KR0162369B1 - Multi-channel digital satellite broadcasting receiver and method of controlling the same - Google Patents

Abstract

The multi-channel digital satellite broadcasting receiver of the present invention selectively selects a first decoder unit for tuning a corresponding channel according to a control signal of each TV according to a user's selection, and channel data tuned by the first decoder unit to the corresponding TV. And an output selector for transmitting and a second decoder for receiving the tuned channel data for each TV and converting the video and audio signals to be used in the TV, and prevents duplication of circuits. By connecting the selected channel data for each TV through the TV, the TV can be individually selected.

Description

Multi-channel digital satellite broadcasting receiver and control method

1 is a block diagram of a digital satellite broadcasting receiver according to the prior art.

2 is a detailed block diagram of the system decoder of FIG.

3 is a structural diagram of a system transport packet stream.

4 is a flowchart illustrating a method of controlling the system decoder of FIG. 2;

5 is a block diagram of a first embodiment of a multi-channel digital satellite broadcasting receiver according to the present invention;

6 is a block diagram of a second embodiment of a multi-channel digital satellite broadcasting receiver according to the present invention;

7 is a detailed configuration diagram of the Fig. 6 PIP control unit.

8 is a flowchart illustrating a method of controlling the system decoder of FIG. 5;

* Explanation of symbols for main parts of the drawings

20, 50: 1st decoder part 30, 100: 2nd decoder part

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital satellite broadcasting receiver, and more particularly, to a multi-channel digital satellite broadcasting receiver and a method of controlling the same so that multiple TVs can receive different channels for one receiver.

Conventional digital satellite broadcast receivers, as shown in FIG. 1, are for demodulating and error-correcting satellite broadcast reception signals downed through a low noise block down converter (LNB) 1. One channel of the channel 3 and the data transmitted from the channel unit 3, that is, one of several channels transmitted in packet units of 188 bytes as shown in FIG. System decoder to decode transmission packet header 18 in order of sync byte, 3 bits of control bits, 13 bits of program ID, and 8 bits of control bit Section 5 and a source decoder section 7 for decoding the video and audio signals of the channel data selected from the system decoder section 5 in accordance with the Moving Picture Experts Group 2 (MPEG2) standard for use in a real TV. Can be configured as a built-in or set-up box Adapted to be inputted to the eyibeuyi (A / V) of a television terminal, for each configuration parts of detailed configuration is as follows.

First, the channel unit 3 includes a tuner 3 'for tuning the signal down from the LNB, a quadrature phase shift keying (QPSK) demodulator 3, and Viterbi decoding (Viterbi) for minimizing an error. decoding, RS decoding, and descrambling are performed in series to recover the data initially transmitted by the transmitter, and consists of a Forward Error Correction (FEC) 3 ', and the system decoder 5 is shown in FIG. As shown, a first in first out (FIFO) 16 for temporarily storing system stream information in the form of packets output from the channel unit 3, and a remote for selecting channels. Micro for reading the adjustment control unit 17 and the channel tuned by the remote control control unit 17 and transmitting channel selection information, that is, program ID (PID), to the digital signal processing unit (DSP). Computer 14 and the microcomputer The video decoder unit 9 and the audio decoder unit 11 select only packets that match the program IDs in the head portion of the system stream information in the form of packets stored in the first-in-first-out unit 16 among the program IDs received from the program unit 14. A digital signal processor 13 for outputting the digital signal processor 13, a memory unit 15 for storing a program coder for the digital signal processor 13 to perform an operation in the system decoder 5, and the digital signal processor 13 ) Consists of PAL (Phase Alternation by Line) 12 for generating a control signal required for reading data from the first-in first-out section 16 and reading and writing data to the source decoder section 7. The source decoder unit 7 receives a video decoder 9 'for restoring the compressed video data and an NTSC encoder for outputting an NTSC signal by receiving the restored video data from the video decoder 9'. The video decoder unit 9 comprising a 9, an audio decoder 11 'and a digital / analog converter 11 for receiving and restoring audio data from the data transmitted from the channel unit 3; The audio decoder unit 11 is configured as follows.

First, the signal transmitted after being modulated by QPSK is error detection corrected by four programs per channel passing through the channel part, and one of the four programs is demultiplexed and sent to the source decoder part through a system decoder. As shown in FIG. 4, after initializing the digital signal processing unit and various decoders, the transmission packet is decoded to transmit data of program ID if the program ID is a desired channel. Otherwise, data is read again from the first-in first-out unit.

However, the conventional satellite broadcasting receiver has a wide bandwidth of 27 megabytes, which is error-corrected through the channel unit and stored in the first-in, first-out unit, but in actual use, only one program is used to discard other program data. In case of receiving satellite broadcasting by connecting video output from NTSC encoder to several different TV AV (A / V) terminals, other TV except satellite TV receiver can use other remote control program. Since TV cannot be tuned, satellite TV receivers must be installed for each TV. Accordingly, the price competitiveness of the TVs is overlapped.

Accordingly, an object of the present invention is to provide a multi-channel satellite broadcasting receiver for enabling individual selection for each TV by connecting the channel data selected for each TV through the channel selection unit.

Another object of the present invention is to provide a multi-channel satellite broadcasting receiver for allowing individual selection for each TV without repetition of unnecessary circuits by connecting only the decoder unit for audio and video signal processing, but connecting as many channels.

Another object of the present invention is to provide a control method for effectively controlling the multi-channel satellite broadcasting receiver.

The multi-channel satellite broadcasting receiver of the present invention for achieving the above object comprises a first decoder unit for tuning the corresponding channel according to a control signal of each TV according to a user's selection, and a channel data tuned by the first decoder unit. And an output selector for selectively transmitting the TV to a TV, and a second decoder for receiving the TV channel data and converting the TV into a video and audio signal that can be used in the TV.

The multi-channel satellite broadcasting receiver of the present invention for achieving the above another object is connected to a first decoder unit for tuning two or more channels to output through different output ports, one to one correspond to each TV, respectively, A second decoder comprising a plurality of decoders for receiving tuned channel data and converting them into video and audio signals usable in a TV; and a sub-screen control unit for selecting and outputting a conventional TV signal and a satellite broadcast signal. Characterized in that configured.

The control method of the multi-channel satellite broadcasting receiver of the present invention for achieving the another object, the process of initializing the digital signal processing unit and various decoders, decoding the transmission packet, if the program ID is the selected channel or additional selection channel image and And transmitting data to a corresponding decoder for decoding voice, and reading another transmission packet if the program ID is not the selection channel and the additional selection channel.

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

In the first embodiment, as shown in FIG. 5, the multi-channel satellite broadcasting receiver of the present invention includes a first decoder unit 20 for tuning a corresponding channel according to a control signal of each TV by a user's selection. And an output selector 27 for selectively transmitting channel data selected by the first decoder 20 to a corresponding TV, and a video and audio signal that can be used in a TV by receiving the selected channel data for each TV. The first decoder unit 20 is configured as a setup box, and the first-in first-out unit 25 for temporarily pausing the system stream information as a setup box. The microcomputer 21 for selecting and reading channels according to the selection of the microcomputers 42 and 42 'and transmitting the channel selection information to the digital signal processing unit 22, and the program received from the microcomputer 22. Digital signal processing unit 22 for outputting the system stream information in the form of packets stored in the first-in first-out unit 25 of the RAM ID that matches only the program ID in the head portion and outputs the packet to the second decoder unit 3; And a memory unit 24 comprising a PROM storing a program coder, and a PAL 23 for generating a control signal required when the digital signal processor 22 reads and writes data. The selector 27 selects each TV according to a control signal of the microcomputer 21 by using a demultiplexer, and the second decoder 30 is built-in and is output from the first decoder 20. An audio / video decoder 31 and an NTSC encoder 32 for converting signals are connected and configured for each TV, and each TV 40 selects a signal transmitted from the second decoder. The AV switch 41 for connection to each other and the selection by the remote controller for selecting a channel and various control selections for each TV to the microcomputer 21 of the first decoder unit 2 and the AV switch 41 A microcomputer 42 for controlling) is connected.

In operation of the multi-channel satellite broadcasting receiver, when the satellite broadcasting reception signal is demodulated and error-corrected and input to the first decoder unit, the digital signal processor 22 temporarily stores a program stream for a program tuned by TV. The first-in-first-out section 25 reads the data, and decodes 4 bytes of the transmission packet header, where the synchronous bytes appearing every 188 bytes are found, and after the coding of the header byte is completed, the program received from the microcomputer 21 Compare audio ID with non-ID ID and program ID for.

At this time, the digital signal processor 22 sequentially tunes each TV whether the programs are tuned by each of the four TV microcomputers 42 through the microcomputer 21 according to an algorithm stored in the memory unit 25. The 184-byte pay stored in the first-in, first-out section 25 in the order selected by the microcomputer 21 is compared with the four types of program selection sent from the microcomputer 42 by storing the ID. A pay load is sent to the TV-specific audio / video decoder 31 through the demultiplexer 27, which is the microcomputer 21 or the digital signal processor 22 as a 2-bit control signal. Controlled to ensure that the correct bit stream enters each audio / video decoder 31.

The PAL 23 generates a control signal required when the digital signal processor 22 reads data from the first-in, first-out part 25 and reads and writes the audio / video decoder 31. Thus, the demultiplexer ( The program distributed in 19), that is, the tuned program, finally outputs an NTSC signal through the second decoder unit 3 connected to each TV.

Meanwhile, as shown in FIG. 6, the multi-channel satellite broadcasting receiver of the second embodiment includes a first decoder unit 50 for tuning two or more channels and outputting them through different output ports, and one to one for each TV. A plurality of decoders, i.e., video decoders 54 and 54 'and audio decoders 56 and 56', which are connected to correspond to each other and are converted into video and audio signals which are tuned to To output an image by selecting a plurality of second decoder units 100 including a plurality of additional decoders 56 and 56 'and an NTSC encoder 57 and 57' as a decoder unit, and a conventional TV signal and a satellite broadcasting signal. A low frequency amplifier 58, 58 'for receiving a voice signal from the NTSC encoders 57 and 57', and a low frequency amplifier 58 and 58 'for amplifying low frequencies. Through the generator and the sub-screen control unit 61 The mixing unit 62 for mixing the input main signal and the sub-signal, and the image signal amplifying unit 64 for amplifying the actual image to be output to the color processing unit 63 and the CRT 65 for RGB color processing. Since the sub-screen control unit 61 meets the existing TV signal, satellite broadcasting is performed under the control of a microcomputer using two multi blacks 71 and 71 'as shown in FIG. Select any one of the signal and the existing TV signal to output.

In operation, since the conventional satellite broadcasting system has a band of 27 megabytes, when up to four signals of 6 megabytes are input, the four channels are mixed in the tuner although not shown, and the signals are demodulated and error corrected. After that, two or more channels are tuned through the first decoder to be output through different output ports.

In this case, a method of tuning two or more channels by the first decoder unit first initializes the digital signal processor and various decoders and then decodes the transmission packet as shown in FIG.

Subsequently, the program ID according to the decoding result is sequentially compared and checked with the selected channel of the connected TV, and if the selected channel or the additional selected channel is transmitted, data is transmitted to the corresponding second decoder unit for decoding the video and audio. If it is not selection channel and additional selection channel, other transmission packet is read.

In other words, when a viewer sends two channels to a TV through a remote control, the microcomputer in the TV can make two channels as program IDs, digitally process them, and then broadcast two or more channels simultaneously according to the flowchart of FIG. 8. .

As described above, according to the present invention, duplication of circuits can be prevented, and individual channel selection is possible by connecting the channel data selected for each TV through the channel selection unit.

Claims (5)

A first decoder unit for tuning a corresponding channel according to a control signal of each TV according to a user's selection, an output selection unit for selectively transmitting channel data tuned by the first decoder unit to the corresponding TV, A multi-channel digital satellite broadcasting receiver comprising a second decoder unit for receiving the channel-specific channel data transmitted by the TV to convert the video and audio signals for use in the TV. The multi-channel digital satellite broadcast receiver as claimed in claim 1, wherein the output selector is a demultiplexer. A first decoder unit for tuning two or more channels and outputting them through different output ports and a TV-to-one corresponding one-to-one correspondence for each TV to receive video data and audio signals for use in the TV. And a second decoder unit comprising a plurality of decoders for converting, and a sub-screen control unit for selecting and outputting a conventional TV signal and a satellite broadcast signal. 4. The multi-channel digital satellite broadcast receiver as claimed in claim 3, wherein the sub-screen control unit comprises a plurality of multiplexers for inputting a TV sub-signal and a satellite broadcast receiving signal by channel selection. Initializing the digital signal processor and various decoders; decoding the transmission packet and transmitting data to a corresponding decoder for decoding video and audio when the program ID is a selection channel or an additional selection channel; Control method of a multi-channel digital satellite broadcasting receiver comprising a process of reading a different transmission packet if not the selected channel