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Integer wavelet transform-based audio lossless compression encoding and decoding method

A technology of wavelet transform and lossless compression, which is applied in the field of information source encoding and decoding, and can solve problems such as incomplete de-correlation

Active Publication Date: 2011-01-12
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When linear predictive coding is used for decorrelation, the redundancy of the original audio signal is not completely removed, that is, the decorrelation is not complete.

Method used

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  • Integer wavelet transform-based audio lossless compression encoding and decoding method
  • Integer wavelet transform-based audio lossless compression encoding and decoding method
  • Integer wavelet transform-based audio lossless compression encoding and decoding method

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Embodiment Construction

[0067] Below with reference to accompanying drawing of the present invention, describe preferred embodiment of the present invention in more detail, describe in detail how to realize the technical scheme of this invention:

[0068] The audio lossless coder / decoder system according to the method of the present invention includes two parts: a coder subsystem and a decoder subsystem. The structure diagram of the system is as figure 1 and figure 2 shown, where figure 1 It is a structural block diagram of the audio lossless compression coding subsystem, figure 2 It is a block diagram of the frequency lossless compression decoder subsystem. The system structure will be introduced in detail below in conjunction with the accompanying drawings.

[0069] 1. Overall plan:

[0070] Encoder part: Encoder structural block diagram such as figure 1 As shown: the audio file is first divided into several frames according to the framing strategy, and the framing information is included i...

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Abstract

The invention discloses an audio lossless compression encoding and decoding method and belongs to the field of information source encoding and decoding. In the method, a signal is framed adaptively according to related conditions of the former frame and the later frame of the signal, wherein a frame signal after framing is a combination of signals with similar signal characteristics, so that an encoder can achieve higher compression efficiency and is good for later integer wavelet transform and linear predictive encoding. For lossless compression encoding, a signal can be completely reconstructed, and the complete reconstructed characteristic of the signal is guaranteed by adopting integer lifting wavelet transform. Compared with the prior art, after a related adaptive framing-based module and an integer lifting wavelet-based de-correlation module are introduced, redundant information in an original signal can be well de-correlated, and the generated compressed data contains less redundant information. Therefore, the audio lossless compression encoding and decoding method can greatly improve the compression ratio by low computation complexity.

Description

technical field [0001] The invention belongs to the field of information source encoding and decoding, and in particular relates to an audio lossless compression encoding and decoding method. Background technique [0002] With the advent of the digital age, the digitalization of audio signals has brought a lot of convenience to people while generating massive audio data, which has brought great challenges to the storage and transmission of audio signals, and has become an obstacle that hinders people from obtaining and using multimedia. One of the information bottlenecks. In order to solve this problem, it is necessary to compress the audio data, and store and transmit the data in a compression coded manner. Facts have proved that it is necessary and feasible to compress multimedia data, because there is strong redundant information in multimedia data information such as sound and image, that is, there is a strong correlation between data, which can be removed by removing r...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L19/04G10L19/03
Inventor 吴玺宏曲天书迟惠生高懿何文欣张搏
Owner PEKING UNIV
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