Whistler detection and suppresser thereof, its method and computer program products

Abstract

Herein disclosed a howling detecting and suppressing apparatus for detecting and suppressing howling sound components comprising: a frequency dividing processing section for converting a plurality of sound time signal segments each corresponding to a time segment into a plurality of sound frequency signal segments each corresponding to a frequency segment; a howling suppressing section for respectively adjusting gains for said sound frequency signal segments converted by said frequency dividing processing section to generate howling-suppressed sound frequency signal segments; a howling detecting section for judging whether a howling sound component is present or not for each of said howling-suppressed sound frequency signal segments generated by said howling suppressing section to detect howling sound frequency signal segments each in which it is judged that said howling sound component is present and non-howling sound frequency signal segments each in which it is judged that said howling sound component is not present; and a frequency synthesizing processing section for synthesizing said howling-suppressed sound frequency signal segments suppressed by said howling suppressing section to generate howling-suppressed sound time signal segments, whereby said howling suppressing section is operative to respectively adjust gains for said sound frequency signal segments converted by said frequency dividing processing section by changing the gains of said howling sound frequency signal segments detected by said howling detecting section and passing through said non-howling sound frequency signal segments detected by said howling detecting section.

Description

technical field [0001] The present invention relates to a howling detection and suppression device, a howling detection and suppression method, and a howling detection and suppression computer program product that automatically detects and suppresses a howling component due to acoustic coupling between a speaker and a microphone, and an apparatus including them sound equipment. Background technique [0002] Various howling detection and suppression devices that automatically detect and suppress howling components due to acoustic coupling between a speaker and a microphone have been proposed so far. For example, Unexamined Japanese Patent Application No. H07-143034 discloses one of conventional howling detection and suppression devices of this type. [0003] Refer below Figure 19 A typical example of howling detection and suppression equipment is described. Figure 19 The conventional howling detection and suppression device shown includes an input ...

AI Technical Summary

Problems solved by technology

[0011] However, there is a disadvantage in the conventional howling detection and suppression equipment, that is, when the conventional howling detection and suppression equipment occasionally inputs a sound signal containing a frequency band with a very large power value, the conventional howling detection and suppression equipment may erroneously detect to howling band

This means that, since conventional howling detection and suppression equipment detects howling components based on the ratio of the maximum power value to the average power value, when the power value of the frequency band contained in the sound signal is very large, the conventional howling detection and suppression equipment may Whispering frequency band detected incorrectly

[0012] Moreover, there is another shortcoming in the traditional howling detection and suppression equipment, that is, because the traditional howling detection and suppression equipment must include the same number of notch filters 1903 as the number of frequency bands to be filtered, in order to improve Frequency resolution, traditional howling detection and suppression equipment must increase the number of notch filter 1903 and coefficients f1 to fn

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