KR200262657Y1 - A digital DBS receiver having the CDMA modem - Google Patents

Abstract

The present invention relates to a digital satellite broadcasting receiver, and more particularly, to a digital satellite broadcasting receiver capable of providing text information service using a CDA modem.

In the conventional digital satellite broadcasting, only a pilot service using a small number of channels has been implemented, and commercial services are planned according to the selection of operators. However, technical detailed regulations for the high value-added information transmission services are insufficient until now.

The digital satellite broadcasting receiver having a CD modem according to the present invention devised to solve the above technical problem is a tuner, a demodulator, a forward error correction decoder, a demultiplexer, an image decoder, an image board, an audio decoder, a die converter. (D / A converter), a CD-A modem for receiving a CD-A signal and outputting a text data packet to a conventional receiver configured to include an additional information decoder; and receiving a signal from the CD-A modem. And a microprocessor unit for outputting text data; and a multiplexer for receiving text data from the microprocessor unit and multiplexing the same with the image data.

The digital satellite broadcasting receiver having a CD modem according to the present invention can transmit various data such as text messages to viewers without using a separate satellite broadcasting channel, and can implement various types of additional services using the same. It is said to have an effect.

Description

A digital DBS receiver having the CDMA modem

The present invention relates to a digital satellite broadcasting receiver, and more particularly, to a digital satellite broadcasting receiver capable of providing text information service using a CDA modem.

Digital satellite broadcasting is a broadcasting method that directly transmits broadcast signals to each home or general viewer through a satellite, and can cover a large area with less output than conventional terrestrial broadcasting. (ghost) has the advantage of reducing the phenomenon.

1 is a block diagram showing the general configuration of such a digital satellite broadcasting system. As shown, the digital satellite broadcasting system can be divided into three types except for the transmission / reception antenna. The transmission unit 101 converts, compresses, modulates and transmits the image, audio, and data signals to the satellite body 102. ), A satellite body 102 for receiving and amplifying a signal copied from the transmitter 101, converting frequency, and retransmitting it back to the ground, and receiving and demodulating a signal retransmitted from the satellite body 102 to perform compression. It comprises a receiver 103 for solving and outputting each of the original signal to solve.

2 is a block diagram illustrating a schematic configuration of the receiver of FIG. 1. The high frequency signal (12 GHz) retransmitted from the satellite body (102) to the ground is received by a receiving antenna, down-converted to a 1 GHz signal by a low noise block-down converter (LNB) 202, and then amplified by a cable. Is sent to a tuner 203. The tuner 203 tuned to a specific frequency by the viewer's selection outputs only a signal corresponding to the tuned frequency. The signal output from the tuner 203 is demodulated by the demodulator 204, and corrected by a forward error correction (FEC) decoder 205 and then demultiplexer (206). Is sent to.

The demultiplexed signal is demultiplexed by the demultiplexer 206 into an image signal, an audio signal, and an additional information data signal. The image signal separated by the demultiplexer is input to the image decoder 207, decoded, and then input to the image board 208, which is converted into an image signal suitable for a display device and output. In addition, the voice signal input to the voice decoder 209 is decoded and then converted into an analog signal by the D / A converter 210 and output to the speaker. In addition, the additional information data signal input to the additional information decoder 211 is decoded and then transmitted to the microprocessor 212 and processed according to a predetermined procedure.

A conventional set-top box (STB) 201 is composed of the remaining components except for the LNB 202 in the configuration of the receiver 103. However, although the provision of the additional information service using the digital satellite broadcasting system has various applicability, there are no specific application methods that can increase the added value by using the same. In particular, although the text information providing service whose use value has already been proved through some terrestrial broadcasting and cable TV broadcasting has high added value, detailed implementation methods suitable for the characteristics of the service are still lacking.

Digital satellite broadcasting receiver having a CD modem in accordance with the present invention devised to solve the above problems, by further comprising a CD modem in the conventional receiver to enable the transmission of the character information by the character information It is a technical problem to provide a digital satellite broadcasting receiver capable of implementing a provided service.

1 is a block diagram showing a schematic configuration of a digital satellite broadcasting system.

2 is a block diagram illustrating a schematic configuration of the receiver of FIG. 1.

Figure 3 is a block diagram showing the configuration of a preferred embodiment of a digital satellite broadcasting receiver having a CD modem in accordance with the present invention.

※ Explanation of codes for main parts of drawing

101. Transmitter 102. Satellite

103. Receiver

201, 301. Digital Satellite Broadcasting Receiver (STB; Set Top Box)

202. Low Noise Block 203, 303. Tuner

204. Demodulator

205,306. Forward Error Correction (FEC) Decoder

206,307. Demultiplexer 207. Picture decoder

208,309. Video board 209. Voice decoder

210,311. D / A converter 211. Additional Information Decoder

212,313. Microprocessor unit

302. CDMA modem 304. A / D converter

305. QPSK Demodulator 308. MPEG-2 Picture Decoder

306. Concatenated Convolutional / Reed-Solomon Decoder

310. MPEG-2 Voice Decoder 312.MPEG-2 Side Information Decoder

314. Multiplexer

In order to solve the above technical problem, the digital satellite broadcasting receiver having a ROM according to the present invention includes: a tuner tuned to a channel to be received; and a demodulator to demodulate a signal input from the tuner; and the demodulated signal. A forward error correction decoder for detecting and correcting a transmission error of the decoder; and a demultiplexer for dividing the corrected signal into images, voices, and additional information data packets, respectively, and outputting the received image data packets from the demultiplexer. An image decoder for decompressing, converting the image data into a predetermined format, and outputting the image data; and an image board for appropriate signal processing for receiving image data from the image decoder and transmitting the image data to an external display device; and audio data packet from the demultiplexer. Takes input, decompresses it, converts it into a predetermined format, and outputs it. A voice decoder which converts the voice data inputted from the voice decoder into an analog signal and delivers it to a speaker, and receives and decompresses the additional information data packet from the demultiplexer. An additional information decoder for converting and outputting a predetermined format; and a CD modem for extracting and outputting a text data packet signal including text information from a neighbor base station; A microprocessor unit which receives the text data packet signal from a modem and performs a series of signal processing for reading the text data packet and outputting the text data, and image data received from the microprocessor unit and outputted from the image decoder; Multiplex together the image It is configured to include; multiplexer to the transfer draw.

Hereinafter, a preferred embodiment of a digital satellite broadcasting receiver having a CD modem according to the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same or corresponding members will be denoted by the same reference numerals and detailed description thereof will be omitted.

Figure 3 is a block diagram showing the configuration of a preferred embodiment of a digital satellite broadcasting receiver having a CD modem according to the present invention. The satellite body 102 having a plurality of broadcast satellite repeaters outputs a multiplexed transport stream in multiple channels, and the outputted transport stream is received by a receiving antenna and is downlinked to a signal of 1 GHz in the LNB 302. After conversion, it is amplified low noise.

A tuner 303 tuned to a specific frequency by the viewer's tuner receives a signal from the LN viro 302 and outputs only a signal corresponding to the tuned frequency, wherein the tuned analog signal is an AD converter. The A / D converter 304 converts the digital signal, and the quadrature phase shift keying (QPSK) demodulator 305 performs phase demodulation to remove carrier components from the converted digital signal. The reason for using the QPSK modulation and demodulation method is that power efficiency is given priority over spectrum because the power of satellite repeaters is limited.

The digital signal output from the demodulator 305 goes through a concatenated convolutional / reed-solomon decoder 306 to correct errors generated during transmission by noise or interference. The transport stream decoded by the concatenated convolutional / lead-solomon decoder 306 is inputted to the demultiplexer 307 to be separated into a desired image data packet, an audio data packet, and an additional information data packet to be transmitted.

The image data packet separated by the demultiplexer 307 is input to the MPEG-2 (Motion Picture Expert Group-2) image decoder 308 and decoded, and the decoded image data is input to the image board 309 again. It is converted to a format suitable for display and then sent to the display.

The voice data packet separated by the demultiplexer 307 is input to the MPEG-2 voice decoder 310 and decoded, and the decoded voice data is again input to a D / A converter 311 to receive an analog signal. It is converted to, and transmitted to the speaker to be expanded.

Since the additional information data packet separated by the demultiplexer 307 is compressed, it is input to the additional information decoder 312 which decompresses and decoded.

The CD modem receives a CD radio signal from an adjacent base station through an antenna, performs a series of received signal processing procedures for demodulating and converting it, and extracts a text data packet signal including the transmitted text information. Print it out.

The microprocessor unit 313, which receives the text data packet signal from the CD modem, reads it by referring to its header section and extracts the text data recorded in the payload section. Perform the process. The signal processing is performed by loading a program from a ROM (Read Only Memory) provided in the unit, and the data generated in the processing is stored in a random access memory (RAM). Further, according to the read result, the microprocessor unit performs a corresponding control operation. For example, if the transmitted text data is a text message to be displayed through an external display device, the microprocessor unit sends the text data to the multiplexer 314. To be transmitted and displayed.

The text data output from the microprocessor unit is transmitted to the multiplexer 314 as necessary as described above, which is multiplexed together with the image data output from the MPEG-2 picture decoder 308 to the image board 309. To send to The multiplexed text data and image data may be displayed together on the display through the image board 309, and only the text data may be displayed.

The image board 309 should have a function of receiving image data and text data from the multiplexer 314 and displaying them together on the display as described above. For example, the text message represented by the text message data may be overlapped and displayed at the bottom of the image.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes that can be made without departing from the technical spirit of the present invention are engaged in the technical field to which the present invention belongs. It will be apparent to those of ordinary skill.

As described above, the digital satellite broadcasting receiver having a CD modem according to the present invention can transmit various data such as text messages to viewers without using a separate satellite broadcasting channel and various forms of using the same. It contributes to the development of value-added services.

In addition, it is possible to provide differentiated services for each subscriber by using a terminal identification code individually assigned to each CD modem, which uses subscriber information such as age, gender, and region of residence. This means that you can provide very specialized services. For example, if a particular subscriber lives in Yangjae-dong, Seocho-gu, Seoul, only the subscriber can decrypt and view the ad texts of various shops and restaurants located in Yangjae-dong nearby with the terminal code of the subscriber. To ensure that

Claims (1)

A tuner tuned to a channel to be received; A demodulator for demodulating a signal input from the tuner; A forward error correction decoder for detecting and correcting a transmission error of the demodulated signal; A demultiplexer for dividing the corrected signal into images, voices, and data packets and outputting the divided signals; An image decoder which receives an image data packet from the demultiplexer, decompresses it, converts the image data packet into a predetermined format, and outputs the converted data; An image board for performing appropriate signal processing for receiving image data from the image decoder and transmitting the image data to a display device; A voice decoder which receives a voice data packet from the demultiplexer, decompresses it, converts the voice data packet into a predetermined format, and outputs the converted voice; A D / A converter for converting voice data input from the voice decoder into an analog signal and transferring the converted voice data to a speaker; An additional information decoder which receives the additional information data packet from the demultiplexer, decompresses it, converts it into a predetermined format, and outputs the converted information; A CD modem which receives a CD signal from an adjacent base station and extracts and outputs a text data packet signal including the transmitted text information; A microprocessor unit which receives the text data packet signal from the CD modem and performs a series of signal processing for reading the text data packet signal and outputting the text data; And And a multiplexer for receiving text data from the microprocessor unit, multiplexing the image data output from the image decoder, and transmitting the same to the image board.