Circuit for image signal transmission and reception by adaptive

Details Circuit for image signal transmission and reception by adaptive Circuit for image signal transmission and reception by adaptive

1991-05-16

1993-06-15

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, H04N 704, H04N 514

Patent

active

052204243

ABSTRACT:
A circuit for transmitting and receiving an image signal by means of an adaptive modulation in a system having a transmitter and a receiver. A low band image signal output the transmitter is transmitted to a noise reducer (101) of the receiver (20), to thereby restore the low band image signal from the transmitter. A high band image signal of the transmitter is delayed for a given time to be multiplied by a first adaption factor generated from a first adaption converter; and the multiplied high band image signal is non-linearly converted by a first nonlinear linear converter so as to be transmitted to a second nonlinear linear converter of the receiver. The transmitted high band image signal is converted non-linearly by the second nonlinear converter such that noise component of the high band image signal with lower amplitude is relatively reduced more significantly than that of the high band image signal with higher amplitude. The converted high band image signal is divided by a second adaption factor output from a second adaption converter to thereby restore the high band image signal from the transmitter.

REFERENCES:
patent: 2881427 (1957-11-01), Huber
patent: 4262304 (1981-05-01), Faroudja
patent: 4318126 (1982-03-01), Sassler
patent: 4459613 (1984-07-01), Faroudja
patent: 4779133 (1988-10-01), Sugimori et al.
patent: 4897832 (1990-01-01), Suzuki et al.
patent: 5016100 (1991-06-01), Citta et al.
patent: 5128757 (1992-07-01), Citta et al.

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