发明名称 |
Frequency shift modulation automatic frequency correction circuit and method |
摘要 |
A method (900) and circuit (400) for automatic frequency correcting a frequency modulated (FM) digital signal determines a frequency offset value of the detected FM signal during a preamble portion of the FM digital signal, generates an offset corrected signal by removing the frequency offset value from a detected FM signal (440), and generates a frequency corrected signal (460). The frequency corrected signal is generated by selecting the offset corrected signal during the preamble portion, selecting the detected FM signal after the end of the preamble portion when a magnitude of the frequency offset value of the detected FM signal is below a predetermined threshold (445), and otherwise selecting the offset corrected signal after the end of the preamble portion.
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申请公布号 |
US6130921(A) |
申请公布日期 |
2000.10.10 |
申请号 |
US19970996900 |
申请日期 |
1997.12.23 |
申请人 |
MOTOROLA, INC. |
发明人 |
POWELL, II, CLINTON C;WEBSTER, JAMES RODNEY |
分类号 |
H04L25/06;(IPC1-7):H04L27/06 |
主分类号 |
H04L25/06 |
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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