JPH05260517A - Television receiver - Google Patents

Abstract

PURPOSE:To suppress a circuit scale so as to become small, and to improve a picture quality by using an IH delay line as a noise filter at the time of video reproducing mode, and using its delay line for luminance/chroma separation at the time of receiving a TV. CONSTITUTION:In a video reproducing mode for reproducing a magnetic tape by a video head, a chroma signal in a video signal reproduced by a video head 21 is inputted to an IH delay line 8 through a mixer circuit 20, an LPF16, a low frequency converter 15, a chroma processing circuit 14 and a switch 7. In this line 8, a chroma noise is eliminated, and inputted to a chroma processing circuit 9 of a receiving circuit 5. In the same way, a luminance signal is sent to a luminance processing circuit 10 of the receiving circuit 5 through a luminance processing circuit 17 and a switch 11, and both signals are displayed on a CRT 13 through a matrix circuit 12. On the other hand, at the time of receiving a TV, in a radio wave received by an antenna 1, the luminance signal and the chroma signal are separated and outputted by the line 8, and the luminance signal and the chroma signal are outputted and displayed 13 through the circuit 10 and the circuit 9, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver in which a video reproducing device is integrated, and more particularly to a video reproducing device provided with a 1H delay line for removing chroma noise.

[0002]

2. Description of the Related Art In a television receiver or the like having a built-in video reproducing apparatus, a 1H delay line is provided on the video reproducing circuit side in order to remove chroma noise from a video reproducing signal at the time of reproducing the video. The 1H delay line is not used at all in modes other than.

On the other hand, each of the video reproducing apparatus and the television receiver is provided with a luminance / chroma separation circuit, and each of these separation signals is processed by the image receiving circuit and together with the image signal, a cathode ray tube, a plasma tube, an LCD. Alternatively, it is displayed on a display device (hereinafter abbreviated as CRT) having an equivalent function.

[0004]

However, in such a conventional television receiver, the utilization efficiency of the 1H delay line is poor, and the circuit scale becomes large by providing the luminance / chroma separation circuit also on the video reproducing device side. ,
There was a problem that it caused an increase in cost.

The present invention has been made by paying attention to the conventional problems as described above. The 1H delay line is used as a noise filter in the video reproduction mode, and used for luminance / chroma separation during television reception. Thus, an object of the present invention is to provide a television receiver that can reduce the circuit size, improve image quality, and reduce cost.

[0006]

SUMMARY OF THE INVENTION A television receiver according to the present invention is a television receiver having a built-in video reproducing device, and a switch for selecting one of a composite video signal by television reception and a chroma signal in a video reproduction signal. A 1H delay line that separates a luminance signal and a chroma signal from the composite video signal input through the switch, and removes chroma noise from the video reproduction signal, and a luminance signal that is separated by the 1H delay line. The chroma signal or the chroma signal from which the chroma noise is removed and the luminance signal in the video reproduction signal are respectively processed by the image receiving circuit and synthesized, and then the CRT together with the image signal
It is designed to be displayed above.

[0007]

The 1H delay line according to the present invention separates the luminance signal and the chroma signal from the received composite video signal, while removing the chroma noise from the video reproduction signal, so that the two modes can be used in common. It is possible to reduce the circuit size and cost while obtaining good image quality.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is an antenna of a television receiver,
2 is a tuner connected to the antenna 1, 3 is an intermediate frequency amplifier connected to the tuner 2, 4 is a switch for selecting either the output signal of the intermediate frequency amplifier 3 or an external video input, 5 Is the receiving circuit of the TV receiver,
Reference numeral 6 is a video reproducing device such as a video tape recorder.

Further, 7 is a switch which constitutes the present invention,
Either the composite video signal received by the television or the chroma signal in the video reproduction signal is selected. 8
Is a 1H delay line that separates a luminance signal and a chroma signal from the composite video signal and removes chroma noise from the video reproduction signal.

Further, 9 is a chroma processing circuit for processing the separated and noise-removed chroma signal obtained through the 1H delay line 8, and 10 is a luminance signal and a video reproduction signal obtained through the 1H delay line 8 and the switch 11. Processing circuit for processing the brightness signal in
Is a matrix circuit for performing color reproduction by performing addition / subtraction processing of the obtained luminance signal and R, G, B chroma signals, and 13 is a CRT for displaying the color reproduced image signal.

In the video reproducing device 6, 14 is a chroma processing circuit, 15 is a low-frequency conversion circuit for chroma signals, and 1 is a low-frequency conversion circuit.
6 is a low pass filter, 17 is a luminance processing circuit for luminance signals, 18 is an FM modulation circuit, 19 is a high pass filter, 2
Reference numeral 0 is a mixer circuit for mixing and separating a chroma signal and a luminance signal, and 21 is a video head.

Next, the operation will be described. First, in the mode for receiving television broadcasting, the antenna 1 receives television radio waves, and the tuner 2 performs high frequency amplification and frequency conversion to select a channel. The intermediate frequency converted image intermediate frequency signal is amplified by the intermediate frequency amplifier 3 and then input to the 1H delay line 8 via the switch 7.

In the 1H delay line 8, a luminance signal and a chroma signal are separated from the composite video signal received by the television and output, and the luminance signal is input to the luminance processing circuit 10 of the receiving circuit 5 via the switch 11 to obtain the chroma signal. The signal is directly input to the chroma processing circuit 9. Then, these two signals are subjected to addition / subtraction processing in the matrix circuit 12 and color reproduction is performed, and are output to the CRT 13 together with the image signal (video signal) for display.

On the other hand, the luminance signal and the chroma signal separated by the 1H delay line 8 are respectively the luminance processing circuit 17, the FM modulation circuit 18, the luminance system circuit of the high pass filter 19, the chroma processing circuit 14, and the low frequency conversion circuit. 15,
The signals are supplied to the chroma system circuit of the low-pass filter 16, converted into signals suitable for recording, mixed in the mixer circuit 20, and input to the video head 21. Therefore, it becomes possible to record together with the image signal on a magnetic tape or the like in contact with the video head 21.

On the other hand, in the video reproduction mode in which the magnetic tape is reproduced by the video head, the switches 7 and 1 are used.
1 is switched off, the supply of the television reception signal to the 1H delay line 8 is cut off, and the chroma signal from the video reproduction device 6 is switched to 1
The H delay line 8 and the luminance signal can be supplied to the luminance processing circuit 10.

That is, the chroma signal in the video signal reproduced by the video head 21 is input to the 1H delay line 8 via the mixer circuit 20, the low pass filter 16, the low frequency conversion circuit 15, the chroma processing circuit 14 and the switch 7. The 1H delay line 8 removes the chroma noise, and the chroma noise is input to the chroma processing circuit 9 of the receiving circuit 5.

Similarly, the luminance signal in the video signal reproduced by the video head is subjected to the luminance processing of the receiving circuit 5 via the mixer circuit 20, the high-pass filter 19, the FM modulation circuit 18, the luminance processing circuit 17 and the switch 11. It is input to the circuit 10. Therefore, both of these signals are subjected to addition / subtraction processing in the matrix circuit 12 to reproduce colors, and are output and displayed on the CRT 13 together with the image signals.

As described above, the 1H delay line 8 is used for removing the chroma noise during the reproduction of the video signal and for separating the luminance signal and the chroma signal during the reception of the television, thereby improving the image quality while reducing the circuit scale. The cost can be reduced.

[0019]

As described above, according to the present invention, in a television receiver having a built-in video reproducing device, a switch for selecting one of a composite video signal by television reception and a chroma signal in the video reproducing signal, A luminance signal and a chroma signal are separated from the composite video input through a switch, and a 1H delay line that removes chroma noise from the video neutral signal, and a luminance signal and a chroma signal separated by the 1H delay line, or Since the chroma signal from which the chroma noise is removed and the luminance signal in the video reproduction signal are processed by the receiving circuit and combined and displayed on the CRT together with the image signal, the 1H delay line is displayed in the video reproduction mode. Used as a noise filter, and for luminance / chroma separation when receiving TV. By using Te, suppressed the circuit scale, there is an advantage that it is possible to improve the cost reduction of the image quality.

[Brief description of drawings]

FIG. 1 is a block connection diagram showing a television receiver according to an embodiment of the present invention.

[Explanation of symbols]

 5 Receiver circuit 7 Switch 8 1H delay line 13 CRT

Claims (1)

[Claims] 1. A television receiver having a built-in video reproducing device, comprising: a switch for selecting one of a composite video signal by television reception and a chroma signal in the video reproduction signal; and a composite video signal input through the switch. A 1H delay line that separates a luminance signal and a chroma signal while removing chroma noise from the video reproduction signal, a luminance signal and a chroma signal that are separated by the 1H delay line, or a chroma signal from which the chroma noise is removed, and A television receiver provided with an image receiving circuit for displaying the luminance signal in the video reproduction signal on a CRT after processing and synthesizing the luminance signals.