Hello people,
I'm trying to build a patch with which I can locate a sound source with microphones (right now using the Playstation Move Camera with the build in 4 channel microphone array). So far I found out that there are 3 ways to locate sound sources (correct me if I'm wrong):
- Energybased method:
Basically you check the "loudness" of the sound with at least two different microphones in a microphone array. By doing this the microphone which is further away to the sound source gives a signal which is more quiet, so you can roughly determine the location. Problems:
- You need a completely quiet room for best results
- Walls reject the sound wave, which gives irregularities
- Beamforming:
You get the direction of the sound by delaying the array signals and summing them up, thus creating a direction response of the array. How the exact process works and why is a mystery to me so far.
- Time Delay Estimation-based Localization:
You calculate the delayed time of the amplitudes peaks and get the result in milliseconds. By this you can determine which microphone is closer to the sound source
Attached is a small patch where I tried out the energy based method with the "bonk" utility, the results I get with that are quite sloppy
Anybody there who already tried something with locating sound in pd? Or got any good advice?
Thanks in advance,
Matthias
Mathias, Are you familiar with Interferometry? Used in localization of electromagnetic signals, among multitude of other applications. http://en.wikipedia.org/wiki/Interferometry Zax From: m.schaefer@uni-weimar.de Date: Sun, 9 Dec 2012 23:15:31 +0100 To: pd-list@iem.at Subject: [PD] Sound localization
Hello people,
I'm trying to build a patch with which I can locate a sound source with microphones (right now using the Playstation Move Camera with the build in 4 channel microphone array). So far I found out that there are 3 ways to locate sound sources (correct me if I'm wrong):
- Energybased method:
Basically you check the "loudness" of the sound with at least two different microphones in a microphone array. By doing this the microphone which is further away to the sound source gives a signal which is more quiet, so you can roughly determine the location. Problems:
- You need a completely quiet room for best results
- Walls reject the sound wave, which gives irregularities
- Beamforming:
You get the direction of the sound by delaying the array signals and summing them up, thus creating a direction response of the array. How the exact process works and why is a mystery to me so far.
- Time Delay Estimation-based Localization:
You calculate the delayed time of the amplitudes peaks and get the result in milliseconds. By this you can determine which microphone is closer to the sound source
Attached is a small patch where I tried out the energy based method with the "bonk" utility, the results I get with that are quite sloppy
Anybody there who already tried something with locating sound in pd? Or got any good advice?
Thanks in advance,
Matthias _______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
-
Eran Sachs -
Matthias Schäfer