Signal-to-noise ratio measurement of intermittent signals

Details Signal-to-noise ratio measurement of intermittent signals Signal-to-noise ratio measurement of intermittent signals

1978-03-20

1980-01-22

Richardson, Robert L.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 57N, H04B 1700

Patent

active

041852427

ABSTRACT:
The signal-to-noise ratio of intermittent reception by a radio receiver from a push-to-talk transmitter is measured by comparing AGC voltage levels derived from a signal period with levels derived from the prior no-signal period containing noise only. The AGC voltages are applied to a pair of integrators having corresponding time constants and therefore normally having equal outputs. When a valid signal period is recognized, the output of one integrator is held to represent an integration of voltage levels during the prior no-signal period. The integrated signal thus held is thereafter compared with the running output of the other.

REFERENCES:
patent: 3238457 (1966-03-01), Boymel et al.
patent: 3302116 (1967-01-01), Free
patent: 3602819 (1971-08-01), Abbott
patent: 3831093 (1974-08-01), Walker

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