Communications: electrical – Selective
Patent
1975-01-15
1976-10-19
Farley, Richard A.
Communications: electrical
Selective
325397, 343 7AG, H04B 116
Patent
active
039874028
ABSTRACT:
A gain control and method therefor which allows the use of a single gang variable attenuator for the synchronous control of the gains of each channel of a multi-channel system of the type employing a separate transmission path for each channel. This is accomplished by inserting multipliers at the output of each transmission path and multiplying the path signals with a carrier signal the level of which is varied with a single gang attenuator. The level of the multiplier output signals vary in accordance with the level of the carrier signal. Where intelligence signals are to be inserted at the input of each transmission path these are multiplied with the carrier signal prior to insertion resulting in the recovery of the intelligence signal at the output of the multipliers located at the output of each path. An increased range of gain control can be achieved by inserting the attenuated carrier signal at the inputs of each transmission path.
REFERENCES:
patent: 2754492 (1956-07-01), Parker
patent: 2959674 (1960-11-01), O'Meara
patent: 2984741 (1961-05-01), Bronstein et al.
patent: 3366922 (1968-01-01), Kay
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