Apparatus which employs the variable weighing coefficients for a

Details Apparatus which employs the variable weighing coefficients for a Apparatus which employs the variable weighing coefficients for a

1992-03-13

1993-10-12

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, H04N 5213

Patent

active

052530639

ABSTRACT:
A ghosting cancel apparatus which can reduce the circuit scale through the use of a one-line memory to remove ghosting, comprises an A/D conversion circuit, a timing signal generation circuit, a one-line memory, a field number register, a calculation processing circuit, a transversal filter, and a D/A conversion circuit. The timing signal generation circuit supplies ghost cancel reference (GCR) field numbers to the field number register, write enable signal to the one-line memory, and read enable signals to a microprocessor inside the calculation processing apparatus. When the one-line memory receives write enable signals, and extracts GCR basic signals from the transversal filter to store them. When the microprocessor receives the read enable signals, and stores it in the waveform memory inside the calculation processing apparatus. The microprocessor performs calculation processing for compensation signals as a weighting coefficient for the transversal filter and sets and supplies it and as a result, removes ghosting from image signals.

REFERENCES:
patent: 4897725 (1990-01-01), Tanaka et al.
patent: 5025317 (1991-06-01), Koguchi et al.
patent: 5065241 (1991-11-01), Iga
patent: 5099328 (1992-03-01), Kobo et al.
patent: 5130799 (1992-07-01), Iga et al.
patent: 5144414 (1992-09-01), Nishi et al.
patent: 5161017 (1992-11-01), Sato

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