Electrical audio signal processing systems and devices – Dereverberators
Reexamination Certificate
2006-11-07
2006-11-07
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Dereverberators
C379S406010
Reexamination Certificate
active
07133529
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.
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patent: 6130949 (2000-10-01), Aoki et al.
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Chin Vivian
Lun-See Lao
Matsushita Electric - Industrial Co., Ltd.
Pearne & Gordon LLP
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