发明名称 |
Method and means of minimizing simulcast distortion in a receiver when using a same-frequency repeater |
摘要 |
Simulcast distortion in a receiver when using a same-frequency repeater is minimized by applying double modulation to a signal that is broadcast to the same-frequency repeater. A voice signal is applied without delay as AM on a carrier to a modulation index of up to 30%, and the same signal is also applied as FM on the same carrier with a time delay equal to the time delay in the same-frequency repeater. The same-frequency repeater detects the AM and applies the detected signal as FM on a carrier that is rebroadcast. Received FM signals are thus delayed by substantially the same amount whether they are received from the original broadcast or the same-frequency repeater.
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申请公布号 |
US4363129(A) |
申请公布日期 |
1982.12.07 |
申请号 |
US19800215589 |
申请日期 |
1980.12.11 |
申请人 |
MOTOROLA, INC. |
发明人 |
COHN, JONA;DAVIDSON, ALLEN L.;VAN DEN HEUVEL, ANTHONY P. |
分类号 |
H04B7/155;H04B7/26;H04B14/00;H04H20/67;(IPC1-7):H04B7/16 |
主分类号 |
H04B7/155 |
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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