Tone detector circuit

Details Tone detector circuit Tone detector circuit

H - Electricity

04

B

328/160, 325/73

H04B 1/16 (2006.01) H04H 5/00 (2006.01)

Patent

CA 1176312

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.

392870

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