Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-08-18
1980-08-05
Murray, Richard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358160, 307350, H04N 552
Patent
active
042165024
ABSTRACT:
A peak detector circuit is provided for detecting the maximum excursions of an amplitude varying signal. The circuit includes a network comprising a capacitor serially coupled to a charging impedance and having a time constant suitable for responding to the maximum excursions of the amplitude varying signal. A semiconductor means has an input terminal for receiving the amplitude varying signal and an output terminal coupled to the charging impedance for charging the capacitor toward the maximum excursions of the amplitude varying signal. The semiconductor means exhibits an impedance which is subject to increase with a decrease in current drawn therethrough. A controllable current sink is responsive to the amplitude varying signal at the input terminal of the semiconductor means and is coupled to the output terminal of the semiconductor means for drawing a component of current through the semiconductor means during the charging of the capacitor which is supplemental to the capacitor charging current drawn therethrough. The supplemental current component is of a sufficient magnitude to preclude increase of the impedance exhibited by the semiconductor means during the charging of the capacitor beyond a value which is substantially less than the charging impedance.
REFERENCES:
patent: 3624290 (1971-11-01), Hofmann
patent: 3835248 (1974-09-01), Harford
CA3120e, TV "Jungle" Circuits, RCA Linear Integrated Circuits Databook, pp. 355-358, 1977.
Meagher W. H.
Murray Richard
RCA Corporation
Whitacre E. M.
Yorks, Jr. W. B.
LandOfFree
Peak detector circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Peak detector circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Peak detector circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2283121