H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/74
H04B 7/02 (2006.01) H04B 7/08 (2006.01)
Patent
CA 1128611
CANADA "CIRCUIT FOR PROVIDING AN INDICATION OF SIGNAL/NOISE RATIO" Abstract of the disclosure A circuit for providing an indication of the signal/noise ratio of a single frequency signal as received by a receiver has first and second signal paths extending from its input to a comparator contained in the circuit. The first signal path includes a narrow band-pass filter, whilst the second signal path includes a notch filter. Means are provided in each signal path, for integrating the output of the respective filter. The comparator compares the outputs of the integrating means and outputs when the output of the first signal path integrating means is equal to or greater than the output of the second signal path integrating means. The time which elapses between the receipt of the signal at the input and the beginning of the comparator's output provides an indication of the signal/noise ratio. Such circuits can be used in selecting receivers in multi-receiver arrangements.
312997
Fetherstonhaugh & Co.
Parker Bernhard D.
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