发明名称 |
Dynamic balance control for telephone |
摘要 |
A telephone includes a transmit channel and a receive channel, each including a bank of sub-band filters having a VAD coupled one to each sub-band filter. Each VAD measures the spectral energy in a sub-band, compares the spectral energy to a first threshold, and produces an output signal representative of whether or not the first threshold is exceeded. The voice activity detector also includes a threshold circuit for calculating a dynamically adjustable noise threshold based upon averaged measured spectral energy. A wide band or system VAD monitors echo canceling circuitry to detect voice activity and double talk. A dynamic balance control circuit maintains the transmit and receive channels in a predetermined energy ratio during double talk.
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申请公布号 |
US6990194(B2) |
申请公布日期 |
2006.01.24 |
申请号 |
US20030441724 |
申请日期 |
2003.05.19 |
申请人 |
ACOUSTIC TECHNOLOGY, INC. |
发明人 |
MIKESELL JAMES R.;STORY FRANKLYN H. |
分类号 |
H04M1/00;H04B1/38;H04M;H04M9/08 |
主分类号 |
H04M1/00 |
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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