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Rms value of a signal having more than two frequencies
ksr
post Mar 16 2012, 05:36
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Hi guys,

I want to know how to calculate from a pcm file the following things...

1. Rms value of a signal when it is having single frequency and also multiple frequencies .
2. Rms value of harmonic components of a signal when it is having single frequency and also multiple frequencies .
3 Rms value of noise..

By using above values i want to calculate SNR, THD , THD+N.

Thanks in Advance
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Alexey Lukin
post Mar 17 2012, 06:59
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QUOTE (ksr @ Mar 16 2012, 00:36) *
2. Rms value of harmonic components of a signal when it is having single frequency and also multiple frequencies .

This is most easily done using windowed FFT spectrum and Parseval's theorem that links RMS of spectral components with RMS of the signal. You need to locate which spectrum parts correspond to harmonics and calculate their RMS, keeping aside the rest of the spectrum.


QUOTE (ksr @ Mar 16 2012, 00:36) *
3 Rms value of noise..

See answers to 1. and 2.
And also "Personal Computer Audio Quality Measurements".
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