公开(公告)号：US5812590A

公开(公告)日：1998-09-22

申请号：US608451

申请日：1996-02-28

申请人： Gregory Redmond Black ,  Alexander Wayne Hietala ,  Mark Robert Burns

发明人： Gregory Redmond Black ,  Alexander Wayne Hietala ,  Mark Robert Burns

IPC分类号： H04B1/69 ,  H04B15/04 ,  H04R15/00

CPC分类号： H04B1/69 ,  H04B15/04 ,  H04B2215/064 ,  H04B2215/067

摘要： 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.

摘要翻译： 通信设备（104）包括接收调制的接收信号的接收机电路（108）。 参考振荡器（132）以第一频率产生第一时钟信号，第一时钟信号具有谐波。 耦合到参考振荡器和接收器的电路（130）响应于第一时钟信号以产生接收机使用的信号来降低调制信号的频率。 频率扩展电路（134）还耦合到参考振荡器，以用频率扩展信号来调制第一时钟信号，以产生包括调制谐波频率分量的调制时钟信号。 频率扩展电路选择性地组合频率扩展信号和第一时钟信号。 当所选择的接收信号包括第一时钟信号的谐波时，控制电路（114）控制频率扩展电路用频率扩展信号调制第一时钟信号。