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How to play a variation of frequency?

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jérôme TAÏEB
jérôme TAÏEB on 29 Sep 2018
Commented: Walter Roberson on 3 Oct 2018
Hi,
1)Starting from a pure wave of a given frequency (4000 Hz) I can not implement this pseudo code to play a sound (pure wave) whose frequency decreases continuously from 4000 to 200:
demo matlab
t = (0:0.001:100)';
for n = 4000:-1:200
y = sin(2*pi*n*t)
sound(y,Fs);
end
How to implement this correctly?
2)same question but starting from an very short audio file or an sound sample
thanks

  3 Comments

Walter Roberson
Walter Roberson on 30 Sep 2018
Your code looks like it will work, but simply take a fair time ss it plays the sound about 3800 times.
jérôme TAÏEB
jérôme TAÏEB on 2 Oct 2018
corrected script:
t=0:0.001:100;
for n=200:1:4000
y=sin(2*pi*n*t);
sound(y,n);
end
Now:
How to create in format.wav the obtained result by adding and scripting ?
thanks
Walter Roberson
Walter Roberson on 3 Oct 2018
That code changes frequency in two different ways simultaneously. You should not do that. Either change the n used in the construction of y or else change the frequency used for playback, but do not do both.
Hint: changing the n used in the construction of y is much easier to put together into a single .wav file than if you change the playback frequency.

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