Sound determination method and sound determination apparatus

A technology for judging devices and judging methods, applied in measuring devices, speech analysis, utilizing re-radiation, etc.

Inactive Publication Date: 2008-08-06
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the current development of computer technology, even for acoustic signal processing that requires a large amount of operation processing, it becomes possible to perform processing at a practical processing speed

Method used

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  • Sound determination method and sound determination apparatus
  • Sound determination method and sound determination apparatus

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Embodiment Construction

[0043] Preferred embodiments of the present invention will be described below based on the accompanying drawings. In the embodiments described below, the acoustic signal as the processing target is mainly human speech sound (speech).

[0044] first embodiment

[0045] FIG. 1 is a diagram showing an example of a sound judging method of a first embodiment of the present invention. In FIG. 1 , reference numeral 1 is a sound judging device applied to a mobile phone. The sound judging device 1 is carried by a user and receives a voice uttered by the user as an acoustic signal. In addition, the sound determination device 1 receives various environmental noises, such as other people's voices, machine noise, music sound, etc., in addition to the user's voice. Therefore, the sound determination apparatus 1 suppresses noise by performing processing of recognizing a target sound signal from among various sound signals received from a plurality of sound sources, then emphasizing the rec...

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Abstract

The invention provides sound determination methods and apparatus. A sound determination apparatus receives acoustic signals by a plurality of sound receiving units, and generates frames having a predetermined time length. The sound determination apparatus performs FFT on the acoustic signals in frame units, and converts the acoustic signals to a phase spectrum and amplitude spectrum, which are signals on a frequency axis, then calculates the difference at each frequency between the respective acoustic signals as a phase difference, and selects frequencies to be the target of processing. The sound determination apparatus calculates the percentage of frequencies at which the absolute values of the phase differences of the selected frequencies are equal to or greater than a first threshold value, and determines that the acoustic signal coming from the nearest sound source is included in the frame when the calculated percentage is equal to or less than a second threshold value.

Description

technical field [0001] The present invention relates to a sound judging method and a sound judging device, which judge whether there is a specific sound signal based on sound signals received by a plurality of sound receivers from a plurality of sound sources, and particularly relate to a method for identifying a sound signal from a sound source closest to the sound receiver. A sound judging method and a sound judging device of an acoustic signal of a sound source. Background technique [0002] With the current development of computer technology, even for acoustic signal processing requiring a large amount of operation processing, it becomes possible to perform processing at a practical processing speed. It is thus expected that a multi-channel acoustic signal processing function using a plurality of microphones becomes available. An example of the above application is noise suppression technology. In noise suppression techniques, the sound from a target sound source, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S11/14G10L21/02G10L21/028G10L21/0308G10L25/18G10L25/78G10L25/84G10L25/90
CPCG10L25/48G10L2021/02166G10L25/27G10L25/78G10L21/0208
Inventor 早川昭二
Owner FUJITSU LTD
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