High dynamic range detector for indicating the quieting level of

Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...

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325364, 329146, H04B 116, H04B 1700

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active

041568486

ABSTRACT:
The pre-limited IF signal from an FM receiver is coupled to a pair of linear amplifiers in a cascade configuration. The outputs from the amplifiers are detected and passed to piecewise linear amplifiers. Each piecewise linear amplifier is designed to exhibit a gain characteristic which is dependent on the level of signals applied at its input. A summing circuit sums the piecewise linear amplified signals in predetermined proportion to thereby produce a DC signal which is linearly related to the receiver's quieting level.

REFERENCES:
patent: 3435353 (1969-03-01), Sauber
patent: 3525045 (1970-08-01), Von Recklinghausen
patent: 3673499 (1972-06-01), Avins et al.
patent: 3753120 (1973-08-01), Ohsawa
patent: 3965425 (1976-06-01), Peterson et al.

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