Re: Audio signal

[Matthias Brennwald]

On 18.11.2007, at 16:54, Pol Moreno wrote:

> But why should I remove the Fs from sin(..)?
>
> Isn't it suposed to be there?

The sampling rate is used to determine the time values of your signal  
samples, nothing more. Why would you want to put in Fs in to the sine  
function?

Imagine an analogue sine signal with a frequency f0, i.e. y = sin  
(2pi x f0 x t). Note that the only arguments of the sine function are  
the frequency f0 and the time t. If this signal is digitized with a  
sampling frequency Fs, the values of the sine function will be  
sampled at time 1/Fs, 2/Fs, 3/Fs, 4/Fs,...  . The frequency f0 of the  
sine signal will not change. The sine function must therefore not  
depend on Fs.

(please keep discussions on the octave help list, so that others can  
contribute or profit)

Cheers
Matthias


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Matthias Brennwald
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