Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1989-01-04
1990-07-31
Brinich, Stephen
Facsimile and static presentation processing
Facsimile
Recording apparatus
35821326, H04N 314
Patent
active
049454200
ABSTRACT:
The disclosure concerns photosensitive matrices and, more precisely, the read circuit connected to each of the output columns of the matrix. To reduce the noise of a transfer from a column to an output register, there is performed, N times successively, a transfer of the charge Qs to be read from the column to an intermediate storage zone, a duplication of this charge and a summation of the duplicated charges Qs*, and a restitution of the charge Qs to the column. If the transfer noises are decorrelated with respect to one another, the overall signal-to-noise ratio is improved in a ratio of N.sup.1/2. A fraction of the sum of the replica charges (for example the mean of the N replica charges) is transmitted to the output and constitutes the output signal of the read circuit.
REFERENCES:
patent: 3963942 (1976-06-01), Sequin et al.
patent: 4611234 (1986-09-01), Berger et al.
patent: 4685117 (1987-08-01), Arques
patent: 4695890 (1987-09-01), Boucharlat et al.
patent: 4752829 (1988-06-01), Kim
patent: 4833539 (1989-05-01), Berger
Proceedings of 5th International Conference on Charge-Coupled Devices, Sep. 1979, pp. 33-39.
RCA Review, vol. 40, No. 3, Sep. 1979, pp. 241-277.
Arques Marc
Berger Jean-Luc
"Thomson-CSF"
Brinich Stephen
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