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发明名称
Methods and devices for reducing sidetone noise levels
摘要
The sidetone noise level in a wireless or wired telephone, for example, is reduced by adjusting both noise and signal levels and/or by improving the signal-to-noise ratio of such signals.
申请公布号
US2003228013(A1)
申请公布日期
2003.12.11
申请号
US20020163359
申请日期
2002.06.07
申请人
ETTER WALTER
发明人
ETTER WALTER
分类号
H04M1/58;H04M1/725;H04M9/08;(IPC1-7):H04M1/76;H04M7/00
主分类号
H04M1/58
代理机构
代理人
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