Telecommunications – Transmitter and receiver at separate stations – Single or vestigial sideband system
Patent
1988-09-02
1990-08-07
Safourek, Benedict V.
Telecommunications
Transmitter and receiver at separate stations
Single or vestigial sideband system
455 71, 455103, 455202, H04B 176
Patent
active
049474537
ABSTRACT:
In transparent tone-in-band communication systems a notch in the frequency band is usually formed and then the resulting spectrum is translated in frequency to an intermediate frequency range as part of the transmission process. In a transmitter of the present invention a more simple arrangement is used in which the notch is formed directly in an intermediate frequency range by using mirror filters to divide an input signal into two portions and supply respective mixers, each having one output sideband in the intermediate frequency range. The mixers receive different reference frequencies and the mixer outputs are supplied to a summing circuit whose output is passed to a band pass filter to remove the unwanted sidebands. The original frequency spectrum is restored at the receiver by mixer processes of shifting the two selected sidebands similar to, but the inverse of, those used in the transmitter.
REFERENCES:
patent: 2026613 (1936-01-01), Chireix et al.
patent: 2389356 (1945-11-01), Goldstein
patent: 2778877 (1957-01-01), Caruthers
patent: 3201691 (1965-08-01), Lyon
patent: 3271681 (1966-09-01), McNair
patent: 3586781 (1971-06-01), Jones
patent: 4675880 (1987-06-01), Davarian
"Single Sideband Principles and Circuits"; Pappenfus, Bruene and Schoenike, McGraw-Hill Book Co., N.Y., N.Y., 1964, pp. 31-41.
Ericcson Review, vol. 44, No. 1, 1967, pp. 34-52, N. Tangen et al., "Centralized Fundamental and Pilot Frequency Generating Equipment".
IEEE Conference on Communications, Boston; Jun. 19-22, 1983, vol. 1, pp. 245-249, A. J. Bateman et al.
IEE Conferences on Communications Equipment Systems, pp. 121-126, 1982.
A Filter Family Designed for Use in Quadrature Mirror Filter Banks, Johnson, 1980.
Bateman Andrew
McGeehan Joseph P.
National Research Development Corporation
Safourek Benedict V.
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