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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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albertoh
post Mar 17 2012, 13:03
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QUOTE (ksr @ Mar 16 2012, 04:36) *
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..


2.- Do a Fourier analysis of the PCM signal to get the harmonic components, then calculate the RMS value of each component.

3.- By definition, RMS value of (white) noise is zero.
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pdq
post Mar 17 2012, 13:38
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QUOTE (albertoh @ Mar 17 2012, 08:03) *
3.- By definition, RMS value of (white) noise is zero.

Huh? sad.gif
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