MATLAB: How to find the Sampling Frequency

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I have imported a sound file into Matlab using [sound,fs]=audioread('….')

I need to find the sampling frequency. I think that is fs, however when I import a different sound, my fs value does not change? Is there a difference between sampling rate and sampling frequency, and if there is how do I find the sampling frequency from the audiofile imported?

Best Answer

Yes, fs is the sampling frequency. Sampling frequency and rate are related to each other: frequency = 1/rate. And it is not strange that two files have the same sampling frequency. Most of the audio signals are recorded at a similar sampling frequency, e.g., 44.1 kHz.

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MATLAB: How to generate noise with particular frequency

Noise (‘white’ noise) is by definition broadband, so it does not have a specific frequency. You can create a 10 kHz signal with noise, but that is as close as you can get to doing what you want.

For example:

len = 15;                                       % Length (sec)
f   = 1E+4;                                     % Frequency (Hz)
Fs  = 8192;                                     % Sampling Frequency (Hz)
t   = linspace(0, len, Fs*len);                 % Time Vector
signal = sin(2*pi*f*t);                         % Signal (10 kHz sine)
sound(signal, Fs)                               % Original Signal
noise = signal + 0.1*randn(size(signal));
pause(15)                                       % Wait For First Sound To Finish Playing
sound(noise, Fs)                                % Noisy Signal

You could also create and use an audiplayer object with playblocking, instead of inserting a pause call.

MATLAB: Sampling Audio at 11025 sample/sec in MATLAB

See: Record and Play Audio for a full description of the process. Note that SampleRate defines the sampling frequency.

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