Hadamard transformer using charge transfer devices

Details Hadamard transformer using charge transfer devices Hadamard transformer using charge transfer devices

1981-03-09

1983-06-21

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358133, 358213, 364515, 364725, 364826, H04N 514, G06G 712

Patent

active

043896731

ABSTRACT:
The Hadamard transformer comprises a charge transfer device having N rest electrodes preceded by N transfer electrodes, 2N reading electrodes, each rest electrode being positioned between a first reading electrode and a second reading electrode and 2N transfer electrodes located between each rest electrode and the associated reading electrodes. The transform also comprises an input circuit able to convert the samples into groups of proportional charges. In addition, it has means for injecting these charge groups beneath the rest electrode. It further comprises a differential charge reader with a positive input and a negative input, the reading electrodes being connected to the positive input and the reading electrodes to the negative input, as well as an output supplying the transformed samples. The transformer also comprises a control circuit having a first output connection connected to the rest electrodes and a second output connection connected to the transfer electrodes.
Application more particularly to the transmission, recording and reproduction of television pictures.

REFERENCES:
patent: 3792355 (1974-02-01), Miyata
patent: 3976826 (1976-08-01), Fullton, Jr.
patent: 4055756 (1977-10-01), Jolivet
patent: 4099250 (1978-07-01), Finnila et al.
patent: 4134134 (1979-01-01), Lux
patent: 4192004 (1980-03-01), Buerger
patent: 4245330 (1981-01-01), Rebourg
patent: 4293920 (1981-10-01), Merola

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