KR19980078967A - Playback digital satellite broadcasting receiver and its control method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital satellite broadcasting receiver having a play back function. The present invention relates to a digital satellite broadcasting receiver for performing error correction and elimination of unnecessary data in a channel unit receiving a satellite signal and restoring compressed data while analyzing a stream. It is a digital satellite broadcasting receiver that adds memory to the unit to implement a playback function.

Although the conventional digital satellite broadcasting receiver can receive digital satellite broadcasting, there is no function of storing the broadcasting contents in the memory and watching again when the viewer wants to watch the screen again.

In the present invention, the playback memory is added to the demultiplexer so that control is performed according to the present invention, so that the user can watch the video while watching the satellite broadcast while performing the broadcasting process.

Description

Playback digital satellite broadcasting receiver and its control method

The present invention relates to a digital satellite broadcasting receiver having a playback function and a method for controlling the playback digital satellite broadcasting receiver. The present invention relates to a playback digital satellite broadcast receiver configured to implement a play back function by adding a memory to a source unit for restoring data.

The conventional digital satellite broadcasting receiver includes a channel unit 1 which receives a satellite signal and greatly amplifies it, and demodulates, corrects errors, and removes unnecessary data, as shown in FIG.

The source unit 2 is configured to receive and analyze the stream transmitted through the channel unit 2 and to restore the compressed data to output a video signal and an audio signal.

And the channel portion 1 as shown in detail in Figure 2,

Low Noise Block Down Converter (3) down-outputs the incoming signal at 11-12 GHz to 1 GHz and outputs it.

The tuning unit 4 tunes and outputs a signal corresponding to a selected channel among the down signals,

The QPSK demodulator 5 demodulates and outputs the tuned signal by QPSK (Quadarature Phase Shift Keying).

The channel decoder 6 performs FEC (Forward Error Correction) that recovers data transmitted by the transmitter while performing viterbi decoding, RS decoding, and descrambling to minimize errors while eliminating unnecessary data. It transfers to the source part 2 via the process.

In this case, the information passed through the channel decoder 6 includes one transport packet consisting of 188 bytes as a header of 4 bytes and a payload of 184 bytes. (SYNC) Decodes in the order of byte, 3 bits of control bit, 13 bits of program ID (PID), and 8 bits of control bit.

On the other hand, as shown in detail in FIG. 3, the source unit 2 is demultiplexer 7 connected to the channel unit 1 according to the program ID while analyzing the packets of the transport transmitted and input. The memory 10 is classified into a video stream, an audio stream, and additional information, and is output while being temporarily stored in the memory 8. The video decoder 9 receives a video stream classified by the demultiplexer 7 and compresses the memory 10. Video data is restored during temporary storage, and the encoder 11 encodes the video data restored by the video decoder 9 to perform color signal RGB, luminance / color (Y / C), and composite video. A signal of the signal CVBS is output.

The audio decoder 12 receives the audio stream classified by the demultiplexer 7 to restore the voice data, and the digital / analog converter (D / C) 13 converts the restored audio data into an analog signal. The microprocessor 14 controls internal operations including the demultiplexer 7, the video decoder 9, and the audio decoder 12.

4 shows the configuration of the demultiplexer 9 in detail. The TS unit 15 analyzes the program ID of the transport packet, collects the same program ID, and the PES unit 16 takes picture elements. Make it a stream.

Herein, the structure of the PES packet processed by the PES unit 16 follows the specification of MPEG2.

The conventional digital satellite broadcasting receiver can receive digital satellite broadcasting, but when the broadcast contents are stored in the memory and the viewer wants to watch the screen again, that is, the satellite broadcasting receiver having a playback function is implemented. There was no.

The present invention implements a play back function by adding a memory to a source part for performing error correction and eliminating unnecessary data in a channel part receiving satellite signals and restoring compressed data while analyzing a stream. It is an object of the present invention to provide a method for controlling a back digital satellite broadcast receiver and a playback digital satellite broadcast receiver.

The present invention for achieving the above object is to add a playback memory to the demultiplexer and to perform the control according to the present invention so that it is possible to watch while watching the video to watch again in the process of watching satellite broadcasts.

1 is a block diagram schematically showing the overall configuration of a conventional digital satellite broadcasting receiver.

2 is a detailed block diagram of a channel unit in a conventional digital satellite broadcasting receiver.

3 is a detailed block diagram of a source unit in a conventional digital satellite broadcasting receiver.

4 is a detailed block diagram of a demultiplexer in a conventional digital satellite broadcasting receiver.

5 is a block diagram of a playback digital satellite broadcasting receiver according to the present invention.

6 is a flow chart illustrating an operation process of the present invention.

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

7 is a view illustrating an embodiment of the present invention, and the channel unit is the same as a conventional configuration, and thus description thereof is omitted.

A demultiplexer 21 which analyzes transport packets transmitted from the channel part and classifies video information, audio information and additional information;

TS unit 22 for analyzing the program ID (ID) of the transport packet in the demultiplexer 21 to collect the same program ID, and

A PES unit 23 for making picture image data into an elementary stream in the demultiplexer 21;

A video decoder 24 transmitted from the demultiplexer 21 and restoring the compressed image data to the original image;

An NTSC encoder 25 for encoding the image data reconstructed by the video decoder 24 and outputting signals of RGB, Y / C, and CVBS;

An audio decoder 26 which is transmitted from the demultiplexer 21 and restores the compressed voice data to the original voice;

A D / A 27 for converting the speech data restored by the audio decoder 26 into an analog signal of speech and outputting a stereo speech signal L (R);

It is composed of playback memories 29 for implementing the function of playback in the demultiplexer 21 under the control of the system microcomputer 28 which controls the overall operation while receiving the user's option by the key. .

Where reference numerals 30 and 31 are memories.

An operation process of the present invention configured as described above will be described in detail with reference to a flowchart of FIG. 6.

First, when the user is not in the play mode, the TS unit 22 of the demultiplex 21 analyzes the header of the transport and lists up the PIDs to be displayed at present, and passes the stream to the required PIDs. If the PID is a PID of video, audio, or the like, the transport packet is decoded by the PES unit 23 to be output to the video decoder 24 and the audio decoder 26.

At this time, the TS unit 23 should always move together until the user playback mode is reached when the memory unit READ / WRITE POINTER WRITEs the memory 30 of the demultiplexer.

In the playback mode by the user in the above step, the TS unit 22 of the demultiplex 21 analyzes the header of the transpod and lists up the PIDs to be displayed at present and passes the stream to the necessary PIDs. If the desired PID is a PID of video, audio, etc., the transport packet is decoded by the PES unit 23 and outputted to the video decoder 24 and the audio decoder 26, and simultaneously to the playback memory 29. Save the data.

When data is filled in the limited playback memory 21, the data returns to the first address and continues to store (DATA WRITE).

When a user requests playback through a key and a playback signal is input, the microprocessor 28 recognizes the playback signal, and controls the video decoder 24 and the audio decoder 26 to temporarily STILL.

While the microprocessor 28 controls the demultiplexer 21 to pause, the TS unit 12 reads data from the memory 30 of the demultiplexer 21 for about 1 second to the memory 29. After further storing, a playback mode of reading and outputting data stored in the memory 29 is performed without directly transmitting data, and the data is transmitted to the PES unit 19 accordingly.

At this time, the microprocessor 28 does not send other PID information to the demultiplexer 21 and store it in the memory 30 of the demultiplexer 21.

In the state where all data stored in the playback memory 29 have been read, the original PID is output from the microprocessor 28 to the demultiplexer 21 to perform the same signal processing as when there is no playback signal.

As described above, according to the digital satellite broadcasting receiver having a playback function of the present invention, by adding a playback memory to the demultiplexer and performing the control according to the above, it is possible to watch while replaying an image to be viewed again in the process of watching satellite broadcasting. I did it.

Claims (3)

Receives satellite broadcast signals, performs signal processing such as amplification and error correction, and analyzes audio and video data stream information of tuned channels to restore audio and video data into audible signals and composite video signals to speakers and display means. In the digital satellite broadcasting receiver to output, A playback digital satellite broadcasting further comprising a playback memory for temporarily storing reception data corresponding to a predetermined number of frames or fields in a demultiplexer of the satellite broadcasting receiver and outputting the image information passed by the user's request. receiving set. The playback digital satellite receiver as claimed in claim 1, wherein the playback memory receives and stores data from the TS unit and transmits the data to the PRS unit. Receiving a digital satellite broadcasting signal and processing the data to determine whether it is in a playback mode and storing the received broadcast data in a playback memory, and reading data stored in the playback memory when a playback key is selected by a user. And controlling the output of the playback data to continue to the last minute of the pre-stored playback data and then returning to the playback mode determination step.