Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-09-16
1990-01-02
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358198, 358167, H04N 521
Patent
active
048917044
ABSTRACT:
System for asymmetrical signal transmission from a pair of transmission devices (AT,VT) through a pair of signal paths (ASL, ARL; VSL, VRL) each having at least one signal line (ASL, VSL) and one reference line (ARL, VRL) to a pair of receiver devices (AR', VR), two devices (AT, VT) of which having a supply reference potential (G1) in common and being coupled to one end of each of the two signal paths (ASL, VSL), and the other two devices (AR', VR) of which having a further supply reference potential (G2) in common and being coupled to the other end of each of the two signal paths (ASL, VSL). In order to prevent unwanted cross-talk in such a system, which cross-talk may be caused through the connections of the reference lines (ARL, VRL) of the two signals paths (ASL, ARL; VSL, VRL) to the two supply reference potentials (G1, G2), a differential stage (DS) for common mode suppression is disposed in at least one (AT) of the said devices between a pair of input terminals (IS, IR) and a pair of output terminals (OS, OR). If disposed in one of the said transmission devices the differential stage (DS) is coupled at one end through a signal terminal (IS) of the pair of input terminals (IS, IR) to a signal source (A) and through a reference terminal (IR) to one (G1) of the two supply reference potentials and at the other end through a signal terminal (OS) of the pair of output terminals (OS, OR) to the signal line (ASL) and through a reference terminal (OR) to the reference line (ARL) of one of the two signal paths.
REFERENCES:
patent: 4275270 (1981-06-01), de la Plaza
patent: 4433215 (1984-02-01), Wortman
patent: 4627076 (1986-12-01), Staal et al.
"Domestic or Similar Electronic Equipment Interconnection Requirements: Peritelevision Connector" CENELEC-1983 Ref. No. EN50049:198JE.
Hay, Thomas M. "Differential Technology in Recording Consoles and the Impact of Transformerless Circuitry on Grounding Technique" Audio Engineering Society Preprint 1981.
Vonk Franciscus T. J.
Wesche Cornelis A. M.
Goodman Edward W.
Groody James J.
Harvey David E.
U.S. Philips Corporation
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