KR100531339B1 - An apparatus for integrated descrambler of the satellite broadcast receiver - Google Patents

Abstract

The present invention relates to an integrated decoding device of a satellite broadcasting receiver. The present invention provides an integrated decoding apparatus of a satellite broadcasting receiver including a first decoder and a second decoder having different decoding algorithms, comprising: a first half of a transport demux; A channel selector configured to select the first decoder or the second decoder according to a signal output from the first half of the transport demux and a channel selection signal of a user; An integrated decoder having the first decoder and the second decoder selected according to the channel selected by the channel selector; A RAM for storing values of system keys required by the first decoder and the second decoder; A key selection unit for selecting which of the first decoder and the second decoder the value of the system key stored in the RAM is to be input; A data selection output unit which selects and outputs any one of data decoded and output by the first decoder or the second decoder; And a transport demux second half for demuxing data output from the data selection output unit. According to the present invention, the configuration is simplified by integrating the transport demux with the first decoder and the second decoder.

Description

An apparatus for integrated descrambler of the satellite broadcast receiver

The present invention relates to an integrated decoding apparatus, and more particularly, to an integrated decoding apparatus of a satellite broadcasting receiver in which a transport demux is integrated into a decoder using another decoding algorithm, for example, a European decoder and a Japanese decoder.

In general, digital satellite broadcasting requires multiplexing of TV signals, and when multiplexing such TV signals (video / audio signals), video. Each audio is divided into a string of appropriate length called 'packets', and additional video and audio packets are appropriately transferred by attaching additional information such as a header and transmitted to a repeater (communication satellite) in a time division transmission method. .

The packet transmitted through the repeater can be restored to the original signal through the DBS receiver of the subscribers to view the channels transmitted from the broadcasting station.

In other words, a TV station converts a TV signal into a digital TV signal, compresses it, and transmits the signal to a satellite, and a communication satellite receives and amplifies the TV signal in space and retransmits it through a repeater, and the TV signal relayed from the communication satellite By receiving and demodulating by a receiver or a decoder, a program for a corresponding channel transmitted from a broadcasting station can be viewed.

At this time, the broadcasting station converts and compresses the video, audio, and transmission data signals into scrambled digital signals according to the MPEG (MPEG-2) standard, and configures them into packet streams to form a single TV signal stream.

Multiple scrambled digital TV signal streams are multiplexed in a transport multiplexer into transport stream packets and sent to the channel encoder.

The transport stream packet has a unit of 188 bytes and an effective data rate Ru is about 40 to 45 Mbps.

Meanwhile, in order to implement a limited reception function in which only a limited receiver can listen to a broadcast when transmitting a digital satellite broadcast, the satellite broadcast receiver must have a decoder for restoring the encrypted data transmitted from the broadcast station.

In general, European decoders and Japanese decoders are market driven as decoders for satellite broadcasting receivers. The European decoder uses a common discrambler type decoder, and the Japanese decoder uses a multi 2 (multi 2) decoder. Use the algorithm's decoder.

 In addition, in order to classify MPEG data streams into video, audio, and auxiliary data, and to deliver them to a suitable decoder, a transport demux for analyzing and parsing the data streams is required.

Hereinafter, with reference to the accompanying drawings as follows.

1 is a block diagram illustrating a satellite broadcast receiver according to the prior art. Hereinafter, a satellite broadcast receiver incorporating a Japanese decoder and a European decoder will be described as an example.

Referring to FIG. 1, an antenna 1, a low noise block (LNB) 2, a microcomputer 3, a tuner 4, an analog / digital (A / D) converter 5, QPSK demodulation section 6, preprocessing error correction (FEC) section 7, transport demux section 8, decoder 9, video decoder section 10, audio decoder section (11), NTSC encoder section 12, and D / A converter section 13, respectively.

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

First, the satellite broadcasting signal of the 11 to 12 kHz frequency band received by the antenna 1 is converted into the local oscillation frequency of the LNB 2 to be converted into a 950 to 2150 MHz frequency band signal, and then input to the receiver.

Here, the microcomputer 3 of the receiver transmits a repeater preset value having a different value for each repeater to a phase locked loop (PLL) (not shown) inside the tuner 4, and the repeater corresponding to the channel to be tuned by the user. 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 4, and then converted into a digital signal through the A / D converter 5, and the timing recovery and the carrier recovery are performed by the QPSK demodulator 6. do.

After that, the FEC 7 performs error correction, and the transport demux 8 selects and outputs only the corresponding signal by a control signal corresponding to a channel selected by the user among the corrected signals.

The decoder 9 descrambles the signal selected and output from the transport demux unit 8 and outputs the descrambled signal to the transport demux 8 again.

In addition, the video signal among the signals output from the transport demux 8 is input to the video decoder unit 10, decoded, and encoded by the NTSC encoder unit 12 and output as a video signal.

The audio signal of the signal output from the transport demux 8 is input to the audio decoder 11 and decoded, and is converted into an analog signal by the D / A converter 13 and output as an audio signal.

The decoder according to the prior art has the following problems.

First, the header parsing part is duplicated by using a decoder and a transport demux separately.

Second, since the encryption and decryption methods are different according to regions, it is not possible to generalize them because a decoder corresponding to each region is required.

The present invention has been made to solve such a problem, and the decoding algorithm integrates another decoder such as a European decoder and a Japanese decoder with a transport demux to share a function of sharing a transport demux and a decoding period. It is an object of the present invention to provide an integrated decoder of a satellite broadcasting receiver capable of providing compatibility by configuring a data interface between the first and second parts of a transport demux and a decoder.

The present invention provides an integrated decoding apparatus of a satellite broadcasting receiver including a first decoder and a second decoder having different decoding algorithms, comprising: a first half of a transport demux; A channel selector configured to select the first decoder or the second decoder according to a signal output from the first half of the transport demux and a channel selection signal of a user; An integrated decoder having the first decoder and the second decoder selected according to the channel selected by the channel selector; A RAM for storing values of system keys required by the first decoder and the second decoder; A key selection unit for selecting which of the first decoder and the second decoder the value of the system key stored in the RAM is to be input; A data selection output unit which selects and outputs any one of data decoded and output by the first decoder or the second decoder; And a transport demux second half for demuxing data output from the data selection output unit.

Hereinafter, with reference to the accompanying drawings, described as an example of the integrated decoder of the satellite broadcast receiver including a Japanese decoder and a European decoder as described in the prior art as follows.

2 is a block diagram showing an example of a satellite broadcasting receiver according to the present invention, Figure 3 is a block diagram showing an integrated decoder according to the present invention.

As shown in FIG. 2, an antenna 21, a low noise block (LNB) 22, a microcomputer 23, a tuner 24, and an analog / digital (A / D) conversion unit 25. QPSK demodulator 26, preprocessing error correction (FEC) unit 27, video decoder 29, audio decoder 30, NTSC encoder 31, D / A converter 32 Is made in the same manner as the prior art, and comprises an integrated decoder 28 incorporating a transport demux and a decoder.

As shown in FIG. 3, the integrated decoder 28 according to the signal output from the first half of the transport demux 41 for header parsing and the channel selection signal of the microcomputer 23, the European decoder 43a. Or an integrated decoder composed of a channel selector 42 for selecting the Japanese decoder 43b, and a European decoder 43a and a Japanese decoder 43b selected according to the channel selected by the channel selector 42 ( 43), the microcomputer 23 for setting the values of the initialization vector 44 required for the initial operation of the integrated decoder 43, the system key 45 for operating the integrated decoder 43, and the microcomputer ( A RAM 46 for storing the key set in step 23), a key selector 47 for selecting which decoder the key stored in the RAM 46 is to be input, and a key selector 47 selected from the key selector 47. A switching unit 4 for inputting a key to the European decoder 43a or the Japanese decoder 43b 8) and a data selection output unit 49 for selecting and outputting data decoded by the European decoder 43a or the Japanese decoder 43b, and receiving the data output from the data selection output unit 49. After the demux, it is composed of the second half of the transport demux 50 that outputs video, audio, and auxiliary data.

Meanwhile, the integrated decoder 43 integrates only the core portions of the European decoder 43a and the Japanese decoder 43b, and the initialization vector 44 and the system key 45 required by each decoder are integrated decoder ( 43 are connected to the European decoder 43a and the Japanese decoder 43b, respectively.

Therefore, the integrated decoder 43 receives the payload data portion from the transmitter demux first half 41 to perform decoding, and at the same time selects the European decoder 43a and the Japanese decoder 43b, and the European decoder. The common key value and the data key value used in the 43d and the Japanese-style decoder 43b are stored in the RAM 46 in common.

The signal transmitted from the transport demux first half 41 to the integrated decoder 43 is a stream start signal indicating that the payload portion of the stream is delivered to the decoder. There is a first stream end signal indicating the end of the payload, a scramble control signal indicating whether scramble is present, a ready signal indicating that the decoder is ready to decode, and a next address signal for requesting the next data byte.

The signal flow between the first transport demux 41, the integrated decoder 43, and the second transport demux 50 is shown in FIG.

Referring to FIG. 4, the signal transmitted from the integrated decoder 43 to the transport demux half 50 indicates a write enable signal for simultaneously outputting a decoded signal and a decoding of payload data. The second stream end signal and a buffer full signal indicating the preparation of a buffer for storing data received from the integrated decoder 43 are input to the integrated decoder 43 from the second half of the transport demux 50.

 Therefore, the decoder and transport demux share a header parsing portion necessary when the decoder and the transport demux are used separately, respectively, and the first portion of the transport demux 41 serves as a header parser and an analyzer, The port demux second half 50 has an interface for accumulating and classifying the Hayrod packet data decoded by the integrated decoder 43 and outputting video and audio data to an external decoder.

The transport demux may have a one-byte serial data interface between the first half 41 and the second half 50 and the integrated decoder 32.

Integrated decoder according to the present invention has the following effects.

First, the configuration is simplified by integrating the transport demux with the first decoder and the second decoder.

Second, manufacturing costs can be lowered as parts shrink.

Third, by implementing on one chip, data movement between components is stabilized and noise effects are reduced.

1 is a block diagram showing a satellite broadcasting receiver according to the prior art

2 is a block diagram illustrating a satellite broadcasting receiver according to the present invention.

3 is a detailed block diagram illustrating the integrated decoder of FIG. 2.

4 is a diagram illustrating a signal flow of an integrated decoder according to the present invention.

Explanation of symbols for main parts of the drawings

21: antenna 22: microcomputer

23: LNB 24: Tuner

25: A / D converter 26: QPSK demodulator

27: Correction of preprocessing error 28: Integrated decoder

29: video decoder 30: audio decoder

31: NTSC encoder 31: D / A converter

41: first half of transport demux 42: channel selector

43a: European decoder 43b: Japanese decoder

43: integrated decoder 44: initialization vector

45: key 46: ram

47: key selector 48: switching unit

49: data selection output section 50: the second half of the transport demux

Claims (1)

In the integrated decoding device of a satellite broadcasting receiver comprising a first decoder and a second decoder having different decoding algorithms, First half transport demux; A channel selector configured to select the first decoder or the second decoder according to a signal output from the first half of the transport demux and a channel selection signal of a user; An integrated decoder having the first decoder and the second decoder selected according to the channel selected by the channel selector; A RAM for storing values of system keys required by the first decoder and the second decoder; A key selection unit for selecting which of the first decoder and the second decoder the value of the system key stored in the RAM is to be input; A data selection output unit which selects and outputs any one of data decoded and output by the first decoder or the second decoder; And And a transport demux second half for demuxing the data output from the data selection output unit.

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