发明名称 |
System and method for recovering a pilot tone in a local multipoint distribution system signal |
摘要 |
An intermediate frequency signal (50) is received by a difference frequency generator (43). The intermediate frequency signal (50) includes a pilot tone frequency. A band pass filter (64) removes frequencies surrounding the pilot tone frequency. A phase lock loop (66) generates a pilot tone signal from the pilot tone frequency. A divisor (74) divides the frequency of the pilot tone signal by a specified number. A second phase detector (76) determines a frequency difference between the pilot tone signal and a stable frequency signal generated by a stable frequency oscillator (78). A control voltage for a difference frequency voltage controlled dielectric resonant oscillator (84) is adjusted based on the frequency difference. A system frequency signal (48) is downconverted to an intermediate frequency signal (50) using a difference frequency signal (54).
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申请公布号 |
US6456823(B1) |
申请公布日期 |
2002.09.24 |
申请号 |
US19990344747 |
申请日期 |
1999.06.25 |
申请人 |
RAYTHEON COMPANY |
发明人 |
BLACK MICHAEL F. |
分类号 |
H03J7/06;H03J7/28;H04L27/00;(IPC1-7):H04H1/00 |
主分类号 |
H03J7/06 |
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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