发明名称 |
Voice controlled attenuation adjustment in telephone transmission circuits |
摘要 |
A process and apparatus for a voice controlled attenuation adjustment in telephone transmission circuits is disclosed. Signals in the sending and receiving directions are decomposed into sub-band signals in a set of frequency sub-bands. Each frequency sub-band is associated with an attenuation device for each direction of transmission. Depending on the level of activity in each direction in a particular sub-band, the attenuation values of the attenuation devices of that particular sub-band are adjusted. The sub-band signals are then recombined.
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申请公布号 |
US4991167(A) |
申请公布日期 |
1991.02.05 |
申请号 |
US19890307324 |
申请日期 |
1989.02.06 |
申请人 |
TELENORMA TELEFONBAU UND NORMALZEIT GMBH |
发明人 |
PETRI, UDO;HAENSLER, EBERHARD;HAETTY, BIRGER |
分类号 |
H04M9/08;H04M9/10 |
主分类号 |
H04M9/08 |
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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