IPB

Welcome Guest ( Log In | Register )

Rms value of a signal having more than two frequencies
ksr
post Mar 16 2012, 05:36
Post #1





Group: Members
Posts: 17
Joined: 2-December 11
From: bangalore
Member No.: 95532



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
Go to the top of the page
+Quote Post
 
Start new topic
Replies
romor
post Mar 17 2012, 18:42
Post #2





Group: Members
Posts: 652
Joined: 16-January 09
Member No.: 65630



Are you serious?


--------------------
scripts: http://goo.gl/M1qVLQ
Go to the top of the page
+Quote Post
Porcus
post Mar 17 2012, 22:46
Post #3





Group: Members
Posts: 1794
Joined: 30-November 06
Member No.: 38207



QUOTE (romor @ Mar 17 2012, 18:42) *
Are you serious?


What part do you have issues with?

There are a few fallacies one could make when naively calculating as if everything were finite-dimensional. Passing to 'white noise measures to 0 in RMS' from naive calculation on the Fourier coefficients, is one of them. White noise as defined e.g. by http://en.wikipedia.org/wiki/White_noise#W...8white_noise.29 , is a fairly nasty mathematical object. It is not the time-derivative in the ordinary sense, of any 'signal' (defining a 'signal' to be a function from a time interval into the reals).


Edit: pdq, put ' in L2' before the '. Period!' wink.gif

This post has been edited by Porcus: Mar 17 2012, 22:53


--------------------
One day in the Year of the Fox came a time remembered well
Go to the top of the page
+Quote Post

Posts in this topic


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



RSS Lo-Fi Version Time is now: 24th April 2014 - 10:46