How to generate sound in Matlab?
57 views (last 30 days)
Show older comments
Nur Fauzira Saidin
on 17 Nov 2015
Commented: Chad Greene
on 17 Nov 2015
I want to generate sound for my sine wave but the sound did not come out. Is there something wrong with my code? Really need help, thanks.
fsampling = 1000;
f1 = 20;
f2 = 100;
f3 = 300;
fn1 = 150;
fn2 = 200;
fn1_normfreq = fn1/(fsampling/2);
fn2_normfreq = fn2/(fsampling/2);
x1 = cos(2*pi*f1*[0:1/fsampling:1.23]);
x2 = cos(2*pi*f2*[0:1/fsampling:1.23]);
x3 = cos(2*pi*f3*[0:1/fsampling:1.23]);
x = x1 + x2 + x3;
x(end) = [];
[b,a] = butter(2,[fn1_normfreq fn2_normfreq],'bandpass');
filtered_noise = filter(b,a,randn(1, length(x)*2));
y = (x + 0.5*filtered_noise(500:500+length(x)-1))/length(x)*2;
sound(y,fsampling)
0 Comments
Accepted Answer
Chad Greene
on 17 Nov 2015
Use
soundsc(y,fsampling)
which scales the sound before playing it.
3 Comments
Chad Greene
on 17 Nov 2015
You could repeat y as many times as you want. This plays y five times in a row:
y_five_times = repmat(y,1,5);
soundsc(y_five_times,fsampling)
To get y to play for a specified amount of time, you'll have to repeat y enough times to fill the desired length, then only play the number of samples necessary to meet the time requirement:
% Enter how long you want the signal to be in seconds:
Desired_length = 7.5;
% Number of samples necessary to make the sound the desired length:
num_samples = round(Desired_length*fsampling);
% Number of times y must be repeated:
num_repeats = ceil(num_samples/length(y));
% Create a vector of y repeated as many times as necessary:
y_long = repmat(y,1,num_repeats);
% Clip y_long to be exactly the desired length:
y_long_clipped = y_long(1:num_samples);
% Play the sound:
soundsc(y_long_clipped,fsampling)
More Answers (1)
Image Analyst
on 17 Nov 2015
For what it's worth, I have attached a demo that creates a weird sound and plays it.
0 Comments
See Also
Categories
Find more on Audio and Video Data in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!