JPH01125090A - Color television signal processing device - Google Patents

Abstract

PURPOSE:To obtain, even when a Y-signal and a C-signal are supplied separately, a reproduced image based on the supplied Y-signal and C-signal by providing a signal switching means between an external input terminal part and a luminance signal circuit and a color signal circuit. CONSTITUTION:When a composite video signal is supplied to an input terminal 21 through a pair of connectors 34A, 34B, a connector 37A and that 37B do not engage with each other, a relay 29 comes in a non-operating status, and the composite video signal supplied to the input terminal 21 is supplied to the luminance signal 25 through a buffer amplifier 23, and at the same time supplied to the color signal circuit 26 through a switching glossa S1. In case a Y-signal and a C-signal separated from each other are respectively supplied to an input terminal 21' and that 22 through the pair of connectors 37A, 37B, the connectors 37A and 37B engage with each other, the relay 29 operates, so that the Y-signal supplied to the terminal 21' is supplied to the circuit 25 via the amplifier 23, while the C-signal supplied to the terminal 22 is supplied to the circuit 26 via the amplifier 24 and the glossa S1.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A Industrial field of application B Summary of the invention C Prior art D5 Problem to be solved by the invention E Means for solving the problem F Effect G Example H Effect of the invention A Industrial field of application The present invention is directed to color The present invention relates to a color television signal processing device that allows a reproduced image to be obtained based on a luminance signal and a color signal that constitute a video signal.

B. Summary of the Invention The present invention provides a luminance signal circuit 9 a color signal circuit 9 an image display processing section, in order to be able to obtain a reproduced image based on a luminance signal and a color signal constituting a color video signal. In a color television signal processing device equipped with, etc., a composite video signal formed by combining a luminance signal and a color signal,
Alternatively, the device includes an external input terminal section to which mutually separated luminance signals and color signals are supplied through the connector section, and is provided between the external input terminal section and each of the luminance signal circuit and the chrominance signal circuit. When the connector section is configured to supply a composite video signal to the external input terminal section by means of a signal switching means, the composite video signal supplied to the external input terminal section or the luminance signal forming it is supplied to the luminance signal circuit. At the same time, the composite video signal supplied to the external input terminal section or the color signal forming the composite video signal is supplied to the color signal circuit, and the connector section outputs the separated luminance signal and color signal. When the signal is supplied to the external input terminal section, the luminance signal and color signal supplied to the external input terminal section are supplied to the luminance signal circuit and the color signal circuit, respectively. When a composite video signal is supplied through an external input terminal section without causing any inconvenience such as a significant increase in manufacturing costs, and
In any case where a luminance signal and a chrominance signal that are separated from each other are supplied through an external input terminal section, the luminance signal and chrominance signal that form the supplied composite video signal, or the luminance signal and chrominance signal that are supplied separately from each other. A reproduced image can be obtained based on a luminance signal and a color signal.

C. Prior Art Generally, recording and reproducing of color video signals is performed using a magnetic recording and reproducing device.Recording and reproducing of such color video signals will be explained with reference to FIG.

FIG. 2 shows the configuration of the magnetic recording and reproducing device.
This magnetic recording and reproducing device has a recording system (1) and a reproducing system (II).
). The recording system (i) includes an input terminal to which a composite video signal is supplied as a color video frame: 1. Low pass filter (LPF) 2. Band pass filter (BPF)
3. Pre-emphasis circuit 49 Frequency modulation circuit 5. Amplifier 62 frequency conversion circuit 7. The reproducing system (II) includes an amplifier 8 and a recording head 9, and the reproducing system (II) includes a reproducing head 11. Amplifier 12. Bypass filter (HPF) 1
3. Low-pass filter 149 frequency demodulation circuit 15. De-emphasis circuit 169 Frequency conversion circuit 17. It is configured to include an amplifier 18 and an output terminal 19, and the recording system (1) and the reproduction system [■] have an oscillator (
O3C)to is provided. The recording and reproduction of the color video signal is performed using the magnetic tape 20.

Based on this configuration, a luminance signal (Y signal) and a color signal (C signal) are separated from a composite video signal supplied to the input terminal 1 by the low-pass filter 2 and the band-pass filter 3. 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 frequency-modulated by a predetermined carrier signal in a frequency modulation circuit 5 to obtain a pre-determined frequency band. Frequency table with! 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 converted to a low frequency by the frequency conversion circuit 7 to which the 4.27 MHz oscillation output signal from the oscillator 10 is supplied. Low-pass conversion C that is converted into a frequency band and sets the carrier frequency to 688KHz
Low-frequency conversion C obtained from the frequency conversion circuit 7 as a signal
A signal is provided to an 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, a signal read from the magnetic tape 20 by the reproducing head 11 passes through the amplifier 12 and is then supplied to a high-pass filter 13 and a low-pass filter 14, and a frequency-modulated Y signal is extracted by the bypass filter 13. A low frequency converted C signal is extracted.

The frequency modulated Y signal from the bypass filter 13 is demodulated in a frequency demodulation circuit 15, and de-emphasis processing is applied to the demodulated output by a de-emphasis circuit 16 to reproduce the original Y signal. On the other hand, the low-pass converted C signal from the low-pass filter 14 is 4.27M! from the oscillator 1o. The frequency is converted in the frequency conversion circuit 17 to which the oscillation output signal (!) is supplied, thereby reproducing the original C signal with a carrier frequency of 3.58 MHz.The reproduced Y signal and C signal are After being mixed,
After passing through the amplifier for one day, the signal is output to the output terminal 19 as a composite video signal.

In this way, the composite video signal reproduced by the magnetic recording and reproducing device is supplied to a color television receiver for image reproduction based on the composite video signal, and in the color television receiver, the cathode ray tube ( CRT)
Above, do as you would for a normal received color video signal,
An image based on the composite video signal reproduced by the magnetic recording and reproducing device is obtained.

Furthermore, when recording and reproducing color video signals using the magnetic recording/reproducing device, as indicated by the broken lines in FIG. It has also been proposed that the images are derived without being mixed and used for image reproduction based on them.

D Problems to be Solved by the Invention As mentioned 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 However, image reproduction based on such mutually separated Y and C signals is However, there is an inconvenience in that it cannot be performed with conventional color television receivers.

In view of the above, the present invention provides a case where a composite video signal formed by combining a Y signal and a C signal is supplied, and
To make it possible to obtain a reproduced image based on the supplied Y signal and C signal even when the Y signal and C signal are supplied separately from each other, and to have a relatively simple configuration for the function. It is an object of the present invention to provide a color television signal processing device that can achieve the following.

E. Means for Solving the Problems To achieve the above-mentioned objects, the color television signal processing device according to the present invention provides a composite video signal formed by combining a Y signal and a C signal, which is provided in a connector section. Alternatively, an external input terminal section to which mutually separated Y and C signals are supplied through a connector section, a luminance signal circuit that performs signal processing on the Y signal, and a chrominance signal circuit that performs signal processing on the C signal. , a signal switching means provided between the external input terminal section and each of the luminance signal circuit and the chrominance signal circuit, a switching control section for controlling the signal switching means, and an output of each of the luminance signal circuit and the chrominance signal circuit. The signal switching means supplies the composite video signal supplied to the external input terminal section or the Y signal forming the composite video signal to the luminance signal circuit, and also outputs the signal to the external input terminal section. A first state in which the supplied composite video signal or the C signal forming the composite video signal is supplied to the color signal circuit, and the Y signal and C signal supplied to the external input terminal section are supplied to the luminance signal circuit and the color signal circuit, respectively. When the connector section is configured to supply the composite video signal to the external input terminal section, the switching control section is configured to control the signal switching means to select the second state in which the signal is supplied. When the connector section is configured to supply the mutually separated Y signal and C signal to the external input terminal section, the signal switching means is configured to assume the second state, configured.

F Effect In the color television signal processing device according to the present invention configured as described above, based on a relatively simple configuration,
Therefore, when a composite video signal is supplied to the external input terminal section without causing inconveniences such as a significant increase in manufacturing costs, and when mutually separated Y signals are supplied to the external input terminal section, and C signals are supplied, either the Y signal and the C signal forming the supplied composite video signal, or the Y signal and the C signal supplied separately from each other.
A reproduced image is obtained based on the signal and the C signal, and thus, for example, not only image reproduction based on a composite video signal derived from the magnetic recording and reproducing device, but also derived from the magnetic recording and reproducing device in a mutually separated state. Image reproduction is performed based on the Y signal and C signal, and it is possible to obtain a high-quality reproduced image based on the Y signal and C signal reproduced by the magnetic recording and reproducing device.

G Example Examples of the present invention will be described below.

FIG. 1 shows a main part of an example of a color television signal processing device according to the present invention, in this example, a connector 34A
A connector set consisting of a connector 34B and a connector 34B engaged therewith, and a connector set consisting of a connector 37A and a connector 37B engaged therewith are provided, and these connectors 34A, 34B, 37A and 37B provide A connector portion is formed.

The connector 34A is provided with an input terminal 21, and the connector 34B is provided with a terminal 35, and a cable 36 that supplies a composite video signal formed by combining the Y signal and the C signal is connected to its tip. The terminal 35
It is attached and connected to. Also, connector 3
7A includes another input terminal 21' connected to the input terminal 21 provided on the connector 34A, and another input terminal 2 connected to the input terminal 21 provided on the connector 34A.
2, and other terminals 38a and 38b are provided. In addition, the connector 37B has a terminal 41°42.45a.
and 45b are provided, and the tip of the cable 43 that supplies the Y signal to the terminal 41 is connected to the terminal 41.
The tip of the cable 44 that supplies the C signal to 2 is connected to
Further, the terminals 45a and 45b are interconnected by a conductive wire 46.

The input terminals 21, 21' and 22 form an external input terminal section, and when the connector 34B is engaged with the connector 34A, the terminal 35 is connected to the input terminal 21, and a composite video signal is input to the input terminal 21. is supplied, while when connector 37B is engaged with connector 37A,
Terminal 4 is input terminal 21°, terminal 42 is input terminal 22
The terminal 45a is connected to the terminal 38a, the terminal 45b is connected to the terminal 38b, and the Y5 signal is supplied to the input terminal 21°, and the C signal is supplied to the input terminal 22.

The input terminals 21 and 21' are connected via a buffer amplifier 23 to a luminance signal circuit 25 for processing the Y signal, and are connected to a luminance signal circuit 25 for processing the C signal via the buffer amplifier 23, contact a, and switching contact SI. The input terminal 22 is selectively connected to a color signal circuit 26 that performs processing, and the input terminal 22 is connected via a buffer amplifier 24, a contact S, and a switching contact S1.
It is selectively connected to the color signal circuit 26. Furthermore, the terminal 38a
is connected to the relay 29 through a conductor 39, and the terminal 38b is grounded through a conductor 40.

The output ends of the luminance signal circuit 25 and the color signal circuit 26 are connected to a matrix circuit 27, and the matrix circuit 27 further includes a red CRT 28R.

The matrix circuit 27 to which the green CRT 28G and the blue CRT 28B are connected receives the respective output signals of the luminance signal circuit 25 and the color signal circuit 26, forms a red drive signal, a green drive signal, and a blue drive signal, and outputs them. is supplied to the red CRT 28R, green CRT 28G, and blue CRT 28B, respectively. In addition, the luminance signal circuit 2
5, contacts a2 and bt and a switching contact SO are provided, and a trap 3 for removing the C signal component is provided.
1 is selectively connected to the brightness signal circuit 25 via the contact a and the switching contact S2. Switching contact piece S.

and S8 are interlocked and controlled by a relay 29, which takes an activated state or a non-activated state depending on whether or not the connector 37B is engaged with the connector 37A.

Based on this configuration, when a composite video signal is supplied to the external input terminal section, that is, when a composite video signal is supplied to the input terminal 21, and when a mutually separated Y signal is supplied to the external input terminal section. and C signals are supplied, i.e. input terminal 2
The following operations are performed in each case where a Y signal is supplied to input terminal 1' and a C signal is supplied to input terminal 22.

i) When a composite video signal is supplied to the input terminal 21, the connector 34B is engaged with the connector 34A, and the connector 37B is not engaged with the connector 37A. As a result, the relay 29 is placed in a non-operating state, the switching contact piece S is connected to the contact point a, and the state in which the switching contact piece S2 is connected to the contact point a2 is maintained.

Therefore, the composite video signal supplied from the terminal 35 to the input terminal 21 is amplified by the buffer amplifier 23 and then supplied to the brightness signal circuit 25, and also to the switching contact S.

The color signal is supplied to the color signal circuit 26 through the signal line. As a result, a red drive signal based on the composite video signal supplied to the input terminal 21 from the matrix circuit 27.

A green drive signal and a blue drive signal are obtained, and the red CRT28R, green CRT213G and blue C
Supplied to RT28B, red CRT28R, green CRT
Color images are formed using a 28G and blue CRT 28B. - Also, at this time, the C signal component in the composite video signal supplied to the brightness signal circuit 25 is removed by the trap 31 connected to the brightness signal circuit 25 through the switching contact St.

ii) When the Y signal is supplied to the input terminal 21° and the C signal is supplied to the input terminal 22, the connector 34B is not engaged with the connector 34A, and the connector 37B is engaged with the connector 37A. Ru. As a result, between the terminal 38a and the terminal 38b, the terminal 45a
, are electrically connected via the conductive wire 46 and the terminal 45b,
The relay 29 is activated, the switching contact S1 is reversed and connected to the contact S8, and the switching contact S1 is connected to the switching contact S8.
is also inverted and connected to contact b2. Therefore, the Y signal supplied from the terminal 41 to the input terminal 21' is amplified by the buffer amplifier 23 and then supplied to the luminance signal circuit 25, while the C signal supplied from the terminal 42 to the input terminal 22 is After being amplified by the buffer amplifier 24, it is supplied to the color signal circuit 26 through the switching contact S. As a result, a red drive signal, a green drive signal, and a blue drive signal are obtained from the matrix circuit 27 based on the Y signal supplied to the input terminal 21' and the 1C signal supplied to the input terminal 22. , red CRT28R, green C
Supplied to RT28G and blue CRT28B, red CR
Color image formation is performed using T28R, green CRT 28G, and blue CRT 28B.

In addition, in such a case, the trap 31 is connected to the luminance signal circuit 25.
be separated from

In this way, when a composite video signal is supplied to the input terminal 21 through the pair of connectors 34A and 34B, and when the Y signal and C signal separated from each other are supplied to the input terminals 21'' and 22 through the pair of connectors 37A and 37B. In either case, a reproduced image is obtained based on the Y signal and C signal that form a composite video signal, or the Y signal and C signal that are supplied separately from each other.

Note that the terminals 38a and 38b in this example are provided in the connector 34A, and the terminal 45a is also provided in the connector 34A.

45b and q conductors 46 are provided in the connector 34B, and the settings of the switching contacts SI and S2 are reversed to those described above, and when the connector 34A is connected to the connector 34B, the relay 29 is activated, The switching contacts Sl and S2 may also be reversed.

In the above example, when a composite video signal is supplied to the input terminal 21, the composite video signal passes through the buffer amplifier 23, then the luminance signal circuit 25 and the color signal circuit 2.
However, when a Y signal/C signal separation circuit such as a comb filter is connected to the input terminal 21 and a composite video signal is supplied to the input terminal 21, The composite video signal is separated into Y signal and C signal by the 5Y signal/C signal separation circuit, and the Y signal/C signal is separated into Y signal and C signal.
The Y signal and C signal obtained from the signal separation circuit may be supplied to the luminance signal circuit 25 and the color signal circuit 26, respectively.

Effects of the Invention H As is clear from the above explanation, the color television signal processing device according to the present invention has an external input terminal section to which a composite video signal or a Y signal and a C signal are supplied through a connector section. is provided between the external input terminal section and the luminance signal circuit and the color signal circuit, and the connector section is intended to supply the composite video signal to the external input terminal section. The Y signal forming the composite video signal is processed in the luminance signal circuit, and the C signal forming the composite video signal supplied to the external input terminal section is processed in the color signal circuit. When the Y signal and C signal separated into 2 are to be supplied to an external input terminal section, the Y signal and C signal supplied to the external input terminal section are processed in a luminance signal circuit and a chrominance signal circuit, respectively. Since the signal switching means controlled by the switching control section is arranged so as to change the state, when a composite video signal is supplied to the external input terminal section, and
In any case where the Y signal and C signal are supplied separately to the external input terminal section, the Y signal and qC signal are supplied as forming a composite video signal, or the Y signal and qC signal are supplied separately from each other. Based on the Y signal and C signal (reproduced image can be obtained, and its function is
This can be accomplished with a relatively simple configuration and without any inconveniences such as a significant increase in manufacturing costs.

When the color television signal processing device according to the present invention is used, for example, not only image reproduction based on a composite video signal derived from a magnetic recording and reproducing device, but also
Image reproduction based on the Y signal and C signal derived from the magnetic recording and reproducing device in a state separated from each other is possible, and high quality reproduction is possible based on the Y signal and C signal reproduced by the magnetic recording and reproducing device. This will allow you to obtain images.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing essential parts of an example of a color television signal processing apparatus according to the present invention, and FIG. 2 is a block diagram for explaining recording and reproduction of color video signals. In the figure, 21, 21° and 22 are input terminals, 25 is a luminance signal circuit, 26 is a color signal circuit, 27 is a matrix circuit,
, 28R is a red CRT, 28G is a green CRT, 28B is a blue CRT, '29 is a relay, Sl and S2 are switching contacts, and 34A, 34B, 37A and 37B are connectors.

Claims (1)

[Claims] A composite video signal provided in the connector section and formed by combining a luminance signal and a chrominance signal, or a luminance signal and a chrominance signal separated from each other is supplied through the connector section. an external input terminal section, a luminance signal circuit that performs signal processing on the luminance signal, a chrominance signal circuit that performs signal processing on the chrominance signal, and between the external input terminal section and each of the luminance signal circuit and the chrominance signal circuit. and the composite video signal supplied to the external input terminal section or the luminance signal forming the composite video signal is supplied to the luminance signal circuit, and the composite video signal supplied to the external input terminal section or the luminance signal forming the composite video signal is supplied to the luminance signal circuit. a first state in which a color signal is supplied to the color signal circuit; and a second state in which a luminance signal and a color signal supplied to the external input terminal section are supplied to the luminance signal circuit and the color signal circuit, respectively. a signal switching means that can selectively assume the first state; and when the connector section is configured to supply a composite video signal to the external input terminal section, causing the signal switching means to take the first state; When the connector section is configured to supply a luminance signal and a color signal separated from each other to the external input terminal section, a switching control section for causing the signal switching means to take the second state; A color television signal processing device comprising: an image display processing section to which respective outputs of a signal circuit and a color signal circuit are supplied.