Circuit for attenuating disturbing noise signals

Details Circuit for attenuating disturbing noise signals Circuit for attenuating disturbing noise signals

1980-03-06

1982-01-26

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455219, 455235, 455244, 455249, 455303, H04B 110

Patent

active

043132154

ABSTRACT:
In the circuit according to the invention the entire FM-demodulator output signal is evaluated, that is to say the sum of the low-frequency signal and the d.c. voltage (AFC) component. The absolute value is produced therefrom and an attenuator circuit becomes operative in the low-frequency channel when the absolute value of the demodulator output signal exceeds a predetermined threshold value. This not only enables the suppression of spurious receptions, but also the suppression of intermediate receptions (the reception of two transmitters on the filter edges) and surging of noise. The circuit can be easily implemented in integrated circuit technique.

REFERENCES:
patent: 3769592 (1973-10-01), Espe
patent: 4132953 (1979-01-01), Martin
patent: 4156202 (1979-05-01), Takahashi

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