Hi again,
As I mentioned in a previous post, I am designing an experiment that replicates recording a speaker array into microphones at different distances. After taking a series of basis functions for each speaker at each distance, I would then pick 1 or 2 speakers at random to play at each distance, and use my decoding function to determine which speaker is playing, and ultimately show that the error for this calculation increases with distance.
I now have my wave, medium, source, and sensor created correctly (I believe), however I am seeing a strange result when plotting 1 channel of my received waveform.
I expect to see one large transmitted waveform from the source, followed by another nearly similar but attenuated waveform (received at the sensor). However the waves seem to be "echoing" for lack of a better term. Below is the link to an image of the waveform...
http://tinypic.com/r/293d2kg/9
Has anyone seen anything like this happening before? Also, my 'PML inside' is set to false, as the microphones would be inside the absorbing outer layer and I only want to record the direct pulse. Thank you!