发明名称 |
AID TO HEARING SPEECH IN A NOISY ENVIRONMENT |
摘要 |
2132739 9320669 PCTABS00027 A signal processing circuit is incorporated into an audio reproducing device for suppressing noise while preserving distinctive features of speech. A noise detecting circuit includes a low pass filtering circuit (12) and a level detector (14). An output signal (C) from the detecting circuit controls a variable high pass filtering circuit (20) to attenuate a range of low frequencies of an input signal (A) proportional to the detected level of noise. The variable high pass filtering circuit exhibits a family of variable response curves (22, 24, and 26) that vary in slope below a common cut-off frequency (28) that is below a range of frequencies that convey a majority of second formant transitions between consonants and vowels.
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申请公布号 |
CA2132739(A1) |
申请公布日期 |
1993.10.14 |
申请号 |
CA19932132739 |
申请日期 |
1993.03.16 |
申请人 |
AUDITORY SYSTEM TECH |
发明人 |
WALTON JOSEPH P;MILLER KENNETH R;TAYLOR JAMES C;FULLER LYNN F;FRISINA ROBERT D |
分类号 |
H04R25/00;(IPC1-7):H04R25/00 |
主分类号 |
H04R25/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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