Automatic amplitude equalizer

Details Automatic amplitude equalizer Automatic amplitude equalizer

1995-09-25

1999-11-02

Chin, Stephen

Pulse or digital communications

Equalizers

Automatic

375232, 375233, 375235, H03H 730

Patent

active

059784156

ABSTRACT:
The invention provides an automatic amplitude equalizer for compensating an amplitude characteristic of an input signal, wherein a control signal for equalizing an inclination amplitude distortion of an input signal is detected making use of a pair of digital demodulated signals to compensate for the amplitude characteristic of the input signal with a high degree of accuracy and which can be constructed with a reduced circuit scale and at a reduce cost. The automatic amplitude equalizer includes a first-order inclination amplitude equalization section for compensating for an amplitude characteristic of an input signal in accordance with a first-order inclination amplitude characteristic, and a control section for discriminating a direction of variation of a value of a first one of a pair of digital demodulated signals originating from the input signal, detecting error information from the other, second one of the digital demodulated signals which is orthogonal to the first signal, and outputting a control signal for the first-order inclination amplitude equalization section based on a correlation between the error information and the direction of variation of the value of the first signal.

REFERENCES:
patent: 3727136 (1973-04-01), Schroeder et al.
patent: 3906347 (1975-09-01), Motley et al.
patent: 4097807 (1978-06-01), Fujimura
patent: 4237554 (1980-12-01), Gitlin et al.
patent: 4258340 (1981-03-01), Ryu
patent: 4466134 (1984-08-01), McNicol
patent: 4483009 (1984-11-01), Honda et al.
patent: 5394110 (1995-02-01), Mizoguchi

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