why should we multiply the number of samples with sound frequency to calculate the sine wave?

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joly Alipor 2020-7-6

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评论： joly Alipor 2020-7-6

I have a code that aims to produce sine waves for durations of interest. in line related to creating sine wave, it's written:

tone_dur = sin(2*pi*freqs*t);

t is the number of samples needed for each tone duration and freq is the tone frequence (500 Hz). What I don't get is that why should we multiply the number of samples with sound frequency to calculate the sine wave? I don't get the rational!

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Geoff Hayes 2020-7-6

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joly - I think that t is usually a time array (in seconds). From fft examples, t can be initialized as

Fs = 1000;            % Sampling frequency                    
T = 1/Fs;             % Sampling period       
L = 1500;             % Length of signal
t = (0:L-1)*T;        % Time vector

Then you should be able to continue as before.

If t were just the number of samples, i.e. a scalar, then tone_dur would be a scalar value as well....and I don't think that is exactly what you want.