How do I perform a frequency sweep on a .WAV file?

Hello,

I found the following code online and am using it as a sort of template for performing a frequency sweep on a .WAV file in MatLab.

wave_file = 'name.wav';
[wave_data_time, sample_rate] = wavread('name.wav');
N_temp = length(wave_data);
N = 2^nextpow2(N_temp);
buff = floor((N-N_temp)/2)+1;
Nyq = sample_rate/2;
df = sample_rate/N;
f = -Nyq:df:Nyq-df;
wave_data_time_pad = zeros(size(f));
wave_data_time_pad(buff:buff-1+N_temp) = wave_data_time;
wave_data_freq = fftshift(fft(wave_data_time_pad));
figure;
plot(f,real(wave_data_freq),'b-',f,imag(wave_data_freq),'r-');

However, after compiling, I am recieving this error:

Undefined function or variable 'wavread'.

Error in freq_sweep_ECE223 (line 2)
[wave_data_time, sample_rate] = wavread('name.wav');
 

Is there an alternative function or approach that newer versions of MatLab supports? Also, is there an easier way to perform a frequency sweep on an input audio file using the spectrogram function in MatLab?

Many thanks!

Answer 1

[Star Strider]

‘Is there an alternative function or approach that newer versions of MatLab supports?’

Yes. See the documentation on the audioread (link) function, and its many friends.

‘Also, is there an easier way to perform a frequency sweep on an input audio file using the spectrogram function in MatLab?’

The spectrogram function will likely do what you want. Try it!