Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1975-12-02
1977-12-20
Konick, Bernard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
17910041G, 1791004M, 1791001B, 324 60C, 318662, H04N 580
Patent
active
040645398
ABSTRACT:
A device for measuring quantities of electric charges, or other electric parameters whose magnitudes can be obtained from measurements of quantities of electric charges. The device includes a capacitor having a measuring plate and another plate or an intermediate element. The electrical parameter is applied to the capacitor so that a charge representative of its magnitude is induced on the measuring plate. This induced charge is modulated at a frequency f.sub.o and at a frequency f.sub.1, the frequency f.sub.1 being less than f.sub.o /2. An electrical signal representative of the modulation of the induced charge is generated. This signal has a first component of frequency f.sub.o whose magnitude represents the quantity of the induced charge and a second component of frequency f.sub.1 whose magnitude varies according to the distance between the measuring plate and the location at which the electrical parameter is applied to the capacitor. The second component can be used as a correction signal which reduces errors due to changes in the said distance.
REFERENCES:
patent: 3126535 (1964-03-01), Streeter
patent: 3175205 (1965-03-01), Auyang
patent: 3198880 (1965-08-01), Toulon
patent: 3624284 (1971-11-01), Russell
patent: 3711641 (1973-01-01), Palmer
patent: 3872241 (1975-03-01), Adler
patent: 3873763 (1975-03-01), Janssen
patent: 3946367 (1976-03-01), Wohlmut
Dreyfus Gerard
Lewiner Jacques
Agence Nationale de Valorisation de la Recherche
Faber Alan
Konick Bernard
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