Noise detector

Details Noise detector Noise detector

1985-06-21

1987-03-03

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455222, 455225, 455303, H04B 110

Patent

active

046481273

ABSTRACT:
Noise detector for selecting noise pulses from a non-limited FM radio broadcast signal modulated on a carrier, comprising an amplitude detection circuit and a signal comparison circuit. This signal comparison circuit produces a detection signal when its input signal exceeds a threshold level which varies with the average input level of the noise detection, for example, the average field strength. A noise selection being adapted to the human ear and based on the ratio between the noise pulse amplitude and the average input level is realized by means of a logarithmic level detection circuit. The logarithmic conversion therein renders a simple setting of the value of ratio possible, and provides a dynamic compression.

REFERENCES:
patent: 4479252 (1984-10-01), Souchay et al.

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