Frequency spreading clock modulation

Details Frequency spreading clock modulation Frequency spreading clock modulation

1996-02-28

1998-09-22

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

331 18, 331 25, H04R 1500

Patent

active

058125906

ABSTRACT:
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.

REFERENCES:
patent: 4507796 (1985-03-01), Stumfall
patent: 4996684 (1991-02-01), Morley et al.
patent: 5241562 (1993-08-01), Partyka et al.
patent: 5263055 (1993-11-01), Cahill
patent: 5307372 (1994-04-01), Sawyer et al.
patent: 5430392 (1995-07-01), Matejic
patent: 5437060 (1995-07-01), Delamater et al.
patent: 5610955 (1997-03-01), Bland

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