Digital audio time-domain compression method based on music characteristics
A technology of music characteristics and digital audio, applied in digital recording/reproduction, signal processing using self-timing codes, etc., can solve problems such as excessive music speed, sound jitter, and affecting music playback quality, so as to improve playback quality and reduce audio frequency. Mass impact, effect of reducing amount of time reduction
Active Publication Date: 2012-05-09
TSINGHUA UNIV
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[0003] The existing digital audio time-domain compression method has the following disadvantages: the uniform digital audio time-domain compression method performs time-domain compression on each audio segment in the music according to the same time-domain compression rate, so for the segment with low compression resistance value in the music , it will cause the music speed to be too fast, sound jitter and other phenomena, which will affect the playback quality of the music after time domain compression
However, existing non-uniform digital audio time-domain compression methods, such as the invention patent titled "A Digital Audio Time-Domain Compression Method Based on Lyrics", whose application number is CN200910235724.3, and whose publication number is CN101702321A, can only be processed based on lyrics Composition, cannot handle compositions without lyrics
At the same time, this method only uses the lyric density information to estimate the compression resistance of each audio segment, and cannot obtain the compression resistance information inside a lyric sentence
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[0017] The principle block diagram of the digital audio time-domain compression method based on music features proposed by the present invention is as follows: figure 1 As shown, including the following steps:
[0018] (1) According to the time length T of the compressed music digital audio set by the user u And the original music digital audio time length T m , Get the time domain compression ratio And get the total time reduction after compression D=T m -T u , According to user settings, the total time reduction after compression D is divided into k time slices of equal length
[0019] In the embodiment of the present invention, the time length T of the compressed digital audio of the music u The value range of is 0u m . The value range of the time domain compression ratio p is 0u And the time length T of the digital audio of the music before compression m The unit is seconds. The number of time slices k is specified by the user, and k is a positive integer.
[0020] (2) Divide...
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The invention relates to a digital audio time-domain compression method based on music characteristics, belonging to the technical field of audio processing. The method comprises the following steps: extracting audio and lyric characteristics of music, analyzing and acquiring compression resistance values of all audio clips in the music, and carrying out different degrees of time-domain compression on the audio clips in the digital audio of the music according to the compression resistance values, thereby changing the play time of the music. In the method, the audio, lyric and other characteristics of music are extracted to compute the compression resistance values of all the audio clips in the digital audio of the music, so that the reduction degrees of play quality of the audio clips after time-domain compression can be accurately described. When carrying out time-domain compression on the digital audio, the time reduction amount of time-domain compression is firstly allocated to the audio clip with high compression resistance according to the magnitude of the compression resistance values, thereby reducing the time reduction amount of the audio clip with low compression resistance, effectively lowering the influence of time-domain compression on the quality of the whole music and enhancing the play quality of the music after time-domain compression.
Description
Technical field [0001] The invention relates to a digital audio time-domain compression method based on music characteristics, and belongs to the technical field of audio processing. Background technique [0002] In digital audio processing, it is often encountered that the time length of digital audio does not match the time length requirements of the application environment. For example: Use a piece of music with a period of 330 seconds as the soundtrack for a video clip with a period of 280 seconds. In order to make the time length of the digital audio meet the time length requirement of the application environment, it is necessary to use the digital audio time domain compression method to perform the time domain compression on the digital audio. After the time domain compression is performed, it is necessary to ensure that the playback quality of digital audio can meet the appreciation needs of users. [0003] The existing digital audio time-domain compression method has the ...
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IPC IPC(8): G11B20/14
Inventor 王朝坤王建民刘璋
Owner TSINGHUA UNIV