How to generate a noisy sound?

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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

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Star Strider
Star Strider 2015-8-19
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
  4 个评论
Simon
Simon 2015-8-21
The sound testing is for rats, so the frequency is high. I'll increase the sampling rate to 88.2 KHz in case of alias. Thank you guys for your helps, the code works.
Star Strider
Star Strider 2015-8-21
My pleasure.
I’m curious as to the driver circuitry and transducer you’re going to use for that. (My rat never listens to me!)

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