Adaptive A/D converting device for adaptively converting and inp

Details Adaptive A/D converting device for adaptively converting and inp Adaptive A/D converting device for adaptively converting and inp

1996-02-22

1998-08-04

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

341120, H03M 134

Patent

active

057900612

ABSTRACT:
In an adaptive A/D converting device for adaptively converting an input analog signal (Vin) into an output digital signal (Dout), a reference voltage generating unit (11) generates lower and higher limit reference voltages (Vrl, Vrh) with a predetermined difference voltage (Vd) kept therebetween. A main A/D conversion unit (12) converts the input analog signal into an original digital signal (Dor) having a constant quantizing error. A control section (13) controls the lower and the higher limit reference voltages so that the input analog voltage always lies in an observation allowable range defined therebetween. A modifying section (14) modifies the original digital signal into the output digital signal having the constant quantizing error.

REFERENCES:
patent: 3411153 (1968-11-01), Steele
patent: 4251802 (1981-02-01), Horna
patent: 4642694 (1987-02-01), Yamagishi et al.
patent: 4749984 (1988-06-01), Prost et al.
patent: 4823130 (1989-04-01), Wright et al.
patent: 4831382 (1989-05-01), Debus, Jr. et al.
patent: 5389927 (1995-02-01), Turney et al.

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