JPH03262295A - Video signal recorder and video signal reproducing device - Google Patents

Abstract

PURPOSE:To eliminate a cause to occurrence of crosstalk and dot disturbance at recording of a video signal by eliminating mixture of a color signal onto a luminance signal high frequency component or mixture of a luminance signal high frequency component onto a color signal and recording the remaining signal onto a recording medium. CONSTITUTION:A Y signal from a camera section enters a Y filter circuit 2 and a C signal enters a C filter circuit 3. The Y signal is subject to signal processing by the circuit 2 and only the Y signal component, that is, the C signal component is eliminated and the result is simultaneously given to an LPF 4 and a BPF 5. The LPF 4 passes through only a low frequency component and gives it to an FM modulation circuit 6, which applies FM modulation to the component and gives the result to an adder circuit 10. The BPF 5 inputs the Y signal and gives a signal YH subjected to band limit to an adder circuit 8. On the other hand, the C signal mixed with the Y signal component is eliminated from the Y signal component by the circuit 3, the result is subjected to band limit by a BPF 7, the signal results in a signal CB and it is added to the signal YH at the circuit 8 and the sum enters a recording color frequency conversion circuit 9, where the signal is converted into a low frequency and given to the circuit 10. The signals are added in the circuit 10 and the result is outputted and recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a video signal recording device and a video signal reproducing device, and in particular, to a video signal recording device and a video signal reproducing device. The present invention relates to a video signal recording device and a video signal reproducing device.

[Prior art] One of the basic systems for video signals is NTSC (
National Te1evisi.

There is a video composite signal system based on the (abbreviation for System Comm1ttee) standard. This NTS
One of the major features of the video composite signal based on the C standard (hereinafter referred to as the NTSC signal) is that the luminance signal that expresses brightness and the color signal that expresses color are synthesized so that they do not affect each other. be. Expressing this in terms of the frequency spectrum of the NTSC signal, the color signal is 3.58MHz.
It is inserted inside the 4.2MHz video signal band.

In fact, during the energy spectrum of the luminance signal,
By inserting the energy of the chrominance signal (called frequency interleaving), the energy of the luminance signal is
The energy of the color signal peaks at the frequency (nf+).
(2n+1)/2Xfo) is synthesized to obtain a peak. However, the fH is the horizontal scanning frequency, and n is 0, 12.3, . It is...

Now, in order to record the NTSC signal, in which the luminance signal and color signal are combined as described above, on a video tape such as a magnetic tape, it is necessary to perform further modulation processing. In this case, the NTSC signal synthesized as described above is once separated into a luminance signal and a chrominance signal, and unique modulation processing is performed on each signal.

FIG. 3 is a schematic diagram showing the functional configuration of a conventional video signal recording and reproducing device.

Note that reference numerals for each input/output signal shown in the figure will be described later.

Further, it is assumed that the NTSC signal given to this device is a signal created by another system or a signal obtained by reception.

In the figure, the video signal recording and reproducing device includes a recording section 80 and a reproducing section 90. The recording unit 80 has a signal input terminal 8 for inputting an NTSC signal, and a signal input terminal 8.
A frequency separation circuit 8 that frequency-separates the NTSC signal given from 1 and outputs a luminance signal (referred to as Y signal) and a color signal (hereinafter referred to as C signal) containing a high frequency component of the Y signal.
2. The Y signal is given from the frequency separation circuit 82,
Accordingly, FM (Frequency Module)
FM modulation circuit 6 that modulates (abbreviation for a tion), and a recording color frequency conversion circuit that similarly receives the C signal containing the high frequency component of the Y signal from the frequency separation circuit 82 and converts the low frequency accordingly. 9, an adder circuit 10 and a recording head 83. In addition, in the addition circuit 10, the input FM signal output from the FM modulation circuit 6 includes a high frequency component of the Y signal, which is low frequency converted and output from the recording color frequency conversion circuit 9, which is applied in parallel. The C signal that is transmitted is superimposed.

The signals thus superimposed by the adder circuit 10 are then recorded on the video tape as a video signal via the recording head 83.

The illustrated video signal recording section 80 is configured to input and record an NTSC signal, or if the Y signal and C signal are already separated and provided directly from the camera section, frequency separation is performed. The circuit 82 does not operate, and the Y signal from the camera unit is input to the FM modulation circuit 6, and the C signal is input to the recording color frequency conversion circuit 9.

The video signal recorded on the video tape by the recording section 80 configured as described above is transmitted to the playback section 9 described below.
0 is played back from the videotape.

In the figure, a playback unit 90 frequency-separates the playback video signal output from the videotape (playback head 91 for reading No. 4, said playback head 9), and separates it into a playback FM signal and a low-frequency color signal. an FM demodulation circuit 13 which inputs the reproduced FM signal and demodulates it to the original Y signal; and an FM demodulator circuit 13 which inputs the reproduced low-range color signal and which is opposite to the recording color frequency conversion circuit 9. a reproduction color frequency conversion circuit 14 that processes the low-range color signals and reproduces the low-range color signals; and a Y-signal AFC (Au
tomatic Frequency Control
ol) circuit 92 and C signal APC (Auto
(abbreviation for atic Phase Control) circuit 93. Further, the reproducing unit 90 includes the Y signal AFC.
A Y-type filter circuit 2 which inputs the output signal of the circuit 92 and operates to extract only the high-frequency components of the Y signal, and a C-type filter which similarly inputs the output signal of the APC circuit 93 for the C signal and operates to extract only the C signal. Circuit 3, the FM demodulation circuit 1
an adder circuit 94 that adds the Y signal of 3 outputs, the high-frequency component of the Y signal of the Y-type filter circuit 2 output, and the C signal of the C-type filter circuit 3 output, and outputs a reproduced video signal of the output of the adder circuit 94; A signal output terminal 95 is included.

Now, the Y signal AFC circuit 92 generates a signal ((45
5/2) Process to demodulate based on f, ). Further, the C signal APC circuit 93 generates a reference subcarrier wave and performs processing based on this signal to demodulate the C signal component in the obtained signal.

Now, the Y-type filter circuit 2 and the C-type filter circuit 3 will be explained in detail.

First, the Y-type filter circuit 2 is a filter that inputs a Y signal and repeats the amplitude characteristic at an integral multiple of fH in order to effectively extract only the Y signal component, and the C-type filter circuit 3 inputs a C signal and repeats the amplitude characteristic at an integral multiple of fH. fH to effectively extract only the C signal component.
This is a filter that repeats the amplitude characteristic at an odd number multiple of 1/2 of .

That is, by utilizing these filter characteristics, mixed signal components from adjacent tracks caused by crosstalk of the reproducing head 91 are eliminated. Now, the above-described filter characteristics of the Y-type filter circuit 2 and the C-type filter circuit 3 can be easily realized by a circuit using a delay line (IHH extension) that delays the signal by IH (=1/fH). That is, the Y-type filter circuit 2 includes an IHH extension line 21 and an adder circuit 22, and the adder circuit 22 adds the signal in which the Y signal high-frequency component is mixed into the C signal and the double IH delay line signal. Therefore, the C signals whose phases are inverted for each IH cancel each other out and disappear, so that only the signal (Y signal component) existing at an integral multiple of fH is extracted more effectively.

C-type filter circuit 3 includes IHH wire extension 31 and subtraction circuit 3
By subtracting the signal after the IH delay that passes through the IH delay line 3 from the signal in which the Y signal high-frequency component is mixed in the C signal, the subtraction circuit 32 subtracts only the Y signal that is in phase before and after the IH. The configuration is such that only the signal (C signal component) present at an odd multiple of 1/2 of fH is extracted more effectively. Therefore, only the Y signal component (no C signal component mixed in) can be given to each circuit after the next stage, and at the same time only the C signal component (no Y signal component mixed in) can be given.

The video signal recording section 80 and the reproducing section 90 have a circuit configuration that separates the recorded and reproduced video signal into a Y signal and a C signal and processes them independently. The operation will be explained in detail with reference to the drawings.

Figure 4 (a) to g) are schematic diagrams showing the input/output signal waveforms of each circuit shown in Figure 3 above, with the vertical axis representing amplitude and the horizontal axis representing frequency. .

First, the operation during recording will be explained.

In the recording section 80 of FIG. 3, the NTSC signal applied via the signal input terminal 801 is input to the frequency separation circuit 82. The NTSC signal is a signal (Y+C) composed of a Y signal and a C signal in a frequency interleaving relationship as shown in FIG. 4(a). The signal (
y+c) is frequency separated in the frequency separation circuit 82, and the signal Y, which is the low frequency component of the Y signal shown in FIG. 4(b), is obtained.
L is separated and applied to the FM modulation circuit 6. at the same time,
A signal (YH10) in which the Y signal high-frequency component and the C signal are mixed, shown in FIG. 4(C), is separated and applied to the recording color frequency conversion circuit 9. Accordingly, said signal YL is F
The signal (YH+C) is subjected to FM modulation in the M modulation circuit 6 and then applied to the addition circuit 10 .In parallel, the signal (YH+C) is subjected to low frequency conversion in the recording color frequency conversion circuit 9 and applied to the addition circuit 10 . Therefore, in the adder circuit 10, the low frequency converted signal (YH+C) is superimposed on the FM modulated signal YL so that it can be recorded. Thereafter, the thus superimposed signal is recorded on the video tape via the recording head 83 as a video signal having a frequency interleaving relationship of 1.

As mentioned above, the recording unit 80 converts the applied NTSC signal into Y
It operates by frequency-separating the signal and C signal, performing unique modulation processing on each signal, and recording the resulting video signals on video tape.

Next, the operation during playback will be explained.

In FIG. 3, a reproduction section 90 first supplies a video signal reproduced from a video tape via a reproduction head 91 to a frequency separation circuit 12. Accordingly, the frequency separation circuit 12
Frequency separation is performed into an M signal (reproduced Y signal) and a reproduced low-frequency color signal.

The reproduced FM signal is applied to the next stage FM demodulation circuit 13, where it is demodulated to become a signal PYL as shown in FIG. 4(d), and is applied to the addition circuit 94. In parallel, the reproduced low-frequency color signal is sent to the reproduction color frequency conversion circuit 1 in the next stage.
After passing through 4, the AFC circuit 92 for Y signal and the AP for C signal
C circuit 93 at the same time.

The signal PYH in FIG. 4(d), which is the high-frequency component of the Y signal that has passed through the Y signal AFC circuit 92 and the Y-type filter circuit 2, contains unnecessary signal components due to crosstalk from adjacent tracks, as described above. It is removed and applied to the adder circuit 94. In parallel, APC circuit 93 for C signal and C
The signal PC shown in FIG. 4(f) that has passed through the filter circuit 3 is also supplied to the adder circuit 94 after removing unnecessary signal components due to crosstalk from adjacent tracks.

Therefore, in the adder circuit 94, the signal PYL of FIG. 4(d) and the signal PY of FIG. 4(e) are combined.

and the signal PC in FIG. 4(f) are added, and a signal (py+pc) as shown in FIG. 4(g) is outputted to the outside via the signal output terminal 95.

As described above, the playback unit 90 performs demodulation processing on the Y signal and C signal of the video signal played back from the videotape, and while eliminating unnecessary signal components due to crosstalk from adjacent tracks during playback, the playback unit 90 restores the original Y signal and C signal. A signal processing operation is performed so that the signal and the C signal can be obtained faithfully.

[Problems to be Solved by the Invention] 3 However, in conventional video signal recording and reproducing devices, band limitation is not performed for Y signals and C signals at the time of recording. A phenomenon may occur in which the C signal component mixes with the high-frequency component of the Y signal, or conversely, the C signal component mixes with the high frequency component of the Y signal. This means that even if the Y-type filter circuit 2 and the C-type filter circuit 3 are used to extract the Y signal component and the C signal component during reproduction, there will be no effect, and cross-color and dot interference will occur in the reproduced image. This was a major cause of deterioration in the quality of reproduced images, which was a problem.

By the way, the above-mentioned cross color means that the high frequency component of the Y signal is C.
This is a phenomenon that is mixed into the signal components and appears as irregular striped patterns on the fine pattern parts of the screen. Furthermore, the dot interference refers to a phenomenon in which the C signal component mixes with the Y signal high frequency component and appears as a dot-like luminance change on the screen. In other words, the frequency spectrum of the Y signal is mostly concentrated at the frequency n f , , but since the spectrum of the Y signal component also exists at the frequency (n ± 0.5) fH, The signal will be recorded on the videotape with the signal contamination occurring. The same can be said for the C signal component.

Also, during playback, a Y-type filter circuit 2 and a C-type filter circuit 3 are provided to remove unnecessary signal components due to crosstalk from adjacent tracks, and then the Y signal high-frequency component is added to the FM demodulated Y signal. Although attempts were made to widen the band of the Y signal and achieve higher resolution, if a discrepancy occurs in the group delay characteristics of both the Y-type filter circuit 2 and the C-type filter circuit 3, the frequency spectrum of the signal after passing through the filter will change. Misalignment also occurs, making it impossible to prevent problems such as cross collar and dot interference.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a video signal recording device and a video signal reproducing device that can generate high quality reproduced images free of cross color and dot interference.

[Means for Solving the Problems] A video signal recording device according to the present invention receives a brightness signal and a color signal separated from a video signal including a brightness signal and a color signal having a frequency interleaving relationship, and records the video signal on a recording medium. A video signal recording device for recording a video signal as a video signal, comprising a color signal component removing means for receiving the separated luminance signal and removing a color signal component contained therein; a luminance signal component removing means for removing a luminance signal component included in the luminance signal component, and a luminance signal modulating means for extracting and modulating a low frequency component of the luminance signal from which the color signal component has been removed by the color signal component removing means;
a luminance signal band limiting means for extracting the band component of the luminance signal from which the color signal component has been removed by the color signal component removing means and limiting the band of the luminance signal; color signal band limiting means for extracting band components of the color signal to limit the band of the color signal;
mixing means for mixing the luminance signal band-limited by the luminance signal band-limiting means with the color signal band-limited by the color signal band-limiting means; and modulating the mixed color signal by the mixing means so as to be recordable. and means for superimposing the color signal modulated by the color signal modulation means on the brightness signal modulated by the brightness signal modulation means and recording it on a recording medium. .

Further, a video signal reproducing device according to the present invention is a video signal reproducing device for reproducing a video signal from a recording medium in which a video signal including a luminance signal and a color signal having a frequency interleaving relationship is recorded, means for frequency-separating a luminance signal and a chrominance signal from a video signal recorded on a medium; a luminance signal demodulation means for demodulating the separated luminance signal; and a chrominance signal demodulation means for demodulating the separated chrominance signal. , one filter means for simultaneously separating a luminance signal component and a color signal component contained therein from the color signal demodulated by the color signal demodulating means; and addition means for adding the luminance signal components separated by the filter means.

Since the video signal recording device according to the present invention is configured as described above, the color signal component mixed in the luminance signal component can be removed by using the color signal component removal means and the luminance signal component removal means 7. Furthermore, since it is possible to record on a recording medium after removing the luminance signal component mixed in with the color signal component, it is possible to prevent cross color and dot disturbances from occurring during recording.

Further, since the video signal reproducing apparatus according to the present invention is configured as described above, the filter means can remove unnecessary signal components mixed in due to crosstalk from adjacent tracks during reproduction, and the filter of the filter means can remove unnecessary signal components mixed in due to crosstalk from adjacent tracks during reproduction. The characteristics act simultaneously and in the same way on the luminance signal and color signal in the input reproduced video signal, so the cross color and color signal components that occur when the luminance signal component leaks into the color signal component leak into the luminance signal component. Therefore, it is possible to avoid the causes of dot interference that occur in a crowded manner.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

8. FIG. 1(a) is a schematic diagram showing the functional configuration of a video signal recording section 50 of a camera-type video tape recorder according to an embodiment of the present invention.

The video signal recording unit 50 shown in FIG. 1(a) inputs the Y signal and C signal from the previous stage camera unit or after frequency separation of the NTSC signal through separate input terminals, After modulation processing, the video signal is recorded on a video tape with a frequency interleaving relationship as a video signal. Note that reference symbols for each input/output signal shown in the figure will be described later.

In the figure, the video signal recording section 50 includes a signal input terminal 1a for inputting a Y signal, a signal input terminal 1b for inputting a C signal,
a Y-type filter circuit 2 for removing unnecessary signal components of the Y-signal; inputting the Y-signal after passing through the Y-type filter circuit 2;
A low-pass circuit (hereinafter referred to as LPF) that passes the low-frequency components
(hereinafter referred to as BPF) 4, an FM modulation circuit 6 that performs FM modulation on the signal after passing through the LPF 4; ) 5 included. Further, the video signal recording section 50 includes a C-type filter circuit 3 that receives the C signal from the signal input terminal 1b and removes unnecessary signal components thereof.
, a BPF 7 which inputs the C signal after passing through the C-type filter circuit 3 and passes its band components; an adder circuit 8 which adds the Y signal after passing through the BPF 5 to the signal after passing through the BPF7PF7; and a Y signal output from the adder circuit 8. It includes a recording color frequency conversion circuit 9 and an addition circuit 10 for converting the C signal to which C signals are added to a low frequency.

In addition, in the addition circuit 10, the low frequency converted C of the output of the recording color frequency conversion circuit 9 applied in parallel is applied to the FM signal of the output of the FM modulation circuit 6.
The signals are superimposed. The signals thus superimposed are then recorded on a video tape as a video signal with a frequency interleaving relationship.

FIG. 1(b) is a schematic diagram showing the functional configuration of a video signal reproducing section 60 of a camera-type video tape recorder according to an embodiment of the present invention.

0 The illustrated video signal reproducing unit 60 is configured to reproduce the video signal recorded on the preceding videotape and perform demodulation processing. Note that details of reference symbols of input/output signals shown in the drawings will be described later.

In the figure, the video signal reproducing section 60 includes a signal input terminal 11 that inputs the reproduced video signal from the previous videotape;
It includes a frequency separation circuit 12 that separates the reproduced video signal into a reproduced FM signal and a reproduced low frequency color signal by frequency separation, and an FM demodulation circuit 13 that inputs the reproduced FM signal and demodulates it to the original Y signal.

Furthermore, the video signal reproducing section 60 inputs a reproduction color frequency conversion circuit 14 which frequency-converts the reproduction low-frequency color signal to restore the original C signal, a C signal output from the reproduction color frequency conversion circuit 14, and inputs the C signal output from the reproduction color frequency conversion circuit 14, and A comb filter circuit 15 improves the S/N ratio of the reproduced video signal by removing unnecessary signal components due to crosstalk from the track, and separates the Y signal into a high frequency component and the C signal, and the output of the FM demodulation circuit 13. It includes an adder circuit 16 and signal output terminals 17 and 18 for adding the high frequency component of the Y signal 1 output from the comb filter circuit 15 to the Y signal. The reproduced Y signal and reproduced C signal output from the signal output terminals 17 and 18 are
Both are subjected to signal processing in the reproduction section of the next stage and subsequent stages. Note that the AFC circuit 92 for the Y signal and the AFC circuit 92 for the C signal in FIG.
The illustration and explanation of the PC circuit 93 will be omitted to simplify the explanation.

Here, the comb filter circuit 15 will be explained in detail. The comb filter circuit 15 includes an IH (aqua regia scanning period) delay line 151, an addition circuit 152, and a subtraction circuit 153, as shown in FIG. is configured to remove unnecessary signal components due to crosstalk from adjacent tracks. To explain in detail, the video signal (signal in which the C signal includes a high frequency component of the Y signal) given from the reproduction color frequency conversion circuit 14 in the previous stage is sent to the IH delay line 151, the addition circuit 152, and the subtraction circuit 153. Enter at the same time.

First, the video signal after passing through the IH delay line 151 is given to the addition circuit 152 and the subtraction circuit 153 at the same time with an IH delay relative to the input signal. Accordingly, the adder circuit 152 provides the Y signal obtained by adding the IH delay signal and the input video signal to the adder circuit 16 in the next stage, and the subtracter circuit 1
53 supplies a C signal obtained by subtracting the IH delay signal from the input video signal to the signal output terminal 18 at the next stage. In other words, as mentioned at the beginning, the Y signal and C signal are recorded with a frequency interleaving relationship, so when playing back the IH
If the comb filter circuit 15 using the delay line 151 is used, a signal containing the Y signal high frequency component which is in phase around 18 is inputted to the C signal which is in reverse phase for each IH, and the Y signal high frequency component can be easily converted to the Y signal high frequency component. It is possible to separate the signal and C signal and output them. Furthermore, at this time, unnecessary signal components due to crosstalk from adjacent tracks during reproduction are canceled. That is, the C signal, which has been subjected to low frequency conversion during recording, is recorded as is on track n of the videotape, but its phase is inverted for each IH and recorded on the recording track adjacent to track n. Therefore, during reproduction, the signal read from the n3 track can be reproduced as is, and the signal read from the adjacent track of the n track can be reproduced with the phase reversed for each IH. That is, if the signal is detected after being combined with the IH delay signal in the comb filter circuit 15, unnecessary components due to crosstalk from adjacent tracks can also be removed.

In other words, the comb filter circuit 15 consists of one IH delay line 15.
This can be said to be a filter means that simultaneously separates a Y signal and a C signal using 1. Further, during signal separation, unnecessary signal components due to crosstalk from adjacent tracks during reproduction are also removed, thereby improving the S/N ratio of the reproduced video signal.

FIGS. 2(a) to 2(f) show the input/output signals of each circuit of the video signal recording unit 50 shown in FIG. 1(a) and the recording unit 5.
The video signal recorded on the videotape by
FIG. 6 is a schematic diagram showing waveforms of input and output signals of each circuit when reproduced by the reproducing unit 60 in FIG. In the figure, the frequency of signal 4 is plotted on the horizontal axis, and the amplitude of the signal is plotted on the vertical axis.

Next, FIGS. 1(a) and (b) and FIGS. 2(a) to 2(f) show the recording operation of the video signal and the reproduction operation of the recorded video signal by the recording section 50 and the reproducing section 60. This will be explained in detail with reference to the following.

Note that the reference numerals given to the input/output signals of each circuit in FIGS. 1(a) to 1b) correspond to the numerals given to the waveforms in FIGS. 2(a) to 2f).

Further, in the following explanation, the video signal recorded by the recording unit 50 is reproduced by the reproduction unit 6o, but the recording and reproduction operation is not limited to this, and the recording unit 50 and the reproduction unit 60 are operated independently (mutually). ).

First, during recording, the Y signal from the preceding camera section is first applied to the Y-type filter circuit 2 via the signal input terminal 1a. At the same time, the C signal from the preceding camera section is applied to the C-type filter circuit 3 via the signal input terminal 1b. By the way, the Y signal is a signal with a waveform as shown in Figure 2 (a), and its frequency characteristic has a peak at nfH (n±0.5
) fo also has a signal component, that is, a C signal component, and it can be seen that the signal is in a state where the C signal component is mixed with the Y signal component.

This signal mixing is particularly noticeable in the high frequency components of the Y signal.

The Y signal is given to the Y-type filter circuit 2, and the above-mentioned I
The Y signal from which only the Y signal component, that is, the C signal component present at (n±0.5)fH in FIG. 2(a) has been removed through signal processing using the H delay line 21, is sent to the next LPF 4 and It is given to BPF5 at the same time. Accordingly, LPF4 is C
Only the low frequency component of the Y signal from which the signal component has been removed is passed. That is, a signal YL as shown in FIG. 2(b) is output from the LPF 4 and is applied to the next FM modulation circuit 6. The FM modulation circuit 6 then performs FM modulation on the applied signal and provides the FM modulated signal YL to the next addition circuit 10.

The BPF 5 inputs the 6Y signal from which the C signal component has been removed, and limits the band accordingly to pass only the high frequency component of the Y signal to produce a signal YH as shown in FIG. 2(c).
is applied to the adder circuit 8 at the next stage.

On the other hand, the C signal has a waveform as shown in FIG. 2(d), and has a subcarrier frequency (3.58 MHz) fs
While the signal component exists centered at c, and the frequency characteristic has a peak at (n±0.5)fH, there is also a signal component, that is, a Y signal component, at nf, and the Y signal component exists in the C signal component. It can be seen that the signal is mixed with signal components.

The C signal mixed with the Y signal component as described above is given to the C-type filter circuit 3, and undergoes signal processing using the IH delay line 31 described above to produce only the C signal component, that is, as shown in FIG. 2(d). The signal from which the Y signal component present in nfH has been removed is given to the next BPF 7. Accordingly, the BPF 7 performs band limitation on the C signal from which the Y signal component present in nfH in FIG. 2(d) has been removed, and passes the signal CB as shown in FIG. 2(e) to the next stage. It is applied to the adder circuit 8.

In other words, the signal CB in Figure 2(e) is a signal extracted from which the Y signal component mixed in with the C signal component has been removed, and the band has been further limited around the subcarrier frequency fsc of the C signal. , can be said to be a signal that best contains the C signal component from the camera section.

Now, in the adder circuit 8, the signal YH and the signal CB after passing through the BPFs 5 and 7 in the previous stage are simultaneously given, and the signals are added accordingly, and a signal (YH+CB) as shown in FIG. 2(f) is output. be done. The signal (YH+C
Referring to FIG. 2(f), it can be seen that in the frequency characteristic of B), the peaks of the signal components are clearly separated and exist at nfH and (n±0.5)fH. Thereafter, the signal (YH+CB) is applied to the recording color frequency conversion circuit 9 at the next stage, where it is frequency-converted to a low frequency as in the conventional case and is applied to the addition circuit 10 at the next stage.

Now, in the adder circuit 10, the previous stage FM modulation circuit 6
The low-range color frequency-converted C signal, which is provided in parallel, is superimposed on the FM signal provided from the FM signal. This superimposed signal is recorded on the video tape as a video signal in a frequency interleaving relationship in subsequent stages.

As described above, the video signal recording section 50 inputs the Y signal given from the camera section to the Y-type filter circuit 2 and the BPF.
5, the Y signal from which the mixed C signal component has been removed is taken out, and in parallel, the C signal given from the camera section is similarly filtered by the C type filter circuit 3 and BPF 7 to remove the mixed Y signal. The C signal from which the component has been removed is extracted, and both signals are then subjected to modulation processing and recorded as a video signal on a videotape.

Next, during reproduction, the video signal reproduced from the video tape is first applied to the frequency separation circuit 12 via the signal input terminal 11 of the video signal reproduction section 60. depending on,
The frequency separation circuit 12 frequency-separates the reproduced video signal into a reproduced FM signal and a reproduced low-frequency color signal.

As described above, in the reproducing section 60, the reproduced FM signal and the reproduced low-frequency color signal outputted from the frequency separation circuit 12 are subjected to signal processing such as demodulation processing through separate paths.

The reproduced FM signal is given to the FM demodulation circuit 13 at the next stage. Accordingly, the FM demodulation circuit 13 converts the reproduced FM signal into an FM
The demodulated original signal, ie, the signal YL as shown in FIG. 2(b), is applied to the adder circuit 16 at the next stage.

On the other hand, the reproduced low-range color signal is given to the reproduction color frequency conversion circuit 14 at the next stage. Accordingly, the reproduction color frequency conversion circuit 14 performs a conversion process opposite to that of the recording color frequency conversion circuit 9 to convert it into the original signal, that is, a signal (YH+CB) as shown in FIG. 2(f). It is demodulated and applied to the next comb filter circuit 15. Accordingly, the comb-shaped filter circuit 15 removes unnecessary signal components due to adjacent crosstalk from the input signal (YH+CB) by addition and subtraction processing with the signal that has passed through the IH delay line 151, and adds the signal to the output signals YH and CB. Separate at the same time,
Each signal is output to the next stage circuit.

The signal YH is applied to an adder circuit 1-6. This is then added to the FM demodulated signal YL, resulting in Y
Y as shown in Figure 2(a) where the signal band has been expanded
The signal (however, the mixing of the C signal component is suppressed) is outputted via the signal output terminal 17 and given to the reproduction processing section at the next stage and subsequent stages.

Further, the signal CB is a signal as shown in FIG. 2(e), and is applied to the reproduction processing section at the next stage and subsequent stages via the signal output terminal 18.

As mentioned above, the video signal recorded on the video tape is played back by the video signal playback unit 60, and the played back C signal, that is, the signal CB, is There is no signal component in nfH in the frequency characteristics. In other words, this is a signal in which the Y signal component is not mixed in the C signal component. Similarly, the Y signal is a signal in which no C signal component is mixed in its high frequency components. Therefore, according to the video signal reproducing section 60, it is possible to obtain a Y signal and a C signal in which the causes of cross color and dot interference occurring in the reproduced image are removed.

1 [Effects of the Invention] According to the present invention, mixing of a luminance signal high frequency component into a color signal,
Alternatively, since the color signal is recorded on the recording medium after the mixing of the luminance signal with the high-frequency component is eliminated, it is possible to eliminate the causes of crosstalk and dot interference when recording the video signal.

Also, when reproducing video signals, the reproduced low-range color signal is
Using two filter means, the high frequency component of the luminance signal and the color signal are simultaneously separated while removing unnecessary signal components due to adjacent crosstalk.

Therefore, by using a common filter means that acts uniformly on the luminance signal and the color signal, it is possible to simplify the circuit and reduce the cost.
This has the effect of suppressing the causes of cross color and dot interference during reproduction.

Furthermore, during reproduction, the high-frequency component of the luminance signal obtained after passing through the filter means is added to the luminance signal component obtained by demodulation, so that the resolution of the reproduced image is improved by expanding the band of the luminance signal. There is also the effect that it can be done.

[Brief explanation of drawings]

FIG. 1(a) is a schematic diagram showing the functional configuration of a video signal recording section of a camera-type video tape recorder according to an embodiment of the present invention. FIG. 1(b) is a schematic diagram showing the functional configuration of a video signal reproducing section of a camera-integrated video tape recorder according to an embodiment of the present invention. Figure 2 (a) or f
) is a schematic diagram showing waveforms of input and output signals of each circuit shown in FIGS. 1(a) and 1(b). FIG. 3 is a schematic diagram showing the functional configuration of a conventional video signal recording and reproducing device. FIGS. 4(a) to 4(g) are schematic diagrams showing waveforms of input and output signals of each circuit shown in FIG. 3. In the figure, 2 is a Y-type filter circuit, 3 is a C-type filter circuit, 4 is a low-pass circuit, 5 and 7 are band-pass circuits,
15 is a comb filter circuit and 16 is an adder circuit. In each figure, the same reference numerals indicate the same or corresponding parts. 3 Ward Unexamined Publication Hei 3-262295 (11)

Claims (2)

[Claims] (1) A video signal recording device that receives a luminance signal and a chrominance signal separated from a video signal including a luminance signal and a chrominance signal having a frequency interleaving relationship, and records the received luminance signal and chrominance signal on a recording medium as a video signal, color signal component removing means for receiving the separated luminance signal and removing the color signal component contained therein; a luminance signal component removing means for receiving the separated color signal and removing the luminance signal component contained therein; Luminance signal modulation means for extracting and modulating the low frequency component of the luminance signal from which the color signal component has been removed by the color signal component removal means; luminance signal band limiting means for extracting and limiting the band of the luminance signal; and color signal band limiting means for extracting the band component of the color signal from which the luminance signal component has been removed by the luminance signal component removing means and limiting the band of the color signal. and mixing means for mixing the band-limited color signal modulated by the color signal band-limiting means with the luminance signal band-limited by the luminance signal band-limiting means, and recording the color signal mixed by the mixing means. and means for superimposing the color signal modulated by the color signal modulation means on the brightness signal modulated by the brightness signal modulation means and recording it on a recording medium. , video signal recording device. (2) A video signal reproducing device that reproduces a video signal from a recording medium in which a video signal including a luminance signal and a chrominance signal having a frequency interleaving relationship is recorded, the video signal being reproduced from the video signal recorded on the recording medium. means for frequency-separating a signal and a color signal; a luminance signal demodulation means for demodulating the separated luminance signal; a color signal demodulation means for demodulating the separated color signal; and a color signal demodulated by the color signal demodulation means. one filter means for simultaneously separating a luminance signal component and a color signal component contained therein from the color signal obtained by the color signal; and a luminance signal component separated by the filter means from the luminance signal demodulated by the luminance signal demodulation means. A video signal reproducing device, comprising an adding means for adding.