JPH0567117B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a carrier color signal reproducing device and a recording/reproducing device, and the present invention relates to a carrier color signal reproducing device and a recording/reproducing device that reduce and extract noise contained in a carrier color signal by using a feedback low-pass filter. Regarding equipment.

BACKGROUND ART FIG. 14 shows a circuit diagram of a noise reduction circuit previously proposed by the present applicant in Japanese Patent Application No. 1983-40497 entitled "Noise Reduction Circuit for Carrier Color Signal." This thing is
The carrier color signal A (FIG. 15A) that enters the terminal 1 is passed through a band filter 30 having a pass frequency band narrower than its normal frequency band, and is converted into a signal L (FIG. 15B), and is then converted into a signal L (FIG. 15B) by a phase adjuster 31. The phase is adjusted to take out a narrowband carrier color signal that is delayed by an integral multiple of a half cycle of the color subcarrier with respect to the input carrier color signal, and a comparison calculator 32 compares the input carrier color signal with the narrowband carrier color signal. The color signals are compared and calculated so as to cancel each other out, and the signal C (C in the same figure) obtained by the comparison calculation is passed through the limiter 5 to obtain the signal N (D in the same figure).
Then, the arithmetic unit 8 subtracts the output signal of the limiter 5 from the input carrier color signal to obtain the signal H (E in the same figure).
It is arranged so that it can be taken out from the terminal 9.

Problems to be Solved by the Invention In a VTR that records a carrier color signal by converting it to a low frequency range, noise in the carrier color signal is mostly distributed near the carrier color signal frequency as shown in FIG. To sufficiently reduce the
must have a sufficiently narrow band near the carrier color signal frequency. If this is done, the envelope will be greatly distorted as shown in FIG. 15B, and a difference component will occur over a long period of time as shown in FIG. 15C. During this period, the amplitude is limited by the limiter 5 to the limiter level _L1 , so noise is not completely reduced in this amplitude limited portion.
The problem was that the improvement of the signal-to-noise ratio was a problem.

Also, because the band filter 2 has a narrow band, so-called tails in the horizontal direction occur near the boundaries between colors on the playback screen, and the pass level of the limiter 5 is increased to improve the areas where the SN ratio cannot be improved. When set to , there was a problem that color blurring near the border became more noticeable.

The present invention provides a sufficient noise reduction effect by providing a limiter in the loop of the feedback low-pass filter, reduces color blurring near color boundaries, and provides sufficient noise reduction between the recording system and the reproduction system. It is an object of the present invention to provide a carrier color signal reproducing device and a recording/reproducing device that can provide complementarity.

Means for Solving the Problem In FIG. 5A, the △t delay circuit (△tDLY) 3 is a delay means for delaying the carrier color signal by △t, and the subtracter 4 extracts the output signal of △tDLY3 from the input carrier color signal. The first subtractor for subtraction, the limiter 5, is an amplitude limiting means for limiting the amplitude of the output signal of the subtracter 4, the coefficient circuit 6 is a coefficient adding means for attenuating the output signal level of the limiter 5, and the subtracter 2 is a coefficient circuit 6. This is an embodiment of a second subtracter which subtracts the output signal of . from the input carrier chrominance signal to provide the feedback input of ΔtDLY3 and outputs it as a reproduced carrier chrominance signal.

Effect: △tDLY3 delays the carrier color signal by a minute amount of 1H or less, and subtracter 4 extracts △ from the input carrier color signal.
The output signal of tDLY3 is subtracted, the limiter 5 limits the amplitude of the output signal of the subtracter 4, the coefficient circuit 6 attenuates the output signal level of the limiter 5 to remove noise, and the subtracter 2 limits the amplitude of the output signal of the subtracter 4. The output signal of ΔtDLY3 is subtracted from the input carrier color signal to reduce noise, and is used as a feedback input of ΔtDLY3, and is output as a reproduced carrier color signal.

Embodiment FIG. 1 shows a block system diagram of the main parts of a first embodiment of the apparatus of the present invention. FIG. 2 shows a schematic block system diagram of the entire apparatus of the present invention. In the reproduction system shown in FIG.
The video signal reproduced at
It is supplied to the frequency converter 107 via the switch 106 and returned to the original frequency, and then the bandpass filter 10
8. The signal is supplied to the noise reduction and complementary circuit 110 via the switch 109 for noise reduction, is mixed with the reproduced luminance signal separated by the reproduced luminance signal processing circuit 112 via the switch 111 in the mixing circuit 113, and is sent to the terminal. 114.

Returning to Figure 1, the circuit shown in Figure 2 is similar to Figure 2.
is applied to the noise reduction and complementary circuit 110 of
(Fig. 3A) is supplied to a feedback low-pass filter composed of subtracters 2, 4, ΔtDLY 3, limiter 5, and coefficient circuit 6, and is band-limited to a predetermined band.
At ΔtDLY3, the reproduced carrier color signal a in FIG. 3A is feedback-delayed by an integral multiple of the half cycle of the color subcarrier to produce a signal b (FIG. 3B). And subtractor 4
At , the reproduced carrier signal a and the delayed signal b are subtracted so as to cancel each other out to form a signal c (C in the figure). The signal c is amplitude limited by a limiter 5 to a limiter level _L1 to become a signal d (D in the figure), which is multiplied by a coefficient _k1 by a coefficient circuit 6.
The signal is supplied to the subtracter 2 mentioned above. Note that noise generally has a high frequency, and when the frequency of the signal is low, such as in the case of a flat pattern, only noise appears in the output of the limiter 5.

The signal d is multiplied by a coefficient k2 in the coefficient circuit 7, and the signal d is multiplied by a coefficient _k2 in the coefficient circuit 7, and the signal d is multiplied by the coefficient k2 in the subtracter 8 from the reproduced carrier color signal a.
The output signal d is subtracted to obtain a signal e (E in the figure) with sufficiently reduced noise, which is taken out from the terminal 9. In this case, the degree of noise reduction is determined by the coefficients k ₁ and k ₂ of the coefficient circuits 6 and 7.

By providing the limiter 5, the coefficient _k1 of the coefficient circuit 6 is made small for large amplitude high-frequency signals, and as a result, the cutoff frequency of the feedback low-pass filter becomes high for large amplitude high-frequency signals. This increases the response speed. Therefore, the vertical resolution can be improved better than the conventional one.

FIG. 4 shows a block system diagram of the main parts of a second embodiment of the device of the present invention, and in the figure, parts are given the same numbers as those in FIG. 1, and their explanation will be omitted. In this embodiment, a coefficient circuit 6 is provided between a subtracter 4 and a limiter 5, and the operation and effect are similar to those of the first embodiment.

5A and 5B respectively show a block system diagram and a specific circuit diagram of the main parts of the third embodiment of the device of the present invention, and in the figures, the same parts as in FIG. 1 are given the same numbers. The explanation will be omitted. This circuit is simplified by using the coefficient circuit 22 of the coefficient k when the coefficients k ₁ and k ₂ of the coefficient circuits 6 and 7 are equal in the circuit shown in the first figure.

Let us now consider the principle of improving the SN ratio according to this embodiment. As shown in FIG. 6, if the input carrier color signal at the present moment is xn, and the one at a point a·Δt (a is a positive integer) before is xn-a, then
The output signal yn when the amplitude signal is small enough to pass through the limiter 5 becomes yn=(1-k)(xn+kxn- ₁ + ^k2xn - ₂ +...), if the limiter 5 is ignored. For the signal component of the color flat part, each xn
-a are equal, and if we set xn = xn- ₁ = xn- ₂ =...=X, then yn = (1-k) {x/(1-k)} = Output.

On the other hand, as for noise, noises at times separated by Δt are added in the subsequent stage k ^a , so these are averaged due to the random nature of the noises, and the SN ratio is improved.

At the large amplitude boundary of colors, a large difference component is generated in the subtracter 4 during the first time Δt, and this is cut off by the limiter 5, so that the SN ratio is not improved. However, from the next △t, the difference component from the subtracter 4 becomes smaller and passes through the limiter 5, so the previous △T is averaged with the time information,
Although the amount of improvement is not as great as when averaging from a previous point in time, the SN ratio is still improved.

The SN ratio improvement effect is achieved when the value of k is close to 1 (however,
The value becomes larger as k<1), but if the remainder is too close to 1, it becomes unstable due to variations in circuit constants, etc.
Moreover, when it exceeds 1, an oscillation state occurs. Also, the smaller the value of △t, the smaller the area where the SN ratio is not improved at the color boundary, but in order to obtain the same amount of improvement, it is necessary to make the value of k closer to 1. . This is because when Δt is small, if the same k is used, only nearby signals are averaged, and low-frequency noise is not improved.

Actually, based on the above and the effect on the playback screen, △
t and k need to be determined, for example Δt=
500 ns, k=0.9 to 0.95.

FIG. 7 shows a block system diagram of the main parts of the fourth embodiment of the device of the present invention, and in the figure, the same parts as in FIG. 1 are given the same numbers and their explanations will be omitted. This is a noise reduction and complementary circuit 110 in the reproduction system and recording system of the magnetic recording and reproduction apparatus shown in FIG.
applied to. In this recording system, terminal 115
The incoming video signal is separated from the carrier color signal by a band filter 116, and is supplied to the frequency converter 107 via the switch 104, the ACC circuit 105, the switch 109, the noise reduction and complementary circuit 110, the switch 111, and the switch 106. is converted into a low frequency signal, passed through a low frequency filter 117, mixed with a recording luminance signal separated by a recording luminance signal processing circuit 118 in a mixing circuit 119, amplified by an amplifier 120, and then sent to a recording head 121. magnetic tape 10
Recorded as 0.

In FIG. 7, switch 10 is connected to terminal R during recording. Recording transport color signal input to terminal 1
a' (noise-free signal a shown in FIG. 3A) is passed through the subtracter 2 to become the signal b' at ΔtDLY3, and then passed through the subtracter 4 to the coefficient circuit 12 where it is converted into the coefficient k ₂
is multiplied by the signal c' (signal c shown in FIG. 3C, which does not include noise). The signal c' is amplitude-limited by the limiter 5 to a limiter level _L1 to become a signal d' (which does not include the noise of the signal d shown in FIG. 2D), and is supplied to the subtracter 2. The limiter 5 suppresses the large amplitude of the high frequency components of the input recording/carrying color signal. In this case, since the period cut by the limiter 5 is shorter than that of signal d in FIG. 15D, the portion where the SN ratio is not improved becomes smaller.

The signal d′ is multiplied by a coefficient k ₃ in the coefficient circuit 11,
The signal is added to the input signal a' in the adder 13, whereby the high frequency components are increased non-linearly to form a signal f (FIG. 3F), which is taken out at the terminal 14.

On the other hand, the switch 10 is connected to the terminal P during reproduction. In this case, the operation is substantially the same as that explained in FIG. 1, so the explanation thereof will be omitted.

Since the recording system uses the same circuit as the playback system, the recording system and playback system can maintain complementarity, and in this case, the correction settings of the recording system are restricted to the settings of the playback system. It can be done without any trouble.

FIG. 8 shows a block system diagram of the main parts of the fifth embodiment of the device of the present invention, in which the same parts as in FIGS. 1, 4, and 7 are given the same numbers and explained. omitted. When recording, switch 10 is connected to terminal R. The recording conveyance color signal a' inputted to the terminal 1 is supplied to the adder 2 via the subtracter 2, ΔtDLY3, the subtracter 4, the coefficient circuit 15, and the switch 10.

The signal from the subtracter 4 passes through the coefficient circuit 12 and is amplitude-limited by the limiter 16 to a limiter level _L2 to become a signal d', which is added to the input recording and conveyance color signal a' by the adder 13 to form a signal g( G) in FIG. 3, and is taken out from the output terminal 14.

On the other hand, the switch 10 is connected to the terminal P during reproduction. In this case, the operation is substantially the same as that explained in FIG. 1, so the explanation thereof will be omitted.

Further, since the effect is the same as that of the fourth embodiment shown in FIG. 7, the explanation thereof will be omitted.

FIG. 9 shows a block system diagram of the main parts of the sixth embodiment of the device of the present invention, in which the same parts as in FIGS. 1, 4, and 7 are given the same numbers and explained. omitted. When recording, switch 10 is connected to terminal R. The recording conveyance color signal a' that has entered the terminal 1 is converted into a signal c' via an adder 18, a subtracter 2, △tDLY3, and a subtracter 4, and is sent to a limiter 5 via a coefficient circuit 6.
The amplitude of the signal d' is limited at , and the signal d' is supplied to the subtracter 2.

The signal d' is multiplied by a coefficient _k2 in the coefficient circuit 7 to become a high-frequency component signal with a limited amplitude, and is supplied to the adder 18 via the switch 10, and the signal is
It is added with a' to form a signal g, which is taken out from the terminal 14.

On the other hand, during playback, switch 10 is connected to P.
In this case, the operation is substantially the same as that explained in FIG. 1, so the explanation thereof will be omitted.

Here, complementarity will be considered using transfer functions in the reproduction system and recording system. In FIG. 9, assuming that the circuits commonly used during reproduction and recording, that is, the subtracters 2, 4, ΔtDLY 3, limiter 5, and coefficient circuits 6, 7 are the transfer function circuit 19 of the transfer function G(S), this reproduction system circuit is as shown in FIG. 10A, and the transfer function from terminal 1 to terminal 9 is 1-G(S). On the other hand, the recording system circuit becomes as shown in B, and the transfer function from terminal 1 to terminal 14 is 1/{1
−G(S)}.

The reproduction system circuit and the recording system circuit of this embodiment have completely opposite characteristic relationships, and more perfect complementarity can be obtained than those of the fourth and fifth embodiments. Moreover, this structure is simple and can be constructed at low cost.

FIG. 11 shows a block system diagram of the main parts of the seventh embodiment of the device of the present invention. In the figure, the same parts as in FIGS. 1 and 9 are given the same numbers and their explanations are omitted. This circuit is simplified by using the coefficient circuit 22 of the coefficient k when the coefficients k ₁ and k ₂ of the coefficient circuits 6 and 7 are equal in the circuit shown in FIG.

During recording, the recording conveyance color signal a' that enters the terminal 1 is converted into a signal c'' via an adder 18, a subtracter 2, △tDLY3, and a subtracter 4, and is amplitude-limited by a limiter 5 to become a signal d''. is multiplied by a coefficient k in the coefficient circuit 22 to produce a signal e''.The signal e'' is output from the switch 10.
The signal is supplied to the adder 18 via the signal a', and is added to the signal a' to form the signal g'', which is taken out from the terminal 14.

This circuit can be more simplified in circuitry than the sixth embodiment shown in FIG. 9, and can be constructed at a lower cost.

FIGS. 12A and 12B show a block system diagram and a specific circuit diagram, respectively, of essential parts of an eighth embodiment of the apparatus of the present invention. In the same figure, the terminal 23 is the switch 109 in FIG.
The PB circuit 24, which is the terminal to which the output of the terminal R or the output of the terminal P is input, is a circuit shown in FIG. 5, and is a circuit having a transfer function G(S).

During playback, the output of the terminal P of the switch 109 is supplied to the + input terminal of the amplifier 25, and the output of the amplifier 25 is supplied to the - input terminal of the amplifier 25 and the PB circuit 24. It is extracted as a G(S) signal. On the other hand, during recording, the output of terminal R of switch 109 is output from amplifier 25.
is supplied to the + input terminal of the amplifier 25, and the output of the amplifier 25 is
The signal is supplied to the - input terminal of the amplifier 25 via the PB circuit 24, and taken out from the amplifier 25 as a signal with a transfer function of 1/G(S).

FIG. 13 shows a block system diagram of the main parts of the ninth embodiment of the apparatus of the present invention, and in this figure, the same parts as in FIG. 12 are given the same numbers. In the figure, the terminal 26 is the second
The output of the terminal R of the switch 109 in the figure and the terminal 27 are the terminals to which the output of the terminal P of the switch 109 in FIG. 2 is input, respectively.

This circuit also has terminal 9, similar to the circuit shown in Figure 12.
A reproduction transport color signal having a transfer function G(S) is taken out from the terminal 14, while a recording transport color signal having a transfer function 1/G(S) is taken out from the terminal 14.

In the eighth and ninth embodiments, the reproduction system and the recording system have completely opposite characteristic relationships, as in the case of FIG. 9, and more perfect complementarity can be obtained.

It should be noted that the second embodiment shown in Figure 4 and the third embodiment shown in Figures 5A and B are provided with a coefficient circuit corresponding to the recording system, and the two coefficient circuits are switched during recording and reproduction. It may be configured to switch by.

Furthermore, the PB circuit 24 shown in FIGS. 12 and 13 may be configured as shown in FIG. 4 or as shown in FIG. 5A.

Effects of the Invention The device of the present invention includes a delay circuit that extracts a carrier color signal delayed by a period that is an integral multiple of a half cycle of a color subcarrier, and a first delay circuit that subtracts the output signal of the delay circuit from the input carrier color signal. a subtracter, a limiter for limiting the amplitude of the output signal of the first subtractor, a coefficient circuit for attenuating the output signal level of the limiter, and a coefficient circuit for subtracting the output signal of the coefficient circuit from the input carrier chrominance signal to produce the delay. By providing a second subtractor that serves as a feedback input to the circuit and outputs it as a reproduced carrier color signal, it is possible to obtain a sufficient noise reduction effect, prevent deterioration of vertical resolution, and reduce color blurring near color boundaries. In addition, the first coefficient circuit and the second coefficient circuit attenuate the output signal level of the limiter, and the output signal of the first coefficient circuit is selected during recording, and the output signal of the second coefficient circuit is selected during playback. a second subtracter that subtracts the output signal of the switch from the input carrier chrominance signal as a feedback input of the delay circuit; and a third coefficient circuit that attenuates the output signal level of the limiter. Since an adder is provided that adds the output signal of the third coefficient circuit and the input carrier color signal and outputs the result as a recording carrier color signal, it is possible to have sufficient complementarity between the recording system and the reproduction system. It has characteristics.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the essential parts of the first embodiment of the device of the present invention, FIG. 2 is a schematic block diagram of the entire device of the present invention, and FIG. 3 is a signal waveform diagram of the first embodiment. 4 is a block system diagram of the main part of the second embodiment of the device of the present invention, FIGS. 5A and B are block system diagrams and specific circuit diagrams of the main part of the third embodiment of the device of the invention, and The figure is a diagram for explaining the amount of signal delay, Figures 7 to 9 are block diagrams of the main parts of the fourth to sixth embodiments of the device of the present invention, and Figure 10 is the sixth embodiment described above. Equivalent block diagram, No. 11
12 and 13 are schematic block diagrams of essential parts of the eighth and ninth embodiments of the apparatus of the present invention, respectively. and FIG. 15 are a circuit diagram and a signal waveform diagram of a noise reduction circuit previously proposed by the applicant, respectively;
FIG. 16 is a diagram for explaining noise included in the carrier color signal. 1, 23, 26, 27... Carrier color signal input terminal, 2, 4, 8... Subtractor, 3... △t delay circuit, 5, 16... Limiter, 6, 7, 11, 1
2, 15, 17, 20, 21, 22...Coefficient circuit, 9...Reproduction carrier color signal output terminal, 10...Switch, 13, 18...Adder, 14...Record carrier color signal output terminal, 24 ...PB circuit, 25...
Amplifier, 100...Magnetic tape, 101...Reproduction head, 110...Noise reduction and complementary circuit, 1
15...Video signal input terminal, 121...Recording head.

Claims (1)

[Scope of Claims] 1. A delay circuit that receives a carrier color signal and extracts a carrier color signal that is delayed by an integral multiple of a half period of a color subcarrier with respect to the input carrier color signal, and the input carrier color a first subtracter that subtracts the output signal of the delay circuit from a signal; a limiter that limits the amplitude of the output signal of the first subtractor; a coefficient circuit that attenuates the output signal level of the limiter; A second subtractor that subtracts the output signal of the circuit from the input carrier color signal to provide a feedback input to the delay circuit and outputs the signal as a reproduced carrier color signal. Device. 2. A delay circuit receiving a carrier color signal and extracting a carrier color signal delayed by an integral multiple of a half period of a color subcarrier with respect to the input carrier color signal; a first subtracter that subtracts an output signal; a first coefficient circuit that attenuates the output signal level of the first subtractor; a limiter that limits the amplitude of the output signal of the first coefficient circuit; a second subtracter that subtracts the output signal of the limiter from the input carrier chrominance signal to provide a feedback input of the delay circuit; and a second subtracter that attenuates the output signal level of the limiter.
and a third subtractor that subtracts the output signal of the second coefficient circuit from the input carrier color signal and outputs the result as a reproduced carrier color signal. Device. 3. A delay circuit receiving a carrier color signal and extracting a carrier color signal delayed by an integral multiple of a half period of a color subcarrier with respect to the input carrier color signal; a first subtracter that subtracts an output signal; a first coefficient circuit and a second coefficient circuit that attenuate the output signal level of the first subtractor; and a first coefficient circuit and a second coefficient circuit that attenuate the output signal level of the first subtracter; a switch that selects the output signal of the second coefficient circuit during reproduction; a limiter that limits the amplitude of the output signal of the switch; and a limiter that subtracts the output signal of the limiter from the input carrier color signal to delay the signal. a second subtracter that uses the circuit as a feedback input, a third coefficient circuit that attenuates the output signal level of the limiter, and adds the output signal of the third coefficient circuit and the conveyed color signal to convey the recording. The present invention is characterized by being provided with an adder that outputs a color signal, and a third subtracter that subtracts the output signal of the third coefficient circuit from the input carrier color signal and outputs the result as a reproduced carrier color signal. Carrier color signal recording and reproducing device. 4. A delay circuit receiving a carrier color signal and extracting a carrier color signal delayed by an integral multiple of a half period of a color subcarrier with respect to the input carrier color signal; a first subtracter that subtracts an output signal; a first coefficient circuit, a second coefficient circuit, and a third coefficient circuit that attenuate the output signal level of the first subtracter; and the second coefficient circuit. a first limiter that limits the amplitude of the output signal of the third limiter;
a second limiter that limits the amplitude of the output signal of the coefficient circuit; a switch that selects the output signal of the first coefficient circuit during recording and selects the output signal of the first limiter during playback; a second subtracter that subtracts the output signal of the input transport color signal from the input transport color signal and provides the feedback input of the delay circuit, and adds the output signal of the second limiter and the input transport color signal to obtain the recording transport color signal. an adder for outputting a signal; a fourth coefficient circuit for attenuating the output signal level of the first limiter; and a fourth coefficient circuit for attenuating the output signal level of the first limiter;
A carrier color signal recording/reproducing apparatus comprising: a third subtracter for subtracting the output signal of the coefficient circuit of the subtractor and outputting the result as a reproduced carrier color signal. 5. A delay circuit that receives a carrier color signal and extracts a carrier color signal that is delayed by an integral multiple of a half cycle of the color subcarrier with respect to the input carrier color signal, and a first subtracter that subtracts an output signal; a first coefficient circuit that attenuates the output signal level of the first subtractor; a limiter that limits the amplitude of the output signal of the first coefficient circuit; a second subtracter that subtracts the output signal of the limiter from the output signal of the adder to provide a feedback input of the delay circuit; a second coefficient circuit that attenuates the output signal level of the limiter; and a second coefficient circuit that attenuates the output signal level of the limiter; a switch for selecting the output signal of the coefficient circuit No. 2; an adder for adding the output signal of the switch and the input transport color signal and outputting the result as a recording transport color signal; 1. A carrier color signal recording and reproducing apparatus comprising: a third subtracter that subtracts the output signal of the second coefficient circuit and outputs the result as a reproduced carrier color signal. 6. A delay circuit that receives a carrier color signal and extracts a carrier color signal that is delayed by an integral multiple of a half period of the color subcarrier with respect to the input carrier color signal, and a first subtracter that subtracts the output signal; a limiter that limits the amplitude of the output signal of the first subtractor; a coefficient circuit that attenuates the output signal level of the limiter; a second subtracter for subtracting from the output signal of the adder and using it as a feedback input of the delay circuit and outputting it as a reproduced carrier color signal; a switch for selecting the output signal of the coefficient circuit at the time of recording; A carrier color signal recording and reproducing apparatus characterized by the above-mentioned adder for adding an output signal and the input carrier color signal and outputting the result as a record carrier color signal. 7. A delay circuit that receives a carrier color signal and extracts a carrier color signal delayed by an integral multiple of a half period of a color subcarrier with respect to the input carrier color signal; a first subtracter that subtracts the output signal; a limiter that limits the amplitude of the output signal of the first subtractor; a coefficient circuit that attenuates the output signal level of the limiter; a second subtracter that subtracts the signal from the input carrier color signal and outputs it as a feedback input of the delay circuit and as a reproduced carrier color signal; the output signal of the second subtracter is selected during recording, and the output signal of the second subtractor is selected during playback; A switch for selecting a carrier color signal, and an input carrier color signal separated from the recorded video signal or an input carrier color signal separated from the reproduced video signal to the + input terminal.
A carrier color signal, characterized in that the output signal of the switch is supplied to each input terminal, and an amplifier is provided for supplying the output to the input of the second subtracter and outputting it as a recording carrier color signal. Recording and playback device. 8 A delay circuit that receives a carrier color signal and extracts a carrier color signal delayed by an integral multiple of a half period of a color subcarrier with respect to the input carrier color signal; a first subtracter that subtracts the output signal; a limiter that limits the amplitude of the output signal of the first subtractor; a coefficient circuit that attenuates the output signal level of the limiter; a second subtracter that subtracts the input carrier color signal from the input carrier color signal and outputs it as a feedback input of the delay circuit and outputs it as a reproduced carrier color signal; 2
The output signal of the subtracter is supplied to each input terminal, and the output is output as a recording carrier color signal, and the output of the amplifier is selected during recording, and the input carrier color is separated from the reproduced video signal during playback. A carrier color signal recording/reproducing apparatus comprising a switch for selecting each signal and supplying the signal to the first subtracter as the carrier color signal.