How can I work out the frequency range of a speech signal?

I'm currently writing my dissertation on the automatic recognition of emotional speech using Matlab. One of the features I want to extract is the frequency range of a sentence.

I can't for the life of me, work out how to go about getting the values I need. All I'm looking for is a piece of code which finds the highest frequency and the lowest frequency in the utterance. Then all I need to do is subtract the two for the range.

Any help would be greatly appreciated!

Answer 1

[Image Analyst]

See the "Signal Analysis Made Easy" webinar on April 9, 2015: http://www.mathworks.com/company/events/webinars/upcoming.html?s_tid=hp_ev_wbnr

In the meantime, check out the examples in the Signal Processing Toolbox: http://www.mathworks.com/products/signal/features.html#spectral-analysis, particularly those involving the pwelch() function.

Also check out this: http://www.mathworks.com/help/signal/examples/practical-introduction-to-frequency-domain-analysis.html?prodcode=SG&language=en

Answer 2

[Star Strider]

I would start with the documentation on Nonparametric Methods: Periodogram, Welch, and Lomb-Scargle PSD estimates, spectrogram, coherence, transfer function estimation. They might not all apply, but since you’re dealing with time-frequency details, some might.

Wavelets might also be appropriate for what you want to do, so consider the Wavelet Toolbox as well.