JPH0773371B2 - Color signal recording circuit and color signal recording / reproducing apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording and reproducing an NTSC color television signal, for example, and more particularly to a recording / reproducing apparatus for improving the S / N ratio of a reproduced carrier color signal.

[0002]

2. Description of the Related Art Conventionally, as a recording / reproducing apparatus for recording and reproducing image information, for example, a helical scan type video tape recorder (V) equipped with a rotary magnetic head.
TR) is used. By the way, consumer-use video tape recorders used in general households are roughly classified into two types, so-called stationary type and portable type. The former is mainly intended to be used for recording broadcast programs indoors, and usually has a built-in tuner. The latter is mainly intended for outdoor shooting with a video camera and usually has no built-in tuner, but it can also be used for recording broadcast programs by connecting a separate tuner. .

When recording a broadcast program with such a consumer video tape recorder, the video signal obtained by detecting the video intermediate frequency signal from the tuner is usually classified into a luminance signal and a carrier color signal. To be done. The luminance signal is subjected to frequency modulation (FM) or the like, and the carrier color signal is subjected to frequency conversion into a low frequency or the like. It is designed to be recorded on a magnetic tape via.

At the time of reproduction, the signal recorded on the magnetic tape is reproduced by the magnetic head, contrary to the case of recording.
It is separated into a luminance signal component and a carrier color signal component. Then, the components of the luminance signal are subjected to demodulation and the like, and the components of the carrier color signal are subjected to processes such as frequency conversion to a high frequency band. It is designed to be used. [Problems to be solved by the invention]

[0005]

By the way, the carrier color signal in the video signal included in the television signal actually transmitted from the broadcasting station rarely becomes a large level, and in general, it is small. Often at the level. For this reason,
For example, when a broadcast program is recorded by a consumer video tape recorder as described above, especially when the carrier color signal is at a low level, the S / N ratio of the reproduced carrier color signal at the time of reproduction is deteriorated. As a result, the deterioration of the image quality becomes noticeable visually.

In order to improve the S / N ratio of the reproduced carrier color signal, it is most effective to increase the current value of the signal supplied to the magnetic head, that is, the recording current. However, considering the time when the carrier color signal became a large level,
In order to secure the dynamic range, there has been a problem that the recording current cannot be constantly increased.

Therefore, the present invention has been proposed in view of the above-mentioned conventional problems, and when the carrier color signal at the time of signal recording is at a small level, the S of the reproduced carrier color signal at the time of signal reproduction is proposed. An object of the present invention is to provide a color signal recording circuit and a color signal recording / reproducing device capable of preventing the deterioration of the / N ratio.

[0008]

A color signal recording circuit according to the present invention detects a burst signal in a carrier color signal to be recorded and amplifies the reproduced carrier color signal with a gain corresponding to the level of the burst signal. The carrier color signal level control means for making the level of the burst signal constant, the burst emphasis means for amplifying only a predetermined amount of the burst signal in the carrier color signal output from the carrier color signal level control means, and the burst Frequency conversion means for converting the carrier frequency of the carrier color signal supplied from the emphasis means to a low frequency range, and the maximum value of the carrier color signal output from the carrier color signal level control means are detected, and the maximum value is detected. A maximum value detecting means for outputting a control signal, a time constant means supplied with the control signal from the maximum value detecting means, and a maximum value detecting means from the maximum value detecting means via the time constant means. The gain is controlled in accordance with the supplied control signal, and the gain control amplification means for amplifying the low-frequency conversion carrier color signal supplied from the frequency conversion means, and the gain control amplification means change the level from a small level to an intermediate level. The low-frequency conversion carrier color signal is amplified with a large gain, and the low-frequency conversion carrier color signal of medium to high levels is amplified with a small gain.

Further, the color signal recording / reproducing apparatus according to the present invention detects the burst signal in the carrier color signal to be recorded, amplifies the reproduced carrier color signal with a gain according to the level of the burst signal, and The carrier color signal level control means for making the level of the burst signal constant, the burst emphasis means for amplifying only the burst signal in the carrier color signal output from the carrier color signal level control means by a predetermined amount, and the burst emphasis means A frequency conversion means for converting the carrier frequency of the carrier color signal supplied to a low frequency band, and a maximum value of the carrier color signal output from the carrier color signal level control means are detected, and a control signal corresponding to the maximum value is detected. Maximum value detecting means for outputting, time constant means for supplying the control signal from the maximum value detecting means, and low frequency conversion carrier color signal for supplying from the frequency converting means. In addition, the gain is controlled in accordance with the control signal supplied from the maximum value detecting means through the time constant means, and the low-range to medium-level low-frequency conversion carrier color signal is amplified with a large gain. Gain control amplifying means for amplifying low to high level low frequency conversion carrier color signal with a small gain, and low frequency conversion carrier color signal supplied from the gain control amplification means to a recording medium together with a luminance signal processed separately. Recording means for recording, reproducing means for reproducing a signal recorded by the recording means from a recording medium, and reproducing low-pass converting carrier for supplying a reproducing low-pass converting carrier color signal separated from the reproducing signal by the reproducing means. Color signal level control means, frequency conversion means for converting the low frequency conversion carrier frequency of the reproduction low frequency conversion carrier color signal supplied from the reproduction low frequency conversion carrier color signal level control means to the original carrier frequency, A burst de-emphasis means for attenuating the level of the burst signal in the reproduction carrier color signal supplied from the frequency conversion means by a predetermined amount, and the reproduction low frequency conversion carrier color signal level control means is supplied from the burst de-emphasis means. Detected the level of the burst signal in the reproduced carrier color signal,
The reproduced low frequency conversion carrier color signal is amplified so that the level of the burst signal is constant, and the response speed of the gain control amplification means is adjusted by the time constant means to the reproduction low frequency conversion carrier color signal level control means. The feature is that the response speed is limited within the range.

[0010]

In the color signal recording circuit according to the present invention, the carrier color signal level control means detects the burst signal in the carrier color signal to be recorded, and the reproduced carrier color signal is reproduced with a gain corresponding to the level of the burst signal. A), the level of the burst signal is made constant, and then a predetermined amount of only the burst signal in the carrier color signal is amplified by the burst emphasis means,
Further, the frequency conversion means converts the carrier frequency of the carrier color signal to a low frequency band. Further, the maximum value of the carrier color signal output from the carrier color signal level control means is detected by the maximum value detecting means, and a control signal corresponding to this maximum value is supplied to the gain control amplifying means via the time constant means. Then, the gain of the gain control amplification means is controlled by the control signal. The gain control amplification means amplifies the low-range converted carrier color signal of low level to medium level with a large gain, and amplifies the low-range converted carrier color signal of medium level to large level with a small gain.

In the color signal recording / reproducing apparatus according to the present invention, the carrier color signal level control means detects the burst signal in the carrier color signal to be recorded, and the reproduced carrier color is reproduced with a gain corresponding to the level of the burst signal. After amplifying the signal and making the level of the burst signal constant, the burst emphasis means amplifies only the burst signal in the carrier color signal by a predetermined amount, and the frequency conversion means lowers the carrier frequency of the carrier color signal. Convert. Further, the maximum value of the carrier color signal output from the carrier color signal level control means is detected by the maximum value detecting means, and a control signal corresponding to this maximum value is supplied to the gain control amplifying means via the time constant means. Then, the gain of the gain control amplification means is controlled by the control signal. Further, the gain control amplifying means amplifies the low-range converted carrier color signal of small level to medium level with a large gain, and amplifies the low-range converted carrier color signal of medium level to large level with a small gain. The recording means records the low-frequency conversion carrier color signal supplied from the gain control amplification means on the recording medium together with the luminance signal subjected to the separate signal processing. Further, the reproduction low-frequency conversion carrier color signal level control means to which the reproduction low-frequency conversion carrier color signal separated from the reproduction signal obtained by reproducing the signal recorded by the recording means from the recording medium by the reproducing means is provided. The level of the burst signal in the reproduced carrier color signal supplied from the burst de-emphasis means is detected, and the reproduced low frequency conversion carrier color signal is amplified so that the level of the burst signal becomes constant. The frequency conversion means converts the low frequency conversion carrier frequency of the reproduction low frequency conversion carrier color signal level control means supplied from the reproduction low frequency conversion carrier color signal level control means to the original carrier frequency, and the burst de-emphasis means The level of the burst signal in the reproduced carrier color signal supplied from the frequency conversion means is attenuated by a predetermined amount. Further, the time constant means limits the response speed of the gain control amplification means within the response speed of the reproduction low frequency conversion carrier color signal level control means.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In this embodiment, the present invention is applied to a helical scan type video tape recorder.

FIG. 1 is a block diagram showing a processing system of a carrier color signal at the time of signal recording in the video tape recorder of this embodiment. For example, a video signal obtained by detecting a video intermediate frequency signal from a tuner (not shown) is separated into a luminance signal and a carrier color signal, and this carrier color signal S _RA is signal input terminal 1 or ACC (automatic color signal control). ) Is supplied to the amplifier circuit 2. The color subcarrier, which is the carrier of the carrier color signal S _RA , is 3.58 MHz here. The signal S _RB output from the ACC amplifier circuit 2 is sent to the burst emphasis circuit 3 and the peak hold circuit 20 via the burst gate circuit 4 and the terminal 11. In the burst gate circuit 4, the supplied signal S
Only the burst signal b included in _RB is taken out, and this signal is detected by the ACC detection circuit 5 as a continuous wave of 3.58 MHz. Then, a DC voltage proportional to the level of the burst signal b is sent from the ACC detection circuit 5 to the ACC amplification circuit 2 to change the gain of the ACC amplification circuit 2. That is, so-called feedback control is performed by the loop formed by the ACC amplifier circuit 2, the burst gate circuit 4, and the ACC detection circuit 5, and the AC
The carrier color signal S so that the level of the burst signal b included in the signal S _RB output from the C amplifier circuit 2 is always constant.
_RA is amplified by the ACC amplifier circuit 2.

[0014] On the other hand, the signal S _RB only burst signal b included in the signal S _RB by the burst emphasis circuit 3 are predetermined amount amplified and sent to a frequency conversion circuit 6. In the frequency conversion circuit 6, for example, A (not shown)
The converted carrier wave of 4.27 MHz sent from the FC circuit is balanced-modulated, and this signal and the burst emphasis circuit 3
The difference signal (688 kHz) from the signal of 3.58 MHz from (4) is sent to the low-pass filter 7. That is, the carrier frequency of the signal from the burst emphasis circuit 3 is low-frequency converted from 3.58 MHz to 688 kHz by the frequency conversion circuit 6, and the low-frequency carrier color signal S _RC is obtained through the low-pass filter 7. Become. The low-frequency carrier color signal S _RC is sent to the voltage control amplifier circuit 40 via the terminal 12.

The peak value of the signal S _RB sent to the peak hold circuit 20 is held by the peak hold circuit 20 (so-called peak detection), and a DC voltage proportional to the level of the signal S _RB is obtained. Then, this voltage is sent to the voltage control amplifier circuit 40 via the low-pass filter 30, and the gain of the voltage control amplifier circuit 40 is changed. That is, so-called feedforward control is performed by the peak hold circuit 20, the low-pass filter 30, and the voltage control amplifier circuit 40, and the low-frequency carrier color signal S is gained with a gain corresponding to the level of the signal S _RB from the ACC amplifier circuit 2. _RC is amplified. The low-frequency carrier color signal S _RC amplified by the voltage control amplifier circuit 40 is output from the signal output terminal 13 as the signal S _RD via the limiter circuit 50. Here, the low-pass filter 30 is for limiting the response speed so that the feedback loop of the ACC in the processing system of the reproduction carrier color signal at the time of signal reproduction described later can sufficiently respond and respond, and the limiter circuit described above. Reference numeral 50 is for limiting the amplitude so that an excessive current does not flow when the signal level changes from a small level to a large level.

As described above, the processing system of the carrier color signal at the time of signal recording in this embodiment is the same as the conventional processing system except that the peak hold circuit 20, the low-pass filter 30, the voltage control amplifier circuit 40, and the limiter circuit 50 are provided. In other words, the configuration is such that the compression circuit 10 for performing the compression operation of the level width of the large and small signals, that is, the dynamic range is added. This processing system, for example, as shown by the solid line in FIG.
An approximate circle that amplifies with a large gain when the input signal (carrier color signal) S _RA is between a small level and a medium level, and amplifies with a small gain when the signal S _RA is between a medium level and a large level. It has an arc-shaped input / output characteristic and the dynamic range is compressed.

The output signal S _RD from the compression circuit 10 is
After passing through a recording amplifier circuit (not shown) or the like and being combined with the luminance signal subjected to the processing such as frequency modulation, it is supplied to the magnetic head and the recording operation is performed.

By the way, a concrete circuit configuration of the compression circuit 10 is as shown in FIG. 3, for example. That is, the peak hold circuit 20 includes the transistor 2
1, a capacitor 22 and a resistor 23, a low pass filter 30 is composed of a resistor 31 and a capacitor 32, the voltage control amplifier circuit 40 is composed of a field effect transistor 41, a transistor 42, a variable resistor 43 and the like, The limiter circuit 50 includes diodes 51 and 5
2. Consists of a capacitor 53. And the signal S _RC
Is supplied to the base of the transistor 42 whose emitter is grounded, and the signal S _RB is supplied to the base of the transistor 21 of the emitter follower. Then, the gain of the transistor 42 is changed according to the level of the signal S _RB , the signal S _RC is amplified by the transistor 42, and finally the dynamic range is compressed through the limiter circuit 50 to obtain the signal S _RD. The signal is output from the signal output terminal 13.

Next, the processing system of the reproduction carrier color signal at the time of signal reproduction in the video tape recorder of this embodiment will be described with reference to FIG. The signal reproduced by the magnetic head is separated into a reproduction luminance signal and a reproduction low-frequency carrier color signal, and this reproduction low-frequency carrier color signal _SPA is signal input terminal 61.
That is, it is supplied to the low-pass filter 62. The signal output from the low-pass filter 62 is sent to the ACC amplifying circuit 63, amplified, and then sent to the frequency converting circuit 64 to convert the carrier frequency from 688 kHz to 3.58 MHz. The converted signal is a burst de-emphasis circuit 6
At 5, only the burst signal b included in the signal is attenuated by a predetermined amount and output from the signal output terminal 66 as the reproduction carrier color signal S _PB . The signal S _PB is also supplied to the burst gate circuit 67.
Then, only the burst signal b included in the signal S _PB is taken out. Then, the burst signal b is detected as a continuous wave of 3.58 MHz by the ACC detection circuit 68, a DC voltage proportional to the level of the burst signal b is sent to the ACC amplification circuit 63, and the gain of the ACC amplification circuit 63 is increased. Be changed. That is, the above-described ACC feedback loop is formed here, and the low-pass filter 62 is set so that the level of the burst signal b included in the reproduction carrier color signal S _PB output from the burst de-emphasis circuit 65 is always constant. The reproduced low-frequency carrier color signal S _PA supplied via the signal is amplified by the ACC amplifier circuit 63. After all, this processing system can perform the expansion processing corresponding to the compression operation of the compression circuit 10 described above, without using a special expansion circuit.

The reproduction carrier color signal S _PB output from the burst de-emphasis circuit 65 passes through a video amplifier circuit (not shown) and is then combined with a reproduction luminance signal subjected to demodulation and the like to form a reproduction video signal. can get.

Next, the operation of the video tape recorder of this embodiment will be specifically described. The burst signal is included in the carrier color signal, but here, for convenience, the carrier color signal is divided into the burst signal b and the color signal c for description.

At the time of signal recording, for example, it is assumed that the carrier color signal S _{RA of the} maximum level as shown in A of FIG. 5 is supplied to the signal input terminal 1. In this case, the AC
The signal S _RB output from the C amplifier circuit 2 also _{reaches the} maximum level, and the gain of the voltage control amplifier circuit 40 is 0 dB, for example.
Becomes Therefore, the compression operation by the compression circuit 10 is not performed, and the signal S output from the signal output terminal 13 is output.
_As shown in FIG. 5B, _RD is the burst emphasis circuit 3 which emphasizes only the burst signal b by a predetermined amount.

Then, at the time of signal reproduction, a reproduction low-frequency carrier color signal S _PA similar to the signal S _RD shown in FIG. 5B above.
Is supplied to the signal input terminal 61, the reproduced carrier color signal S _PB output from the signal output terminal 66 is amplified by the ACC amplifier circuit 63 as shown in C of FIG. At the same time, the burst de-emphasis circuit 65 attenuates only the burst signal b by a predetermined amount.

Further, at the time of signal recording, the carrier color signal S of a small level as shown in A of FIG. 6 is applied to the signal input terminal 1.
_{If RA} is supplied, the gain of the voltage control amplifier circuit 40 is set to a predetermined value according to the level of the signal S _RB output from the ACC amplifier circuit 2. Therefore, the signal S _RD output from the signal output terminal 13 is, for example, as shown in FIG.
As shown in B of FIG. 3, the burst emphasis circuit 3 emphasizes only the burst signal b by a predetermined amount, and
The entire signal is amplified by the compression circuit 10, and the compression operation is performed.

Then, at the time of signal reproduction, a reproduction low-frequency carrier color signal S _PA similar in shape to the signal S _RD shown in FIG. 6B above.
Is supplied to the signal input terminal 61, the reproduction carrier color signal S _PB output from the signal output terminal 66 is amplified by the ACC amplifier circuit 63 as shown in C of FIG. At the same time, the burst de-emphasis circuit 65 attenuates only the burst signal b by a predetermined amount. At this time, the level of the color signal c is the above-mentioned compression circuit 1
Since the gain is increased by 0 at the time of recording, the gain of the ACC amplifying circuit 63 for obtaining the required level can be small, and thus the standing noise is not greatly amplified. Therefore, the S / N ratio of the reproduced reproduction color signal S _PB that is output is good and does not deteriorate as in the conventional case.

As described above, in the video tape recorder of this embodiment, the frequency conversion circuit 6 is used at the time of signal recording.
The carrier color signal S _RA that has been low-frequency converted by the low-frequency carrier color signal S _{RC, that} is, the low-frequency carrier color signal S _RC, is amplified by the voltage control amplifier circuit 40 in the compression circuit 10 with a gain corresponding to the level of the signal S _RB before conversion and is dynamically The range is compressed. As a result, the recording current supplied to the magnetic head is increased as compared with the conventional case, especially when the carrier color signal S _RA is at a low level to a medium level. Also, during signal reproduction, the reproduced low-frequency carrier color signal S _PA is the burst signal b included in the signal S _PA.
The dynamic range is expanded by the ACC amplifier circuit 63 with a gain based on the level of, and the original frequency is converted by the frequency conversion circuit 64.

That is, by performing the compression / expansion operation of the dynamic range, it is possible to improve the S / N ratio of the reproduction carrier color signal S _PB output from the signal output terminal 66 during signal reproduction. This is particularly effective when the carrier color signal S _RA supplied to the signal input terminal 1 at the time of signal recording is at a low level.

Further, the compression operation can be easily realized by the compression circuit 10 having a relatively simple structure as shown in FIG. 3, and the expansion operation can be performed without any special expansion circuit. Can be performed with the processing system of, and the advantage is very large.

[0029]

In the color signal recording circuit according to the present invention, the carrier color signal level control means detects the burst signal in the carrier color signal to be recorded, and the reproduction carrier is performed with a gain corresponding to the level of the burst signal. After the color signal is amplified and the level of the burst signal is made constant, only a predetermined amount of the burst signal in the carrier color signal is amplified by the burst emphasis means, and the carrier frequency of the carrier color signal is lowered by the frequency conversion means. Since it is converted to, the S / N of the burst signal can be secured. Further, the maximum value of the carrier color signal output from the carrier color signal level control means is detected by the maximum value detecting means, and a control signal corresponding to this maximum value is supplied to the gain control amplifying means via the time constant means. Then, the gain of the gain control amplification means is controlled by the control signal. The gain control amplifying means amplifies the low-range converted carrier color signal of low level to medium level with a large gain, and the low-range converted carrier color signal of medium level to large level with a small gain. The dynamic range of the low-frequency conversion carrier color signal can be compressed in the state where the S / N is secured.

Further, in the color signal recording / reproducing apparatus according to the present invention, the carrier color signal level control means detects the burst signal in the carrier color signal to be recorded, and reproduces it with a gain corresponding to the level of the burst signal. After the carrier color signal is amplified and the level of the burst signal is made constant, the burst emphasis means amplifies only the burst signal in the carrier color signal by a predetermined amount, and further the frequency conversion means lowers the carrier frequency of the carrier color signal. Since the signal is converted into the range, the S / N of the burst signal can be secured. Further, the maximum value of the carrier color signal output from the carrier color signal level control means is detected by the maximum value detecting means, and a control signal corresponding to this maximum value is supplied to the gain control amplifying means via the time constant means. Then, the gain of the gain control amplification means is controlled by the control signal. Further, the gain control amplifying means amplifies the low-range converted carrier color signal of a small level to a medium level with a large gain,
The low-range carrier color signal of medium to large level is amplified with a small gain. The recording means records the low-frequency conversion carrier color signal supplied from the gain control amplification means on the recording medium together with the separately processed luminance signal, so that the S / N of the burst signal is ensured in the recording system. In this state, it is possible to perform recording in which the dynamic range of the low-frequency conversion carrier color signal is compressed. Further, the reproduction low-frequency conversion carrier color signal level control means to which the reproduction low-frequency conversion carrier color signal separated from the reproduction signal obtained by reproducing the signal recorded by the recording means from the recording medium by the reproduction means is provided. , The reproduction low frequency conversion carrier color signal is amplified so that the level of the burst signal in the reproduced carrier color signal supplied from the burst de-emphasis means is detected and the level of the burst signal becomes constant. The dynamic range of the low-frequency conversion carrier color signal compressed in the system can be expanded and restored. As a result, the recording current of the low-level low-frequency conversion carrier color signal in the recording system is increased, so that the deterioration of the S / N ratio can be prevented. The frequency conversion means converts the low frequency conversion carrier frequency of the reproduction low frequency conversion carrier color signal level control means supplied from the reproduction low frequency conversion carrier color signal level control means to the original carrier frequency, and the burst de-emphasis means The level of the burst signal in the reproduced carrier color signal supplied from the frequency conversion means is attenuated by a predetermined amount. Further, the time constant means limits the response speed of the gain control amplification means within the response speed of the reproduction low frequency conversion carrier color signal level control means, so that the dynamic range of the low frequency conversion carrier color signal in the reproduction system is limited. The extension process can be performed reliably.

[0031]

[Brief description of drawings]

FIG. 1 is a block diagram showing a processing system of a carrier color signal at the time of signal recording in a video tape recorder of one embodiment to which the present invention is applied.

FIG. 2 is a characteristic diagram showing input / output characteristics of the processing system shown in FIG.

FIG. 3 is a circuit diagram showing a specific circuit configuration of a compression circuit in the processing system shown in FIG.

FIG. 4 is a block diagram showing a processing system of reproduced carrier color signals at the time of signal reproduction in the video tape recorder of the embodiment.

FIG. 5 is a waveform diagram schematically showing a carrier color signal for explaining the operation of each processing system during signal recording.

FIG. 6 is a waveform diagram schematically showing a carrier color signal for explaining the operation of each processing system during signal reproduction.

[Explanation of symbols]

 2 ... ACC amplification circuit 5 ... ACC detection circuit 6 ... Frequency conversion circuit 10 ... Compression circuit 20 ... Peak hold circuit 30 ... Low pass filter 40 ... Voltage control amplification circuit 63. .... ACC amplification circuit 64 ... Frequency conversion circuit 65 ... Burst de-emphasis circuit 68 ... ACC detection circuit

Claims (2)

[Claims] 1. A carrier color signal for detecting a burst signal in a carrier color signal to be recorded, amplifying the reproduced carrier color signal with a gain according to the level of the burst signal, and making the level of the burst signal constant. Level control means, a burst emphasis means for amplifying only a burst signal in the carrier color signal output from the carrier color signal level control means by a predetermined amount, and a carrier frequency of the carrier color signal supplied from the burst emphasis means to a low level. Frequency conversion means for converting into a range, maximum value detection means for detecting a maximum value of the carrier color signal output from the carrier color signal level control means, and outputting a control signal according to the maximum value, and the maximum value The gain is controlled according to the time constant means supplied with the control signal from the detection means and the control signal supplied from the maximum value detection means via the time constant means. A gain control amplifying means for amplifying the low frequency conversion carrier color signal supplied from the frequency converting means, and a low level to medium level low frequency conversion carrier color signal are amplified with a large gain by the gain control amplification means, A color signal recording circuit characterized by amplifying a low-frequency conversion carrier color signal of medium level to high level with a small gain. 2. A carrier color signal for detecting a burst signal in a carrier color signal to be recorded, amplifying the reproduced carrier color signal with a gain according to the level of the burst signal, and making the level of the burst signal constant. Level control means, a burst emphasis means for amplifying only a burst signal in the carrier color signal output from the carrier color signal level control means by a predetermined amount, and a carrier frequency of the carrier color signal supplied from the burst emphasis means to a low level. Frequency conversion means for converting into a range, maximum value detection means for detecting a maximum value of the carrier color signal output from the carrier color signal level control means, and outputting a control signal according to the maximum value, and the maximum value The detection means supplies the control signal to the time constant means, the frequency conversion means supplies the low-frequency conversion carrier color signal, and the maximum value detection means outputs an upper signal. The gain is controlled according to the control signal supplied through the time constant means, the low-level conversion carrier color signal of low level to medium level is amplified with a large gain, and the low-level conversion carrier color of medium level to high level is converted. A gain control amplifying means for amplifying the signal with a small gain; a recording means for recording the low-frequency conversion carrier color signal supplied from the gain control amplifying means on a recording medium together with a separately processed luminance signal, and the recording means. Reproducing means for reproducing the recorded signal from the recording medium; reproducing low-pass conversion carrier color signal level control means for supplying a reproducing low-pass conversion carrier color signal separated from the reproduced signal by the reproducing means; Reproduction supplied from the band conversion carrier color signal level control unit. Frequency conversion unit for converting the low band conversion carrier frequency of the low band conversion carrier color signal to the original carrier frequency, and the reproduction supplied from the frequency conversion unit. And a burst de-emphasis means for attenuating the level of the burst signal in the carrier color signal by a predetermined amount, wherein the reproduction low-pass conversion carrier color signal level control means is a unit for reproducing the carrier color signal supplied from the burst de-emphasis means. The level of the burst signal is detected, the reproduced low frequency conversion carrier color signal is amplified so that the level of the burst signal becomes constant, and the response speed of the gain control amplification means is adjusted by the time constant means to the reproduction low level. A color signal recording / reproducing device characterized in that the color signal recording / reproducing device is limited within the response speed of the area conversion carrier color signal level control means.