Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-11-12
1984-03-06
Psitos, Aristotelis M.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358330, 358342, 358340, 360 30, 360 20, 332 14, H04N 591, H04N 9491, H04N 576, G11B 504
Patent
active
044357346
ABSTRACT:
High resolution video signals of bandwidth up to 25 mHz are recorded magnetically or optically, or are transmitted on a communications channel carrier with superior fidelity by using novel electronic circuit system including implementations of an FM modulator, writing amplifier, and wideband discriminator which enable coding and decoding with high accuracy, low noise, and low interference. The video signals are used to directly modulate a square wave carrier using an FM technique employing a very low center frequency-to-bandwidth ratio without need for subsequent frequency translations. A writing amplifier provides gain needed for saturated recording with unique provisions to balance transition amplitudes for minimum second harmonic distortion without affecting the primary phasing of transitions. A novel multiwinding inductor and pulse discriminator implementation is capable of demodulating the very wide deviation FM signal with good cancellation of the second harmonic and fundamental FM carrier spectrums. Novel electronic circuit techniques are disclosed to provide high levels of performance with simple implementations of the electronic hardware.
REFERENCES:
patent: 3423540 (1969-01-01), Wortzman
patent: 3783410 (1974-01-01), Bruck
patent: 3811097 (1974-05-01), Dijkmans
patent: 4052740 (1977-10-01), Coleman, Jr.
patent: 4225873 (1980-09-01), Winslow
Hedberg David J.
Nilsson C. Gary
Block Robert B.
Psitos Aristotelis M.
VAS Corporation
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