发明名称 |
WIRELESS SOUND MONITORING APPARATUS WITH SUBAUDIBLE SQUELCH CONTROL |
摘要 |
In a wireless sound monitoring system, a sound activated switch (20) responsive to sounds over a predetermined level turns the transmitter on and generates an inaudible tone (30). A delay circuit causes the tone to be terminated before the transmitter is turned off. In the receiver a mute circuit responds to the tone to control the output of a loudspeaker, and thus the tone prevents a squelch tail from being heard. The monitoring unit includes a pulse generator to transmit the tones at regular intervals. At the receiver, if the tones are not detected in a predetermined period of time, a distinctive audio tone will be generated to alert the user.
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申请公布号 |
WO9718648(A1) |
申请公布日期 |
1997.05.22 |
申请号 |
WO1996US16963 |
申请日期 |
1996.11.01 |
申请人 |
GERRY BABY PRODUCTS COMPANY |
发明人 |
NEWMAN, PERRAN, V., L.;FREESE, THEODORE, B.;LINDENBERGER, GARY, C. |
分类号 |
G08B21/02;H04B1/40;(IPC1-7):H04B17/00 |
主分类号 |
G08B21/02 |
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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