How can I process audio to get frequencial information in real time?

I need to process an audio signal (recorded in real-time) to plot the frequency variation as a function of time.

I've programmed an autocorrelation LPC code to get the plot from a WAV file, but now I have to do that in real-time, getting the signal "From Audio Device" (DSP System Toolbox - Simulink).

Which blocks should I use to get that real-tome plot in Simulink?

Thanks. Xavi.

Answer 1

[Puneet Rana]

Try the Spectrum Analyzer block: http://www.mathworks.com/help/dsp/ref/spectrumanalyzer.html

It also has a 'spectrogram' mode that can show frequency variation across time.