtained. Since it was recorded and reproduced by the rotary head 31 as it is without being divided into parts, the frequency band of the 2 × NTSC signal to be recorded and reproduced is as wide as that of the high-definition signal. Therefore, a broadband recording system A1 and a reproducing system A2 are required.

Therefore, it is conceivable to divide the 2 × NTSC signal into signal portions of a plurality of frequency bands and record and reproduce each divided signal portion by a plurality of corresponding rotary heads. This method will be described using the case of [Example-1] described above.

In [Example 1], the high-definition signal was converted into a 2 × NTSC signal with 1050 scanning lines.
In [Example-2], the NTSC signal is converted into two systems of 525 scanning lines.

A specific method will be described with reference to FIGS. The same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. An explanation will be given when the input signal is a high-definition signal.

The video signal recording / reproducing apparatus B is composed of a recording system B1 and a reproducing system B2, as shown in FIGS. 3 and 4, respectively.

The recording system B1 described above includes an input terminal 1, a synchronizing signal separation circuit 2, a first clock generator 3, a terminal 4a,
4b, a switch 4 having a movable contact, an A / D converter 5,
Write control circuit 7, second clock generator 8, read control circuit 10, (frame) memories A, B 40, 4
1, signal processing circuits 42 and 43, D / A converters 44 and 4
5, recording signal processing circuits 46 and 47, recording amplifiers 48 and 4
It is composed of a pair of rotary heads 50 and 51 of 9 and 2 sets.

One system for converting a high-definition signal into two systems of NTSC signals is (frame) memory A40,
A signal processing circuit 42, a D / A converter 44, a recording signal processing circuit 46, a recording amplifier 48, and a pair of rotary heads 50.

The other system is a (frame) memory B41, a signal processing circuit 43, a D / A converter 45, a recording signal processing circuit 47, a recording amplifier 49, and a pair of rotary heads 5.
It consists of 1.

Further, the memories 40 and 41 are the memory 6 and
The signal processing circuits 42 and 43 are the same as the signal processing circuit 11 and the D / A.
The converters 44 and 45 have the same configuration as the D / A converter 12, the recording signal processing circuits 46 and 47 have the same configuration as the recording signal processing circuit 13, and the recording amplifiers 48 and 49 have the same configuration as the recording amplifier 14, respectively, and therefore description thereof is omitted. To do.

The high-definition signal applied to the input terminal 1 and digitized by the A / D converter 5 is stored in the memory A4.
0, supplied to the memory B41. When writing to memory
The blanking portion is not written in order to increase the memory capacity, and the writing control circuit 7 controls writing in the memory alternately for each scanning line.

Reading from the memories 40 and 41 is carried out when the input signal is a high-definition signal and the movable contact 4 of the switch 4 is read.
c is connected to the terminal 4a side, and is a clock (n × 15.75 kHz: n × 15.75 kHz :) of the second clock generator 8 phase-locked to the horizontal synchronizing signal frequency (15.75 kHz) of the NTSC signal.
(n is an integer).

Since the blanking portion was not written at the time of writing, the reading control circuit 10 controls the reading from the memories 40 and 41 so as to stop the reading during the period corresponding to the blanking.

The read signal is output to the signal processing circuit 42,
After adding a synchronizing signal and the like by 43, the D / A converter 4
It is converted into an analog signal at 4,45. The signals converted into analog signals are used for pre-emphasis and F necessary for recording.
Processing such as M modulation is performed by recording signal processing circuits 46 and 47, amplified by recording amplifiers 48 and 49, and recorded on a magnetic tape (not shown) by two pairs of rotary heads 50 and 51 almost at the same time.

In this way, the high-definition signal is sent to the two systems of N.
It can be converted into a TSC signal and recorded.

Next, a reproducing process for reproducing a high-definition signal from two recorded NTSC signals will be described with reference to FIG.

The reproducing system B2 described above includes the preamplifier 52,
53, reproduction signal processing circuits 54 and 55, synchronization signal separation circuits 56 and 57, clock generators 58 and 59, A / D converters 60 and 61, write control circuits 62 and 63, (frame) memories C, D64 and 65. , Switches 26 and 66, read control circuit 27, clock generator 28, signal processing circuit 29, D / A converter 30, and output terminal 24. The same components as those described above are designated by the same reference numerals,
The description is omitted.

One of the systems for inversely converting two systems of NTSC signals into a high-definition signal is a pair of rotary head 50, preamplifier 52, reproduction signal processing circuit 54, synchronization signal separation circuit 56, clock generator 58, A / D conversion. It comprises a container 60, a write control circuit 62, and a (frame) memory 64.

The other system is a pair of rotary heads 5.
1, preamplifier 53, reproduced signal processing circuit 55, synchronization signal separation circuit 57, clock generator 59, A / D converter 6
1, a write control circuit 63, and a (frame) memory 65.

Furthermore, the preamplifiers 52 and 53 are the preamplifier 16, the reproduction signal processing circuits 54 and 55 are the reproduction signal processing circuit 17, the synchronization signal separation circuits 56 and 57 are the synchronization signal separation circuit 18, and the clock generator 58, 59 is the third clock generator 19 and A / D converters 60 and 61 are A / D converters.
Since the D converter 20, the write control circuits 62 and 63 have the same configuration as the write control circuit 21, and the memories 64 and 65 have the same configuration as the memory 25, respectively, description thereof will be omitted.

The signals reproduced by the two pairs of rotary heads 50, 51 are amplified by the preamplifiers 52, 53, and the reproduced signal processing circuits 54, 55 perform FM demodulation, de-emphasis, etc., and the sync separation circuit. Supplied to 56, 57,
The sync signal is separated.

The separated synchronizing signal is supplied to the clock generating circuits 58 and 59 and phase-locked to a frequency q times the frequency of the horizontal synchronizing signal of 15.75 kHz (q × 15.
75 kHz: q is an integer) clock.

The clock generation circuits 58 and 59 are simultaneously set to 3
The same clock as the horizontal synchronizing signal frequency of the 3.75 kHz high-definition signal is generated and supplied to the switch 26.
The generated clock is the A / D converter 60, 61, the memory 6
4, 65, and the write control circuits 62 and 63.

At the same time, the reproduced signals are A / D converters 60, 6
1 and is converted into a digital signal. The digitized signal is once written in the memories 64 and 65. When writing to the memory, the write control circuit 6 is configured so that the blanking portion is not written in order not to increase the memory capacity.
The control is performed by 2, 63.

On the other hand, when reading from the memories 64 and 65, when the reproduction signal is a high-definition signal, the switch 26 is connected to the clock side b generated by the clock generation circuit 59, and the horizontal synchronizing signal frequency (33.7) of the high-definition signal is generated.
The clock (r × 33.75 kHz) of the clock generation circuit 28 that is phase-locked to a frequency that is r times the frequency of 5 kHz.
z: r is an integer).

Since each horizontal synchronizing signal is divided during recording,
When the memory is read, the divided signals are connected together. Since the blanking portion was not written at the time of writing, the reading control circuit 27 controls the reading to be stopped during the period corresponding to the blanking at the time of reading, and the memories 64 and 65 to be read alternately every horizontal synchronizing signal period of the high-definition signal. To do.

The read signal is added with a synchronizing signal and the like by the signal processing circuit 29 and then converted into an analog signal by the D / A converter 30. The high-definition signal converted into an analog signal is output from the output terminal 24.

Timing Chart The memory control during recording will be further described with reference to FIGS. 5 (H rate) and 6 (V rate).

Here, the H rate timing is related to various write control signals for stopping the horizontal blanking period of the high definition signal by the write control circuit 7 and the writing of the high definition signal data to the memories 40 and 41. Timing or read control circuit 10
Are various timings related to the read control signal for stopping the reading of the high-definition signal data from the memories 40 and 41 during the horizontal blanking period of the high-definition signal.

Further, the V rate timing means various kinds of write control signals for stopping the writing of the data of the high-definition signal to the memories 40 and 41 during the vertical blanking period of the high-definition signal by the write control circuit 7. The timing or various timings related to the vertical blanking period of the high-definition signal by the read control circuit 10 and the read control signal for stopping the reading of the data of the high-definition signal from the memories 40 and 41.

The write H rate timing is as follows. First, since the horizontal blanking period of the high-definition signal is not written in the memories 40 and 41, the write enable of the memories 40 and 41 is set to non-active (L) during this blanking period.

In order to alternately write the effective pixel data to the memories 40 and 41 for each scanning line, the write enable of each memory 40 and 41 is turned on / off for each scanning line (here,
The sampling frequency was 868 times fH, and the number of effective pixels was 768).

Here, the "HD input signal" shown in FIG. 5 (A) is a high-definition signal, and the "HD H signal shown in FIG. 5 (B).
"SYNC" is a horizontal synchronizing signal of the high-definition signal.
“WRITE E A” shown in FIG. 7C is a write control signal output from the write control circuit 7 to the memory A 40, and is “H” when writing data and “L” when the writing is stopped. .

"WRITE E B" shown in FIG.
Is a write control signal output from the write control circuit 7 to the memory A41, which is "H" when writing data, "L" when the writing is stopped, and "HD76".
“8 CLK” indicates that the number of effective pixels for writing high-definition signal data is 768.
“K” indicates that the sampling frequency of the high-definition signal data in one horizontal scanning period is 868 × fH (fH: horizontal synchronizing signal frequency).

"15.75 kHz" shown in FIG. 13E shows the horizontal synchronizing signal frequency of the NTSC signal, and FIG.
“READ E” shown in FIG. 2 is a read control signal output from the read control circuit 10 to the memories A, B 40, 41, respectively, and is “H” when reading data, and is “L” when reading / writing is stopped. Yes, "NT76
“8 CLK” indicates that the number of effective pixels for reading NTSC signal data is 768, and “NT910CLK = H”
"D1860CLK" has a sampling frequency of 910 × fH in one horizontal scanning period of NTSC signal data, and the sampling frequency of this NTSC signal is 910.
× fH is the sampling frequency of the HDTV signal is 18
It indicates that the value is equal to 60 × fH.

[1 / 2HDSIG] shown in FIG.
“A” indicates the output signal of the recording amplifier 48, and “½HDSIG B” shown in FIG. 7H indicates the output signal of the recording amplifier 49.

The write V rate (odd field) timing is as follows. Since the vertical blanking period of the high-definition signal is not written in the memories 40 and 41, the write control circuit 7 causes the vertical synchronization signal of the high-definition signal (the signal shown in FIG. 6A, HD DELAYE).
DV) i horizontal sync signal of high-definition signal delayed by 40 lines (scan line) (signal shown in FIG. 6B, HD
HSYNC) j is generated, and the line address of the memories 40 and 41 is reset at the 41st line of the effective scanning line (signal shown in FIG. 6C, HD input signal line address) k (signal shown in FIG. 6D). , Address reset) 1 and set its write enable to active (H) (signal shown in FIG. 6E, WRITE EN) m, and the memories 40, 4
Start writing to 1.

Further, the write enable m is set to non-active (L) on the 517th line where the effective scanning line k ends, and the writing to the memories 40 and 41 is completed.

The memories 40 and 41 written in this way
As for the H rate of reading from, the high-definition signal data for one line of each 768 pixels written in the memories 40 and 41 is continuously read, and the read enable is set to non-active for the time corresponding to the horizontal blanking period. Set to (L). The two memories 40 and 41 are simultaneously read out and converted into a signal having the same number of scanning lines as the two NTSC signals (the same horizontal scanning frequency) and output.

Here, "NTSC D" shown in FIG.
ELAYED V) n is a vertical synchronizing signal obtained by delaying the NTSC signal, “NTSC HSYNC” shown in FIG.
o is a horizontal synchronizing signal of the NTSC signal.

The "output signal A line address" p shown in FIG. 13H is the output signal of the recording amplifier 48, and is the odd field of the high-definition signal, odd horizontal scanning period (1, 3, 5, ..., 479, 481, 483, 485
...) corresponding to the NTSC signal is output, and the "output signal B line address" q shown in (I) is an output signal of the recording amplifier 49 and is an odd field of the high-definition signal. , Even horizontal scanning period (2,
4, 6, ..., 480, 482, 484, 486, ...) are output. The “address reset” r shown in FIG.
Signals for resetting the line address of 41 are shown respectively.

The write V rate (even field) timing is as follows. Since the vertical blanking period of the high-definition signal is not written in the memories 40 and 41, the write control circuit 7 causes the vertical synchronization signal of the high-definition signal (the signal shown in FIG. 6K, HD DELAYE).
The horizontal synchronizing signal of the high-definition signal delayed by 602 lines (scanning line) from DV) s (the signal shown in FIG. 6 (L), H
D HSYNC) t is generated and the 603rd line of the effective scanning line (signal shown in FIG. 6M, HD input signal address)
u resets the line address of the memories 40 and 41 (signal shown in FIG. 6N, address reset) v, and sets its write enable to active (H) (signal shown in FIG. 6 (O), WRITE EN) w. , Writing to the memories 40 and 41 is started.

Further, the effective scanning line u ends 1120.
Write enable m is non-active (L) on the line
Then, the writing to the memories 40 and 41 is completed.

The memories 40 and 41 written in this way
As for the H rate of reading from, the high-definition signal data for one line of each 768 pixels written in the memories 40 and 41 is continuously read, and the read enable is set to non-active for the time corresponding to the horizontal blanking period. Set to (L). The two memories 40 and 41 are simultaneously read out and converted into a signal having the same number of scanning lines as the two NTSC signals (the same horizontal scanning frequency) and output.

Here, "NTSC D" shown in FIG.
ELAYED V) x is a vertical synchronizing signal obtained by delaying the NTSC signal, “NTSC HSYNC” shown in FIG.
y is a horizontal synchronizing signal of the NTSC signal.

The "output signal A line address" z shown in (R) of the figure is the output signal of the recording amplifier 48, and is the even field of the high-definition signal, odd horizontal scanning period (1, 3, 5, ..., 515, 515). NTSC according to 517)
It shows that a signal is output, and also in the same figure (S).
The “output signal B line address” aa shown in FIG. 2 is an output signal of the recording amplifier 49, and is an even field of the high-definition signal, an even horizontal scanning period (2, 4, 6, ...
It shows that the NTSC signal according to 6) is output. "Address reset" bb shown in FIG. 9 (T) shows signals for resetting the line addresses of the memories 40 and 41, respectively.

Next, the control of the memory during reproduction will be described.

Strictly speaking, the write timing to the two memories 64 and 65 is the skew of the reproduction of the respective signals,
Although it depends on the jitter, it can be regarded as the same at the H or V rate, and therefore the description is omitted.

The timing of the H rate of writing is as follows. First, since the horizontal blanking is not written in the memory, the write enable is set to non-active (L) during the blanking period.

At the V rate timing, since the vertical blanking is not written to the memory, a signal delayed from the vertical synchronizing signal is generated, the line address is reset at the beginning of the effective scanning line, the write enable is activated, and the memory is stored in the memory. Start writing.

Further, when the effective scanning line is completed, the write enable is made inactive and the writing is completed.

For the H rate of reading, the data of one line of 768 pixels written in the memory is continuously read, and the read enable for the time corresponding to blanking is made inactive. In order to read effective pixel data for each scanning line from the memories C and D, the read enable of each memory is turned on / off for each scanning line (here, the sampling frequency is 868 times fH, and the number of effective pixels is 76).
8 pixels).

The method of converting a high-definition signal into a signal having twice the number of scanning lines as the NTSC signal and further dividing the signal into two signals for recording / reproduction has been described above. At the time of this division, although it was divided for each scanning line, it is also possible to convert and record in the same manner for each screen or each pixel. [Example-3] [Example-1] and [Example-] described above.
[2] describes only the signal conversion of the luminance signal of the video signal, respectively, but the number of scanning lines can be similarly converted for the color signal.

The color signal recording method is a low-frequency conversion color method, an FM / FM multiplexing method,
A color signal is multiplexed with a luminance signal using any method such as TCI (Time Compressed Integration) method, or so-called MII format VT
There is a method of recording by providing a color signal track separately from the luminance signal track as in R. Of these, the low-frequency conversion color system, the FM / FM multiplexing system, and the like are easy to multiplex if the time axis conversion is possible, and therefore the description thereof is omitted here.

A description will be added to the TCI method. TCI
The method is a method of time-division multiplexing a luminance signal and a color signal.
Since the band of the color signal is narrower than the band of the luminance signal, the normal color signal is time-compressed from 1/2 to 1/5 of the luminance signal. Here, a case of compressing to 1/3 will be described.

In the above-mentioned [Embodiment 1] and [Embodiment 2], the high-definition signal is converted into the signal of the horizontal sync signal having the frequency which is an integer multiple (1 or more) of the horizontal sync signal frequency of the NTSC signal. Now, the TCI method will be described by taking the case where 896 × Fh is selected as the sampling frequency of the high-definition signal in [Example 1].

In the effective scanning period of the high-definition signal, the luminance signal is sampled by 768 samples, and the chrominance signal is sampled by 256 samples with a clock having a frequency of 1/3. Further, since the vertical resolution of the color signal may be narrower than that of the luminance signal, the two color signals Pr,
Pb is line-sequentially recorded.

A specific method will be described with reference to FIGS. 7 and 8. FIG. 7 is a block diagram of the video signal recording apparatus according to the second embodiment of the present invention, and FIG. 8 is a TCI encoding timing chart.

The video signal recording / reproducing apparatus C has a recording system C1 as shown in FIG. The recording system C1 includes a luminance signal input terminal 1, a synchronizing signal separation circuit 2, a first clock generator 3, terminals 4a and 4b, a switch 4 having a movable contact 4c, an A / D converter 5, (frame ) Memory 6, write control circuit 7, second clock generator 8, read control circuit 10, signal processing circuit 11, D / A converter 12, not shown, recording signal processing circuit 13, not shown, recording, not shown Amplifier 14, color signal Pr input terminal 71, color signal Pr input terminal 72, third clock generator 75, A / D converter 7
3, 74, switches 75 having terminals 75a and 75b, movable contact 75c, 1/3 frequency dividers 76 and 77, memory 7
8, line memories 79 and 80, line memory control circuit 8
It consists of 1. The same components as those described above are designated by the same reference numerals, and the description thereof will be omitted.

The recording amplifier 14 (not shown) is connected to the rotary head 31 (not shown).

First, the TCI signal obtained by line-sequencing the color signals Pr and Pb also requires a horizontal synchronizing signal and horizontal and vertical blanking periods, so the sum 102 of 768 and 256 is obtained.
The second clock generator 8 generates a new clock CLK10 (for example, 1088 times) in which the horizontal synchronization frequency is a multiple of 4 or more.

[Embodiment 1] Similarly, the clock CLK2 having the same frequency as the horizontal synchronizing frequency of the NTSC signal generated by the first clock generator 3 is supplied to the second clock generator 8 to generate the CLK10. .

Two color difference signals Pr of the high-definition signal,
Pb is input to the input terminals 71 and 72. Input terminal 7
The two color signals Pr and Pb input to 1 and 72 are A /
After being digitized by the D converters 73 and 74, the movable contact 75c of the switch 78 is connected to the terminal 75 by the switching control signal from the writing control circuit 7 every horizontal scanning period.
It is selectively output here by being switched to a or 75b and line-sequentially multiplexed to form one color signal data.

Then, the line-sequentially multiplexed color signal data is written in the memory 78. Here, the memory 78
The write control signal from the write control circuit 7 and 1
The write clock from the / 3 frequency divider 76 is supplied.

Thus, the line-sequentially multiplexed color signal data read from the memory 78 is similar to the luminance signal.
The time axis is converted into a 2 × NTSC signal. At the time of this read, the read control signal from the read control circuit 10 and the read clock from the 1/3 frequency divider 77 are supplied to the memory 78.

The clock supplied to the memory 78 for storing the line-sequentially multiplexed color signal data is 1/3 of the clock supplied to the memory 6 for storing the luminance signal data.
Have a frequency of.

The luminance signal of the high-definition signal input to the input terminal 1 is digitized by the A / D converter 5 and then written in the memory 6 by the write control circuit 7. Then, it is read from the memory 6 by the read control circuit 10. Similarly, the read luminance signal data is time-axis converted into a 2 × NTSC signal.

2 × NT output from memories 6 and 78, respectively
The luminance signal and chrominance signal data, which have been time-axis converted into SC signals, are input to the line memories 79 and 80, respectively.

As shown in the timing chart of FIG.
Then, the line memory control circuit 81 reads the signals in which the luminance signals and the chrominance signal data, which have been time-axis converted into the 2 × NTSC signals, from the line memories 79 and 80, respectively, are read out at different times to read the image of the TCI signal The part is encoded.

The video portion of the encoded TCI signal is added with horizontal and vertical synchronizing signals and other timing signals by the signal processing circuit 11, and the encoding is completed.

The configuration after the signal processing circuit 11 is the same as that of the first embodiment, so its explanation is omitted.

Here, "CLK1" shown in FIG. 8A is the clock cc output from the first clock generator 3,
"Y" shown in FIG. 7B is a signal waveform dd of the luminance signal data output from the line memory 79, and "line sequential C" shown in FIG. 7C is line sequential multiplexed output from the line memory 80. The signal waveform ee of the color signal data, “LMWR1, 2” shown in FIG. 7D is the data write control signal ff output from the line memory control circuit 81 to the line memories 79, 80, and the data write control signal ff is “ When it becomes "1", the addresses of the line memories 79 and 80 are reset, and the data is written from the address "0".

"LMWE1,2" shown in FIG. 13E is a data enable signal gg output from the line memory control circuit 81 to the line memories 79, 80.
When g is "1", the state where each data is written in the line memories 79 and 80 is maintained.

Next, the case where the input signal to be recorded is the NTSC signal will be described. First, the color signal decoding circuit (not shown) decodes the subcarrier color signal into two color difference signals (BY) and (RY), and the input terminal 7
1, 72 are input.

The two color difference signals input to the input terminals 71 and 72 are digitized by the A / D converters 73 and 74, and then are switched by the switching control signal from the write control circuit 7 every horizontal scanning period. , The movable contact 75 of the switch 78
c is selectively output here by being switched to the terminals 75a and 75b, and line-sequentially multiplexed into one color signal data.

The line-sequentially multiplexed color signal data is written in the memory 78. Here, the memory 78
The write control signal from the write control circuit 7 and 1
The write clock from the / 3 frequency divider 76 is supplied.

In this way, the line-sequentially multiplexed color signal data read out from the memory 78 is 2 in the same manner as the luminance signal.
× Time-axis converted to NTSC signal. When reading this
The memory 78 is supplied with the read control signal from the read control circuit 10 and the read clock from the 1/3 frequency divider 77.

The clock supplied to the memory 78 which stores the line-sequentially multiplexed color signal data is 1/3 of the clock supplied to the memory 6 which stores the luminance signal data.
Have a frequency of.

On the other hand, the luminance signal of the NTSC signal inputted to the input terminal 1 is separated from the horizontal synchronizing signal by the synchronizing signal separating circuit 2 in the same manner as when the luminance signal of the high definition signal is supplied. The horizontal synchronizing signal is supplied to the clock generator 3 and the clock generators 8 and 75 via the switch 4, respectively. At this time, the movable contact of the switch 4 is switched to the terminal 4b side.

The second clock generation circuit 8 is 2 × NTSC.
A clock for generating a signal is generated, and the third clock generation circuit 75 generates a clock which is (for example) 1088 times the horizontal synchronizing signal frequency of the 2 × NTSC signal.

Here, "LMRR1" shown in FIG.
Is a data read control signal hh output from the line memory control circuit 81 to the line memory 80, and this control signal hh
Becomes "1", the data is sequentially read from the address "0" of the line memory 80.

"LMRR2" shown in FIG. 28G is a data read control signal ii output from the line memory control circuit 81 to the line memory 79, and this control signal ii is "1".
At this time, data is read from the line memory 79,
When it is "0", no data is read.

"LMRE1" shown in FIG. 13H is a data enable signal jj output from the line memory control circuit 81 to the line memory 80. When the signal jj is "1", data is read from the line memory 80. To maintain.

"LMRE2" shown in FIG. 9I is a data enable signal kk output from the line memory control circuit 81 to the line memory 79. When the signal kk is "1", data is read from the line memory 79. To maintain.

In FIG. 13 (J), “CLK10” is the clock 11 output from the second clock generator 8, and FIG.
The “TCI image part” shown in FIG. 2 is a signal waveform mm in a state where the TCI signal supplied to the signal processing circuit 11 is analogized.

The structure and operation of the reproducing system of the video signal recording / reproducing apparatus C are complementary to the structure and operation of the recording system C1 described above, and therefore description thereof is omitted here.

[0238]

As described above, in the video signal recording apparatus according to the present invention, a high-definition video signal having a larger amount of information than that of the conventional broadcasting system video signal is converted into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal. In the video signal recording device for recording as the converted video signal obtained by the above, since the sampling frequency of the high-definition video signal is a common multiple of each horizontal synchronization signal frequency of the high-definition video signal and the conventional broadcasting system video signal, The high-definition video signal can be recorded without deterioration in image quality so as to be compatible with the conventional broadcasting system video signal without using an expensive high-definition video signal recording device.

The video signal reproducing apparatus according to the present invention is
The high-definition video signal is reproduced by inversely converting the converted video signal obtained by converting the high-definition video signal, which has a larger amount of information than the conventional broadcasting system video signal, into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal. In the video signal reproducing device, the sampling frequency of the converted video signal is set to a common multiple of each horizontal synchronizing signal frequency of the high-definition video signal and the conventional broadcasting system video signal. It is possible to reproduce a high-definition video signal with high fidelity so as to be compatible with a conventional broadcasting system video signal without using a signal reproduction device.

Further, the video signal recording / reproducing apparatus according to the present invention is a conversion obtained by converting a high-definition video signal having a larger amount of information than the conventional broadcasting system video signal into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal. A video signal recording / reproducing device which records a video signal and reproduces a high-definition video signal by inversely converting the recorded converted video signal, wherein each sampling frequency of the high-definition video signal and the converted video signal is Since it is a common multiple of each horizontal synchronizing signal frequency of the high definition video signal and the conventional broadcasting system video signal, this high definition video signal is compatible with the conventional broadcasting system video signal without using an expensive high definition video signal recording / reproducing device. Therefore, it is possible to record high-definition video without deterioration of image quality so that high-definition video can be reproduced with high fidelity.

The video signal recording apparatus according to the present invention is a continuous conversion video signal obtained by converting at least two systems of the conventional broadcasting system video signal into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal. In a video signal recording device for recording, since the sampling frequency used for conversion is an integral multiple of the horizontal synchronizing signal frequency of the conventional broadcasting system video signal, for example, two different videos are simultaneously recorded on the same recording medium. Therefore, it is possible to have a recording function for two conventional video signal recording devices capable of recording only one video.

The video signal reproducing apparatus according to the present invention is
At least 2 by converting the converted video signal of 1 obtained by converting the conventional broadcast system video signal of at least two systems into an integral multiple of the number of scanning lines of this conventional broadcast system video signal,
In a video signal reproducing device for reproducing a conventional broadcasting system video signal, the sampling frequency used for the inverse conversion is a common multiple of the horizontal synchronizing signal frequency of the conventional broadcasting system video signal, so that, for example, the same recording medium is used. Since two different images recorded at the same time can be played back simultaneously,
2 of the conventional video signal reproducing apparatus capable of reproducing only 1 image
It is possible to have a reproduction function for a vehicle.

Further, the video signal recording / reproducing apparatus according to the present invention is one converted video signal obtained by converting at least two systems of the conventional broadcasting system video signal into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal. Recorded as and also recorded 1
At least 2 by inversely converting the converted video signal of
In a video signal recording / reproducing device for reproducing a conventional broadcasting system video signal, each sampling frequency used for conversion and inverse conversion is set to a common multiple of the horizontal synchronization signal frequency of the conventional broadcasting system video signal. Two different images can be simultaneously recorded on the same recording medium, and two different images can be simultaneously reproduced by reproducing the simultaneously recorded recording mediums, so that only one image can be recorded and reproduced. It is possible to have a reproducing function for two conventional video signal recording / reproducing devices.

Furthermore, the video signal recording / reproducing apparatus according to the present invention is obtained by converting a high-definition video signal having a larger amount of information than the conventional broadcasting system video signal into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal. A video signal recording / reproducing apparatus for reproducing a high-definition video signal by recording as a converted video signal and by inversely converting the recorded converted video signal, wherein each field of a conventional broadcasting system video signal and a high-definition video signal When the frequencies are different, the sampling frequencies used for the conversion and the inverse conversion are the horizontal synchronization signal frequencies of the conventional broadcast video signal obtained by assuming that the field frequencies of the conventional broadcast video signal and the high definition video signal are the same. Since it is a common multiple of the horizontal sync signal frequency of the high definition video signal,
Whether the field frequencies of the conventional broadcasting system video signal and the high-definition video signal are the same or different, regardless of the difference between the field frequencies of the conventional broadcasting system video signal and the high-definition video signal, for example, Two different images can be simultaneously recorded on the same recording medium, and two different images can be simultaneously reproduced by reproducing the simultaneously recorded recording mediums, so that only one image can be recorded and reproduced. It is possible to provide a video signal recording / reproducing device which is extremely easy to handle, which makes it possible to obtain a reproducing function for two conventional video signal recording / reproducing devices.

[Brief description of drawings]

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

FIG. 2 is a block configuration diagram of a frame synchronization circuit 15 shown in FIG.

FIG. 3 is a block configuration diagram of a first embodiment of a video signal recording device according to the present invention.

FIG. 4 is a block diagram of an embodiment of a video signal reproducing apparatus according to the present invention.

FIG. 5 is a timing chart of H rate.

FIG. 6 is a V rate timing chart.

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

FIG. 8 is a TCI encoding timing chart.

[Explanation of symbols]

 A, B Video signal recording / reproducing apparatus A1, B1, C1 recording system A2, B2, C2 reproducing system

Claims (7)

[Claims] 1. A video signal recording apparatus for recording a high-definition video signal, which has a larger amount of information than that of a conventional broadcasting system video signal, as a converted video signal obtained by converting it into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal. A video signal recording device characterized in that the sampling frequency of the high-definition video signal is a common multiple of each horizontal synchronizing signal frequency of the high-definition video signal and the conventional broadcasting system video signal. 2. A high-definition video signal obtained by converting a high-definition video signal, which has a larger amount of information than that of a conventional broadcasting system video signal, into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal, and by inversely converting the converted video signal. A video signal reproducing device for reproducing a video signal, wherein the sampling frequency of the converted video signal is a common multiple of each horizontal synchronizing signal frequency of the high definition video signal and the conventional broadcasting system video signal. . 3. A high-definition video signal, which has a larger amount of information than that of a conventional broadcasting system video signal, is recorded as a converted video signal obtained by converting it into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal, and is recorded. A video signal recording / reproducing device for reproducing a high-definition video signal by inversely converting the converted video signal, wherein each sampling frequency of the high-definition video signal and the converted video signal is set to that of the high-definition video signal and the conventional broadcasting system video signal. A video signal recording / reproducing apparatus characterized in that it is a common multiple of each horizontal synchronizing signal frequency. 4. A video signal recording apparatus for recording at least two systems of conventional broadcasting system video signals as one continuously converted video signal obtained by converting the number of scanning lines of this conventional broadcasting system video signal into an integral multiple. The video signal recording device is characterized in that the sampling frequency used for the conversion is an integral multiple of the horizontal synchronizing signal frequency of the conventional broadcasting system video signal. 5. A converted video signal obtained by converting at least two systems of conventional broadcasting system video signals into an integral multiple of the number of scanning lines of the conventional broadcasting system video signals is inversely converted to at least two systems. A video signal reproducing device for reproducing a conventional broadcasting system video signal, wherein a sampling frequency used for inverse conversion is a common multiple of a horizontal synchronizing signal frequency of the conventional broadcasting system video signal. 6. A converted video signal obtained by converting at least two systems of the conventional broadcasting system video signal into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal, and recorded. A video signal recording / reproducing apparatus for reproducing at least two systems of conventional broadcasting system video signals by inversely converting the converted video signals, wherein each sampling frequency used for conversion and inverse conversion is
A video signal recording / reproducing device characterized in that it is a common multiple of the frequency of a horizontal synchronizing signal of a conventional broadcasting system video signal. 7. A high-definition video signal having a larger amount of information than that of a conventional broadcasting system video signal is recorded as a converted video signal obtained by converting it into an integral multiple of the number of scanning lines of the conventional broadcasting system video signal, and recorded. A video signal recording / reproducing device for reproducing a high-definition video signal by inversely converting the converted video signal, which is used for conversion and reverse conversion when the field frequencies of a conventional broadcasting system video signal and a high-definition video signal are different. The common multiple of the horizontal synchronizing signal frequency of the conventional broadcasting system video signal and the horizontal synchronizing signal frequency of the high definition video signal obtained by assuming that the field frequencies of the conventional broadcasting system video signal and the high definition video signal are the same. A video signal recording / reproducing device characterized in that