Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent
1985-03-27
1987-02-03
Rubinson, Gene Z.
Telephonic communications
Substation or terminal circuitry
Sidetone control or hybrid circuit
379409, H04B 320, H04M 908
Patent
active
046413391
ABSTRACT:
This invention is a technique for providing isolation between the two channels of a handsfree telephone subset without resorting to gain switching or gain variations in the transmission path. The invention involves separating the frequency spectrum into two portions and allowing the stronger signal to capture a major portion of that available spectrum. Switched capacitor filters are used to control the degree of frequency bandwidth allocated to each channel while the filters are clocked from a common source assuring no possibility of overlap in the frequency spectrum. The affect of varying the bandwidth is much less noticeable than varying the amplitude and, therefore, creates much less user irritation.
REFERENCES:
patent: 3567873 (1971-03-01), Peroni
"An Electrically-Programmable Switched Capacitor Filter" D. J. Allstot et al., IEEE Journal of Solid-State Circuits, vol. SC-14, No. 6, Dec. 1979, pp. 1034-1041.
IEEE Standard Dictionary of Electrical and Electronics Terms, second edition, The Institute of Electrical and Electronics Engineers, Inc. New York, N.Y., 1977, p. 94.
ITT Corporation
Meagher Thomas F.
O'Halloran John T.
Rubinson Gene Z.
Vaas R.
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