Hi Oryoki,
I still have to check if the MT2496 digital input does
resampling or not. I checked the PDAudio CF and it does not.
For this type of test I normally follow this procedure:
Create an "impossible" file with samples alternating among -max and
+max (-32700,+32700,-32700,+32700,....)
Play the file through a digital output
Record the digital output with the sound device I'm willing to test
Analyze the file to see if samples have the same values as the original fil=
e
If the tested device is ok I see exactly the same values...
If the tested device does resampling the values will be greatly
attenuated by the digital filter
With this procedure I verified that the PDAudio, the RME Digi96
boards and the MAUDIO Delta 1010 keep the digital data as is.
Now my MT2496 is being disassembled to make some modifications to add
a remote control.
If it will work again I'll do the digital input test...
Gianni
At 23.57 18/10/2005, you wrote:
>Gianni,
>
>Thanks very much for sharing these test results.
>Since manufacturers don't appear to use the same
>tests to arrive at a signal to noise figure, we
>can't use their published S/N as a means of comparison.
>Your relative rankings of mic S/N are the next best
>thing.
>
>Your original message didn't mention if the mics were
>powered by a separate battery box, or from the recorders
>directly. This could make a difference, as Rob D.'s
>tests with Sony Hi-MD and Rolls battery box have shown.
>
>I would be very interested to find out if you
>were able to hear any difference in recordings
>made in the following two ways, assuming you use the
>same mics in both cases.
>
>1. CoreSound Mic2496 --SPDIF--> MAUDIO MT2496 --> 2GB CF
>
>2. CoreSound Mic2496 --TosLink--> CoreSound PDAudio CF -->
> iPaq 3870 --> 2GB CF
>
>The digital output of the Mic2496 *should* be passed through
>and recorded in an identical manner by both recorders.
>If this is true, the $350 M-Audio MicroTrack could still
>prove to be a cost-effective tool.
>
>--oryoki
--------------------------------------------------------------
Gianni Pavan
Email
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universita' degli Studi di Pavia
Via Taramelli 24, 27100 PAVIA, ITALIA
Tel +39-0382-987874
Fax +39-02-700-32921
Web http://www.unipv.it/cibra
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