Am 30.01.2011 20:29, schrieb fons@xxxxxxxxxxxxxxx:
On Sun, Jan 30, 2011 at 06:55:18PM +0100, Hartmut Noack wrote:
Am 30.01.2011 13:22, schrieb Arnold Krille:
Using a mobile phone to play the sinus-sweep
I dont really believe in the built-in speakers. Especially if we
talk about frequencies below 150Hz ;-)
and record it with a small mp3-
player should give you the ability to "measure" different source and target
positions in the acoustic space :-)
Gotta try that some day.
IÂd be very interested in such a usage-scenario. I got an old
Sharp-MD-recorder that came with a quite usable mini-mic...
A research assistant here did that last year - recorded his acoustic
measurement sweeps in mp3 format. Had to go back and do it all over
again... Whatever remains of a sweep after deconvolution is just junk.
Do you think, the same problem would arise with the MD-Recorder? ATRAC
is based on the same principles as MP3 so it may have the same
shortcomings when it comes to record material for HIFI-impulses.
As to the LF, many small devices such as mobile phones generate bass
by just exciting the miniature speaker at its resonance frequency.
Works well for kick drums etc. You get bass indeed, but nothing like
the original signal.
I really would not think about trying something like this. Maybe if one
attaches a little amp and a 6"-speaker to the headphones-out but not
whith the builtin.
Anyway: I think it should either be low-end-punk (recording snaps with a
small multimedia-device) or the real thing with real speakers and real mics.
The low-end method comes with the benefit of being easily available in
any situation whithout spending much time and money for gear. If one
sacrifices these benefits to make some half-way a little better kind of
thing, the whole thing becomes pointless and should be abandoned in
favour of the Hi-end method I think.
Ciao,
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