Real time octave analysis

FFT and 3rd octave display of an incoming analog input signal.

Description

This is an extension of the real time FFT demo provided with the data acquisition toolbox (demoai_fft). It adds digital third octave filtering to the incoming data stream.

Works with any analog input source from the Data Acquisition Toolbox.

This uses a few files from the Octave Toolbox, with slight modifications and additions. The necessary files are included in this download, but you should get the original (see Contributing Files, below).

Acknowledgements

The author wishes to acknowledge the following in the creation of this submission:
octave
This submission has inspired the following:
Sound Level Meter

• Required Products: Data Acquisition Toolbox
• MATLAB release: MATLAB 6.5 (R13)

[Boyko Stoimenov]

Still haven't tried it (don't have the DAQ toolbox), but if you're going to use this submission, take a look at my BUG warning on 'octave'. (Sorry for its ugly formatting, I didn't know new lines are ignored)

[steve lawson]

very nice example of using fft on a live data stream, works well with MCC daq as well as soundcard. Easy to use with minimal knowledge of DAQ toolbox

[mohamed fazal]

This toolbox is very useful for the reasearch about the octave analysis

[Andrew Kibler]

Change line 332 TimerFcn to TimerAction for it to work for me (Matlab R12), after that works well!

[meng qinglin]

I've not read it carefully,however,from the result of it I think it is good.
The figure it give tells me the voltage ?spectram and Octave.That is good.