Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy
Patent
1986-05-27
1987-09-01
Rubinson, Gene Z.
Telephonic communications
Telephone line or system combined with diverse electrical...
To produce visual-graphic copy
358281, 358284, H04M 1100
Patent
active
046913432
ABSTRACT:
In an amplitude-modulated or frequency modulated audio signal transmission system, a system for eliminating breakup of transmissions of photographs, negatives or any rapidly changing audio signal transmitted from one remote location to another over standard telephone lines and networks includes superimposing an audio carrier signal on the signal from the picture or information transmitting unit, in which the superimposed carrier is of a frequency different from that of the operating frequency of the transmitter yet within the telephone network bandwidth. A decoder is utilized at the receiver end which includes a peak filter tuned to the transmitter frequency which is followed by a deep notch filter to remove the superimposed carrier, so as to eliminate breakup of picture quality at the receiver end due to a rapid transition in amplitude or frequency of the signals derived from a dark portion of the picture or negative adjacent a light portion, such that breakup or interference introduced by the telephone network is eliminated from the received picture copy output. In one embodiment, a simple amplitude responsive measuring device utilizing a single LED indicator is used to set the gain of the decoder which when once set, need not be adjusted during transmission.
REFERENCES:
patent: 2289157 (1942-07-01), Whitaker
patent: 2290229 (1942-07-01), Finch
patent: 4313139 (1982-01-01), Logie
patent: 4485400 (1984-11-01), Lemelson et al.
patent: 4517531 (1985-05-01), Tan et al.
patent: 4561117 (1985-12-01), Kuhn
Connors Matthew E.
Rubinson Gene Z.
Tendler Robert K.
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