| Lecture
4A Wave Basics Wave Measures Wave Collisions Interference Reflect,Refract, & Diffract Sound Waves Doppler Effect WaveSimulation 1 Infrasound Recording Processing Examples WaveSimulation 2 |
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| Processing of Infrasound |
Determining the Direction of Arrival
Desired bandwidth relation to sampling frequency
and on the distance between microphones. distance, Ls
6
Hz corresponds to a Lmax of 28 m
Incoming direction of the recorded signal, a .
The azimuth a
of an arriving signal can be written as
Calculation of phase differencies using Crosscorrelation
offset reduction and normalisation
3. The calculation of cross-correlation rxy(k)
for x=1 and y= 2..3
k is -8..8
maximum cross correlation - parable method
Calculation of amplitude spectra
input signal 128 point vector
64 point amplitude spectra
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