Method and circuit for reducing distortion in a filtered signal

Details Method and circuit for reducing distortion in a filtered signal Method and circuit for reducing distortion in a filtered signal

1994-04-29

1996-02-06

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

333172, 455306, 327552, H03K 500

Patent

active

054898714

ABSTRACT:
A method and circuit for achieving reduced signal distortion in a filtered signal. The method involves connecting an input signal to a main path and a side chain path. The signal carried on the side chain path is then processed to generate a complementary signal which, when combined with the input signal carried by the main path, will produce a target output signal. The circuit includes a side chain processing stage, having a filter stage and a first subtraction stage, and a final processing stage. The input signal is carried on the side chain path to a filter path and a processing path. The signal carried on the filter path is filtered through the filter stage to generate a first filtered signal. The first filtered signal is then subtracted from the input signal on the processing path at the first subtraction stage to generate a complementary processed signal. The complementary processed signal is then subtracted from the input signal on the main path to generate the target output signal. The method and circuit achieve reduced signal distortion by performing the filtering functions on the side chain path and only subjecting the output signal to a single processing stage (at the final processing stage).

REFERENCES:
patent: 4223181 (1980-09-01), Simeau
patent: 4760602 (1988-07-01), Gibson et al.
patent: 4931743 (1990-06-01), Fukuda et al.

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