发明授权
US07209725B1 Analog zero if FM decoder and embodiments thereof, such as the family radio service
有权
如果FM解码器及其实施例如家庭无线电服务,则模拟为零
- 专利标题: Analog zero if FM decoder and embodiments thereof, such as the family radio service
- 专利标题(中): 如果FM解码器及其实施例如家庭无线电服务,则模拟为零
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申请号: US09476092申请日: 2000-01-03
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公开(公告)号: US07209725B1公开(公告)日: 2007-04-24
- 发明人: David F. Sorrells , Michael J. Bultman , Charles D. Clements , Robert W. Cook , Joseph M. Hamilla , Richard C. Looke , Charley D. Moses, Jr. , Gregory S. Silver
- 申请人: David F. Sorrells , Michael J. Bultman , Charles D. Clements , Robert W. Cook , Joseph M. Hamilla , Richard C. Looke , Charley D. Moses, Jr. , Gregory S. Silver
- 申请人地址: US FL Jacksonville
- 专利权人: ParkerVision, Inc
- 当前专利权人: ParkerVision, Inc
- 当前专利权人地址: US FL Jacksonville
- 代理机构: Sterne, Kessler, Goldstein & Fox P.L.L.C.
- 主分类号: H04B1/28
- IPC分类号: H04B1/28 ; H04L12/56 ; H03K9/00
摘要:
A method and system for directly down-converting FM signals to demodulated baseband information signals that can be used to directly down-convert analog FM signals and digital FM signals to demodulated baseband information signals. In an embodiment, the method includes aliasing an FM signal at an aliasing rate substantially equal to the frequency of the FM signal or substantially equal to a sub-harmonic thereof; adjusting the aliasing rate in accordance with frequency changes on the FM signal to maintain the aliasing rate substantially equal to the frequency of the FM signal, and outputting a demodulated baseband information signal. The method optionally includes compensating for phase delays and/or other characteristics of the loop in order to maintain bandwidth and stability for the loop.
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