Question

Create a MATLAB script to record a few seconds of data from the computer microphone and then display the spectrogram for the recording. For example, I said into the microphone “compute this now”. Also interesting is whistles with increasing or decreasing pitch. A period of silence between sounds or utterances makes it easier to distinguish in the spectrogram. Use an ?_s that is compatible with the computer sound card (e.g. 44.1 or 22.05 kHz). Submit the spectrogram of the sound recorded with a short description of the sound. Gauge the frequency range that needs to be plotted based on what was recorded.

Answer 1

Matlab Code:

Fs = 44100 ; %Sampling Frequency

Y = audiorecorder; %Records audio with default sampling Frequency compatable with your device
disp('Start speaking.')

recordblocking(Y,5); % 5 seconds record
disp('End of Recording.');

sig = getaudiodata(Y); % convert into a vector signal
plot(sig)
title('Recorded Signal')
xlabel('Time')
ylabel('Amplitude ')
figure()
spectrogram(sig,128,120,128,Fs,'yaxis')

Output:

NOTE: Make sure you have a working audio recording device. The output may differ every time as the recorded signal is unique every time.