Patent
1979-11-05
1982-03-16
Konick, Bernard
179 1CN, 179170A, 179170R, H04M 176, H04B 310
Patent
active
043202578
ABSTRACT:
In a telephone system, compensation for transmission losses over any given section of the transmission path is achieved by inserting at a selected location in the telephone transmission path a variable gain amplifying means, sensing the amplitude of a multi-frequency tone signal received from a standard multi-frequency tone sending device located at a point in the telephone transmission path distant from said selected location, said tone sending device being adapted to emit multi-frequency tone signals within the voice frequency band at a predetermined reference level, and varying the gain of said amplifying means in accordance with the difference between the amplitude of said sensed tone signal and the said predetermined reference level. In order to provide compensation over a section of the telephone transmission path originating at a telephone instrument, without the requirement for additional equipment provided at the location of said telephone instrument, the standard tone sending device conventionally provided at such a telephone instrument may itself be utilised as the means for generating said tone signal. There is also described a telephone system enabling the establishment of a transmission path via a plurality of tandem connected telephone links, each established via a telephone switching system, provision for compensation of transmission losses being provided at a plurality of locations in said transmission path, in order substantially to reduce transmission losses throughout the system.
REFERENCES:
patent: 2154579 (1939-04-01), Parrott
patent: 3302175 (1967-01-01), Deracinois et al.
patent: 3360748 (1967-12-01), Fish et al.
patent: 3838230 (1974-09-01), Bohman et al.
patent: 3918003 (1975-11-01), Seidel
patent: 4017695 (1977-04-01), Jaconetty et al.
Konick Bernard
Myers Randall P.
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