Simple Tone Detector?
Steve N. wrote:
I think the tone detector-PLL is not too good a method. Getting the phase
shift to do a cancell will take an adjustable all-pass phase shifter. Not
impossible, but complex as well.
The PLL can correct phase as well as frequency of the cancelling tone - it's
trivially easy.
Bob
--
Everything gets easier with practice, except getting up in the morning!
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