Dear Community,

I'm a student and I'm going to realize a project with Puredata. The idea is a "Virtual DJ" that analyses sound files from a directory. Depending to their velocity (bpm) and the average frequency of the sound signal I want to classify them into an array.
Second I want to analyse the environment in realtime. With the webcam and the microphone I want to find out the loudness and the average color value.
Everytime when a song ends, the new one should be selected considering the information about songs in the array.

I'm an newbie and don't know much about Puredata. Just some working with the standard objects.I have some programming experience with Java, PHP and a little bit of C.

I would be really appreciated if one of you could help me out with some good tutorials to start with. And with ideas how to realise these analysing issues:

• How to analyse sound files from one directory? BPM and average Freq. of sound signal.
• How to analyse in real time microphone and webcam?

thank you a lot,
Michael

@rubini said:

• How to analyse sound files from one directory? BPM and average Freq. of sound signal.

If you have easily detectible accents in your sound file (i.e. a staccato melody with heavy accents on the beats, or percussive samples) you can use [bonk~] to detect those, then connect it to a BPM detector. I have attached this patch that I use for detecting tap-tempo. If you connect the bang object that is used to determine the tempo to the outlet of [bonk~], I believe you can get the BPM.

For getting the frequency you can use [fiddle~]. See its help file for detailed info.

I assume you need such a patch for analyzing your audio input in real-time, if not, it is better to make all of the analysis in advance, and change the parameters of your patch in the way you want anytime you load a new sound file...

http://www.pdpatchrepo.info/hurleur/TapTime.pd

[bonk] and [fiddle] can be tricky depending on your sound source. Depending on what you need to measure [env~] (to track volume) can be very useful especially with [moses] to watch thresholds. But if bonk works use it. Its simpler to use and in many cases cheaper.

[beat] [rhythm] may be useful after the initial analysis.

Sounds like a job for the mystical aubio libraries. I'm pretty sure that they are C libraries and as such you'd have to create your own external binaries, this is what bonk~ and fiddle~ are I f I am not mistaken.