JPH0728423B2 - Color television signal processor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Field of Use B Outline of the Invention C Conventional Technology D Problems to be Solved by the Invention E Means for Solving the Problems F Working G Examples of Circuit Configurations and Examples Related to the Invention G-1 Related to the Invention First circuit configuration example (Fig. 1) G-2 Second circuit configuration example (Fig. 2) related to the invention G-3 First embodiment (Fig. 3) G-4 Related to the invention Third circuit configuration example (Fig. 4) G-5 Second embodiment (Fig. 5) H Effect of the invention A Industrial field of application The present invention relates to a luminance signal and a color signal constituting a color video signal. The present invention relates to a color television signal processing device capable of obtaining a reproduced color image based on the above.

B Outline of the Invention The present invention provides a luminance signal circuit, a color signal circuit, an image table processing unit, and the like so that a reproduced color image can be obtained based on a luminance signal and a color signal forming a color video signal. In a color television signal processing device including the above, a composite video signal formed by combining a luminance signal and a color signal by an external device, or a luminance signal and a color signal separated from each other by the external device are supplied. The composite video signal from the external input terminal unit is provided with a connector unit provided with an external input terminal unit, and the composite video signal from the external input terminal unit is processed directly or in a predetermined manner, so that the luminance signal circuit and the color signal circuit The state of being supplied to each of them and the state of supplying the mutually separated luminance signal and color signal from the external input terminal section to the luminance signal circuit and the color signal circuit, respectively, are selectively taken. At the same time, when the composite video signal is supplied to the external input terminal section, the signal removing means removes the color signal forming the composite video signal from the composite video signal supplied to the activation signal circuit, or The signal separating means separates the composite video signal supplied to the external input terminal unit from the luminance signal and the color signal forming the composite video signal, which significantly increases the manufacturing cost and the like. In the case where a composite video signal formed by synthesizing a luminance signal and a color signal is supplied by an external device through the external input terminal section without causing the disadvantage of In any case where a color signal is supplied, a high quality reproduced color image can be obtained.

C Prior Art Generally, a magnetic recording / reproducing apparatus is used to record and reproduce a color video signal. Such recording and reproduction of a color video signal will be described with reference to FIG.

FIG. 6 shows the structure of the magnetic recording / reproducing apparatus.
This magnetic recording / reproducing apparatus has a recording system [I] and a reproducing system [II]. The recording system [I] includes an input terminal 1 to which a composite video signal is supplied as a color video signal, a low pass filter (LPF) 2, a band pass filter (BPF) 3, a pre-emphasis circuit 4, a frequency modulation circuit 5, an amplifier 6, It is configured to include a frequency conversion circuit 7, an amplifier 8, and a recording head 9, and
The reproduction system [II] includes a reproduction head 11, an amplifier 12, a high pass filter (HPF) 13, a low pass filter 14, a frequency demodulation circuit 15,
De-emphasis circuit 16, frequency conversion circuit 17, amplifier 18,
Also, the oscillator (OSC) 10 is configured to include the output terminal 19 and commonly used in the recording system [I] and the reproducing system [II].
Is provided. The magnetic tape 20 is used to record and reproduce the color video signal.

With such a configuration, the low-pass filter 2 and the band-pass filter 3 separate the luminance signal (Y signal) and the color signal (C signal) from the composite video signal supplied to the input terminal 1. The Y signal separated by the low-pass filter 2 is subjected to pre-emphasis processing for frequency modulation by a pre-emphasis circuit 4, and then a frequency modulation circuit 5 frequency-modulates a predetermined carrier signal to obtain a predetermined frequency band. The frequency-modulated Y signal obtained from the frequency modulation circuit 5 is supplied to the amplifier 6. On the other hand, the C signal separated by the bandpass filter 3 is a signal having a carrier frequency of 3.58 MHz, and is output from the oscillator 10.
Frequency conversion circuit 7 supplied with 4.27MHz oscillation output signal
Is converted into a low frequency band by C. and converted into a low frequency conversion C signal having a carrier frequency of 688 KHz, and the low frequency conversion C signal obtained from the frequency conversion circuit 7 is supplied to the amplifier 8. Then, the frequency-modulated Y signal and the low-frequency converted C signal obtained from the amplifiers 6 and 8 are mixed and recorded on the magnetic tape 20 by the recording head 9.

Further, the signal read from the magnetic tape 20 by the reproducing head 11 is supplied to the high-pass filter 13 and the low-pass filter 14 after passing through the amplifier 12, and the high-pass filter 13 extracts the frequency-modulated Y signal and the low-pass filter 14 The low frequency conversion C signal is taken out. The frequency-modulated Y signal from the high-pass filter 13 is demodulated in the frequency demodulation circuit 15, and the demodulated output is subjected to de-emphasis processing by the de-emphasis circuit 16 to reproduce the original Y signal. On the other hand, low-pass filter
The low-frequency converted C signal from 14 is frequency-converted in the frequency conversion circuit 17 to which the 4.27 MHz oscillation output signal from the oscillator 10 is supplied, thereby reproducing the original C signal having the carrier frequency of 3.58 MHz. It Reproduced Y signal and C
After the signals are mixed, they pass through the amplifier 18 and are output to the output terminal 19 as a composite video signal.

In this way, the composite video signal reproduced by the magnetic recording / reproducing apparatus is supplied to, for example, a color television receiver for image reproduction based on the composite video signal, and in the color television receiver, the cathode ray tube ( On the CRT, a color image based on the composite video signal reproduced by the magnetic recording / reproducing apparatus can be obtained in the same manner as in the case of a normal received color video signal.

When recording and reproducing a color video signal using the magnetic recording / reproducing apparatus as described above, the Y signal and C reproduced in the reproducing system [II] are suggested as indicated by the broken line in FIG. It has also been proposed that the signals be derived without being mixed and provided for color image reproduction based on them.

D Problem to be Solved by the Invention As described above, when the reproduced Y signal and C signal are used for image reproduction in a state where they are separated from each other, the reproduced Y signal and C signal are reproduced. The quality deterioration of the reproduced color image due to the signal processing such as the image synthesis and the separation performed thereafter is reduced, but the color image based on the mutually separated Y signal and C signal is reduced. There is an inconvenience that reproduction cannot be performed by a color television receiver which is conventionally used normally.

In view of such a point, the present invention provides a Y signal and a C by an external device.
In either case where a composite video signal formed by synthesizing a signal with each other is supplied and when a Y signal and a C signal are separately supplied from an external device and supplied, the supplied Y signal and C are supplied. It is an object of the present invention to provide a color television signal processing device capable of obtaining a high quality reproduced color image based on a signal and capable of performing its function with a relatively simple structure.

E Means for Solving the Problem In order to achieve the above object, the color television signal processing device according to the present invention, when brought into a mutual engagement state, synthesizes a Y signal and a C signal from an external device. And a composite video signal input terminal portion composed of a pair of connectors to which the composite video signal formed by the above is supplied, and the Y signal and the C signal, which are separated from each other, are supplied from an external device when they are engaged with each other. A Y / C separated video signal input terminal section consisting of a pair of connectors, and a Y signal constituting the composite video signal supplied to the composite video signal input terminal section, or a Y / C separated video signal input terminal section. A luminance signal circuit for performing signal processing on the Y signal and a C signal forming the composite video signal supplied to the composite video signal input terminal portion, or a signal for the C signal supplied to the Y / C separated video signal input terminal portion place Is provided between the color signal circuit for performing the above, the composite video signal input terminal portion and the Y / C separated video signal input terminal portion, and each of the luminance signal circuit and the color signal circuit, and is supplied to the composite video signal input terminal portion. The composite video signal is directly or subjected to predetermined processing and supplied to the luminance signal circuit, and the composite video signal supplied to the composite video signal input terminal portion is directly or subjected to predetermined processing to provide a color signal circuit. , And the Y / C separation processing mode in which the Y signal and the C signal supplied to the Y / C separated video signal input terminal are supplied to the luminance signal circuit and the color signal circuit, respectively. Signal switching means and a signal removing means for selectively taking a signal removal state for removing the C signal constituting the composite video signal supplied to the luminance signal circuit, or the composite video signal input The composite video signal supplied to the terminal section is provided with signal separation means for selectively separating a Y signal and a C signal forming the composite video signal and passing them through a signal switching means. By the engagement detection means provided in the separated video signal input terminal portion, which detects whether or not the pair of connectors forming the Y / C separated video signal input terminal portion are in the mutual engagement state, and the engagement detection means. When it is detected that the pair of connectors forming the Y / C separated structure signal input terminal portion are not in the mutually engaged state, the signal switching means is set to the composite processing mode and the signal removing means is in the signal removing state. Or switching control means for causing the signal separation means to take the signal separation state.

F operation In the color television signal processing device according to the present invention having such a configuration, it has a relatively simple configuration.
Therefore, a composite video signal formed by synthesizing the Y signal and the C signal by an external device is formed through the composite video signal input terminal portion without inconvenience such as a significant increase in the manufacturing cost thereof. When supplied and Y / C
In either case where the Y signal and the C signal separated from each other by the external device are supplied through the separated video signal input terminal portion, the Y signal output without the chrominance signal beat interference is obtained from the luminance signal circuit. As a result, an output that gives a reproduction color image of good quality is obtained from the image display processing unit. Therefore, for example, a color image reproduction and a magnetic recording reproduction based on a composite video signal derived from a magnetic recording reproduction apparatus. When used for color image reproduction based on the Y signal and the C signal which are derived from the device in a mutually separated state, a high quality is obtained based on the Y signal and the C signal reproduced by the magnetic recording / reproducing device. It is possible to obtain a reproduced image.

G Circuit Configuration Example and Examples Related to the Invention G-1 First Circuit Configuration Example Related to the Invention (FIG. 1) FIG. 1 is a circuit configuration forming a color television signal processing device related to the invention. The main part of an example is shown. In this example, input terminals 21 and 22 are provided, and these input terminals 21 and 22 are opened to the outside to form an external input terminal portion. Then, a composite video signal formed by combining the Y signal and the C signal by an external device or a Y signal of the Y signal and the C signal separated from each other by the external device is supplied to the input terminal 21. The C signal of the Y signal and the C signal separated from each other by the external device is supplied to the input terminal 22.

The input terminal 21 is connected via a buffer amplifier 23 to a luminance signal circuit 25 that processes Y signals, and
Via the buffer amplifier 23, the connection a ₁ and the switching contact S ₁ , C
Selectively connected to the color signal circuit 26 for processing the signal,
On the other hand, the input terminal 22 is selectively connected to the color signal circuit 26 via the buffer amplifier 24, the contact b ₁ and the switching contact S ₁ . The output terminals of the luminance signal circuit 25 and the color signal circuit 26 are connected to the matrix circuit 27, and the matrix circuit 27 is further connected to the red CRT 28 _R , the green CRT 28 _G and the blue CRT 28 _B. The matrix circuit 27 receives the respective output signals of the luminance signal circuit 25 and the color signal circuit 26 and forms a red drive signal, a green drive signal and a blue drive signal,
They are supplied to red CRT28 _R , green CRT28 _G and blue CRT28 _B , respectively. Further, in connection with the luminance signal circuit 25, contacts a ₂ and b ₂ and a switching contact S ₂ are provided, and a trap 31 for removing the C signal component is provided with a contact a ₂ and the switching contact S _2. It is selectively connected to the luminance signal circuit 25 via ₂ . Switching contact S ₁ and
S ₂ is linked and is controlled by the relay 29, and the relay 29 takes a non-operating state and an operating state according to the opening / closing operation of the switch 30.

Based on such a configuration, when a composite video signal formed by synthesizing a Y signal and a C signal by an external device is supplied to the external input terminal section, that is, when the Y signal is input by the external device to the input terminal 21. When a composite video signal formed by combining with a C signal is supplied, and when a Y signal and a C signal separated from each other by an external device are supplied to the external input terminal section,
That is, the Y separated from the input terminal 21 by the external device
Y signal of C signal and C signal is supplied,
When the input terminal 22 is supplied with the C signal of the Y signal and the C signal separated from each other by the external device, the following operation is performed.

i) When the composite video signal formed by synthesizing the Y signal and the C signal is supplied to the input terminal 21 by the external device, the switch 30 is set to the open state, which causes the relay 29 to be in the non-operating state. The switching contact piece S ₁ is connected to the contact piece a ₁ , and the switching contact piece S ₂ is connected to the contact piece a ₂ . Therefore, the composite video signal supplied to the input terminal 21 is supplied to the luminance signal circuit 25 after being amplified by the buffer amplifier 23, and is also supplied to the color signal circuit 26 through the switching contact S ₁ . As a result, the matrix circuit 27
A red drive signal, a green drive signal and a blue drive signal based on the composite video signal supplied to the input terminal 21 are obtained from the red CRT28 _R , green CRT28 _G and blue CRT, respectively.
Supplied to RT28 _B , red CRT28 _R , green CRT28 _G and blue CRT2
8 _B color image formation is performed.

At this time, the C signal component in the composite video signal supplied to the luminance signal circuit 25 is removed by the trap 31 connected to the luminance signal circuit 25 through the switching contact S ₂ . Thereby,
The luminance signal circuit 25 outputs the Y signal output without the color signal beat interference, and the red drive signal, the green drive signal, and the blue drive signal obtained from the matrix circuit 27 are output by the red CRT28 _R , the green CRT28 _G, and the blue CRT28 _B. It is supposed that a high quality reproduced color image is formed.

ii) The input terminal 21 is supplied with the Y signal of the Y signal and the C signal separated from each other by the external device, and the input terminal 22 is supplied with the Y signal of the Y signal and the C signal separated from each other by the external device. When the C signal is supplied, the switch 30 is closed, whereby the relay 29 is activated and the switching contact S ₁ is inverted and connected to the contact b ₁ and the switching contact S ₁ is turned on. It is assumed that the piece S ₂ is inverted and connected to the contact b ₂ . Therefore, the input terminal 21
Is supplied to the luminance signal circuit 25 after being amplified by the buffer amplifier 23, while the C signal supplied to the input terminal 22 is amplified by the buffer amplifier 24.
It is supplied to the color signal circuit 26 through the switching contact S ₁ . As a result, a red drive signal based on the Y signal supplied to the input terminal 21 and the C signal supplied to the input terminal 22 is obtained from the matrix circuit 27, and the red drive signal RRT28 _R and the green drive signal CRT28 respectively.
It is supplied to the _G and blue CRT 28 _B, a color image is formed by the red CRT 28 _R, green CRT 28 _G, and blue CRT 28 _B.

In such a case, the trap 31 is separated from the luminance signal circuit 25.

In this way, when the composite video signal formed by combining the Y signal and the C signal by the external device is supplied to the external input terminal portion, and when the Y signal separated by the external device is provided to the external input terminal portion. In both cases where the signal and the C signal are supplied, Y forming the supplied composite video signal
It is possible to obtain a high quality color reproduction image based on the signals and the C signals, or the Y and C signals supplied separately from each other.

Note that the setting of the switching contacts S ₁ and S ₂ is reversed from the above, and when the composite video signal is supplied, the switch 30 is closed and the relay 29 is operated, and the switching contacts S ₁ and It is also possible that S ₂ is inverted and connected to contacts a ₁ and a ₂ , respectively.

G-2 Second Circuit Configuration Example Related to the Invention (FIG. 2) FIG. 2 shows a main part of another example of the circuit configuration forming the color television signal processing device related to the present invention. In this example, the relay 29 is controlled in a circuit manner without using the switch 30 in the main part of the circuit configuration example shown in FIG. That is, in the example of FIG. 2, the presence or absence of the output of the buffer amplifier 24 is detected by the detection circuit 32, and the drive circuit 33 connected to the detection circuit 32 operates only when the detection output is obtained from the detection circuit 32. To be The output end of the drive circuit 33 is connected to one end of the relay 29, and when the drive circuit 33 is operated, the relay
29 is activated. Therefore, the drive circuit 33 supplies the input terminal 21 with the Y signal of the Y signal and the C signal separated from each other by the external device, and supplies the input terminal 22 with the Y signal separated from each other by the external device. The relay 29 is activated only when the C signal of the C and C signals is supplied and the output of the buffer amplifier 24 is present. That is, the operating state and the non-operating state of the relay 29 are automatically set.

Also in such an example, when the composite video signal formed by synthesizing the Y signal and the C signal is supplied to the external input terminal section by the external device, that is, the Y signal and the C signal are input to the input terminal 21 by the external device. When the composite video signal formed by combining and is supplied, that is, when the composite video signal formed by combining the Y signal and C by an external device is supplied to the input terminal 21, The C signal component in the composite video signal supplied to the signal circuit 25 is removed by the trap 31 connected to the luminance signal circuit 25 through the switching segment S ₂ .

Note that the setting of the switching contacts S ₁ and S ₂ is reversed from the above, and only when the detection output is not obtained from the detection circuit 32, the relay 29 is activated and the switching contacts S ₁ and S ₂ are reversed. It is also possible to connect the contacts a ₁ and b _{1 respectively} .

G-3 First Embodiment (FIG. 3) FIG. 3 shows a main part of an example of a color television signal processing device according to the present invention. In this example, the control of relay 29 is
The switch 30 in the main part of the circuit configuration example shown in FIG.
This is done by using a connector without using.

In the example shown in FIG. 3, a set of connectors consisting of a connector 34 _A and a connector 34 _B engaged with it, and a set of connectors consisting of a connector 37 _A and a connector 37 _B engaged with it are provided. The connectors are provided, and these connectors 34 _A , 34 _B , 37 _A, and 37 _B form a connector section.

The connector 34 _A is supposed to be provided with the input terminal 21, and the connector 34 _B is provided with the terminal 35,
A cable 36 for supplying a composite video signal formed by synthesizing the Y signal and the C signal is attached with its tip connected to the terminal 35. In addition, connector 37 _A has
Connector 34 other input terminal connected to an input terminal 21 provided on the _A 21 ', yet another input terminal 22, and the other terminal
38a and 38b are provided. Further, the connector 37 _B is provided with terminals 41, 42, 45 a and 45 b, the tip of a cable 43 for supplying a Y signal to the terminal 41 is connected, and a cable 44 for supplying a C signal to the terminal 42. Are connected to each other, and the terminals 45a and 45b are interconnected by a conductor 46.

The input terminals 21, 21 ′ and 22 form an external input terminal portion, and when the connector 34 _B is engaged with the connector 34 _A , the terminal 35 is connected to the input terminal 21 and combined with the input terminal 21. Video signal is supplied, while connector 37 _B
When it is engaged with 7 _A , the terminal 41 becomes the input terminal 21 ',
The terminal 42 is connected to the input terminal 22, the terminal 45a is connected to the terminal 38a, and the terminal 45b is connected to the terminal 38b. The Y signal is supplied to the input terminal 21 'and the C signal is supplied to the input terminal 22. Under these circumstances, the connectors 34 _A and 34 _{B form a} composite video signal input terminal portion, and the connectors 37 _A and 37 _{B form}
The Y / C separated video signal input terminal portion is configured, and the terminals 38a, 38b, 45a, 45b and the lead wire 46 form an engagement detecting means.

Input terminals 21 and 21 'are connected to Y via a buffer amplifier 23.
It is connected to a luminance signal circuit 25 for processing a signal, and is selectively connected to a color signal circuit 26 for processing a C signal via a buffer amplifier 23, a contact point a ₁ and a switching contact piece S ₁ , and is also input. Terminal 22 is buffer amplifier 24, contact b
It is selectively connected to the color signal circuit 26 via ₁ and the switching contact S ₁ . Further, the terminal 38a is connected to the relay 29 through the lead wire 39, and the terminal 38b is grounded through the lead wire 40.

With such a configuration, when the composite video signal formed by combining the Y signal and the C signal is supplied to the external input terminal section by the external device, that is, the external device is connected to the input terminal 21. When the composite video signal formed by combining the Y signal and the C signal is supplied by
Connector 34 _B is engaged with connector 34 _A ,
37 _B is in a state where it cannot be engaged with the connector 37 _A.
As a result, the relay 29 is placed in the non-operating state, the switching contact piece S ₁ is connected to the contact a ₁ , and the switching contact piece S ₂ is connected to the contact a ₂ . Therefore, the composite video signal supplied from the terminal 35 to the input terminal 21 is
After being amplified by, it is supplied to the luminance signal circuit 25 and also supplied to the color signal circuit 26 through the switching contact S ₁ . As a result, from the matrix circuit 27, a red drive signal, a green drive signal and a blue drive signal based on the composite video signal supplied to the input terminal 21 are obtained, and the red drive signal
Supplied to CRT28 _R , green CRT28 _G and blue CRT28 _B , red CRT
28 _R , green CRT28 _G, and blue CRT28 _{B are used} for color image formation.

At this time, the C signal component in the composite video signal supplied to the luminance signal circuit 25 is removed by the trap 31 connected to the luminance signal circuit 25 through the switching contact S ₂ . Thereby,
The luminance signal circuit 25 outputs the Y signal output without the color signal beat interference, and the red drive signal, the green drive signal, and the blue drive signal obtained from the matrix circuit 27 are output by the red CRT28 _R , the green CRT28 _G, and the blue CRT28 _B. It is supposed that a high quality reproduced color image is formed.

When the Y signal and the C signal separated from each other by the external device are supplied to the external input terminal unit,
That is, the Y signal of the Y signal and the C signal separated from each other by the external device is supplied to the input terminal 21 ', and the Y signal of the Y signal and the C signal separated from each other by the external device are supplied to the input terminal 22'. when the C signal is adapted to be supplied, the connector 34 _B can not be brought into engagement with the connector 34 _a, the connector 37 _B is a state induced to engage the connector 37 _a. Thereby, between the terminal 38a and the terminal 38b,
Terminal 45a, are caused to conduct via conductors 46 and the terminal 45b, the relay 29 is actuated, together with the switching contact pieces S ₁ is connected is allowed inverted contact b _1, the switching contact piece S ₂ also reversed allowed Connected to the contact b ₂ . Therefore, the Y signal supplied from the terminal 41 to the input terminal 21 'is
After being amplified by 23, it is supplied to the luminance signal circuit 25, while
The C signal supplied from the terminal 42 to the input terminal 22 is amplified by the buffer amplifier 24 and then supplied to the color signal circuit 26 through the switching contact S ₁ . As a result, a red drive signal, a green drive signal and a blue drive signal based on the Y signal supplied to the input terminal 21 'and the C signal supplied to the input terminal 22 are obtained from the matrix circuit 27, and the red drive signal and the red drive signal are respectively obtained.
Supplied to CRT28 _R , green CRT28 _G and blue CRT28 _B , red CRT
28 _R , green CRT28 _G, and blue CRT28 _{B are used} for color image formation.

In such a case, the trap 31 is separated from the luminance signal circuit 25.

In this way, a case where the composite video signal formed by combining the Y signal and the C signal by the external device is supplied to the input terminal 21 through the set of connectors 34 _A and 34 _B ,
37 In any of the case _{where A} and 37 Y signal and the C signal separated from each other by an external device to the input terminals 21 'and 22 through a set of _B are respectively supplied also, Y signals and C to form a composite video signal A high-quality reproduced color image can be obtained based on the signals or the Y and C signals supplied separately from each other.

G-4 Third Circuit Configuration Example Related to the Invention (FIG. 4) FIG. 4 shows a main part of still another example of the circuit configuration forming the color television signal processing device related to the present invention. In this example, a comb filter 47 is used,
The Y signal and the C signal are separated from the composite video signal supplied to the input terminal 21 and formed by combining the Y signal and the C signal by an external device, and the input terminal of the comb filter 47 is separated. Is connected to the input terminal 21 and the comb filter 47
Y signal output end of Y is connected via contact a ₁ and switching contact S ₁ to Y
The C signal output terminal of the comb filter 47 is connected to the contact signal a _{2 while} being selectively connected to the luminance signal circuit 25 for processing the signal.
And the switching contact S ₂ to selectively connect to the color signal circuit 26 for processing the C signal.

A buffer amplifier 23 is also connected to the input terminal 21,
The output end of the buffer amplifier 23 is selectively connected to the luminance signal circuit 25 via the contact b ₁ and the switching contact S ₁ . On the other hand, the input terminal 22 is connected to the input end of the buffer amplifier 24, and the output end of the buffer amplifier 24 has a contact b ₂ and a switching contact piece.
It is selectively connected to the color signal circuit 26 via S ₂ .

The switching contacts S ₁ and S ₂ are interlocked with each other and are controlled by the relay 29, and the relay 29 takes a non-operating state and an operating state according to the opening / closing operation of the switch 30.

Based on such a configuration, when a composite video signal formed by synthesizing a Y signal and a C signal by an external device is supplied to the external input terminal section, that is, when the Y signal is input by the external device to the input terminal 21. When the composite video signal formed by combining with the C signal is supplied, the switch 30 is set to the open state, whereby the relay 29 is deactivated and the switching contact S _{The state in which 1} is connected to a ₁ and the switching contact S ₂ is connected to the contact a ₂ is maintained. Under such circumstances, the composite video signal from the input terminal 21 is supplied to the comb filter 47, and in the comb filter 47, the sum and difference of the composite video signal at that time and the composite video signal delayed by one line are calculated. As a result, the Y signal and the C signal are obtained at the Y signal output end and the C signal output end, respectively. The Y signal obtained at the Y signal output end is supplied to the luminance signal circuit 25 through the contact a ₁ and the switching contact piece S ₁ , and the C signal is applied to the contact signal.
It is supplied to the color signal circuit 26 through a ₂ and the switching contact S ₂ .
As a result, from the matrix circuit 27, the red drive signal based on the supplied composite video signal to the input terminal 21, the green drive signal and the blue driving signal is obtained, respectively, a red CRT 28 _R, green CRT 28 _G, and blue CRT 28 _B Supplied, red C
Color image formation is performed by RT28 _R , green CRT28 _G, and blue CRT28 _B.

On the other hand, when the Y signal and the C signal separated from each other by the external device are supplied to the external input terminal unit, that is,
The input terminal 21 is supplied with Y signals of Y signals and C signals separated from each other by an external device, and the input terminals 22 are supplied with C signals of Y signals and C signals separated from each other by an external device. Is supplied, the switch 30 is closed, whereby the relay 29 is actuated, the switching contact S ₁ is inverted and connected to the contact b ₁ , and the switching contact S ₁ is turned on. S ₂ is inverted and connected to contact b ₂ . Therefore, the Y supplied to the input terminal 21
After the signal is amplified by the buffer amplifier 23, it is supplied to the luminance signal circuit 25 through the contact b ₁ and the switching contact S ₁ , while
The C signal supplied to the input terminal 22 is amplified by the buffer amplifier 24 and then supplied to the color signal circuit 26 through the contact b ₂ and the switching contact S ₂ . As a result, a red drive signal, a green drive signal, and a blue drive signal based on the Y signal supplied to the input terminal 21 and the C signal supplied to the input terminal 22 are obtained from the matrix circuit 27, and the red CR signal is obtained respectively.
Supplied to T28 _R , green CRT28 _G and blue CRT28 _B , red CRT28
Color image formation is performed by _R , green CRT28 _G, and blue CRT28 _B.

In this way, the external input terminal is
When a composite video signal formed by synthesizing a signal and a C signal is supplied, and when Y is separated from each other by an external device.
In both cases where the signal and the C signal are supplied, the reproduction based on the supplied Y signal and the C signal, or as the separated Y signal and the C signal, which form the composite video signal. A color image will be obtained.

In addition, when the setting of the switching contacts S ₁ and S ₂ is reversed to the above and the composite video signal is supplied to the input terminal 21, the switch 30
Is closed and relay 29 is activated, switching contact piece
S ₁ and S ₂ may be inverted and connected to the contacts a ₁ and b ₁ , respectively. Further, without using the switch 30, the control of the relay 29 may be performed in a circuit manner like the main part of the circuit configuration example shown in FIG.

G-5 Second Embodiment (FIG. 5) Further, as shown in FIG. 5, without using the switch 30 in the main part of the circuit configuration example shown in FIG. 4, as shown in the example of FIG. Alternatively, the control of the relay 29 may be performed using the connector.

H Effect of the Invention As is apparent from the above description, in the color television signal processing device according to the present invention, the composite video signal formed by combining the Y signal and the C signal by the external device is supplied. A composite video signal input terminal section including a pair of connectors and a Y / C separated video signal input terminal section including a pair of connectors to which Y signals and C signals separated from each other by an external device are supplied are provided. When the composite video signal from the composite video signal input terminal is supplied to the luminance signal circuit and the chrominance signal circuit, respectively, and the Y and C signals separated from each other from the Y / C separated video signal input terminal are When the composite video signal is supplied to the composite video signal input terminal, the signal removing means is used to selectively supply the brightness signal circuit and the color signal circuit. C constituting it from the supplied composite video signal
The signal is removed, or the signal separating means separates the Y signal and the C signal forming the composite image signal supplied to the external input terminal, which is relatively simple. Therefore,
Through the composite video signal input terminal, without the inconvenience that the manufacturing cost etc. will increase significantly,
When a composite video signal formed by synthesizing a Y signal and a C signal is supplied by an external device, and a Y signal and a C signal which are separated from each other by an external device through a Y / C separated video signal input terminal unit In any case, the luminance signal circuit outputs a Y signal output that does not cause color signal beat interference, and the image display processing unit outputs a high-quality reproduced color image. can get.

Therefore, the color television signal processing device according to the present invention is derived, for example, in a color image reproduction based on a composite video signal derived from the magnetic recording / reproducing device and in a state where the color television signal processing device is separated from the magnetic recording / reproducing device. Whichever color image reproduction is performed based on the Y signal and the C signal, a high quality reproduced image can be obtained based on the Y signal and the C signal reproduced by the magnetic recording / reproducing apparatus.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of an example of a circuit configuration forming a color television signal processing device related to the present invention, and FIG. 2 is a circuit configuration forming a color television signal processing device related to the present invention. FIG. 3 is a block diagram showing a main part of another example, FIG. 3 is a block diagram showing a main part of an example of a color television signal processing device according to the present invention, and FIG. 4 is a color television signal processing related to the present invention. FIG. 5 is a block diagram showing a main part of still another example of the circuit configuration forming the device, FIG. 5 is a block diagram showing a main part of another example of the color television signal processing device according to the present invention, and FIG. 6 is a color diagram. FIG. 3 is a block diagram provided for explaining recording and reproduction of a video signal. In the figure, 21, 21 'and 22 are input terminals, 25 is a luminance signal circuit, 2
6 is color signal circuit, 27 is matrix circuit, 28 _R is red CR
T, 28 _G is green CRT, 28 _B is blue CRT, 29 is relay, 30 is switch, 31 is trap, 32 is detection circuit, 33 is drive circuit,
34 _A , 34 _B , 37 _A and 37 _B are connectors, 47 is a comb filter, S ₁
And S ₂ are switching contacts, and a ₁ , b ₁ , a ₂ and b ₂ are contacts.

Continuation of the front page (56) References JP-A-49-105419 (JP, A) JP-A-52-72120 (JP, A) JP-A-50-150319 (JP, A) Jitsuko 43-16506 (JP , Y1) Jikkou 48-27609 (JP, Y1) "TV technology" 79.9. Temporary special edition All television maker service book Color television wiring diagram 42. And 25

Claims (2)

[Claims] 1. A composite video signal input terminal portion comprising a pair of connectors to which a composite video signal formed by combining a luminance signal and a chrominance signal from an external device is supplied when brought into a mutually engaged state. , A Y / C separated video signal input terminal section comprising a pair of connectors to which a mutually separated luminance signal and color signal from an external device are supplied when brought into a mutual engagement state, and the composite video signal input terminal section To the composite video signal input terminal part, or a brightness signal circuit for performing signal processing on the brightness signal supplied to the Y / C separated video signal input terminal part, and to the composite video signal input terminal part. A color signal forming a composite video signal, or a color signal circuit that performs signal processing on the color signal supplied to the Y / C separated video signal input terminal section, and the composite video signal input terminal section and the Y / C C The composite video signal is provided between the separated video signal input terminal portion and each of the luminance signal circuit and the color signal circuit, and the composite video signal supplied to the composite video signal input terminal portion is directly or subjected to predetermined processing. A composite processing mode in which the composite video signal supplied to the brightness signal circuit and supplied to the composite video signal input terminal portion is directly or subjected to predetermined processing and supplied to the color signal circuit; / C separated video signal input to the luminance signal and the color signal is supplied to the luminance signal circuit and the color signal circuit respectively Y / C separation processing mode, the signal that can be selectively Switching means and signal removing means for selectively taking a signal removal state of removing a color signal forming the composite video signal from the composite video signal supplied to the luminance signal circuit, or the composite video signal Signal separating means for selectively separating a luminance signal and a chrominance signal forming the composite video signal from the composite video signal supplied to the input terminal portion and passing the signal switching means, / C separated video signal input terminal section, the engagement detection means for detecting whether or not a pair of connectors forming the Y / C separated video signal input terminal section are in the mutually engaged state, When it is detected by the match detection means that the pair of connectors forming the Y / C separated video signal input terminal portion are in the mutually engaged state, the signal switching means is set to the Y / C separated processing mode. Further, when it is detected by the engagement detecting means that the pair of connectors forming the Y / C separated video signal input terminal portion are not in the mutual engagement state, the signal switching means performs the composite processing. While taking the mode, It said signal removal state serial signal removal means, or configured and a switching control means to assume said signal separation state to the signal separating means color television signal processing apparatus. 2. The signal separation means is constituted by a filter for separating a luminance signal and a chrominance signal forming the composite video signal from the composite video signal supplied to the composite video signal input terminal portion, and the signal switching means comprises: First switching means for selectively taking out the luminance signal separated by the filter and the luminance signal supplied to the Y / C separated video signal input terminal portion, and the color signal separated by the filter and the Y / C separation 2. The color television signal processing device according to claim 1, further comprising a second switching means for selectively extracting the color signal supplied to the video signal input terminal portion.