KR20020018231A - Multi digital broadcasting receiver - Google Patents

Abstract

PURPOSE: A multi digital broadcast receiver is provided to receive all kinds of digital broadcasts with one receiver. CONSTITUTION: A multi digital broadcast receiver includes a satellite broadcast receiver(10), a tuner(20), a cable broadcasting signal demodulator(30), a ground wave broadcasting signal demodulator(40), a digital signal processor(50), and a power switch(60). The satellite broadcast receiver tunes a broadcasting signal of a selected channel to convert the signal into a baseband signal, QPSK-demodulates the baseband signal to convert the signal into a digital signal, and corrects errors in the digital signal. The tuner receives a cable broadcasting signal and a ground wave broadcasting signal to tune a selected channel. The cable broadcasting signal demodulator demodulates the cable broadcasting signal through QAM method. The ground wave broadcasting signal demodulator demodulates the ground wave broadcasting signal. The digital signal processor MPEG-decodes a digital signal inputted from one of the satellite broadcast receiver, the cable broadcasting signal demodulators and the ground wave broadcasting signal demodulator, and encodes the decoded signal into the original video and audio signals.

Description

Multi-digital broadcasting receiver {MULTI DIGITAL BROADCASTING RECEIVER}

The present invention relates to a receiver for receiving and processing digital broadcasts broadcast through satellite, cable, or terrestrial wave, and more particularly, digital satellite broadcast reception, digital cable broadcast reception, and digital terrestrial broadcast reception can be performed in one receiver. It relates to a digital broadcast receiver.

In digital broadcasting, a digital signal is converted into a video signal and a voice signal instead of an analog signal, and then the digital and audio signals are carried on a satellite signal, a cable signal, or a terrestrial signal. In order to do this, a digital satellite broadcast receiver, a digital cable broadcast receiver, or a digital terrestrial broadcast receiver should be provided for each broadcast type.

Since satellite, cable, and terrestrial broadcasters are broadcasting different contents through different channels, more information is available and more than one type of broadcast is required to satisfy various tastes by family members. Terrestrial broadcasting, satellite broadcasting and cable broadcasting must all be heard, and such assumptions are increasing.

However, since the digital satellite broadcast receiver, the digital cable broadcast receiver, and the digital terrestrial broadcast receiver have been commercialized and sold in the form of independent set-top boxes, the viewers can receive the corresponding broadcast in order to view their desired broadcast. There was an inconvenience to purchase all the receivers.

In other words, if you want to listen to satellite broadcasting, terrestrial broadcasting and cable broadcasting, you need to install three receivers separately, such as digital satellite broadcasting receiver, digital cable broadcasting receiver and digital terrestrial broadcasting receiver. There is a problem that this becomes large, and there is also an inconvenience that the viewer must operate each of the three receivers when using.

SUMMARY OF THE INVENTION The present invention has been invented to solve the above-mentioned conventional problems, and an object thereof is to provide a multi-digital broadcast receiver capable of simultaneously receiving and watching digital broadcasts with one receiver regardless of the broadcast type.

1 is a block diagram showing the configuration of a multi-digital broadcast receiver according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: satellite broadcasting receiver (10)

20 tuner

30: cable broadcasting signal demodulator

40: terrestrial broadcast signal demodulator

50: digital signal processing unit

60: power switching unit

As a construction means for achieving the above object of the present invention, the multi-digital broadcast receiver according to the present invention

A satellite broadcast receiver which selects a broadcast signal of a selected channel among satellite broadcast signals input from the outside, converts it into a baseband signal, converts the baseband signal into a digital signal by converting it into a digital signal, and then corrects and outputs the error;

A tuner which receives the cable broadcasting signal and the terrestrial broadcasting signal input from the outside, selects the selected channel, and converts it to the set frequency;

A cable broadcast signal demodulator for demodulating the cable broadcast signal among the signals output from the tuner in a QAM method and correcting the error as a digital signal;

A terrestrial broadcast signal demodulator for demodulating and error-correcting the terrestrial broadcast signal among the signals output from the tuner, and outputting it as a digital signal;

A digital signal processor for encoding the digital signal input from one of the satellite broadcast receiver, the cable broadcast signal demodulator, and the terrestrial broadcast signal demodulator after MPEG decoding into an original video signal and an audio signal;

And a power switching unit operating under the control of the digital signal processing unit and selectively applying operating power to the satellite broadcasting receiver, the cable broadcast signal demodulator, and the terrestrial broadcast signal demodulator.

As described above, according to the present invention, a digital broadcasting receiver receives a broadcast signal of a channel that is largely tuned regardless of its broadcasting type, and extracts the digital signal, and decompresses the digital signal extracted from the channel unit. It consists of a source section for restoring a digital video signal and a digital audio signal. The channel section is different because of differences in broadcast types, but the configuration is similar to the source section.

Hereinafter, the configuration and operation of a multi-digital broadcast receiver according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a configuration of a multi-digital receiver according to the present invention, wherein the receiver tunes a broadcast signal of a selected channel among satellite broadcast signals input from a satellite reception antenna (not shown) to convert the broadcast signal into a baseband signal. Satellite broadcasting receiver 10 which demodulates baseband signal into digital signal by QPSK method with error correction, and tuner 20 which receives cable broadcasting signal and terrestrial broadcasting signal and tunes selected channel to convert to baseband signal. And a cable broadcast signal demodulator 30 for demodulating and error-correcting the cable broadcast signal among the broadcast signals tuned through the tuner 20 into a digital signal according to the QAM method, and the terrestrial wave among the broadcast signals tuned through the tuner 20. A terrestrial broadcast signal demodulator 40 for demodulating and error correcting a digital signal from a broadcast signal; and the satellite broadcast receiver 10 and a cable broadcast signal demodulator 3 0) and the digital signal processor 50 for restoring the digital signal input from one of the terrestrial broadcast signal demodulator 40 to the original video digital signal and the audio digital signal by the MPEG method, and the digital signal processor 50 of the digital signal processor 50. A power switching unit 60 which operates under control and selectively applies operating power to the satellite broadcasting receiver 10, the cable broadcast signal demodulator 30, and the terrestrial broadcast signal demodulator 40 is provided.

In the above, the digital signal processing unit 50 includes an MPEG decoder for restoring video and audio digital data from a digital signal, a demultiplexer for extracting a transport stream from the digital signal, and video and audio data restored by the MPEG decoder. And a CPU for controlling the overall operation, and have the same configuration and operation as the source portion of the conventional digital broadcast receiver described above.

Next, the operation of the above-described multi-digital broadcast receiver will be described.

When the viewer selects a channel to be watched, for example, selecting a channel by operating a remote controller or an operation panel, the viewer recognizes the channel and controls the power switching unit 60 by the CPU of the digital signal processor 50.

Power supply switching unit 60 is switched by the control of the digital signal processor 50, the operation power applied to each of the satellite broadcasting receiver 10, cable broadcast signal demodulator 30, terrestrial broadcast signal demodulator 40 In more detail, if the channel selected by the viewer is a satellite broadcast channel, the power of the satellite broadcast receiver 10 is turned on and the cable broadcast signal demodulator 30 and the terrestrial broadcast signal demodulator 40 are turned on. The power is turned off, and if the channel selected by the viewer is a cable broadcast channel, the cable broadcast signal demodulator 30 is turned on and the satellite broadcast receiver 10 and the terrestrial broadcast signal demodulator 40 are turned off. When the channel selected by the viewer is a terrestrial broadcast channel, the satellite broadcast receiver 10 and the cable broadcast signal demodulator 30 are turned off, and the terrestrial broadcast signal demodulator 40 is turned off.

The tuner 20 operates together with the cable broadcast signal demodulator 30 or the terrestrial broadcast signal demodulator 40 to operate in tune with the selected broadcast signal, and frequency down the tuned broadcast signal to the set frequency band. do.

Therefore, when the satellite broadcast channel is selected, the satellite broadcast receiver 10 operates to tune the satellite broadcast signal input from the outside, perform QPSK demodulation and error correction, and output the digital signal to the digital signal processor 50. When the cable broadcast channel is selected, the terrestrial broadcast signal demodulation unit 30 operates to tune the signal tuned and tuned by the tuner 20, QAM demodulates the error, and outputs the digital signal. In addition, when the terrestrial broadcast channel is selected, the terrestrial broadcast signal demodulator 40 operates to demodulate the terrestrial broadcast signal tuned and tuned by the tuner 20 into a digital signal, and outputs an error correction.

As described above, the digital signal output from the satellite broadcasting receiver 10, the terrestrial broadcast signal demodulator 30, or the terrestrial broadcast signal demodulator 40 is input to the digital processor 50, and after the MPEG decoding, the original video and audio signals are received. It is converted to and transmitted to an externally connected TV.

As described above, the present invention can receive all digital satellite broadcasts, digital cable broadcasts, and digital terrestrial broadcasts in one multi-digital broadcast receiver according to the present invention, thereby eliminating the need for a separate receiver as in the prior art. It is an excellent effect to reduce the installation cost and installation space, and to facilitate the viewer's convenience.

Claims (1)

A satellite broadcast receiver (10) which tunes a broadcast signal of a selected channel among satellite broadcast signals input from the outside, converts it into a baseband signal, converts the baseband signal into a digital signal, converts it into a digital signal, and then corrects and outputs the error; A tuner 20 which receives a cable broadcasting signal and a terrestrial broadcasting signal input from the outside, selects a selected channel, and converts the selected channel into a set frequency; A cable broadcast signal demodulator (30) for demodulating the cable broadcast signal among the signals output from the tuner (20) using a QAM method and then correcting the error as a digital signal; A terrestrial broadcast signal demodulator 40 for demodulating and error-correcting the terrestrial broadcast signal among the signals output from the tuner 20 and outputting it as a digital signal; Digital signal processing unit for encoding the digital signal input from one of the satellite broadcast receiver 10, the cable broadcast signal demodulator 30 and the terrestrial broadcast signal demodulator 40 into the original video signal and audio signal after MPEG decoding ( 50) and, A power switching unit 60 operating under the control of the digital signal processing unit 50 to selectively apply operating power to the satellite broadcasting receiver 10, the cable broadcast signal demodulator 30, and the terrestrial broadcast signal demodulator 40. Multi-digital broadcast receiver, characterized in that consisting of.