05812590 is referenced by 11 patents and cites 11 patents.

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.

Title
Frequency spreading clock modulation
Application Number
8/608451
Publication Number
5812590
Application Date
February 28, 1996
Publication Date
September 22, 1998
Inventor
Mark Robert Burns
South Elgin
IL, US
Alexander Wayne Hietala
Cary
IL, US
Gregory Redmond Black
Vernon Hills
IL, US
Agent
Randall S Vaas
Assignee
Motorola
IL, US
IPC
H04R 15/00
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