Hi,

Thanks for the ultraquick response.


For performing conventional audio technical tests of soundcards, little
beats the freeware "Audio Rightmark" program.

I had a play with Audio Rightmark. I ran the tests with an optical loopback
connection, and the drivers configured for bit perfect recording (proven by
recording and playing back AC3 audio). I get slightly varying results each
time I run the test, so I suspect some resampling is occuring in the chain
on the output side. It'd be nice if RMAA had a function to 'lie' to the
operating system, pretending that the audio it was outputing was non PCM, so
as to prevent any resampling (Much the same way as software DVD players do
with AC3 or DTS sound).

I supose my original question still stands; Can you recommend a way to
accurately measure the BER between the output from the software, and
recording, for preference with realtime reporting?


Many thanks,

Chris Key





Below are the results obtained by RMAA, two using MME, and two with Direct
Sound. Both had the normamisation option disabled.

Frequency response (from 40 Hz to 15 kHz), dB: +0.00, -0.00
+0.00, -0.00 +0.00, -0.00 +0.00, -0.00
Noise level, dB (A): -86.4 -85.4 -87.1 -85.3
Dynamic range, dB (A): 86.1 89.6 84.4 86.4
THD, %: 0.0013 0.0010 0.0010 0.0008
IMD, %: 0.0088 0.011 0.013 0.0091
Stereo crosstalk, dB: -87.3 -86.3 -87.1 -87.1