Circuit for decoding traffic information message tone signals

Details Circuit for decoding traffic information message tone signals Circuit for decoding traffic information message tone signals

1985-05-21

1986-12-30

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Responsive to an input signal of particular predetermined...

455 45, 340905, 34082548, H04B 116

Patent

active

046335170

ABSTRACT:
An essentially digital circuit is disclosed in which a demodulated broadcast signal is digitized by an analog-to-digital converter and processed in three signal paths each including a tuned filter. The tuned filters have closely adjacent resonance frequencies, the same resonance curves, and the same resonance rises. The signals at the outputs of these three signal paths are so evaluated by means of four comparators and an RS flip-flop that the message tone signal appears at the Q output of the flip-flop only in the presence of the message tone frequency.

REFERENCES:
patent: 4450589 (1984-05-01), Eilers
patent: 4561115 (1985-12-01), Pfeifer

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