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Encoding rate detection method and encoding rate detection device

A detection method and detection device technology, applied in the direction of error encoding/decoding synchronization, encoding constraints, synchronization devices, etc., can solve problems such as digital noise and adverse effects of semiconductor integrated circuit operating characteristics, and achieve the effect of suppressing digital noise

Inactive Publication Date: 2004-07-28
PANASONIC CORP
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Problems solved by technology

[0003] But, the detection method and device of the coding rate in the past, when the clock signal returns to the frequency corresponding to the minimum value m of the coding rate from the frequency corresponding to the maximum value n of the coding rate when synchronously judging, it will be caused by the frequency digital noise due to large changes
Therefore, as a semiconductor integrated circuit, when the code rate detection device and the analog circuit are integrated on one circuit board, the digital noise will adversely affect the operating characteristics of the semiconductor integrated circuit

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  • Encoding rate detection method and encoding rate detection device
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  • Encoding rate detection method and encoding rate detection device

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Embodiment Construction

[0020] Embodiments of the present invention will be described below with reference to the drawings.

[0021] figure 1 A program block diagram representing an encoding detection method according to an embodiment of the present invention.

[0022] First of all, as the premise of the present invention, in digital communication such as digital broadcasting, when encoding a transmission signal, there are various encoding rates r, and no one is fixed. Encoding rate to achieve synchronization in digital communications.

[0023] Methods for detecting synchronization include methods of detecting synchronization codes and methods of using a path metric. The method of detecting the synchronization code is to insert the synchronization code (for example, in the case of MPEG, "01000111" of 8 bits) in multiple places of the encoded signal, and if the synchronization code can be detected a given number of times, it is achieved. Synchronize. In addition, the method of using a path metric ...

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Abstract

An encoding rate detection method for detecting a predetermined encoding rate in a received encoded signal decodes the encoded signal by a 1st synchronization signal having a frequency corresponding to a 1st encoding rate to thereby generate a 1st decoded signal (ST11), and determines whether or not a synchronization is taken for the 1st decoded signal (ST12). In case where the synchronization is not taken, there is generated only a 2nd synchronization signal having a frequency corresponding to a 2nd encoding rate whose difference from the 1st encoding rate is smaller in comparison with an allowable value of the encoding rate decided by upper and lower limit values (ST13, 17).

Description

technical field [0001] The present invention relates to a coding rate detection method and a coding rate detection device for detecting the coding rate of the received coding signal when a coded signal coded at a given coding rate is received. Background technique [0002] In the field of digital broadcasting such as digital CS broadcasting, the viterbi decoding method belonging to the convolutional decoding method is used. In the past, at the receiving end, when receiving an encoded signal encoded with an unknown code r (m<=r<=n, where m represents the minimum value and n represents the maximum value.), the synchronous judgment by the viterbi decoder , to detect the encoding rate r of the received encoded signal. At this time, it is determined whether or not synchronization is achieved by sequentially changing the frequency of the clock signal used for synchronization determination from the minimum value m to the maximum value n corresponding to the encoding rate of ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/00H03M13/01H03M13/33H03M13/41H04L1/00H04L7/027H04L7/04H04N19/103H04N19/134H04N19/192H04N19/44H04N19/68H04N19/70H04N19/85
CPCH03M13/33H03M13/01H04L7/041H04L1/0046
Inventor 掛水隆史镰田刚弘中居祐二
Owner PANASONIC CORP