Tone detector circuit

Details Tone detector circuit Tone detector circuit

1980-12-22

1983-09-20

Pellinen, A. D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307522, 328136, H04H 500

Patent

active

044058373

ABSTRACT:
A low frequency tone detector filters out higher frequencies, then a latching circuit locks on when a given number of low frequency cycles are detected which have at least a predetermined peak amplitude. Thereafter, only a second given number of missing or low amplitude cycles will reset the latch. The circuit is particularly suited to use with AM stereophonic signals where a low frequency tone is added to the difference channel for providing mono/stereo indication and mode switching. The circuit can also provide an early detect for use by a scanning circuit in a receiver.

REFERENCES:
patent: 3558911 (1971-01-01), Chen
patent: 3717818 (1973-02-01), Herbst
patent: 3792290 (1974-02-01), Brocker
patent: 3953832 (1976-04-01), Streckenbach
patent: 4031463 (1977-06-01), Norberg
patent: 4066848 (1978-01-01), Darwood
patent: 4139851 (1979-02-01), Risko
patent: 4159398 (1979-06-01), Hilbert et al.
patent: 4216463 (1980-08-01), Backof et al.

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