Hi James,
We had the same problem. I is an hardware problem, du to the Neponset design. We succeeded in reducing the noise level by modifying the Neponset power supplied to the UDA1341 (3.3V) and the mike pre-amp (5V) section. The Assabet design gave the UDA1341 CODEC its own 3.3V regulator but no pre-amp while the Neponset CODEC takes it power of the board power supply. And that power is very dirty. So we have install a 3.3V regulator to service the CODEC only and bypass the pre-amp section to hook directly, the CODEC entries, like on Assabet. The noise level was reduce considerably. As for the mixer, we've made a small app to be able to change the setting.
Hope that help
Claude Lemelin
-----Original Message-----
From: James Esteves [mailto:[EMAIL PROTECTED]]
Sent: 26 juin, 2001 20:57
To: [EMAIL PROTECTED]
Subject: Neponset Noisy Recording
I'm trying to record .wav files using sox via Neponset board but I'm
getting alot of this thumbing/hissing background...Is there a solution
workaround for this? Also, is there a linux utility to change the mixer
settings? Thanks in advance.
I'm running 2.4.3-rk2-np1
James Esteves
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