发明名称 |
Loop gain processing system for speakerphone applications |
摘要 |
A loop gain processing scheme for a speakerphone arrangement determines system loop gain according to two echo feedback paths within the speakerphone system. Gain values for each half-loop are calculated separately to ensure that both the local and far end telephone or speakerphone system are stable. A first half-loop includes gain contributions from a feedback path extending from a local speakerphone microphone to a hybrid line interface, which couples the speakerphone to the telephone network line, and subsequently to a local loudspeaker. A second half-loop defines a feedback path from a line receive channel to a transmit channel. Gain contributions are input into a system controller which determines gain values for each of the half-loops to accurately set the proper gain switching mode.
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申请公布号 |
US5612996(A) |
申请公布日期 |
1997.03.18 |
申请号 |
US19950531992 |
申请日期 |
1995.09.21 |
申请人 |
ROCKWELL INTERNATIONAL CORPORATION |
发明人 |
LI, XU |
分类号 |
H04R3/02;H04B3/20;H04B3/23;H04M1/60;H04M9/08;(IPC1-7):H04M9/08 |
主分类号 |
H04R3/02 |
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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