KR100254498B1 - Multiple receiver for digital broadcasting signal - Google Patents

Abstract

PURPOSE: A multi digital broadcasting receiver is provided to simplify hardware of whole system by adequately processing a digital satellite broadcasting. a digital CATV broadcasting and a digital ground wave broadcasting with one receiver using one integrated circuit. CONSTITUTION: A multi digital broadcasting receiver is composed of a digital satellite tuner and demodulation unit(11), a digital CATV tuner and demodulation unit(12), a digital ground wave tuner and demodulation unit(13), a signal conversion unit(20), a microcomputer(30), a key input unit(40), an error correction unit(50), a demultiplexer(60), an MPEG decoder(70), a video encoder(80) and an audio DAC(90). The digital satellite tuner and demodulation unit(11) tunes a satellite signal provided from a satellite antenna under the control of the microcomputer(30). The unit(11) demodulates the signal of a channel tuned and provides the signal to the signal conversion unit(20). The digital CATV tuner and demodulation unit(12) tunes a broadcasting signal transmitted under the control of the microcomputer(30). The digital ground wave tuner and demodulation unit(13) tunes a digital ground wave broadcasting signal. The signal conversion unit(20) switches each broadcasting signal provided from each tuner and demodulation unit(11,12,13).

Description

MULTIPLE RECEIVER FOR DIGITAL BROADCASTING SIGNAL}

The present invention relates to a digital satellite broadcast receiver, and more particularly, to a multiple digital broadcast receiver suitable for receiving both satellite signals, digital CATV signals and digital terrestrial broadcast signals.

As is well known, digital satellite broadcasts receive broadcast signals from ground stations (broadcasting earth stations) using broadcast satellites floating on stationary orbits of several kilometers (eg, 35,786 kilometers) above the equator, where each satellite receives them. It is a broadcasting system that can receive directly with a receiving antenna.

Such digital satellite broadcasting expands the range of information selection compared to existing digital terrestrial or cable broadcasting, and simplifies the handling method to provide detailed information such as graphics, still images, text, graphics, still images, and the like. 'Facsimile service' function that broadcasts information such as figure and picture on paper, 'Audio graphic' function that broadcasts a combination of high definition still image and high quality voice, channel ID, program name, program contents It includes a variety of services, such as the 'program guide service' function that informs the presence or absence of broadcast time.

The digital satellite broadcasting receiver used in such a digital satellite broadcasting system refers to a device that receives a bitstream provided from a satellite, processes a broadcast signal of a selected channel through a predetermined process, and then displays the signal.

FIG. 1 is a block diagram showing a schematic configuration of a conventional general digital satellite broadcasting receiver, and includes a microcomputer 15, a tuner and a demodulator 25, an MPEG decoder 35, a video encoder 45, and an audio DAC. 55, a memory unit 65 is included.

The microcomputer 15 generates each control signal for performing a corresponding function based on a key signal from a key input means not shown, for example, a remote controller or a keypad on its own panel. Based on the key signal for channel selection from the key input means, the control signal for tuning the bitstream of the corresponding channel is generated.

The tuner and demodulator 25 tunes and then demodulates the bitstream of the channel corresponding to the control signal for tuning from the microcomputer 15 in the bitstream from the satellite signal received through the antenna (not shown). The microcomputer 15 detects various types of information from the satellite signals received by the tuner and the demodulator 25 through the antenna and stores the information in the memory unit 65.

Meanwhile, the MPEG decoder 35 decodes a broadcast signal of a channel tuned and tuned by the tuner and the demodulator 25, and separates the broadcast signal into an audio signal and a video signal, and then, respectively, the video encoder 45 and the audio DAC 55. Will be provided.

The video encoder 45 converts the digital video signal of the frame unit provided from the MPEG decoder 35 into an NTSC or PAL video signal and displays it on a monitor (not shown), and the audio DAC 55 displays the MPEG decoder 35. The digital audio signal decoded from) is converted into an analog signal and output to a speaker (not shown).

In the general digital satellite broadcasting receiver configured as described above, tuning is possible only for satellite signals received from a satellite antenna (not shown). Therefore, when a user wants to receive both digital satellite broadcasting, digital CATV broadcasting, and digital terrestrial broadcasting, As a result of having to install a separate receiver, there is a problem that the hardware of the entire system is consequently complicated, resulting in an increase in manufacturing cost.

Accordingly, the present invention is to solve the above-mentioned problems of the prior art, it is possible to adaptively process digital satellite broadcasting, digital CATV broadcasting, and digital terrestrial broadcasting by using a single integrated processing circuit with one receiver. Its purpose is to provide a multiple digital broadcast receiver.

In order to achieve the above object, the present invention provides a digital broadcast receiver that can accommodate a digital satellite broadcast signal, a digital CATV broadcast signal, and a digital terrestrial broadcast signal, based on each tuning control signal according to a user selection. A broadcast receiving block comprising a satellite tuner for tuning and demodulating a selected channel, a digital CATV tuner for tuning and demodulating a selected channel of the digital CATV broadcast, and a terrestrial tuner for tuning and demodulating the selected channel of the terrestrial broadcast; Generating a tuning control signal for selectively performing tuning of each tuner in response to a channel selection signal from an external source, and generating a switching control signal for switching the output of a broadcast channel tuned by a selected tuner among the respective tuners, A control block for performing various controls for signal processing of the tuned broadcast channel; An output switching block for selecting an output of a tuned broadcast channel among the tuners in response to the switching control signal provided from the control block; An error correction block for correcting an error on the output of the tuned broadcast signal; An MPEG decoder which separates the output of the tuned broadcast signal into an audio signal and a video signal and decodes the same through a signal processing process; A video encoder for converting and encoding a video signal among the tuned broadcast signals into an analog video signal, and an audio DAC for converting an audio signal among the tuned broadcast signals into an analog audio signal are provided.

1 is a block diagram showing a schematic configuration of a conventional general digital satellite broadcasting receiver;

2 is a block diagram showing the configuration of a multiple digital broadcast receiver according to a preferred embodiment of the present invention.

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

11: digital satellite tuner and demodulator 12: digital CATV tuner and demodulator

13 digital terrestrial tuner and demodulator 20 signal switching unit

30: micom 40: key input unit

50: error correction unit 60: demultiplexer

70: MPEG Decoder 80: Video Encoder

90: Audio DAC

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings.

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

2 is a block diagram showing the configuration of a multiple digital broadcast receiver according to a preferred embodiment of the present invention. The digital satellite tuner and demodulator 11, the digital CATV tuner and demodulator 12, and the digital terrestrial tuner and demodulator are shown in FIG. Grandfather 13, signal switching unit 20, microcomputer 30, key input unit 40, error correction unit 50, demultiplexer 60, MPEG decoder 70, video encoder 80, audio DAC ( 90).

The digital satellite tuner and demodulator 11 tunes the satellite signal provided from the satellite antenna not shown by the control of the microcomputer 30, demodulates the signal of the tuned channel, and provides the signal to the signal conversion unit 20. The digital CATV tuner and demodulator 12 tunes the broadcast signal transmitted from the transmitting side via the coaxial cable under the control of the microcomputer 30, and demodulates the broadcast signal of the tuned digital CATV through a predetermined process. .

The digital terrestrial tuner and demodulator 13 also tunes the digital terrestrial broadcast signal provided through a digital terrestrial antenna, not shown, and demodulates the tuned broadcast signal to provide it to the signal switcher 20.

On the other hand, the signal switching unit 20 switches the respective broadcast signals provided from the respective tuners and demodulators 11, 12, and 13 based on the control signals of the microcomputer 30, thereby providing respective lines L16 and L17. And one broadcast signal selected from among the broadcast signals provided from L18.

The configuration and operation process of the multi-digital digital broadcast receiver according to the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the multiple digital broadcast receiver configured as described above, when a user inputs a key signal for receiving a digital satellite broadcast through the key input unit 40, the microcomputer 30 responds to the input key signal. The selection control signal is generated and provided to the signal switching unit 20.

The signal switching unit 20 selects and outputs the digital satellite broadcast signal input through the line L16 based on the selection control signal of the microcomputer 30, and at this time, the selected digital satellite broadcast signal is an error correction unit. The error is compensated for by 50 and then provided to the demultiplexer 60.

The demultiplexer 60 demultiplexes the digital satellite broadcast signal whose error is compensated by the error correcting unit 50 under the control of the microcomputer 30, and then provides the demultiplexer 60 to the MPEG decoder 70. The broadcast signal provided from the demultiplexer 60 is decoded into an audio signal and a video signal, and then output to the video encoder 80 and the audio DAC 90, respectively.

Therefore, the video signal and the audio signal of the digital satellite broadcast signal received from the satellite antenna not shown are output by the video encoder 80 and the audio DAC 90, respectively.

On the other hand, when the user inputs the key signal for receiving the digital CATV broadcast again through the key input unit 40 through the key input unit 40, the microcomputer 30 responds to the input key signal to select control corresponding thereto. The signal is generated and provided to the signal switching unit 20.

The signal switching unit 20 selectively outputs the digital CATV broadcast signal input through the line L17 based on the selection control signal of the microcomputer 30, and the digital CATV broadcast signal selected and output is the above-described digital signal. After processing through the same process as the processing for the satellite broadcast signal is output through the video encoder 80 and the audio DAC (90).

Meanwhile, when the user inputs a key signal for receiving the digital terrestrial broadcast through the key input unit 40, the microcomputer 30 also applies a selection control signal to the signal switching unit 20 based on the input key signal. As a result, the signal conversion unit 20 outputs only the digital terrestrial signal input through the line L18.

The digital terrestrial broadcast signal is output through the video encoder 80 and the audio DAC 90 after the same process as the above-described satellite signal and digital CATV signal processing.

As described above, according to the present invention, the digital satellite broadcasting, the digital CATV broadcasting, and the digital terrestrial broadcasting receiver can adaptively process each broadcasting signal using one signal processing circuit, thereby greatly simplifying the hardware of the entire system. In addition, there is an effect that can significantly reduce the manufacturing cost of the product.

Claims (1)

A digital broadcast receiver capable of receiving a digital satellite broadcast signal, a digital CATV broadcast signal, and a digital terrestrial broadcast signal, A satellite tuner for tuning and demodulating a selected channel of the digital satellite broadcasting, a digital tuner tuner for tuning and demodulating a selected channel of the digital CATV broadcasting, and a selected channel of the terrestrial broadcasting, based on each tuning control signal according to a user selection. A broadcast receiving block comprising a terrestrial tuner for tuning and demodulating the signal; Generating a tuning control signal for selectively performing tuning of each tuner in response to a channel selection signal from an outside, and generating a switching control signal for switching the output of a broadcast channel tuned by a selected tuner of each tuner; A control block for performing control for signal processing of the tuned broadcast channel; An output switching block for selecting an output of a tuned broadcast channel among the tuners in response to the switching control signal provided from the control block; An error correction block for correcting an error on the output of the tuned broadcast signal; An MPEG decoder which separates the output of the tuned broadcast signal into an audio signal and a video signal and decodes the same through a signal processing process; And a video encoder for converting and encoding a video signal among the tuned broadcast signals into an analog video signal, and an audio DAC for converting an audio signal among the tuned broadcast signals into an analog audio signal.

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