发明名称 |
Aural annunciator circuit for a receiver |
摘要 |
An aural annunciator circuit for a radio receiver and a radio transceiver incorporating such. The annunciator circuit is operative to generate an aural signal when a signal is transmitted to the receiver in a manner analogous to telephonic ringer circuitry of conventional telephonic apparatus. The aural signal is of a signal level of a relatively high magnitude when the receiver in which the aural annunciator circuit is embodied is configured in a closed configuration and the aural signal is of a relatively low magnitude when the receiver is configured in an open configuration.
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申请公布号 |
US5404582(A) |
申请公布日期 |
1995.04.04 |
申请号 |
US19920982342 |
申请日期 |
1992.11.27 |
申请人 |
MOTOROLA, INC. |
发明人 |
DEMURO, DAVID M.;TRANDAI, TONY A.;ALBERTH, JR., WILLIAM P. |
分类号 |
H04M1/00;H04M1/725;H04M11/02;H04M19/04;H04Q7/32;H04Q7/38;(IPC1-7):H04B1/38 |
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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