发明名称 |
Speech presence detector |
摘要 |
A speech detection system for detecting the presence of speech in an audio input signal 1 derived from a predetermined environment such as an HF communication system. Algorithms are used at 4 to extract salient features from a digital signal obtained by analogue to digital conversion at 3 from a received audio signal 1. The algorithm outputs are applied to a neural network 5 which is trained by back propagation to distinguish between speech and other signals. The output of neural network 5 controls a switch or relay 6 to pass an audio signal for the duration a speech is detected. Delay 6 is for ensuring that the initial part of speech is not lost. Filter 10 removes high frequency components introduced by DAC 9. A post processing stage may follow neural network 5 for effective control of switch 6. The algorithm processor 4 may receive a digital audio signal directly as well as via an FFT stage. <IMAGE>
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申请公布号 |
GB2278984(A) |
申请公布日期 |
1994.12.14 |
申请号 |
GB19930012049 |
申请日期 |
1993.06.11 |
申请人 |
* REDIFON TECHNOLOGY LIMITED |
发明人 |
ANDREW * BISHOP;KIEREN LEE * FEAKES;ALAN * PETTITT |
分类号 |
G10L11/02;G10L15/16;(IPC1-7):G10L3/00 |
主分类号 |
G10L11/02 |
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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