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Device and method for synchronization data processing system with data flow

A data processing system and data stream technology, applied in the field of synchronization methods and systems, can solve problems affecting the quality of playing audio signals and the like

Inactive Publication Date: 2006-08-30
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the synchronization is not done well and the decoding is started at an inappropriate position, it will seriously affect the quality of the playback audio signal

Method used

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  • Device and method for synchronization data processing system with data flow
  • Device and method for synchronization data processing system with data flow
  • Device and method for synchronization data processing system with data flow

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Embodiment Construction

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, a preferred embodiment is exemplified below and described in detail in conjunction with the accompanying drawings.

[0021] FIG. 3 is a flowchart of a synchronization method 200 according to an embodiment of the present invention. In step 204, the pointer GOOD_count is reset to 0, where the pointer GOOD_count refers to the number of valid headers.

[0022] After step 204, step 206 is performed, where the first sync character is detected in a received encoded audio signal data stream. Since an audio signal data stream should include several frames, and each frame includes a frame header with a sync character, the first sync character can be positioned first. According to the MPEG audio signal protocol, the length of the frame header is a fixed value (32 bits), and the beginning of the frame header is a synchronization character with a length of 12 bits...

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Abstract

A synchronization method and system for decoding digital audio data stream. A data stream has synchronization words successively spaced with data payloads. A detector detects one of the synchronization words. A header sensor detects a frame header associated with a detected synchronization word. A location estimator estimates a search region in the data stream according to a detected header. If the search region is estimated, the word detector directly searches the search region to locate one of the synchronization words. A decision maker determines whether the system is synchronized with the data stream after the word detector locates one of the synchronization words.

Description

technical field [0001] The present invention relates to a synchronization method and system; in particular, to a synchronization method and system for decoding digital audio streams. Background technique [0002] A variety of digital video / audio signal processing standards have been widely used in the industry to encode video or audio signal data into digitally encoded signals for further transmission and storage. For example, MPEG (Motion Picture Experts Group) audio signal protocols (ISO / IEC 11172-3 and ISO / IEC 13818-3) compress and decompress audio signals with different sampling rates and bit rates. The MPEG audio signal protocol defines three different layers: Layer I (Layer I), Layer II (Layer II), and Layer III (Layer III). A digitally encoded signal conforming to the MPEG audio signal protocol includes a plurality of frames, and each frame includes a plurality of fields. FIG. 1 shows the audio signal frame format of each of the three layers defined by the MPEG audi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/54H04N7/52H04N5/44
CPCH04N5/602H04N21/4307H04N5/04H04N5/4401H04N21/439H04L7/10H04N7/52H04N21/426H04N21/43074
Inventor 林宗瑶
Owner MEDIATEK INC