发明名称 |
MODULATION D'HORLOGE A ETALEMENT EN FREQUENCE |
摘要 |
<p>A communication device (104) comprises a receiver circuit (108) receiving a modulated receive signal. A reference oscillator (132) generates a first clock signal at a first frequency, the first clock signal having harmonics. Circuitry (130) coupled to the reference oscillator and to the receiver responds to the first clock signal to produce a signal used by the receiver to reduce the frequency of the modulating signal. A frequency spreading circuit (134) is also coupled to the reference oscillator to modulate the first clock signal with a frequency spreading signal to produce a modulated clock signal including modulated harmonic frequency components. The frequency spreading circuit selectively combines the frequency spreading signal and the first clock signal. A control circuit (114) controls the frequency spreading circuit to modulate first clock signal with the frequency spreading signal when the selected received signal includes a harmonic of the first clock signal.</p> |
申请公布号 |
FR2745449(B1) |
申请公布日期 |
2003.06.06 |
申请号 |
FR19970001940 |
申请日期 |
1997.02.19 |
申请人 |
MOTOROLA INC |
发明人 |
BLACK GREGORY R;HIETALA ALEXANDER W;BURNS MARK ROBERT |
分类号 |
H04B1/69;H04B15/04;(IPC1-7):H04B1/69;H04Q7/20;H04B7/24 |
主分类号 |
H04B1/69 |
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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