发明名称 |
Method and apparatus for providing a squelch function on narrow band radio receivers |
摘要 |
Squelch circuitry for narrow band audio receivers which uses a sub-audible tone or coded signal to modulate the intermediate frequency in accordance with the presence of a desired broadcast signal and then detects the sub-audible tone frequency or coded signal in the modulated IF frequency to control the audio output of the receiver to an off condition when there is excessive noise.
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申请公布号 |
US6374095(B1) |
申请公布日期 |
2002.04.16 |
申请号 |
US19970966147 |
申请日期 |
1997.11.07 |
申请人 |
HONEYWELL INTERNATIONAL INC. |
发明人 |
DOYLE ROBERT S.;KOLBER MARK A. |
分类号 |
H03G3/00;H03G3/34;(IPC1-7):H04B1/16;H04B1/10 |
主分类号 |
H03G3/00 |
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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