At 20.58 01/11/2006, you wrote:
>Can one assume that any soundcard advertising 24 bit, 96 or 192 kB
>sample rate can output supersonic freqs rather than having a 20 kHz
>low pass filter rolloff on the in's and out's?
>
>John
Hello,
a few days ago I posted a message about soundcard tests on SoftRock.
I think it may be interesting to this group, so please forgive the
cross-posting. I only tested the A/D sections; I have no info on the
output (D/A) sections. All tested cards work well in full-duplex, at
least with one channel in and one channel out.
----------------------------------------
Recently I performed more tests on different audio boards. Here are my results:
M-audio Audiophile 192
Bus: PCI
Maximum sampling rate: 192kHz
Useable band: 85kHz (limited by antialiasing filter and image rejection)
Maximum input signal: 2x 4V RMS, true differential input.
Dynamic range measured at 10kHz in 2.4kHz band: 123 dB
Note: noise increases approx. 5dB per 10kHz from 25kHz up. Too much
noise over 45kHz.
Creative Soundblaster USB model SB0490
Bus: USB 2
Maximum sampling rate: 96kHz - tested at 48kHz
Useable band: 24kHz (limited by antialiasing filter)
Maximum input signal: 1.85V RMS
Dynamic range measured at 10kHz in 2.4kHz band: 105 dB
Note: flat noise, not tested at higher sampling rate (will do it later)
M-audio Delta 44
Bus: PCI
Maximum sampling rate: 96kHz
Useable band: 44kHz (limited by antialiasing filter)
Maximum input signal: 4V RMS
Dynamic range measured at 10kHz in 2.4kHz band: 108 dB
Note: flat noise, input is not differential (negative input signal is
routed to ground via R-C)
E-MU 1616 (not a 1616M!)
Bus: CardBus (PCMCIA)
Maximum sampling rate: 192kHz
Useable band: 85kHz (limited by antialiasing filter and image rejection)
Maximum input signal: 2x 4V RMS, true differential input.
Dynamic range measured at 10kHz in 2.4kHz band: 122 dB
Note: noise increases sharply over 45kHz, up to a 60dB increase at
80kHz. Internal spurious signal at 46.5 kHz
The 1616 uses a PCM1804 converter, and the behaviour is described in
the converter data sheet. However it is very good at 96kHz sampling
rate, and Fin up to 45 kHz.
73 - Marco IK1ODO
[Non-text portions of this message have been removed]
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