Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-12-23
1987-09-08
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358150, H04N 1704
Patent
active
046928022
ABSTRACT:
Trigger signals both at horizontal and vertical line frequency required for an oscilloscope are derived from the horizontal synchronization output stage of a television receiver without any direct electrical connection to the receiver. A pick-up coil or tuned pick-up circuit is positioned in the vicinity of the receiver. The signals induced in the coil or circuit are applied to a comparator. The output of the comparator is at the required TTL level to provide the horizontal trigger to the oscilloscope. If a vertical trigger is also required, the comparator output is applied to a frequency doubler circuit. The output of the frequency doubler circuit is divided by 525, the so-divided output constituting vertical trigger circuits for the oscilloscope. A monitoring circuit for horizontal sync signals is connected to the comparator output and indicates the presence of horizontal sync signals by activation of a light emitting diode.
REFERENCES:
patent: 2700699 (1955-01-01), Kaplan
patent: 2741722 (1956-04-01), Shields
patent: 3984862 (1976-10-01), Volz
patent: 4117511 (1978-09-01), Baer et al.
patent: 4417268 (1983-11-01), LaSota
"Indicating Frequency Meters", Radio Amateur's Handbook, p. 521, .COPYRGT.1963, Byron Goodman, Edt.
Briody Thomas A.
Groody James J.
Kostak Victor R.
NAP Consumer Electronics Corp.
Rich Marianne R.
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