JPS60241390A - Device for recording and reproducing video signal - Google Patents

Abstract

PURPOSE:To record and reproduce signals as same as conventional one and to execute the recording and reproducing of wide-band video signals by constituting in such a way that the video signal of a standard system and that in the wide band can be selectively recorded and reproduced. CONSTITUTION:A low-frequency conversion chroma signal in a narrow band from a chrominance signal recording processing circuit 3, an FM audio signal 15 and a pilot signal 16 are supplied to an adder 13, while a frequency multiplexing signal is recorded by a main video head 18. On the other hand, Y signal high frequency components in a high-frequency band and a high frequency line sequence chrominance signal are supplied to an adder 63, which becomes a multiplexed frequency signal, and recorded by subvideo head 70. Thus the high band Y signal can be obtained from the narrow band Y signal and high-frequency component of the Y signal at reproduction, and the video signal with high resolution can be obtained from the wide band Y signal and the wide band line sequence chrominance signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a video signal recording and reproducing apparatus for recording and reproducing color television signals.

[Background of the invention]

Conventionally, in a so-called helical scan type video signal recording and reproducing apparatus in which tracks are formed diagonally on a magnetic tape, two recording and reproducing video heads are combined into one.
The azimuth angle of each video head is set at angular intervals of 80@ to record and reproduce video signals one field at a time, and to suppress the influence of crosstalk from adjacent tracks during reproduction. I try to make it different.

FIG. 1 is a block diagram showing an example of a video signal recording system of such a conventional video signal recording and reproducing apparatus, in which l is an input terminal for a color video signal, 2 is a luminance signal recording processing circuit, and 3 is a color signal recording circuit. Processing circuit, 4 is a low-pass filter, 5 is a luminance signal processing circuit, 6 is an FM modulation circuit, 7 is a high-pass filter, 8 is a bandpass filter, 9 is an ACC circuit, 10 is a color signal processing circuit, 11 is a frequency conversion circuit , 12 is a low-pass filter, 13 is an adder circuit, 14 is an audio signal input terminal, 15 is an audio signal processing circuit, 16 is a pilot signal generation circuit, 17 is a recording amplifier circuit, and 18 is a main video head for recording and playback. , 19 is a magnetic tape.

The color video signal supplied from the input terminal l is separated into a luminance signal (Y (hereinafter referred to as P!) by a low-pass filter 4 whose cut-off frequency is set to 3.2 MHz, and then sent to a Y signal processing circuit. 5. This Y signal is subjected to predetermined preprocessing by the Y signal processing circuit 5, which includes an addition circuit with a recording comb circuit, an AGC circuit, a pre-emphasis circuit, a clip circuit, etc. The modulation circuit 6 performs FM modulation, and the high-pass filter 7 removes unnecessary frequency components, resulting in an FM modulated Y signal (hereinafter referred to as FM@Y signal), which is supplied to the adder circuit 3. .

The color video signal is also supplied to the color signal recording processing circuit 3, and is centered at 3.58 MHz, approximately ±500 kHz.
By means of a bandpass filter 8 having a passband of approximately I M
Chroma signals in the Hz frequency band are separated. This chroma signal is adjusted to a predetermined amplitude by an ACC circuit 9, then preprocessed by a chrominance signal processing circuit 10 equipped with a burst emphasis circuit, a non-linear amplifier assist circuit, etc., and a frequency conversion circuit 11 performs FM @ Converted to a lower frequency band than the Y signal. Then, unnecessary components are removed by a low-pass filter 12, and the signal is supplied to an adder circuit 13 as a chroma signal in a low frequency band (hereinafter referred to as a low-pass converted chroma signal).

The audio signal supplied from the input terminal 14 is FM-modulated by the audio signal processing circuit 15 into a frequency band between the above-mentioned FM@Y@ signal and the low frequency converted chroma signal so as not to overlap with those signals. , and are supplied to the non-addition circuit 13 as FM audio signals.

In addition, the adder circuit 131C is supplied with a pilot signal for playback tracking control from the pilot signal generation circuit 16. Note that this pilot signal is a signal with a lower frequency than the low-frequency converted chroma signal.

As described above, since the signals supplied to the adder circuit 13 have different frequency bands, they become frequency multiplexed signals that do not overlap each other even when added.
The signal is recorded on the magnetic tape 19 by the main video head 18 via the amplifier circuit 17 .

Next, an example of a video signal reproducing system of the video signal recording and reproducing apparatus will be explained with reference to FIG. In the figure, 21 is a preamplifier circuit, 22 is a high-pass filter, 23 is an FM and Y signal processing circuit, 24 is a demodulation circuit, 25 is a Y signal processing circuit, 26 is a low-pass filter, 27 is a low-pass filter, 28 is an ACC circuit, 29 is a frequency conversion circuit, 30 is a bandpass filter, 31 is a color signal processing circuit, 32 is a bandpass filter, 33 is an audio signal reproduction processing circuit, 34 is a low pass filter, 35 is a Y signal reproduction processing circuit, 36 is a color signal reproduction processing circuit, 37 is an addition circuit, 38 is an output terminal for the reproduced color video signal,
39 is an output terminal for a reproduced audio signal, 40 is an output terminal for a pilot signal, and 18 and 19 are a main video head and a magnetic tape corresponding to FIG. 1, respectively.

The reproduced signal reproduced from the magnetic tape 19 by the main video head 18 and amplified to a predetermined amplitude by the preamplifier circuit 21 is transmitted to the Y signal reproduction processing circuit 35 and the color signal reproduction processing circuit 3.
6. A bandpass filter 32 and a lowpass filter 34 are provided.

First, from the reproduced signal supplied to the Y signal reproduction processing circuit 35, the FM@Y signal in the highest frequency band is separated by the high-pass filter 22.

This FM-Y signal is subjected to predetermined preprocessing by a dropout compensation circuit, a limiter circuit, etc. provided in the FM-Y signal processing circuit 23, and demodulated and modulated into a Y signal in the color video signal band by the demodulation circuit 24. be done. The demodulated Y signal passes through a Y signal processing circuit 25 equipped with a de-emphasis circuit, etc., removes unnecessary frequency components by a low-pass filter 26, and then is supplied to an adder circuit 37.

Next, a low-pass converted chroma signal is separated from the reproduced signal supplied to the color signal reproduction processing circuit 36 by a low-pass filter 27 and supplied to an ACC @ path 28 .

In the ACC circuit 28, variations in the level of the low-frequency converted chroma signal caused by differences in the characteristics of the main video signal generator (2018) are adjusted, and the low-frequency converted chroma signal at a constant level is supplied to the frequency conversion circuit 29, which converts the color video signal. It is converted into a frequency band chroma signal. This chroma signal is subjected to predetermined post-processing by a chrominance signal processing circuit 31 having unnecessary frequency components removed by a bandpass filter 30 and a chrominance signal processing circuit 31 equipped with a square filter, a non-linear de-emphasis circuit, a burst de-emphasis circuit, etc. to remove crosstalk. After being applied, it is supplied to an adder circuit 37.

As described above, the reproduced Y signal and chroma signal are combined by the adder circuit 371C to become a color video signal,
It is output to the output terminal 38.

The FM audio signal is separated from the playback signal supplied to the bandpass filter 32, subjected to processing such as FM demodulation by the audio signal playback processing circuit 33, and the audio signal is output to the output terminal 39.

A pilot signal is separated from the reproduced signal supplied to the low-pass filter 34 and output to the output terminal 4o. Note that this pilot signal is supplied to a servo circuit such as a capstan motor (not shown), and is supplied to the main video head 18.
tracking control is performed.

FIG. 3 shows the frequency spectrum of the frequency multiplexed signal recorded on the magnetic tape 9 by the video signal recording circuit shown in FIG. In the figure, p is a pilot signal, C is a low frequency converted p-ma signal, f is an FM audio signal, and f is a frequency spectrum of a PM-Y signal.

The frequency band of the Y signal is approximately 0 = 3L 2 MHz
, the frequency band of the chroma signal is f. ±500kH
z (where f and . are color subcarrier frequencies), and the FM-Y signal fA has a division of 12
MHz, and from 4.2 MHz to 5.4 MHz
The low frequency converted chroma signal C is set to a frequency band of approximately 7
The frequency band of ±500 kHz is set around 40 kHz, and the PM audio signal f is FM,
A frequency band is set with a center frequency of 15 MHz so that the lower sideband of Y@fA does not overlap with the low-frequency converted chroma signal C, and the pilot signal p is lower than the low-frequency converted chroma signal C. set to the frequency band.

By the way, in order to obtain a frequency multiplexed signal having the above frequency spectrum, the frequency bands of the Y signal and the chroma signal are limited by the Y signal recording processing circuit 2 and the color signal recording processing circuit 3 shown in FIG. Ru.

That is, as mentioned above, by the low-pass filter 4,
The frequency band of the Y signal is limited to approximately 3.2 MHz,
One chroma signal is passed through a bandpass filter 8 to approximately IM
Limited to Hz frequency band.

As a result, the color video signal reproduced by the video signal reproducing circuit shown in FIG. 2 has less information than the color video signal before recording, leading to a decrease in the resolution and quality of the reproduced image. .

For example, in order to obtain a reproduced image with a resolution of 350 lines and a corresponding color resolution, the Y signal in the frequency band of 0 to 4.5 MHz and f. A chroma signal with a frequency band of ±I MHz is required.

However, as the upper limit of the frequency band of the frequency multiplexed signal is determined, it is necessary to allocate the frequency band of each signal, and as shown in Figure 3, FM-Y
If the carrier frequency of the signal is 5 MHz, the frequency interval between the center frequency and the FM audio signal of 1.5 MHz will be less than 3.5 MHz, and in the end,
It is necessary to limit the frequency band of the Y signal to about 3.2 MHz.

In addition, in order to prevent the frequency band of the low-frequency converted chroma signal from overlapping the frequency bands of the chroma signal and the FM audio signal, the low-frequency converted chroma signal must be converted to 749
There is no choice but to limit the frequency band to ±500 kHz centered around kHz.

Note that in order to prevent the deterioration of the transient response of the chroma signal, the bandpass filter 8 and the lowpass filter 12 shown in FIG. 1 and the bandpass filter 30 and the lowpass filter 27 shown in FIG.
It is not possible to make the shoulder characteristic steep, and the center frequency ±50
The level of 0 kHz is attenuated by about -6 dB.

Due to the frequency band limitations described above, it is difficult to improve the image quality of reproduced images.

Furthermore, coupled with the spread of such video signal recording and reproducing devices,
Video cameras are also becoming more popular, but the frequency band of the video signal obtained by a video camera is sufficiently wide, and the reproduced image obtained by supplying this signal to a television receiver has a very high resolution. Once a video signal is recorded and reproduced in a video signal recording and reproducing device, the resolution deteriorates due to the frequency band limitation described above, and the characteristics of the video camera cannot be fully utilized. In other words, the color video signal obtained from the video camera has a Y signal of 0 to 4.5 MHz, a color signal of an engineering signal of 0 to 15 MHz, and a Q@ signal of 0 to 0.5 MHz.
Generally, the frequency band of the reproduced color video signal is narrow, and only reproduced images with low resolution can be obtained.

[Object of the Invention] The object of the present invention is to provide a video signal recording and reproducing device that eliminates the drawbacks of the above-mentioned conventional techniques and is capable of recording and reproducing in the same way as the conventional technology, as well as recording and reproducing broadband video signals. is to provide.

[Summary of the invention]

To achieve this objective, the present invention, similar to the prior art, converts a wideband Y signal into a band-limited narrowband Y signal by FM
The wideband Kukima signal converts the band-limited narrowband chroma signal into a low-band chroma signal, and frequency-multiplexes these signals to form a first recording signal. The broadband line sequential color signal is frequency-multiplexed and recorded as a second recording signal, and during reproduction, the narrowband Y
The present invention is characterized in that a wideband Y signal is obtained from the signal and the high-frequency component of the nuclear Y signal, and a high-resolution video signal can be obtained from the wideband Y signal and the broadband line-sequential color signal.

When recording and reproducing a video signal consisting of a narrowband Y signal and a narrowband chroma signal as in the prior art, only the first recording signal is recorded and reproduced.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.No. 4 @ is a block diagram showing an embodiment of the video signal recording system of the video signal recording and reproducing apparatus according to the present invention, 51 is a switch circuit, 52 is a Y signal Input terminal, 53 is R-Y signal input terminal, 54 is modulation circuit 55 is switch circuit, 56 is B-Y
Signal input terminal 57 is a modulation circuit, 58 is a 90'' phase shift circuit, 59 is a subcarrier oscillation circuit, 60 is a bandpass filter, 6
1 is an equalizer, 62.63 is an addition circuit, 64 is a high-speed switching circuit, 65 is a wideband color difference signal processing circuit, 6
6 is a bandpass filter, 67 is a horizontal synchronizing pulse input terminal, 6
8 is a clip-flop circuit, 69 is a recording amplifier circuit, 7
0 is a sub video head, and parts corresponding to those in FIG. 1 are given the same reference numerals. In this embodiment, when a video camera is connected, the Y signal from the video camera is used.

The R-Y signal and the B-Yi signal are input to the input terminals 52 and 53, respectively.
．． As mentioned above, the frequency band of each signal from the video camera is 0 to 45 MHz for the Y signal.

It is assumed that both the RY signal and the BY signal are approximately 0 to 1 MHz.

First, if you do not record with a video camera,
Switch circuits 51 and 55 are both closed to the color video signal input terminal 1 side. Therefore, the color video signal from the input terminal l is supplied to the Y signal recording processing circuit 2 and the color signal recording processing circuit 3, and as explained in FIG. A narrowband FM-Y signal and a low frequency converted chroma signal are supplied, and furthermore, a PM audio signal is supplied from the audio signal processing circuit 15, a pilot signal is supplied from the pilot signal generation circuit 16, and the frequency spectrum shown in FIG. A frequency multiplexed signal having .

Next, when recording a video signal from a video camera, the switch circuit 51 is closed to the Y signal input terminal 52 side, and the switch circuit 55 is closed to the addition circuit 62 side.

The wideband Y signal from the Y signal input terminal 52 is supplied to the Y signal recording processing circuit 2, and as described above, the narrowband FM-
A Y signal is formed and supplied to the adder circuit 13.

Further, the B-Y signal from the input terminal 53 is supplied to a modulation circuit 54, and the B-Y signal from the input terminal 56 is supplied to a modulation circuit 57. The modulation circuit 54 is supplied with a color subcarrier from a subcarrier oscillation circuit 59, and the modulation circuit 57 is supplied with a color subcarrier phase-shifted by 90° by a 90° phase shift circuit 58. Therefore, the color subcarriers having a phase difference of 90'' from each other are modulated by the R-Y signal and the B-Y signal and supplied to the adder circuit 62, so that the adder circuit 62 outputs a balanced modulated chroma signal. , and is supplied to the color signal recording processing circuit 3 through the switch circuit 55.Then, the narrowband low-frequency converted chroma signal is supplied from the color signal recording processing circuit 3 to the addition circuit 13.

Furthermore, the adder circuit 13 includes an audio signal processing circuit 1
Since the FM audio signal from the main video head 18 and the pilot signal from the pilot signal generation circuit 16 are respectively supplied, a frequency multiplexed signal having the frequency spectrum shown in FIG. 3 is recorded by the main video head 18.

On the other hand, the passband of the Y signal from terminal 52 is 3M.
It is also supplied to a bandpass filter 60 of Hz to 4.5 MHz, where a high frequency Y signal (hereinafter referred to as high frequency Y signal) is separated and supplied to an adder circuit 63 via an equalizer circuit 61.

Additionally, the RY and B-Y signals are provided to predetermined input terminals of the high speed switching circuit 64.

Here, the flip-flop circuit 681C is supplied with a horizontal synchronizing pulse via the input terminal 67, and forms a rectangular wave signal that is inverted every IH (1 water period). This rectangular wave signal is supplied to a high-speed switching circuit 64 and a wideband color difference signal processing circuit 65.

Therefore, the high-speed switching circuit 64 switches every IH according to the rectangular wave signal, and a line-sequential color difference signal in which the R-Y signal and the B-Y signal are alternately arranged is formed. This line-sequential color difference signal is subjected to processing such as FM modulation by a color difference signal processing circuit 65, unnecessary frequency components are removed by a bandpass filter 66, and then an addition circuit 65
3. Note that the carrier frequency of this FM modulation is set so that the frequency band of the line-sequential color difference signal is higher than the frequency band of the high-frequency Y signal.

Furthermore, in the color difference signal processing circuit 65, in synchronization with the rectangular wave signal from the flip-flop circuit 68, for each line,
The carrier frequencies of the RY signal and the BY signal are given an offset so that line discrimination can be easily performed during signal reproduction, which will be described later.

Furthermore, if a synchronization signal synchronized with the Y@ signal is added to the line-sequential color difference signal and then FM modulated by the color difference signal processing circuit 65, it can be used for phase alignment of the Y signal and the color difference signal during playback, as will be described later. can.

The high-frequency Y signal and the FM-modulated line-sequential color difference signal (hereinafter referred to as FM line-sequential color difference signal) are added to the adder circuit 6.
3 and becomes a frequency-multiplexed signal (hereinafter referred to as a frequency-multiplexed sub-signal), which is amplified by an amplifier circuit 69 and then recorded on the magnetic tape 19 by a sub-video head 70 .

FIG. 5 shows the frequency spectrum of the frequency multiplexed sub-signal recorded by the sub-video head 70. In the same figure, the high frequency Y signal H is not modulated, so it is 3M
Occupying the frequency band from Hz to 4.5 MHz, FM@
Jl[Next color difference signal F1 is divided into I M
Hz, and has a frequency band of approximately 4.5 MHz to 7.5 MHz, including sidebands, assuming a carrier center frequency of 6 MHz. Therefore, the difference frequency between the high-frequency Y signal and the FM # sequential color difference signal is 1.5 MHz to 3 MHz, so each beat component is outside the frequency band of the high-frequency Y signal and the FM line sequential color difference signal. Become.

FIG. 6 (83, (b) is a plan view and a side view of a rotating cylinder showing the arrangement relationship between the main video head and the sub video head, and 81 is the rotating cylinder 18a.

18b is a main video head, and 70a and 70b are sub-video heads.

In the figure, main video heads 18a and 18b.

The sub-video heads 70a and 70b are provided on a rotary cylinder 81 at an angular interval of 180', respectively, and the main video heads 18a, 18b and the sub-video head.

A predetermined step force 1 is provided between 70a and 70b. In the figure, the sub video heads 70a, 70b are provided at a higher zero position than the main video heads Iga, 18b.

FIG. 7 is an explanatory diagram showing tracks formed by the main video heads 18a, 18b and the i9J video heads 70a, 70b, 82a to 82gt! Tracks formed by main video heads i8a and isb, 833~
83g is a track formed by the sub video heads 70a and 70b.

As shown in FIG. 6(b), the main video head 181.
By providing a step between the main video heads 18b and the sub video heads 70g, 70b, the main video heads 18a, 18b
track and sub-video head 70a.

Tracks 70b are formed alternately.

Here, each video head is made to have a different azimuth angle. For example, the azimuth angle of the main video head 18a is set to +10', the main video head 18b is set to -10°, the azimuth angle of the sub video head 70m is set to +30°, and the azimuth angle of the sub video head 70b is set to -30''.

As a result, the difference in azimuth angle between video heads forming adjacent tracks is at least 206 degrees, and a sufficient azimuth effect can be obtained at Takatsuka, making it possible to sufficiently suppress crosstalk of high-frequency components from adjacent trunks. .

Therefore, as shown in FIG. 5, the signals recorded and reproduced by the sub video heads 70a and 70b do not have low frequency signal components, so the signals reproduced by the main video heads 18a and 18b are crossed. Also not included is a sub-video head 70a.

Although the reproduced signal by 70b includes crosstalk,
Since this crosstalk is in a low frequency band that is different from the frequency band of the high-frequency Y signal and the PM line sequential color difference signal, it can be easily removed with a filter, and in the end, no problem will arise regarding crosstalk. .

Note that the azimuth angles of the sub-hand doors 0a and 70b are both 0°.
Even so, the azimuth effect is slightly inferior to the above case of ±300, but as shown in Figure 5, the high frequency Y signal and the FM line sequential color difference signal are in the high frequency band, so the azimuth effect decreases. is small and poses no practical problem.

Next, an embodiment of the reproduction system of the video signal recording and reproduction apparatus according to the present invention will be described with reference to FIG.

The same figure is a block diagram showing a regeneration circuit, and 101 is a preamplifier circuit, 102 is an addition circuit, 103 is a bandpass filter, 104 is a delay circuit, 105 is a regeneration processing circuit, 106 is a switch circuit, and 107 is a control signal. Input terminal, 10g is a bandpass filter, 109 is a processing circuit, 110 is a delay circuit, I
'll is a horizontal scanning period delay circuit (hereinafter referred to as IH delay circuit), 112.117 is a high-speed switching circuit, 11
3. 118 is a limiter circuit, 114 and 119 are demodulation circuits, 115 and 120 are processing circuits, 116 and 121 are low-pass filters, 122 is a Y signal output terminal, 123 is an R-Y signal output terminal, and 124 is a B-Y This is a signal output terminal, and parts corresponding to those in FIG. 2 are given the same reference numerals.

The reproduction signal reproduced from the magnetic tape 19 by the main video head 18 and amplified to a predetermined amplitude by the preamplifier circuit 21 is sent to the Y signal reproduction processing circuit 35 and the color signal reproduction processing circuit 3.
6, is supplied to a bandpass filter 32 and a low-pass filter 34. As explained in FIG. 2, the narrowband Y signal is reproduced from the Y signal reproduction processing circuit 35 and supplied to the addition circuit 102, and then the chroma signal reproduced by the color signal reproduction processing circuit 36 and the addition circuit 37 is added.

Therefore, a color video signal can be obtained at the output terminal 38. An audio signal and a pilot signal are output to the output terminals 39 and 40, respectively.

On the other hand, the reproduced signal reproduced by the sub video head 70 and amplified by the preamplifier circuit 101 is passed through the bandpass filter 10.
3,108.

A high-frequency Y signal is separated from the reproduction signal by a bandpass filter 103, and this high-frequency Y signal is delayed by a predetermined time by a delay circuit 104, and then a level adjustment circuit, a dropout compensation circuit, a reproduction equalizer circuit, etc. are provided. The signal is processed by a reproduction processing circuit 105 and supplied to an addition circuit 102 via a switch circuit 106.

Then, in the adder circuit 102, a broadband Y signal that is almost the same as the Y signal supplied from the video camera during recording is synthesized, and is supplied to the output terminal 122 and the adder circuit 37. In the adder circuit 37, the broadband Y signal and the chroma signal from the color signal reproduction processing circuit 36 are combined, and the resulting color video signal is outputted to the output terminal 38.

Next, the FM line sequential color difference signal is separated from the reproduced signal supplied to the bandpass filter 108. This FMfi body color difference signal is processed by a processing circuit 109 including a dropout compensation circuit, etc., and is delayed by a delay circuit 110 for a predetermined time, and then is connected to one contact of each of an IH delay circuit 111 and a high-speed switching circuit 112 and 117. supplied to In the delay circuit 110, when an image is reproduced,
Phase adjustment is performed to prevent a phase difference between the Y[ signal and the color difference signal, and an optimal delay time is set together with the delay circuit 104.

The FM line sequential color difference signal supplied to the IH delay circuit 1jl is IH-delayed and then transferred to the high-speed switching circuit 112,1.
17, respectively, to the other contacts.

Therefore, the high-speed switching circuits 112 and 117 have
The FM-modulated RY signal and BY signal included in the next color difference signal are alternately supplied every one horizontal scanning period.

The high-speed switching circuits 112 and 117
Since the switching operation is performed every time, the limiter circuit 11
3 is continuously supplied with an FM modulated R-Y signal,
The limiter circuit 117 is continuously supplied with an FM modulated BY signal.

By the way, the IH of the high-speed switching circuits 112 and 117
Each switching operation is performed by providing an offset to the carrier frequency in the color difference signal processing circuit 65 described in FIG. R-Y
The signal and the B-Y signal are discriminated, and the process is carried out based on the result of this discrimination.

The FM-modulated R-Y signal thus obtained passes through a limiter 113 and is demodulated into a R-Y signal by a demodulation circuit 114, and a processing circuit 115 including a de-emphasis circuit suppresses triangular noise generated during demodulation. After unnecessary frequency components are removed by the low-pass filter 116, the signal is output to the output terminal 123.

On the other hand, the FM modulated B-Y signal is transmitted to the limiter 11.
8, it is demodulated into a B-Y signal by a demodulation circuit 119,
A processing circuit 120 including a de-emphasis circuit performs processing such as suppression of triangular noise, and a low-pass filter 121
After unnecessary frequency components are removed, the signal is output to the output terminal 124.

As explained above, the reproduced Y signal, R-Y signal, and B-Y signal have almost the same frequency band as that supplied from the video camera during recording, and therefore have high resolution and high quality. images can be played back.

The switching circuit 106 is opened and closed using the control signal input terminal 107.
This is done by a control signal supplied to the device, which control signal can be applied manually or automatically. When a wideband video signal from a magnetic tape 19Vc video camera is recorded, the switch circuit 106 is closed as explained above, but the normal video signal from the Kugata terminal l in FIG. For example, if an NTSC video signal is being recorded, the switch circuit 106 is opened so that a normal video signal can be obtained at the output terminal 38. Of course, when a wideband video signal from a video camera is recorded on the magnetic tape, when the switch circuit 106 is closed, a video signal in which a chroma signal is multiplexed on a wideband Y signal is obtained at the output terminal 38. It will be done. Conversely, when the switch circuit 106 is open, a normal narrowband video signal is obtained at the output terminal 38.

Further, the delay circuits 104 and 110 are for time-aligning the high frequency Y signal and the low frequency converted chroma signal with the narrow band Y signal from the Y signal reproduction processing circuit 35. Since the azimuth angle of the video head 18°70 differs between adjacent trunks, if a tracking deviation occurs, the video head 1
A time lag occurs between the reproduced signals of 8.70. This time adjustment is performed by the delay circuits 104 and 110, and for this purpose, the delay time of the delay circuits 104 and 110 may be made variable. The control signals that control these delay times are
For example, as explained above with reference to FIG. 4, the color difference signal processing circuit 65 adds an FM modulation amount synchronization signal to the line-sequential color difference signal, and this synchronization signal and the Y signal reproduction processing circuit 35 separate it from the narrowband Y signal. It is obtained by detecting the time difference with the horizontal synchronization signal obtained by

Of course, since the high-band Y signal includes a high-amplitude pulse generated from the end of the horizontal synchronization signal, the time difference between this pulse and the horizontal synchronization signal of the narrow-band Y signal causes the control signal of the delay circuits 104 and 110 to be Various other methods for forming the control signal are also conceivable, such as forming the control signal. However, since the circuit configurations of the Y signal processing system and the wideband chroma signal processing system are different, the amount of delay between the Y signal and the wideband chroma signal is also different. By controlling the delay circuit 110 according to the time difference between the narrow band YfjI signal and the chroma signal, the output terminals 122, 12
3,124, wideband Y signals, RY signals, and BY signals which are precisely time-aligned with each other are obtained.

Note that in order to be able to adjust the time in this way, it is better to slightly delay the signal recorded by the main video head 18.

Furthermore, in the above embodiment, the broadband line-sequential color signal is R-
It may be formed using wideband color difference signals such as the Y signal and B-Y signal, or it may be formed using other color signals, such as an optical signal and a Q signal.

Furthermore, in the above embodiment, the signal recorded by the main video head 18 is an FM@Y signal, a low frequency conversion chroma signal,
Although the FM audio signal and the pilot signal are described above, as is already known, only one of the FM audio signal and the pilot signal may be recorded by the main video head 18, or the main video head 18 may record only one of the FM audio signal and the pilot signal. The head 18 may record only the FM/Y signal and the low frequency converted chroma signal.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to record and play back video signals of standard formats such as the NTSC format as well as the luminance signal and chrominance signal like the video signal from a video camera. It is also possible to record and reproduce wideband video signals, obtain high-resolution color reproduced images, and provide a video signal recording and reproducing device with excellent functions while eliminating the drawbacks of the conventional technology. .

[Brief explanation of the drawing]

1 and 2 are block diagrams showing an example of a conventional video signal recording and reproducing device, and FIG. 3 shows the frequency of a frequency multiplexed signal recorded and reproduced by the video signal recording and reproducing device of FIGS. 1 and 2. FIG. 4 is a block diagram showing an embodiment of the video signal recording system of the Eirin signal recording and reproducing apparatus according to the present invention, and FIG. 5 is a characteristic diagram showing the spectrum. FIG. 6(a) and 6(b) are explanatory diagrams showing an example of the arrangement of the main and sub video heads in FIG. 4 on a rotating cylinder;
The figure is an explanatory diagram showing the tracks formed by the main and sub video heads in Fig. 6+8) and (b).
FIG. 2 is a block diagram showing an embodiment of a video signal reproducing system of a video signal recording and reproducing apparatus using an AIC. 2... Y signal recording processing circuit, 3... Old color signal recording processing circuit, 13... Addition circuit, 18...
. . . Main video head, 35 . . . Y signal reproduction processing circuit, 36 . . . Color signal reproduction processing circuit, 37.
...Addition circuit, 6o...Band filter,
63... Addition circuit, 64... High speed switching circuit, 65... Color signal processing circuit, 70
... Sub video head, 102 ... Addition circuit, 103 ... Bandpass filter, 105 ...
... Regeneration processing circuit, 108 ... Bandpass filter, 111 ... lH extension circuit 112, 117.
...High-speed switching circuit, 114,119...
...Demodulation circuit. Agent Patent Attorney Kenji Take (1 person in line)Continued from page 1 ■Inventor Toshihiro Mibayashi 2g2#r, Yoshida-cho, Totsuka-ku, Yokohama Inside the Home Appliance Research Laboratory, Hitachi, Ltd.

Claims (1)

[Claims] A first processing circuit that is supplied with a standard format video signal and forms a narrowband frequency modulated luminance signal; and a second processing circuit that is supplied with the standard format video signal and forms a narrowband low-frequency conversion chroma signal. A video signal recording/reproducing device comprising a video signal recording/reproducing circuit which adds the frequency modulated luminance signal and the low-frequency converted chroma signal and records and reproduces the resultant mixture in a video head. a first means for selectively supplying a wideband chroma signal to the first processing circuit; and a first means for forming a wideband chroma signal accompanying the wideband luminance signal and selecting the wideband chroma signal and the standard video signal to the second processing circuit. a third means for separating high frequency components of the broadband luminance signal; a fourth means for forming and frequency modulating a broadband line-sequential chrominance signal associated with the broadband luminance signal; A fifth means for adding the output signals of the third means and the fourth means, and a video head for recording and reproducing the output signal of the fifth means are provided, and the video head is configured to record and play back the output signal of the standard format video signal and the broadband video signal. 1. A video signal recording and reproducing device characterized in that it is configured to be able to selectively record and reproduce signals.