Easing Out The Harmonics

1. Mistake of the (last two) recording days:
plugging the mic into the headphones port. That explains why Aniron and the other recordings failed!

2. Data sheets:
for this night’s recordings (for orientation and the original titles of the recordings)

Oct-2-HRIR-sheet

Oct-2-HRIR-sheet2

3. Final recording setup:
(for files 73, 74)

photo-5

4. Spectrograms:
from the last three sessions, shown together for comparison.
[barring the ones from Sep25, all have been generated by spectrogram ( signal, 2^14, [ ], 2^12, 44100, ‘yaxis’) ]

MATLAB Handle GraphicsWhat are those blue valleys?

The ones below are all generated form the left channels of the following recordings:

  • 44.1 kHz ?-Bit WAV    | small speaker
  • 44.1 kHz 32-Bit WAV | big speaker (low volume)
  • 44.1 kHz 32-Bit WAV | big speaker (high volume)

What these labels mean:

small speaker : X-mini II Capsule Speaker | Model XAM4 | website | screenshot of specs
big speaker     :

MATLAB Handle Graphics MATLAB Handle GraphicsDo the regular gaps indicate harmonics still?MATLAB Handle Graphics

Looking closely at just the harmonics of the sine wave:

MATLAB Handle Graphics MATLAB Handle GraphicsThis little speaker got distorted!MATLAB Handle Graphics MATLAB Handle GraphicsSome faint green lines are still around…

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