Wireless audio compression and decompression method based on time domain aliasing elimination and equipment thereof

An audio compression and time-domain aliasing technology, which is applied in the field of audio encoders and decoders, can solve the problems of high compression ratio, uncontrollable code stream, low delay, etc., and achieve the effect of improving compression ratio and reducing the amount of calculation

Inactive Publication Date: 2014-01-01
HANGZHOU NANO IC TECH CO LTD
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Problems solved by technology

[0007] In order to overcome the deficiencies of existing audio transmission technology that cannot effectively meet the high sound quality, low delay, high compression ratio and uncontrollable code stream of wireless audio transmission at the same time, the present invention provides a wireless audio compression and decompression method suitable for wireless audio applications And the corresponding audio encoder and audio decoder, which can achieve high compression ratio, low delay and medium computational complexity while ensuring the high quality of audio data

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  • Wireless audio compression and decompression method based on time domain aliasing elimination and equipment thereof
  • Wireless audio compression and decompression method based on time domain aliasing elimination and equipment thereof
  • Wireless audio compression and decompression method based on time domain aliasing elimination and equipment thereof

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[0048] The present invention will be further described below in conjunction with accompanying drawing, with reference to accompanying drawing:

[0049] The technical solution adopted by the present invention to solve its technical problems is:

[0050] 1. A wireless audio compression and decompression method based on time-domain aliasing elimination, comprising the following steps:

[0051] Step 1. Wireless audio compression, specifically including:

[0052] 1.1 Add a window to the input audio PCM data through a Kaiser window filter;

[0053] 1.2 Discrete cosine transform is performed on the obtained audio data through windowing and filtering to obtain a transformed frequency domain signal;

[0054] 1.3 Calculate the energy intensity of the transformed frequency domain signal, obtain the number of quantized bits, and write the number of quantized bits into the code stream through classification analysis;

[0055] 1.4 Calculate the frequency domain signal spectrum energy tab...

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Abstract

A wireless audio compression and decompression method based on time domain aliasing elimination comprises the steps of audio compression and audio decompression, wherein the audio compression step comprises windowed filtering, MDCT, quantification factor calculation, acoustic masking curve calculation, bit distribution, quantification calculation and bit stream generation which are carried out on input audio PCM data; the audio decompression step comprises code stream analysis, quantification factor analysis, acoustic masking curve calculation, bit distribution, inverse quantization, IMDCT, kayser window filtering and time domain aliasing. Wireless audio compression and decompression equipment further comprises an audio coder and an audio decoder.

Description

technical field [0001] The invention relates to a wireless application-oriented audio compression and decompression method and a corresponding audio encoder and decoder. Background technique [0002] The wireless digital audio system based on embedded technology effectively combines embedded technology, audio codec technology, and wireless transmission technology. Compared with the PC-based digital audio system, the wireless digital audio device based on embedded technology has a small size. , easy to carry, high functional specialization, low cost, high stability, good real-time performance and so on. Although wireless audio transmission is more flexible and convenient than wired audio transmission, it is limited by bandwidth, delay, and power consumption. However, the cost of the current Bluetooth SBC wireless audio system is relatively high, and the sound quality is low. Therefore, it is very meaningful to design an audio codec for wireless transmission that can achieve...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/032G10L19/002
Inventor 杨洋姚嘉任金平高永泽
Owner HANGZHOU NANO IC TECH CO LTD
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