MATLAB: How to generate a noisy sound

frequency bandsound

I want to generate a sound within the band of [33k Hz 35k Hz] for 8 second. The sound is used for hearing test, so I need a sound with mixed frequency within the range. How can I do that?
Thanks

Best Answer

The upper limit of human hearing is about 20 kHz, so they won’t be able to hear the signal.
This will generate it:
Fs = 44100;                                 % Sampling Frequency
NrFreqs = 5;                                % Number Of Frequencies To Use
LoFreq = 33E+3;                             % Low Frequency Limit
HiFreq = 35E+3;                             % High Frequency Limit
t = linspace(0, 8, Fs*8);                   % Time Vector
fv = linspace(LoFreq, HiFreq, NrFreqs);     % Freqency Vector
tm = bsxfun(@times, t, fv'*2*pi);           % Create Time Matrix
sm = sum(sin(tm));                          % Create Signal Vector
sound(sm*100, Fs)                           % Listen To Result
Related Question