KR100252995B1 - Digital/satellite broadcast reception of the common equipment - Google Patents

Abstract

PURPOSE: A shared apparatus for receiving a digital/satellite broadcasting is provided to increase the utility efficiency of a chip used to each receiver by holding parts of a digital broadcasting receiver and a satellite broadcasting receiver in common. CONSTITUTION: A digital broadcasting receipt unit(30) receives a broadcasting signal from a ground wave received to an antenna(31), and compensates a changed frequency. A satellite broadcasting receipt unit(40) receives a broadcasting signal from a satellite wave received to a satellite antenna(41), and converts the signal into a low band signal. A selection unit(50) selects a broadcasting signal inputted from the digital broadcasting receipt unit(30) or the satellite broadcasting receipt unit(40). A digital/satellite broadcasting signal processing unit(60) decodes and encodes the broadcasting signal selected from the selection unit(50). A microcomputer(70) controls the selection unit(50) and drives the digital/satellite broadcasting signal processing unit(60)..

Description

Sharing device for receiving digital / satellite broadcasting

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system sharing apparatus, and more particularly, to a sharing apparatus of a satellite broadcasting receiver and a digital broadcasting receiver, which can be installed by sharing terrestrial digital broadcasting and satellite broadcasting with one receiver.

Hereinafter, with reference to the accompanying drawings as follows.

1 is a block diagram illustrating a general digital broadcasting receiver, and FIG. 2 is a block diagram illustrating a general satellite broadcasting receiver.

Referring to FIG. 1, an antenna 1, an analog / digital (A / D) converter 2, a tuner 3, a synchronous recovery unit 4, an equalizer 5, and a preprocessing error correction (FEC) section 6, transport demux section 7, descrambler 8, video decoding section 9, audio decoding section 10, NTSC encoder section 11, It consists of a digital / analog (D / A) converter 12.

The operation of the general digital broadcasting receiver configured as described above is as follows.

After receiving the terrestrial wave received by the antenna 1 from the tuner demodulator 2, the channel to be tuned is selected and the input analog signal is converted into a digital signal.

The compensated frequency is applied to the preprocessing error correction (FEC) unit 5 to perform error correction and output in the form of a digital bitstream.

The transport demux 6 selects and outputs only a corresponding signal by a control signal for a channel selected by a user among bitstream signals.

When the signal output from the transport demux 6 is encrypted (scrambled), the descrambler 7 descrambles (de-encrypts) the output signal to the transport demux 4 again.

The video decoder unit 8 outputs a video signal by restoring only an image of the signal selected and output from the transport demux 6, and restores only the audio of the signal selected and output from the transport demux 6 to output an audio signal. It consists of an audio decoder part 9 which outputs.

The signal output from the video decoder unit 8 is encoded by the NTSC encoder unit 9 and then output as an image, and the signal output from the audio decoder unit 10 is analog by a digital / analog (D / A) converter. It is converted into a signal and output as voice.

In addition, the satellite broadcasting receiver will be described with reference to FIG. 2.

Antenna 13, Low Noise Block (LNB) 14, Microcomputer 15, Tuner 16, Analog / Digital (A / D) Converter 17, QPSK Demodulator 18 A preprocessing error correction (FEC) unit 19, a transport demux unit 20, a descrambler 21, a video decoder unit 22, an audio decoder unit 23, an NTSC encoder unit (24), and a D / A conversion section (25).

A brief description of the operation of a general satellite broadcasting receiver configured as described above is as follows.

First, the satellite broadcast signal of the 11 to 12 GHz frequency band received by the antenna 13 is converted into a local oscillation frequency of the LNB 14 to be converted into a 950 to 2150 MHz frequency band signal and input to the receiver.

Here, the microcomputer 15 of the receiver transmits a repeater selection value having a different value for each repeater to a phase locked loop (PLL) (not shown) inside the tuner 16, so that the repeater corresponding to the channel to be tuned by the user is selected. To be converted to a constant frequency, the intermediate frequency (497.5 MHz).

The signal converted to the intermediate frequency is converted into a baseband signal by the tuner 16, and then converted into a digital signal through the A / D converter 17, and the timing recovery and the carrier recovery are performed by the QPSK demodulator 18. do.

After that, the FEC 19 performs error correction, and the transport demux 20 selects and outputs only the corresponding signal by the control signal corresponding to the channel selected by the user among the corrected signals.

When the signal selected by the transport demux unit 20 is encrypted (scrambled), the descrambler 21 descrambles (decrypts) the output signal to the transport demux 20 again.

Also, the video signal among the signals output from the transport demux 20 is input to the video decoder 22 and decoded, and is encoded by the NTSC encoder 24 to be output as a video signal.

The audio signal of the signal output from the transport demux 20 is input to the audio decoder 23 to be decoded, and is converted into an analog signal by the D / A converter 25 to be output as a voice signal.

In order to simultaneously receive satellite broadcasting and digital broadcasting according to the prior art, the satellite broadcasting receiver and the digital broadcasting receiver must be purchased separately, thereby increasing the purchase cost and reducing the use efficiency of the chip embedded in each receiver. have.

The present invention has been made to solve such a problem, and since the frequency bands are different, the tuner, VSB, and QPSK demodulators are used separately (the tuner can share two systems in one set, and the VSB and QPSK demodulators It is an object of the present invention to provide a sharing device for receiving digital broadcasting / satellite broadcasting.

1 is a block diagram illustrating a digital broadcast receiver according to the prior art.

2 is a block diagram showing a satellite broadcast receiver according to the prior art.

3 is a block diagram showing a sharing device for receiving digital / satellite broadcasting according to the present invention.

<Explanation of symbols for main parts of drawing>

30: digital broadcast receiver 31: terrestrial reception antenna

32,43: tuner 33: analog / digital (A / D) converter

34: VSB 40: satellite broadcasting receiver

41: satellite wave receiving antenna 42: LNB

44: dual analog / digital converter 50: selector

51: first switch 52: second switch

53: QPSK demodulator 60: Digital / satellite broadcasting signal processor

61: preprocessing error correction (FEC) section 61a: Viterbi decoder

61b: Deinterleaver 61c: RC decoder

62: Transport Demux 63: Descrambler

64: video decoder section 65: audio decoder section

66: NTSC encoder section 67: digital / analog (D / A) conversion section

70: micom

The present invention relates to a sharing device for receiving digital / satellite broadcasts. The present invention relates to a digital signal input unit for receiving a terrestrial wave and selecting a channel and compensating for a changed frequency. A satellite signal input unit which is converted and performs timing recovery and carrier recovery, and a sharing unit which receives the digital signal or the satellite signal, performs a preprocessing error correction (FEC), and then transports and decodes the audio signal and the video signal. It has its features.

Hereinafter, with reference to the accompanying drawings as follows.

3 is a block diagram showing a sharing device for receiving digital / satellite broadcasts according to the present invention.

As shown in FIG. 3, a digital broadcast receiver 30 for receiving a broadcast signal from the terrestrial wave received by the antenna 31 and compensating for demodulation, synchronization detection, a change frequency, and the like, and a phase received by the satellite antenna 41. Receiving a broadcast signal from a wave, converting the signal into a baseband signal, and converting the signal into a digital signal; and selecting a broadcast signal input from the digital broadcast receiver 30 or the satellite broadcast receiver 40. A digital / satellite broadcast signal processor 60 which is decoded and encoded according to a decoding method of the broadcast signal selected by the selector 50 and output as a video signal or an audio signal, and the selector 50 ) And the microcomputer 70 for driving the digital / satellite broadcast signal processor 60.

The digital broadcast receiver 30 receives a broadcast signal from a terrestrial wave and selects a tuner 32 and selects a desired channel, and outputs an analog signal output from the tuner 32 as a digital signal. And a VSB 34 for detecting where the actual signal is started from among the digital signals output from the analog / digital (A / D) converter 33 and compensating for the changed frequency. .

The satellite broadcasting receiver 40 converts the satellite broadcast signal of the 11 to 12 GHz frequency band received from the satellite antenna 41 into a local oscillation frequency and converts the satellite broadcast signal into a 950 to 2150 MHz frequency band signal. A tuner 43 for converting to an intermediate frequency corresponding to a channel to be tuned by a user among the repeater preset values received by the LNB 42 and a baseband signal, and a baseband signal converted by the tuner 43. It is composed of a dual A / D converter 44 for converting the post-digital signal.

The selector 50 includes a first switch 51 for selecting a broadcast signal input from a digital broadcast receiver, a second switch 52 for selecting a broadcast signal input from the satellite broadcast receiver, and the second switch. QPSK demodulator 53 is configured to receive the digital signal outputted from and perform timing recovery and carrier recovery.

The digital / satellite broadcast signal processing unit 60 performs error correction on the preprocessing error correction (FEC) unit 61 and the preprocessing error correction (FEC) unit 61, and then applies the control signal for the channel selected by the user. The transport demux 62 outputting only the corresponding signal and the signal deselected by the transport demux 62 are descrambled (decrypted), and the transport demux 62 is again decoded. A descrambler 63 to be outputted to the video output unit, a video decoder unit 64, an audio decoder unit 65, an NTSC encoder unit 66, and a digital / analog (D / A) conversion unit 67.

The preprocessing error correction (FEC) unit 61 includes a Viterbi decoder 61a for minimizing a decoding error probability when symbols are generated with the same probability, and a signal decoded by the Viterbi decoder 61a and input at predetermined intervals. The deinterleaver 61b for arranging the signal into place and the signal outputted from the deinterleaver 61b are output to the RS decoder 61c to correct an error.

The Viterbi decoder 61a is a decoding method for finding a path having the smallest hamming distance by repeatedly selecting a path having the smallest hamming distance among the paths input to each state in the trellis diagram. The theory is similar to the trellis decoder used in the receiver.

In the standard of the RS decoder 61c, the standard in digital broadcasting is (207,187) in which the total length is 207 bytes and actual data occupies 187 bytes, and the satellite broadcasting is (204,188).

Thus, the Viterbi decoder and the trellis decoder can be shared, and the RS decoder can be shared by manipulating parameters using a general purpose RS decoder.

In addition, the deinterleaver 61b may share the memory mapping scheme by modifying the method.

Therefore, the video signal among the signals output from the transport demux 62 is inputted and decoded by the video decoder unit 64, encoded by the NTSC encoder unit 66, and output as an image signal.

In addition, the audio signal among the signals output from the transport demux 62 is input to the audio decoder unit 64 and decoded, and is converted into an analog signal by the digital / analog (D / A) converter 67 to be a voice signal. Will output

Thus, by sharing the rest of the antenna, tuner, VSB, QPSK demodulator, satellite and terrestrial digital broadcasting can be received by one receiver.

The present invention can reduce the manufacturing cost by sharing a part of the digital broadcast receiver and the satellite broadcast receiver, there is an effect that can improve the use efficiency of the chip used in each receiver.

Claims (3)

In the sharing device for receiving digital / satellite broadcasting, a digital broadcasting receiver for receiving, demodulating, and equalizing terrestrial waves, a satellite broadcasting receiver for receiving satellite waves, converting them into baseband signals, and demodulating them, and the digital broadcasting receiver and the satellite broadcasting receiver. A selector for selecting a broadcast signal input from the digital signal, a digital / satellite broadcast signal processor for receiving and decoding a broadcast signal selected by the selector to output a video signal or an audio signal, and controlling the selector to control the digital / satellite broadcast signal. Sharing device for receiving digital / satellite broadcasting, characterized in that the processing unit is configured to output a control signal to drive. The digital signal receiver of claim 1, wherein the selector comprises: a first switch for selecting a broadcast signal input from a digital broadcast receiver; a second switch for selecting a broadcast signal input from a satellite broadcast receiver; and a digital signal output from the second switch. And a QPSK demodulation unit configured to perform timing recovery and carrier recovery. The transformer of claim 1, wherein the digital / satellite broadcast signal processor selects and outputs only a control signal corresponding to a channel selected by a user from among preprocessing error correction (FEC) units and signals corrected by the preprocessing error correction (FEC) unit. A descrambler that descrambles a port demux, a signal output from the transport demux, and outputs the descrambled signal to the transport demux, and receives and decodes a video signal among the signals output from the transport demux A video decoder, an NTSC encoder that encodes the signal decoded by the video decoder, and outputs a video signal, an audio decoder that receives and decodes an audio signal among signals output from the transport demux, and the audio decoder Converts the signal decoded by the analog signal to an analog signal and outputs it as an audio signal. The sharing device for receiving digital / satellite broadcasts, characterized by comprising a digital / analog (D / A) converter.

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