How to play a variation of frequency?

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jérôme TAÏEB 2018-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/421425-how-to-play-a-variation-of-frequency

评论： Walter Roberson 2018-10-3

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

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jérôme TAÏEB 2018-10-2

编辑：Walter Roberson 2018-10-3

在 MATLAB Online 中打开

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 2018-10-3

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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