Noise cancelling circuit and arrangement

Details Noise cancelling circuit and arrangement Noise cancelling circuit and arrangement

1996-02-12

1998-03-03

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341143, 341118, H03M 166

Patent

active

057240388

ABSTRACT:
A noise cancelling circuit (10) is used with a D/A converter, the converter including a first modulator (11) and a data output. The circuit (10) has an error measuring arrangement (12, 13, 14) for measuring a quantization error signal of the modulator (11). A filter (19) receives the error signal end provides a fired error signal. A filter compensator (17) is coupled to the data output and provides a compensated output. A scaler (15) is coupled to receive the filtered error signal and provides a scaled filtered error signal. A second modulator (16) is coupled to receive the scaled filtered error signal and provides a single bit stream of error data. A summing arrangement (18) sums the single bit stream of error data and the compensated output from the first modulator and provides a corrected output, such that the error signal is filtered, sealed and modulated end the data output is compensated such that the corrected output is obtained having a substantially reduced quantization error.

REFERENCES:
patent: 5068661 (1991-11-01), Kaneaki et al.
patent: 5235334 (1993-08-01), Manvar et al.
patent: 5323157 (1994-06-01), Ledzius et al.
patent: 5414424 (1995-05-01), Cabler
patent: 5585802 (1996-12-01), Cabler et al.

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