A kind of embedded audio acquisition terminal aac audio coding method
An audio acquisition and audio coding technology, applied in speech analysis, instruments, etc., can solve the problem of high algorithm complexity and achieve the effect of reducing bandwidth
Active Publication Date: 2017-02-15
SOUTHEAST UNIV
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However, the AAC standard algorithm has high complexity, and it is difficult to realize real-time software coding on embedded devices with limited computing power without optimization. For most embedded devices, it is difficult to independently complete real-time software coding of AAC audio
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[0017] The present invention will be further described below in conjunction with the accompanying drawings.
[0018] Such as figure 1 Shown is an AAC audio coding method for an embedded audio acquisition terminal, based on the idea of splitting AAC audio coding between frames and splitting it into two ends of coding:
[0019] According to the computing power it can provide and the allowable audio coding delay, the audio collection end splits the collected original audio signal into two parts according to a certain amount, one part is directly AAC encoded locally and then transmitted to the storage playback end, and the other A part is transmitted to the storage player after simple ADPCM encoding;
[0020] The storage player performs different processing on the received data: directly encode and store the received AAC code; first decode the received ADPCM code into original data, then perform AAC code on the original data and store the result code; The storage and playback ...
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The invention discloses an embedded type audio acquisition terminal AAC audio coding method. Inter-frame splitting is conducted on the basis of AAC audio coding; the splitting process is carried out according to the idea of conducting coding at two terminals; at an embedded type audio acquisition terminal, acquired original audio signals are split into two parts by a certain number according to the computing capacity and the admissible audio coding delay of the embedded type audio acquisition terminal, AAC coding is directly conducted on one part of the original audio signals locally before the original audio signals obtained after the AAC coding are transmitted to a storage and play terminal, and ADPCM coding is simply conducted on the other part of the original audio signals before the original audio signals obtained after the ADPCM coding are transmitted to the storage and play terminal; at the storage and play terminal, different received data are processed differently, and finally complete and ordered AAC audio data are output. According to the embedded type audio acquisition terminal AAC audio coding method, the splitting is conducted on AAC audio coding, as a result, the embedded type audio acquisition terminal with limited operational capability can carry out part of AAC audio coding, operation resources of the acquisition terminal are fully utilized, no special hardware resources are needed, and the bandwidth needed by data transmission is reduced.
Description
technical field [0001] The invention relates to an AAC audio coding method of an embedded audio collection terminal, which is suitable for embedded equipment. Background technique [0002] In the field of audio coding, compared with other audio coding methods, AAC audio coding has the advantages of higher compression ratio and better sound quality at low bit rates. However, the AAC standard algorithm has high complexity, and it is difficult to implement real-time software encoding on embedded devices with limited computing power without optimization. For most embedded devices, it is difficult to independently complete real-time software encoding of AAC audio. Contents of the invention [0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an AAC audio real-time encoding method that reduces the computing power required by the embedded device, while meeting the AAC audio coding requirements of the embedded ac...
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IPC IPC(8): G10L19/008
Inventor 黄少珉林潇航戚隆宁周杰王功左红明
Owner SOUTHEAST UNIV