What are some good tools for emotion extraction from audio features?

Check out the MIR Toolbox:

They have a utility that extracts emotion time courses from raw audio. The time courses are based on empirically derived formulae for features that map to emotional expression.

Of course, the above is intended to deal with music, but in practice it deals directly with audio files, calculates many spectral and temporal functions (incl MFCC), and it's not clear to me that there's any reason not to use it on speech.

We use PRAAT in our lab. http://www.fon.hum.uva.nl/praat/. This does not directly measure "emotion," but it is flexible. If you don't mind using proxies like pitch, frequency, duration, onset time, and other measures of variability or entropy as measures of emotion, then it is quite useful. Our variable of interest is prosody, for which we use a script (which, I believe was freely available on the internet or elsewhere) We splice our audio files to include only the subject's vocal output and analyze using PRAAT. This gives an output in Excel, which allows for analysis.

OpenEAR is well known and efficient in the area. I think you would not face difficulty if you use it under Linux Ubuntu. it depend on the programming environment you work in because the OpenEAR codded in C++. even if you have different environment the features could be produced in arff files. Praat software also used for the same purpose praat.en.softonic.com/‎

Praat., clearly!

Also we use PRAAT or CSL speech KAI in our lab. They don't extract emotions but acoustical vocal features (of emotional speech) like the variation of pitch, energy, time, formants, etc. They are flexible but not friendly.

For Feature extraction I also reconmend opensmile. It is a Framework to extract a huge bunch of features in realtime. See either http://www.openaudio.eu/ or http://sourceforge.net/projects/opensmile/ for further information. This tool extracts spectral as well as prosodic and voice quality features. Additionally, signal preprocessing and adding statistical functionals is possible.

I have no good knowledge about emotion features extraction, but with earlier experience I think the wavelet transform offers good tool for preprocessing and feature extration.

Have a look on Bjorn Schuller's publications and you'll find some state of art tools (including opensmile) and other powerfull emerging methods for emotion recognition from audio.

Thanks everyone for your answers. Before this, I had been working with OpenEAR and OpenSMILE a bit. After reading your answers, I think I should have more of a look into PRAAT. It seems to be much more user-friendly and works on different platforms, which suits my needs. Also, I like the fact that it is quite intuitive - if I can visualize what I'm doing in the tool, it's so much easier to execute my plans. Moreover, there is some work on how people have extracted emotions using analyses of pitch, formant, spectral and voice quality features, etc. So I think I'll try to execute these ideas too, as a start before modifying them to achieve better results on my task.

@Lionel, thanks for the suggestion. I have read some of his work but I'll more closely follow him now.

Hi Tahir, some people whose work on speech emotion you may want to check include Eduardo Coutinho (e.g. https://www.academia.edu/1087299/Psychoacoustic_cues_to_emotion_in_speech_prosody_and_music), Petri Laukka (http://w3.psychology.su.se/staff/pela/), and Klaus Scherer (http://www.affective-sciences.org/user/scherer).

I will also mention one work of mine even though it is more towards art/design rather than generalisable analysis (https://www.academia.edu/842766/About_TreeTorika_Rhetorics_CAAC_and_Mao._book_chapter_) and perhaps of lesser interest to you. Have fun researching!

We use the MIR Toolbox, Psysound, Marsayas.

What kind of features can you obtain from Psysound, as I cannot found it anywhere?

What kind of software have you decided to use?

We use Praat

Is it possible to extract emotion with it?

Are there any ready to use classifiers, or I have to learn them myself?

OpenEAR software provid a C++ code which work properly under Unix, it extracts more than 6000 LLDs. 

where are classifiers in pratt software?

Hi, everybody. Someone knows how to use opensmile directly from python. Is it possible to include it as a library? or should it be used outside the language?

Yesid Ospitia Medina I have same question like you.. If anyone has idea plz share.

Rupali Kawade I can tell you at the moment that I have made the handling of open Smile outside the language. I have programmed a script in linux to extract the features, and asynchronously, the app developed in python consumes the results from a repository. I think it is all about implementing some integration strategy between the script you run in linux, and the prototype you may have in python. Of course, in the future it would be good to find a library similar to open smile that runs in a native way in python. In my case I have an advanced project, and I would have a huge effort if I make a change of that level now.