Detector for indicating frequency deviation peaks

Details Detector for indicating frequency deviation peaks Detector for indicating frequency deviation peaks

1985-01-23

1987-03-24

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455226, 455312, 455296, H04B 110, H04B 1700

Patent

active

046531165

ABSTRACT:
A detector for indicating reception disturbances during ultrashort wave broadcast reception by demodulating of intermediate frequency signals has a frequency modulated demodulator with a demodulation characteristic line formed so that a controlling region within which the output signal increases with increasing frequency deviation from a carrier frequency extends advantageously over the entire band width of the ultrashort wave intermediate frequency channel and is significantly greater than the maximum frequency deviation of the intermediate frequency carrier modulated with the basic band signal in the frequency, and the output signal of the frequency demodulator is supplied to an evaluating circuit at whose output the exceeding of a predetermined frequency disturbance deviation threshold is indicated by a logic signal.

REFERENCES:
patent: 3869673 (1975-03-01), Close
patent: 4245352 (1981-01-01), Karpowycz et al.
patent: 4254505 (1981-03-01), Bossert
patent: 4498195 (1985-02-01), Ooi et al.

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