System for reconstituting, by filtering, an analog signal from a

Details System for reconstituting, by filtering, an analog signal from a System for reconstituting, by filtering, an analog signal from a

1982-05-06

1985-04-16

Smith, Jerry

Boots, shoes, and leggings

328167, H03H 700

Patent

active

045119929

ABSTRACT:
Method for the reconstitution, by filtering, of an analog signal, from a udo-analog signal obtained by a double, analog to digital, digital to analog conversions of the analog signal, with processing of the digital signal. In greater detail, the pseudo-analog signal, obtained by double analog to digital, digital to analog conversion of an analog signal, is applied to an active filter the impedance of which is controlled by the absolute derivative of the positive value of the pseudo-analog signal. The derivative is obtained by a circuit comprising an RC filter receiving the pseudo-analog signal and a memory controlling the value of the impedance of the filter. The invention has particular application to the restitution of graphic or iconographic documents which have been previously digitally encoded.

REFERENCES:
patent: 3646549 (1972-02-01), Bryden
patent: 3678416 (1972-07-01), Burwen
patent: 3706045 (1972-12-01), Salvert
patent: 3742395 (1973-06-01), Yoneyama
patent: 3753159 (1973-08-01), Burwen
patent: 3754236 (1973-08-01), Dotson
patent: 3889108 (1975-06-01), Cantrell
patent: 4038539 (1977-07-01), Van Cleave
patent: 4275453 (1981-06-01), Wagner

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