JPS58204692A - Chrominance signal processing circuit of magnetic recorder and reproducer - Google Patents

Abstract

PURPOSE:To improve the noise resistance characteristic for the recording and reproduction of signals of the NTSC and the PAL systems, by providing the 1st - the 3rd switching circuit so as to change over the input of the 1st frequency converting circuit to an output of the 1st and the 2nd VCO. CONSTITUTION:The oscillating frequency of the 1st voltage controlled crystal oscillating circuit VCO13 and the frequency being an integral multiple of a horizontal synchronizing signal from a terminal 10 are mixed at the 1st frequency converting circuit 3, and the converting frequency of the circuit 3 and the frequency of a recording and reproducing chrominance signa from a chrominance signal input terminal 2 are mixed at the 2nd frequency converting circuit 2. The signals from the circuit 2 and the terminal 1 are switched at the 1st switching circuit 14 and applied to the 1st and the 2nd phase detecting circuit 4, 6, and the phase of the output of the circuit 14 and the oscillating frequency of the 2nd VCO is compared at the circuit 4. The 2nd and the 3rd switching circuits 15, 16 are provided between the circuit 4 and the VCO9 and between the VCO9 and the circuit 3 respectively, the outputs of the VCOs 9 and 13 are switched with the output of the circuit 4 for the NTSC and the PAL systems and applied to the circuit 3 as a control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of a color signal processing circuit for a magnetic recording/reproducing apparatus (hereinafter referred to as rVTRJ), and particularly relates to an improvement in a color signal processing circuit for a magnetic recording/reproducing apparatus (hereinafter referred to as rVTRJ), and in particular for an NTOTSG color television signal (hereinafter referred to as rNTsc color signal) and a PAL system. The present invention relates to an improvement in a color signal processing circuit that can be applied to a color television signal (hereinafter referred to as rPAL color signal j).

A conventional color signal processing circuit for a VTR is shown in FIG. First, the configuration and operation of a conventional color signal processing circuit will be explained with reference to FIG.

The color signal processing circuit includes a second frequency conversion circuit that converts the frequency of the color signal inputted from the color signal input terminal 1 into a low frequency or high frequency frequency based on the frequency inputted from the first frequency conversion circuit 3; A first phase detection circuit 4 compares the phases of the output frequency of the frequency conversion circuit 2 and the output frequency of the crystal oscillation circuit 5 and generates an error voltage commensurate with the phase difference, the output of the second frequency conversion circuit 2 and the crystal. A second phase detection circuit 6, which compares the phase of the output of the oscillation circuit 5 with the output whose phase has shifted by 90 degrees by passing it through the phase shift circuit 7, and generates a phase voltage commensurate with the phase difference; recording and reproducing; open and close in response to
The oscillator circuit 8 includes a switch circuit 8, and an electrically controlled crystal oscillator circuit 9 whose oscillation frequency changes depending on the output error voltage of the first phase detection output. And input terminal 10
is a frequency nf, MH2, which is an integral multiple of the frequency of the horizontal synchronizing signal (hereinafter referred to as rf, J), is applied to the first frequency conversion circuit 3.
(0 is a positive integer) is applied, the output of the second frequency conversion circuit 2 appears at the output terminal 11, and the detection output of the second phase detection circuit 6 appears at the output terminal 12. There is.

Note that the frequency nfHMH2 is normally selected to be n=40 in the case of a VH3 type VTR, so the following description will be made assuming that n=40.

Next, the operation of this color signal processing circuit will be explained in the case of an NTSC color signal and the case of a PAL color signal.

First, when recording an NTSC color signal, the switch circuit 8 is opened by a signal that distinguishes between recording and reproduction (not shown), so the voltage controlled crystal oscillation circuit 91. : The output error voltage from the first phase detection circuit 4 is not applied, and the voltage-controlled crystal oscillation circuit 9 operates as an oscillation circuit with an accurate fixed frequency of 3°58 MHz, which is the color subcarrier frequency of the NTSC color signal. A signal with a fixed frequency of 3.58 MHz is applied to the first frequency conversion circuit 3 from one input terminal.

Input terminals 10, 113X, etc. of the first frequency conversion circuit 3
．． 1. The aforementioned 40fHMHz signal is input, and the 3.58MHz signal from the voltage controlled crystal oscillator circuit 9 and the 40f
It is the signal component of the sum of HMHz (3.58+40fn
)MHz signal is output from the first frequency conversion circuit 3 and input to one input terminal of the second frequency conversion circuit 2.

Also, since it is during recording, the second frequency conversion circuit 2
3.58M of NTSC color signal from color signal input terminal 1
A Hz recording conveyance color signal is input, and this recording conveyance color signal is converted to (3,58+) from the first frequency conversion circuit 3.
40fH) is mixed with the signal of MH2, and by taking the difference, it is converted to a lower frequency and output from the output terminal 11 as a low frequency recording conveyance color signal 40fHMH2. At this time, the oscillation operation of the crystal oscillation circuit 5 is stopped by a signal that distinguishes between recording and reproduction (not shown), and the oscillation operation of the crystal oscillation circuit 5 is stopped, and the first phase detection circuit 4. The second phase detection circuit 6 and phase shift circuit 7 also do not operate.

Next, when reproducing the \TSC color signal, the second frequency conversion circuit 2. First phase detection circuit 4. Crystal excavation circuit 5.
Switch circuit 8. The voltage controlled crystal oscillation circuit 9 and the first frequency conversion circuit 3 constitute an automatic phase control 0 (hereinafter referred to as rApc) loop.

In other words, voltage! The control crystal output circuit is N T S C
It oscillates at 3.58 MHz, which is the color subcarrier frequency of the color signal, and the oscillation frequency is applied to the first frequency conversion circuit 3 from one input terminal. A signal of 4Of and MH2 is applied to the first frequency conversion circuit 3 from another input terminal 10, and these two input signals are mixed in the first frequency conversion circuit 3 to produce a signal that is the sum of both signals. It is a component (3
．． It becomes an output signal of 58+4 Or, >MHz, and is applied from one input terminal of the second frequency conversion circuit 2. Since this is during reproduction, the second frequency conversion circuit 2 receives the recording reproduced from, for example, a magnetic tape from the color signal input terminal 1, and a reproduction low-frequency conversion signal containing the time axis fluctuation component ±ΔfM)-1z associated with reproduction. A carrier color signal (40r ± Δf) MH2 is applied, and these two signals are mixed in the second frequency conversion circuit 2, and the difference between the two signals is (3.58K Δf) M
The H2 signal is output from the output terminal. Furthermore, this output signal is applied to the first phase detection circuit 4 and the second phase detection circuit 6 through one input terminal f'X of each. A fixed frequency signal of 3.58 MHz from the crystal oscillation circuit 5 is applied to the first phase detection circuit 4 from the other input terminal, and this 3.58 MHz fixed frequency and the second frequency conversion circuit 2 (3,58 嬬Δf)
An error voltage corresponding to the phase difference with the signal of Ml-1z is generated, and voltage-controlled crystal oscillation is performed via a switch circuit 8 (not shown) which is closed during playback by a signal that distinguishes between recording and playback. An error voltage is applied to the circuit 9. The voltage controlled crystal oscillation circuit 9 operates according to the applied error voltage (3°58
The signal is shot at a frequency of ±Δr) MHz and is input to the first frequency conversion circuit 3. Then, this signal and the 4Of1.1 MH2 signal from the input terminal 10 are converted into (3,5B+4Of H±Δ) in the first frequency conversion circuit 3.
f) Frequency converted to MH2, second frequency conversion circuit 2
3,58M)-1 from which the time axis fluctuation component, which is the difference from the reproduced low-frequency conversion carrier color signal (40f1.I±Δr)Ml-17, is removed in the second frequency conversion circuit 2.
The z signal is output.

As explained above, in the APC loop, the phase difference between the output signal from the second frequency conversion circuit 2 and the output signal from the crystal oscillation circuit 5, which are applied to the first phase detection circuit 4, is The output frequency of the crystal oscillation circuit 5 is a fixed frequency of 3.58 MHz, so the output frequency of the second frequency conversion circuit 2 is 3.58 MHz.
It becomes constant at MHz. In other words, the time axis fluctuation component associated with recording and reproduction contained in the reproduced low-pass converted carrier color signal input to the second frequency conversion circuit 2 is removed.

Also, while the APC loop is operating, the first frequency conversion circuit 2
The output signal of the crystal oscillator circuit 5 and the output signal of the crystal oscillation circuit 5 are always 901
Therefore, the output signal of the crystal oscillation circuit 5 is changed in phase by 90 degrees via the phase shift circuit 7 and applied to the second phase detection circuit 6 from one input terminal, and the output signal from the other input terminal is applied to the second phase detection circuit 6 from one input terminal. When phase detection is performed with the output signal of the second frequency conversion circuit 2 input to the second phase detection circuit 6, in the case of a color signal, the phase between the two signals input to the second phase detection circuit 6 is detected. The phase difference becomes zero, and 1O-J (or "
When the reproduced signal is a black and white signal, the phase difference between the two signals input to the second phase detection circuit 6 becomes irregular, so the reference voltage A voltage that is "high j" (or "low") is output to the output terminal 12. Therefore, the "high" and "low" voltages output to the output terminal 12 are compared with the reference voltage, and the phase is determined to have a sign of excellent noise resistance, such as applying a color killer when black and white. The detected waveform color killer signal rJA process can be performed.

Next, the case of color signal recording and reproduction of PAL color signals will be explained.

Record PAL color signals with ~'H5 system VTR.

During playback, due to the third-order distortion of the VTR's electromagnetic conversion system, the F x of the luminance signal is
l A beat component occurs in M key. Therefore, in order to visually reduce this beat component, the V of the PAL color signal is
The H3 system VTR low-pass conversion subcarrier frequency is (40+1
/8) f HMHz is selected.

First, when recording a PAL color signal, an NT (not shown)
The crystal oscillated by the voltage-controlled crystal oscillation circuit 9 is switched by the SC-PAL operation switching signal, and the voltage-controlled crystal oscillation circuit 9 operates at a fixed frequency of (4,433+ (1/'8)fn) MHz (4,4331Vll is PAL The oscillation signal of the voltage-controlled crystal oscillation circuit 9 and the 40 fs MH2 signal applied from the input terminal 10 are mixed in the first frequency conversion circuit 3 (color subcarrier frequency of the color signal), and the two signals are The signal of the sum of the cape (4,433 + 40
r 1ITl:i /'8)f h ) MHz is output and applied to the second frequency conversion circuit 2.a In the second frequency conversion circuit 2, the signal input from the first frequency conversion circuit 3 and , PA input from color signal input terminal 1
The L color signal and the 4.433MHz recording transport color signal are mixed, and the difference component between the two signals is 'b (40+1/
8) The f HMHz signal becomes a 1fi recording low frequency conversion transport color signal. Since this is the time of recording, APC does not operate as in the case of the NTSC color signal.

When reproducing a PAL color signal, the crystal oscillator circuit 5 is switched by an NTSC-PAL operation switching signal (not shown), and the crystal oscillation circuit 5 is switched to 4, 43, which is the color subcarrier frequency of the PAL color signal.
Oscillates at a fixed frequency of 3MH2, voltage i+lJ III
Since the crystal oscillation circuit 9 is a PAL color signal, as described above, (4,433+(1/'8)f s )MH2
oscillates. (4, 43
3+ <1/8> fn) MHz oscillation output is the signal component of the sum of the 40f tuna 1 signal input from the input terminal 10 in the first frequency conversion circuit 3 (4.433+40f
s + (1/8) f s ) MHz (7) signal is applied to the second frequency conversion circuit 2 . At the same time, the second frequency conversion circuit 2 receives from the color signal input terminal 1 a PA containing a time axis fluctuation component ±ΔfMH2 accompanying recording and reproduction.
Reproduction of L color signal Low frequency conversion carrier color signal (40r H+
(1/8)fH±Δf')MHz is input, and the second
From the frequency conversion circuit 2 of (4°433+4Of, + (
The difference from 1/8) fH) MHz is (4.433〒Δf
)MHz reproduced carrier color signal is output. This reproduced carrier color signal is applied to the first phase detection circuit 4 and the second phase detection circuit 6 from one input terminal, respectively. A crystal oscillation circuit 5 is connected to the other input terminal of the first phase detection circuit 4.
A signal with a fixed frequency of 4.433 MHz is applied. Then, from this first phase detection circuit 4, the input 2
An error voltage according to the phase difference between the two signals is output, and the error I! The controller controls the voltage controlled crystal oscillation circuit 9 via the switch circuit 8, and the voltage controlled crystal oscillation circuit 9 controls the time axis fluctuation component ±ΔfMHI! including (4,433+ (1/8)f
It outputs a signal with a frequency of lI±Δf) MHz. The above-mentioned N-
This is similar to the operation of the PC loop when reproducing the rsc color signal, and can perform color killer of the phase detection circuit.

Since the color signal processing circuit of a conventional VTR is configured as described above, when recording NTSC color signals and PAL color signals, C does not constitute an APC loop.
One disadvantage is that it is not possible to use a one-sided color waveform.One additional drawback is that since an APC loop is not formed during recording, time axis fluctuation components that occur during recording, such as when dubbing to a VTR, are removed. I couldn't even do that.

Therefore, it is an object of the present invention to eliminate the drawbacks of the conventional circuits as described above.

Simply put, this invention is based on NTSC color signals,
It is an object of the present invention to provide a color signal processing circuit which is improved so as to be able to record color signals of both PAL color signals and perform a single phase detection type color killer operation by configuring an APC loop.

Hereinafter, this invention will be explained in more detail based on an embodiment shown in FIG.

In FIG. 2, circuits with the same numbers as in FIG. 1 are the same as or correspond to conventional color signal processing circuits. The feature of the embodiment shown in FIG. 2 is that the second voltage-controlled crystal oscillation circuit 13, which functions as a voltage-controlled crystal oscillation circuit during recording and as a fixed-frequency crystal oscillation circuit during playback, is the same as the crystal oscillation circuit shown in FIG. What was prepared in place of 5, records and
It is connected to the playback signal input terminal 1 and the output terminal of the second frequency conversion circuit 2, and is switched depending on recording and playback. 2 is provided with a first switching circuit 14 that transmits the frequency-converted playback signal to the next stage, and the output from the first phase detection circuit 4 is transferred to the second voltage control circuit 1 during recording. A second switching circuit 15 is provided which switches the transmission path according to recording and reproduction so that the voltage is transmitted to the first voltage-controlled crystal oscillation circuit 9 to control the oscillation circuit during reproduction. and ＼T
When recording one SC color word, apply the second voltage - the output of the Jiil crystal initiation circuit 13 to the first frequency conversion circuit 3,
During reproduction of NTSC color No. 13 and PAL color signal recording and reproduction, the output of the first voltage-controlled crystal oscillator circuit 9 is applied to the first frequency conversion circuit 3.
The switching circuit 16 is provided.

Next, the operation of this circuit will be explained. , when recording an NTSC color signal, the first switching circuit 14 distinguishes between recording and reproduction (not shown); it is connected to the color signal input terminal 1 side as shown in the figure. The second switching circuit also uses a signal to distinguish between recording and reproduction.
As shown in the figure, it is connected to the input terminal side of the second voltage-controlled crystal excavation circuit 13. Furthermore, the third switching circuit 16
Again, by a signal that distinguishes between recording and playback (not shown):
. .:'.,'' is connected to the output terminal side of the second voltage controlled crystal oscillation circuit 13. In the circuit shown in this figure, the first phase detection circuit 4, the second switching circuit 15 and the second voltage controlled crystal oscillator circuit form an APC loop W4.In other words, the first phase detection circuit 4 receives the input signal from the color signal input terminal via the first switching circuit 14. A distortion difference voltage commensurate with the phase difference between the recording conveyance color signal and the output of the second voltage-controlled crystal oscillation circuit 13 is output from the output terminal, and the output is converted to the second voltage via the second switching circuit 15. υIIjIl is input to the crystal oscillation circuit 13, and the second voltage-controlled crystal oscillation circuit controlled by this error voltage output] 3 and the recording/fading signal input from the color signal input terminal 1. 901!i is a constant phase difference.

Next, time axis fluctuation @ minutes was included due to dubbing between VTRs, etc. 1-. Recording transport color signal of T S C color signal
, the first phase detection circuit 4 generates an error voltage, and the error voltage acts on the second voltage-controlled crystal oscillation circuit 13 to generate the second voltage-controlled crystal oscillation circuit 13.
The oscillation of the crystal oscillation circuit 13 is controlled so that the wave number is (C, 082Δc) to 11]Z. The output of the (3,58±Δf) MHz voltage-controlled crystal oscillation circuit 13 is connected to the first switching circuit 16 via the third switching circuit 16.
is applied to the frequency conversion circuit J, and the first frequency conversion circuit 3 receives a signal component of the sum of the 40fhMH2 signal input from the input terminal 10 and this (3°58±Δf) MHz (3°58+40f n Δf) MHz signal to the second
is applied to the frequency conversion circuit 2. The second frequency conversion circuit 2 receives a color signal from the input terminal 1 (3°581Δ
f) Difference component between the MHz signal and the <3.58+40f s±△f) MHz signal applied from the first frequency conversion circuit 3 40fHMHz with a certain time axis fluctuation removed
Outputs a low frequency converted carrier color signal. As a result, V'T
The time axis fluctuation component due to dubbing between R and the like is removed.

Also, during recording, as described above, the first phase detection circuit 4.
5 and the second voltage-controlled crystal oscillator circuit 13 to form an APC loop, the color signal is input from the color signal input terminal l to the first phase detection circuit 4 and the second phase detection circuit 6. 8 recording fading signal and the second voltage i+11
The output of the m crystal oscillation circuit 13 is always 90I! It arrives at a constant phase of 1. Therefore, this second phase controlled crystal oscillation circuit 1
The output of No. 3 is changed in phase by 90 degrees through phase shift circuit 7, and
It is sufficient if the recording carrier color is inputted to the detection circuit 6 of 1 and subjected to phase and wave detection based on the signal. When phase detection is performed, when the recording signal is a color signal, the 2 signal input to the second phase detection circuit 6 is
The phase difference between the two signals becomes zero, and when the recording signal is a monochrome signal, the phase difference between the two signals becomes irregular, so the output of the second phase detection circuit 6 differs between the color signal and the monochrome signal. .

Additionally, by comparing the output of the phase detection circuit 6 with the reference voltage, it is possible to perform phase detection type color killer signal processing such as removing the color killer when a monochrome signal is used.

When reproducing an NTSC color signal, the first switching circuit 14 is connected to the output side of the second frequency conversion circuit 2, and the second and third switching circuits 15 and 16 is connected to a first voltage controlled crystal oscillation circuit 911. Therefore, the second voltage controlled crystal oscillator circuit 13 functions as a fixed frequency oscillator circuit of 3.58 iVIHz, and the second voltage controlled crystal oscillator circuit 13 functions as a fixed frequency oscillator circuit of 3.58 iVIHz. In the example shown in No. 1, the movement is exactly the same as that when reproducing an NTSC color signal. Therefore, C
For details of the operation in case 2, please refer to the conventional example, so a description of the operation in this case will be omitted here.

Next, the case where the P, A, L 7J stroke numbers are recorded and reproduced will be explained. As mentioned above, V) AL color -
NTSC- (not shown) is used when recording and reproducing
The PAL operation switching signal causes the first input to the second 1. The first voltage controlled crystal oscillation circuit is (4,433+ (
1'8) j q ) M) → 2 , second chisel pressure J11all crystal silkworm i1J path *4.433M87
．． 7-1 Kuremizu's "Ko" is pronounced.

When recording a PAL color signal, the first loss circuit 14 and the second switching circuit 15 operate as follows.
As in the recording of the SC color signal, the first switching circuit 14 is connected to the color signal input terminal 1 side as shown in the figure, and the second switching circuit 15 is the second 11! Monarchy! 711 crystal oscillation circuit 1
Connected to 3 ropes. The third switching circuit 16 is always connected to the first voltage-controlled crystal oscillator circuit 9 in the case of a PAL color signal, and is never switched between recording and reproduction.

First phase detection circuit 4. The second switching circuit 15 and the second
The voltage controlled crystal oscillator circuit 13 constitutes an APC loop in the same way as when recording the NTSC color signal, and the second phase detection circuit 6. Phase shift circuit 7 and second 1! The crystal oscillation circuit 13 constitutes a phase detection color killer circuit.

Furthermore, since the second switching circuit 15 is connected to the input side of the second voltage 11Jtll crystal oscillation circuit 13, the first voltage controlled crystal oscillation circuit 9 is (4,433+(1,/8)
fP) Works in conjunction with the fixed frequency oscillation circuit of MH2.
Its output is applied to the first frequency conversion circuit 3 via the third switching circuit 16. In the first frequency conversion circuit, the output of the first voltage controlled crystal oscillation circuit 9 and the input terminal 10
The numbers of 40f and 1MH1 inputted are mixed,
The sum of these two signals is <4.433+
40f, go (”l,’8) io,
In 8 zl Hz 1 ri i (minister i ga Li' 2 ri f() in mute), - ri, the second frequency conversion circuit 2 ~ sign +j + J and 63 second frequency conversion circuit 2: yo, (4,433=40I N F(
1/'8/:'il) M, -12D signal 4 G, color is manually input from signal input Hanako 1 to L Cassie signal 4° 433 ~ IH2 recording shifting color; with Δ The difference signal is (40-1,,/8) f,
+v1)-12 low frequency conversion carrier color signal is output.

j5, this first frequency conversion circuit 3 inputs to the second frequency conversion circuit 2 1'<4.433+40f s
+ (1ioB) f s ”; MH2'7)m
Because the number Si is fixed, unlike when recording an N - + -S C signal, in PAL color signal recording/R, when dubbing between VTRs, etc. It is not possible to remove the time axis fluctuation component of the soil.

Next, when reproducing the PAL color signal, similarly to when reproducing the TSC color signal, the first switching circuit 14 and the second
Since the switching circuits 15 are respectively switched and connected to the opposite side (two
,433,' r1/”8) f s ) Lzi l-I
Z voltage - works as a noll crystal oscillation circuit, and the second voltage controlled crystal oscillation circuit 13 works as a fixed frequency oscillation circuit of 4.433MH2.1. Therefore, the circuit configuration is exactly the same as that of the conventional example for reproducing PAL color signals, and the operation is also the same, so the letter T will be omitted in this explanation.

As described above, according to the present invention, in any state of recording and reproducing NTS C color signals and MEPAI color signals, color killers can be used as phase S waveform color killers with excellent noise resistance characteristics. This has the effect that it is possible to do this.

Furthermore, excluding the time of recording the PML color signal.

)5 In other operating states, people...? Even if the time axis fluctuation component is included in the carrier color signal), there is also the effect that the change component can be removed from ρC (,:).

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional color signal processing circuit. FIG. 2 is a circuit diagram of a color signal processing circuit according to an embodiment of the present invention. In the figure, the same numerals indicate the same or bill part, 1
2 is a color signal input terminal, 2 is a second frequency conversion circuit, 3 is a first frequency conversion circuit, 4 is a first phase detection circuit, 6 is a second phase detection circuit, 7 is a phase shift circuit, 9. 13 is a voltage controlled crystal oscillator circuit, 14 is a first switching circuit, 15 is a second switching circuit, and 16 is a third switching circuit. Mo, J,? Ichi Tadashi 2↑ (self-motivated) 1981 1i Yu 16th day 1 "+'u'l'11' I 'self-dono 1
, 'If f';-; ,! , 71 Mi Patent Application No. 57-89052 2, November 3 Explanation column and Figure 2 6 of the drawings, contents of correction (1) “Second frequency conversion circuit” in line 8 of page 4 of the specification is corrected to “second frequency conversion circuit 2”. (2 > Correct “phase voltage” in lines 14 to 15 of page 4 of the specification to “error voltage”. (3) Change “input terminal 10” to “input terminal 10” in line 19 of page 4 of specification. (4) Amend “selected” in line 7 of page 5 of the specification to “selected”. (5) Paragraph 18 of member 9 of the specification Set the "first frequency" of the row to 1
the second frequency. (6) Correct "color signal input terminal" in the third line of page 17 of the specification to "color signal input terminal 1". (7) In the 18th page, line 12 of the specification, "There is a component of the signal difference." is corrected to "There is a component of the signal difference." (8) Set the "Record transport color" on page 23, line 16 of the specification to 1.
Correct to "recording and playback transport color". (9) Figure 2 will be amended as shown in the attached sheet. That's all ■ ( )

Claims (1)

[Claims] A first voltage-Jll1 oscillation circuit having a control voltage input terminal, and a control 1l11! second voltage 1i1J with press-fit terminal
III oscillation circuit, which mixes a frequency that is an integral multiple of the frequency of the horizontal synchronizing signal inputted from one input terminal and an oscillation frequency from the first voltage controlled oscillation circuit inputted from the other input terminal. A first frequency conversion circuit that generates a converted output frequency; and a conversion output of the first frequency conversion circuit that is input from the other input terminal to the recorded color signal and the reproduced color signal inputted from the recording/playback signal input terminal. a second frequency conversion circuit that converts the frequency of the recorded color signal and the reproduced color signal and outputs the frequency from the output terminal by mixing frequencies; and the recording/reproducing signal input terminal and the second frequency conversion circuit output. It is connected to a terminal and is switched between recording and playback according to Q, and transmits a recording signal whose frequency has not been converted during recording, and a playback signal whose frequency has been converted by the second frequency conversion circuit during playback to the next stage. A first recording/playback switching circuit, a signal transmitted through the first recording/playback switching circuit input from one input terminal, and the second voltage 1iIII control oscillation input from the other input terminal. a first phase detection circuit that compares and detects the phase with the oscillation frequency from the circuit; and transmitting the output from the first phase detection circuit to the control voltage input terminal of the second voltage controlled oscillation circuit during recording. a second recording/reproduction switching circuit that controls the oscillation circuit and, during reproduction, transmits the signal to the control voltage input terminal of the first voltage-controlled oscillation circuit to control the oscillation circuit, and switches the transmission path according to recording or reproduction; a phase shift circuit connected to the output of the second voltage controlled oscillation circuit; and a signal from the first recording/reproduction switching circuit and the second voltage controlled oscillation transmitted via the phase shift circuit. a second phase detection circuit that comparatively detects the phase with the R interlayer wave number from the circuit and outputs a phase detection output; The oscillation frequency of the second voltage ill II oscillation circuit controlled by the output voltage of the first phase detection circuit is replaced with the oscillation frequency of the first voltage controlled oscillation circuit. 1. A color signal processing circuit for a magnetic recording/reproducing device, comprising a third switching circuit for switching input to a conversion circuit.