Writing an audio file

Dear people,

I am trying to write an audio which consists of part of 2500Hz 17 sec long and another silent part of 1 min in length.

FrequencySampling = 2500;                                     
duration = 17;
repeats=5;
filename='shock.wav';

t  = linspace(0, duration, FrequencySampling*duration+1);      
t(end) = [];                                                   
w = 2*pi*1000;                                                                          
                                                              
for i=1:repeats
    for k=1:duration
        s = sin(w*t);
        sound(s,FrequencySampling);
    end
    pause(77);                                                
end
audioWrite(filename,s,FrequencySampling);

When I use this code I am only able to write it for single 17 sec long 2500Hz tone. I want to inlcude 4 silent periods between 5 repeats of 17 sec long 2500Hz tone. How to do it? Please suggest.

Answer 1

[Walter Roberson]

FrequencySampling = 2500;                                     
duration = 17;
repeats = 5;
filename='shock.wav';

s = cell(2, repeats);

t  = linspace(0, duration, FrequencySampling*duration+1);      
t(end) = [];                                                   
w = 2*pi*1000;
n = sin(w*t);
z = zeros(1, 77*FrequencySampling);

s(1,:) = {n};
s(2,:) = {z};
s(end) = [];    %delete final silence
s = horzcat(s{:});

audioWrite(filename, s, FrequencySampling);

Repeating for duration is not needed, as your time vector already extends for the entire duration.

[Yanjika O]

IDK why but I a getting this error tho,

Cannot find an exact (case-sensitive) match for

'audioWrite'