发明授权
- 专利标题： Apparatus for detecting a signaling channel during scanning including a controlled frequency converter circuit and a controlled filter bandwidth, and a method therefor
- 专利标题（中）： 用于检测包括受控变频器电路和受控滤波器带宽的扫描期间的信令信道的装置及其方法
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申请号： US236736申请日： 1994-05-02
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公开(公告)号： US5511235A公开(公告)日： 1996-04-23
- 发明人: Minh H. Duong , Donald A. Dorsey , Robert M. Johnson, Jr.
- 申请人： Minh H. Duong , Donald A. Dorsey , Robert M. Johnson, Jr.
- 申请人地址： IL Schaumburg
- 专利权人： Motorola, Inc.
- 当前专利权人： Motorola, Inc.
- 当前专利权人地址： IL Schaumburg
- 主分类号： H03J1/00
- IPC分类号： H03J1/00 ; H03J3/08 ; H04B1/40
摘要：
A receiver has a channel scan mode of operation and a communication mode of operation. In the channel mode of operation, the passband of a filter is narrowed relative to the passband of the filter in the communication mode. According to another aspect of the circuit, a local oscillator is selectively phase locked to an internal clock during channel scanning and locked to the incoming signal during a communication mode operation.
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