Fw: [softrock40] Audio board tests

[Terry Fox]

----- Original Message ----- 
From: Marco IK1ODO 
To: softrock40 at yahoogroups.com ; Ciao_Radio_newsgroup_ at yahoogroups.com 
Sent: Monday, October 16, 2006 4:31 PM
Subject: [softrock40] Audio board tests


Hi all,

I performed some more tests on different audio boards. Here are my results:

M-audio Audiophile 192
Maximum sampling rate: 192kHz
Useable band: 85kHz (limited by antialiasing filter and image rejection)
Maximum input signal: 4V RMS
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
Maximum sampling rate: 96kHz
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, antialiasing filter is fixed at 24kHz, does not 
change with sampling rate

M-audio Delta 44
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

I'm waiting for delivery of an E-MU 1616. I will post test results 
for it as soon as possible.

73 - Marco IK1ODO



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