KR19990029456U - TV signal video signal processing device - Google Patents

Abstract

The present invention relates to a video signal processing apparatus of a TVCR with a built-in composite broadcast receiver composed of an off-air tuner and a digital tuner, and the present invention is an NTSC composite video signal and an off-air tuner generated by the digital signal processor 120. The off-air composite video signal received through the selection is recorded by the first switching block 130 in the form of a composite video signal to the deck unit 150. Meanwhile, the off-air video signal of the first color component converted by the off-air signal processor 140 and the NTSC video signal of the second color component generated by the digital signal processor 120 are transmitted by the second switching block 160. It is optionally switched and displayed on the television monitor as R, G, B color components.

Therefore, a circuit configuration for separating and mixing the Y-C signal is unnecessary as in the TVCR having the composite broadcast receiver of the prior art, thereby reducing the cost.

Description

TV signal video signal processing device

The present invention relates to a TVCR with a composite broadcast receiver for receiving satellite and terrestrial broadcast signals, and more particularly, to a video signal processing apparatus of a TVCR with a composite broadcast receiver.

In recent years, the broadcast method using satellites, which is rapidly expanding in use, is a method of providing broadcast signals to a wider area by using satellites (communication satellites) located at an altitude of about several tens to hundreds of kilometers from the surface of the earth. In this satellite broadcasting system, for example, an old band RF signal having a frequency band of 11.7 GHz to 12.0 GHz is used.

To this end, the antenna for satellite broadcasting reception is provided with a low noise blockdown converter for converting a radio frequency (RF) signal of a very high frequency into an intermediate frequency (IF) signal. Is converted into an IF (intermediate frequency) signal in the hundreds to thousands of MHz bands (e.g., 950 MHz-2050 MHz) receivable by the satellite broadcasting receiver. Accordingly, in the satellite broadcasting tuner provided in the satellite broadcasting receiver, the channel selected by the user is tuned by inputting the IF signal received through the low noise converter.

In recent years, digital satellite receivers, such as DSS (Digital Satellite System) MDU (Multi Dwelling Unit) of the United States Direc TV, can be used as a composite tuner that can accommodate both cable and terrestrial broadcasts simultaneously. A system consisting of a receiving tuner has been proposed. This composite tuner has a configuration for selectively tuning satellite broadcast or cable / terrestrial broadcast in accordance with a control signal provided from a control unit.

1 illustrates a configuration of a video signal processing apparatus of a TVCR configured using such a composite tuner.

The off-air tuner 10 receives off-air broadcasts referring to terrestrial broadcasts and cable broadcasts, and the digital tuner block 20 receives digital satellite broadcasts.

The off-air broadcast signal tuned by the off-air tuner 10 is separated into a Y (luminance) signal and a C (color signal) in the YC separation unit 30, and is digitally broadcasted by the digital tuner block 20. The signal is separated into a Y (luminance) signal and a C (color signal) inside.

Each of the Y and C signals separated by the YC separator 30 and the digital tuner block 20 may be selectively processed by the selective switching action of the first and second switches 32 and 34. Is applied to.

The signal processor 40 processes the signals of the R, G, and B color components using the Y and C signals of the selectively input off-air broadcast signal or digital broadcast signal and provides them to the television monitor 60 to provide an image. Display.

Meanwhile, the Y signal and the C signal selectively output from the first and second switches 32 and 34 are mixed in the YC mixer 50 and provided to the deck unit 200 to record off-air or digital broadcast signals. can do.

However, in the case of processing a video signal using the Y signal and the C signal in the TVCR having the above-described configuration, the image quality is better than that of the composite video signal. It may lead to deterioration of image quality rather than doing so.

Therefore, an object of the present invention is to provide a video signal processing apparatus capable of providing better image quality in a TVCR with a built-in broadcast receiver that simultaneously accommodates digital satellite broadcasting and general off-air broadcasting.

In order to achieve the above object, according to the present invention, a video signal processing apparatus of a TVCR equipped with a composite broadcast receiver composed of an off-air tuner and a digital tuner, the off-air composite video signal processing received through the off-air tuner An off-air signal processor for outputting an off-air color video component signal; A digital video signal processor for outputting an NTSC composite video signal and an NTSC color video component signal from the digital broadcast signal received through the digital tuner; A first switch block configured to receive the off-air composite video signal received through the off-air tuner and the NTSC composite video signal of the digital video signal processor, and selectively switch these signals according to a first switching control signal; A tech unit for recording an NTSC composite video signal or an off-air composite video signal selected by the first switch block; Receive the NTSC color video component signal of the digital video signal processor and the off-air color video component signal of the off-air signal processor, and receive the received NTSC color video component signal and the off-air according to a second switching control signal. And a second switching block for selectively switching the color video component signal to output to the television monitor.

1 is a diagram showing a video signal processing configuration of a TVCR incorporating a composite broadcast receiver according to the prior art;

2 is a block diagram of a video signal processing apparatus of a TVCR with a composite broadcast receiver constructed according to the present invention;

<Description of the code | symbol about the principal part of drawing>

110: off-air tuner 120: digital signal processing unit

130: first switching block 140: off-air signal processing unit

150: deck portion 160: second switching block

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an on-screen display control apparatus for a television configured according to a preferred embodiment of the present invention, which includes an off-air tuner 110, a digital tuner block 115, a digital video signal processor 120, and an off-air controller. An air signal processor 140 and a deck unit 150 are provided.

The off-air tuner 110 selectively tunes the off-air broadcast channel provided through the antenna or the transmission path based on the tuning control signal, and converts the tuned off-air broadcast channel into a baseband composite video signal. The first output terminal 132 and the off-air signal processor 140 of the first switching block 130 are output.

The off-signal processing unit 140 processes the composite video signal output from the off-air tuner 110 to output the first input terminal of the second switching block 160 as an off-air signal of R, G, and B color components. 162, 164, 166, respectively.

On the other hand, the digital tuner block 115, like the off-air tuner 110, selectively tunes the digital satellite broadcast channel provided through the antenna or the transmission path based on the tuning control signal, and receives from the tuned digital broadcast channel. The digital broadcast signal to the digital signal processor 120.

The digital signal processing unit 120 is a means including an MPEG decoder, an NTSC encoder, and the like. The digital signal processor 120 demodulates a digital broadcast signal into an original digital signal before broadcasting and combines a composite video signal of an NTSC (or PAL) method and an R, G, and B color component. Generated as an NTSC video signal. In addition, the digital signal processor 120 according to the present invention generates a second switching signal for controlling the second switching block 160 described below. The NTSC composite video signal generated by the digital signal processor 120 is applied to the second input terminal 134 of the first switching block 130, and the NTSC color (R, G, B) component video signal is the second switching block. Are applied to the second input terminals 172, 174, 176 of 160, respectively.

The first switching block 130 is applied to its first input terminal and the second input terminal 132, 134 by switching its switching contact 136 in response to a first switching control signal provided from an unillustrated control. The off-air composite video signal and the NTSC composite video signal are selected and output to the deck unit 150. Accordingly, the deck unit 150 records the off-air composite video signal or NTSC composite video signal selected by the first switching block 130 in the form of a composite video signal.

Meanwhile, the second switching block 160 is output from the off-air signal processor 140 by switching its switching contacts 182, 184, and 186 according to the second switching control signal provided from the digital signal processor 120. An off-air video signal of the R, G, and B color components and an NTSC video signal of the R, G, and B color components output from the digital signal processing unit 120 are selected to display a video signal of the R, G, and B color components. Output to 180.

Thus, television monitor 180 optionally displays off-air broadcast signals or digital broadcast signals using video signals of R, G, and B color components.

As described above, when displaying satellite broadcasts and off-air broadcasts in a TVCR according to the present invention, by using video signals of R, G, and B color components, playback is performed in comparison with a method using Y and C signals as in the prior art. It is possible to bring about an improvement in image quality and to reduce the circuit configuration for separating and synthesizing the Y and C signals.

Claims (1)

In the video signal processing apparatus of a TVCR with a built-in composite broadcast receiver composed of an off-air tuner and a digital tuner, An off-air signal processor 140 for processing an off-air composite video signal received through the off-air tuner and outputting the off-air color video component signal; A digital video signal processor (120) for outputting an NTSC composite video signal and an NTSC color video component signal from the digital broadcast signal received through the digital tuner; A first switch receiving the off-air composite video signal received through the off-air tuner and the NTSC composite video signal of the digital video signal processor 120 and selectively switching these signals according to a first switching control signal Block 130; A tech unit 150 for recording an NTSC composite video signal or an off-air composite video signal selected by the first switch block 130; Receives the NTSC color video component signal of the digital video signal processor 120 and the off-air color video component signal of the off-air signal processor 140, and receives the received NTSC color video component according to a second switching control signal. And a second switching block (160) for selectively switching the signal and the off-air color video component signal to a television monitor.