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Device and method for distortionless audio compression/decompression entropy-compression coding

A technology of audio coding and compression devices, which is applied in speech analysis, code conversion, electrical components, etc., and can solve problems such as uncomfortable compression and large amount of calculation

Inactive Publication Date: 2007-07-04
IND TECH RES INST
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Problems solved by technology

[0009] However, the above-mentioned known techniques require a large amount of computation whether they use Huffman table coding or arithmetic coding (Arithmetic coding), and are not suitable for real-time compression.

Method used

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  • Device and method for distortionless audio compression/decompression entropy-compression coding
  • Device and method for distortionless audio compression/decompression entropy-compression coding
  • Device and method for distortionless audio compression/decompression entropy-compression coding

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Embodiment Construction

[0019] Please refer to FIG. 3 , which discloses an audio entropy compression encoding device suitable for various time domain predictions according to a preferred embodiment of the present invention, which includes a buffer, a time axis predictor and an entropy decoder for bit allocation. The buffer is used to divide the input original uncompressed audio into a plurality of audio frames (audioframe), and the audio frame is one-dimensional audio value data containing fixed audio points arranged in sequence; the time axis predictor is used to input The audio value at the time point in the audio picture is subtracted from the predicted value at that point to generate a prediction error signal (which is actually a numerical value, or also called a prediction error signal value) of the compressed audio. The initial value at the beginning of the subtraction operation is set to zero, which means that the first input to the time axis predictor is the original uncompressed audio and its...

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Abstract

The invention provides an undistorted audio compression / decompression entropy coding device and method. The device includes buffer, time axis predictor and bit distributing entropy coder and decoder, thereinto the time axis predictor will make the preset value of point input signal value subtract the original input signal value to generate preset error signal. Then, the preset error signal is input into the bit distributing entropy decoder to code to data section with different length. The data section structure after the entropy coding includes file header information with 32bits, the real data is after the file header, but the data is actually the difference between the original value and the minimum value.

Description

technical field [0001] The present invention relates to an audio compression / decompression device and its method, and in particular to a distortion-free audio compression / decompression device and its method through entropy compression coding. Background technique [0002] The development of broadband transmission environment such as broadband network and wireless communication will make the transmission of high-quality audio-visual information an inevitable trend. One of the biggest differences between the third-generation mobile communication and the current GSM mobile communication system is its ability to transmit audio-visual data. Due to the advancement of technology, high-quality and even distortion-free audio signal transmission has become one of the possible trends. Its main application level is that the distortion-free audio signal gives users a complete editing space, which can be transmitted according to different application occasions. Bit-rate audio signals, for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/04H03M7/30G10L19/032
Inventor 陈信豪吴国瑞朱朝居黄得瑞
Owner IND TECH RES INST
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