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hi thanks for reply.....in this process i made one bit squarewave from the noisy sine wave ....then i applied filter in this square wave... its works....it helps in the frequency measurement but problem with peak to amplitude measurement is same :(
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If you want to avoid filtering and its hassle of cutoff and if you are serious then you can use fft. I assume you are interested in amplitude measurement rather than the time of peaks.
fft will tell you the amplitude of your tone directly and any power of noise outside your tone will be separated. You wil need to do some scaling though.
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