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MPEG audio frequency decoding method

A technology of audio decoding and frame length, which is applied in the invention field of decoding methods, can solve the problems of inability to calculate frame length, decoding, and inaccurate MPEG audio data, and achieve the effect of improving credibility

Inactive Publication Date: 2007-02-07
LG ELECTRONIC (HUIZHOU) CO LTD
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AI Technical Summary

Problems solved by technology

[0004] However, MPEG audio decoding using only such padding bits has the problem that MPEG audio data cannot be decoded accurately because the frame length cannot be calculated when an error occurs in the padding bits.

Method used

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Embodiment Construction

[0016] Next, the embodiment of the MPEG audio decoding method of the present invention will be described in detail with reference to the accompanying drawings.

[0017] First of all, it is worth mentioning that the present invention does not use stuffing bit information, and directly obtains the frame length in the case of 44.1KHz, and then performs synchronization word detection.

[0018] Generally, the frame length refers to the length from the sync word to the next sync word. In the present invention, the frame length is redefined.

[0019] figure 1 It is a block diagram of the MPEG audio decoding method of the present invention, and it is the decoding performed by calculating the new frame length.

[0020] First, the first sync word is detected on the input stream (S11).

[0021] figure 2 Shows the headers of the input stream. In the present invention, the remaining fields in the header except the synchronization field are defined as any header 1 .

[0022] If the a...

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Abstract

The invention relates to a MPEG video decode method, especially decoding the input stream at 44.1 kHz sample frequency, wherein said method comprises: checking the first synchronous word of input stream, and decoding the report head except from the synchronous word; via said decoding, calculating out the accumulated frame length (AFL); if the frame length has been calculated, checking next synchronous word, and checking the report head information, judging if there is mistake; if there is not mistake, calculating the frame length, to decode the frame.

Description

technical field [0001] The present invention is an invention related to MPEG audio, and more specifically, an invention related to an MPEG audio decoding method for decoding an input stream having a sampling frequency of 44.1 kHz. Background technique [0002] Currently, broadcast streams such as MPEG Layer-2 and bit streams such as MPEG Layer-3 (MP3) can be easily realized through public media such as the Internet. Moreover, MP3 is used as a personal portable playback medium all over the world. Because it can bring great economic benefits, most manufacturing companies now produce it. [0003] And, in MPEG audio, MP3 is digitally encoded from a CD with a 44.1kHz sampling frequency, and most streams have a 44.1kHz sampling frequency. In the MPEG audio specification, when the sampling frequency is 44.1 kHz, the MPEG audio decoding is performed using padding bits to coordinate the mean bit rate. [0004] However, MPEG audio decoding using only such padding bits has a problem ...

Claims

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Application Information

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IPC IPC(8): H04N7/24H04N5/92G11B20/10G10L19/00G10L19/008G10L19/03
Inventor 黄泰勋
Owner LG ELECTRONIC (HUIZHOU) CO LTD
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