Analog to digital signal of logarithmic format converter and ana

Details Analog to digital signal of logarithmic format converter and ana Analog to digital signal of logarithmic format converter and ana

1977-07-12

1978-09-12

Stellar, George G.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324132, 328 26, 340347DD, H04B 320, G01R 102, H03K 1300

Patent

active

041139976

ABSTRACT:
Improvements in a digital echo canceller utilizing pseudo-logarithmic coding are disclosed which reduce the complexity and cost while improving the performance of the echo canceller. Specifically, there is disclosed an improved analog to pseudo-logarithmic converter, a first and a second embodiment of an improved pseudo-rms to dc converter, an improved .phi.(x) function generator, and an improved error detector.

REFERENCES:
patent: 2397961 (1946-04-01), Harris, Jr.
patent: 3194951 (1965-07-01), Schaefer
patent: 3875344 (1975-04-01), Bogart
patent: 4041334 (1977-08-01), Umeda
IBM Technical Disclosure Bulletin, vol. 5, No. 5, Oct. 1962, pp. 30-31, "Logarithmic Digital to Analog Converter", T. J. Harrison.

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