Sound compression system and method for abnormal sound detection

A sound compression and abnormal sound technology, applied in voice analysis, instruments, etc., can solve the problems of not being able to meet fast transmission and fast transmission, and achieve the effect of improving performance and good compression effect

Inactive Publication Date: 2017-09-01
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the traditional compression methods based on discrete Fourier transform, discrete cosine transform and wavelet transform cannot meet the needs of fast transmission in the abnormal sound detection system, and still fail to meet the needs of fast transmission

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  • Sound compression system and method for abnormal sound detection
  • Sound compression system and method for abnormal sound detection
  • Sound compression system and method for abnormal sound detection

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0035] The sound compression system among the present invention has used a kind of improved method based on the sound signal compression of discrete cosine transform, promptly has adopted the mode of combining based on angle error limit segmental fitting and the compression based on discrete cosine transform, and other Sound compression systems have lower compression ratios.

[0036] figure 1 It is a schematic diagram of a sound compression system applied to abnormal sound detection according to an embodiment of the present invention, such as figure 1 As shown, the first embodiment of the present invention provides a sound compression system applied to abnormal sound detection, including: segment fitting compression modu...

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Abstract

The invention discloses a sound compression system for abnormal sound detection. Sound compression is an important module in an abnormal sound detection system. For the defect that sound compression in an existing sound compression system can't meet system real-time requirement, the invention provides a sound compression system adopting an angle-error-limit piecewise fitting and discrete cosine transform (DCT) compression method. In the system, reasonable angle errors are set first; whether to carry out compression is judged point by point according to geometric angle and limited angle errors from a first sampling point of a time-domain waveform, and piecewise simulation of signal waveform is realized; and then, a conventional compression method based on discrete cosine transform is adopted to select an appropriate threshold for compression again. After two compression, compared with a conventional sound compression method, the compression method used in the invention is superior in compression effect.

Description

technical field [0001] The present invention relates to a sound compression system, in particular to a sound compression system with a lower compression rate in an abnormal sound detection system. Background technique [0002] In practical applications such as wireless networks and satellite communications, bandwidth resources are very limited. It is generally necessary to compress the frequency band of voice signals before signal transmission, because voice signals will occupy more bandwidth after digitization. However, the traditional compression methods based on discrete Fourier transform, discrete cosine transform and wavelet transform cannot meet the needs of fast transmission in abnormal sound detection systems, and still fail to meet the needs of fast transmission. Therefore, there is an urgent need for a new sound compression system to improve the performance of sound compression in the abnormal sound detection system, thereby improving the performance of the abnorma...

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Application Information

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IPC IPC(8): G10L19/02G10L19/097G10L19/16G10L25/78
Inventor 陈曙东孔聪聪辛欣
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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