linuxaudio.org

Am 30.01.2011 20:29, schrieb fons@kokkinizita.net:

quoted text
> 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.

>>

>> I´d 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

quoted text
> 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.
>

quoted text
> Ciao,

>

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