Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1995-11-03
1998-12-29
Vo, Don N.
Pulse or digital communications
Transmitters
Antinoise or distortion
375297, 455 63, 332126, H04K 102
Patent
active
058548114
ABSTRACT:
A distortion compensating circuit comprises a frequency control section, a filtering section and an eliminating section. Major frequencies are detected from an input signal including major signals having the major frequencies by a major frequency detector performing spectrum analysis of the input signal. Receiving the major frequencies, the frequency control section calculates distortion frequencies from the major frequencies based on predetermined formulae representing the nonlinear distortion. The predetermined formulae are stored in advance. The frequency control section generates frequency control signals indicating the distortion frequencies. After the input signal is divided into a first signal and a second signal, the filtering section extracts frequency components having the distortion frequencies from the first signal in response to the frequency control signals. The frequency components are eliminated from the second signal by combining the phase-reversed frequency component with the second signal by the eliminating section.
REFERENCES:
patent: 4811422 (1989-03-01), Kahn
patent: 5136267 (1992-08-01), Cabot
patent: 5252930 (1993-10-01), Blauvelt
patent: 5600676 (1997-02-01), Ramesh
NEC Corporation
Vo Don N.
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