We are experiencing some problem with the sound (CODEC 1341) on Neponset. The problem is when recording the sound (using the onboard microphone on Neponset) we get a lot of background noise. We do not have this problem with the use of Assabet only (CODEC 1341). (I use the following command for testing: cat /dev/dsp > filename and cat filename > /dev/dsp) On Neponset we can play MP3 files and WAV files without background noise. So, something is wrong with either the input to the CODEC 1341 (hardware) or the CODEC 1341 setting (software). The problem can be found on our three Neponsets. The following is the setup of the CODEC 1341 (all the other setting is set to the default value as specified in the UDA1341 specification): DATA0_0.volume = 15; Volume Control of -14dB DATA0_2.mode = 3; Mode filter to maximum DATA0_ext2.mixer_mode = 2; Mixer mode to select input channel 2 DATA0_ext2.mic_level = 4; Microphone sensibility setting of +15dB DATA0_ext4.AGAC_ctrl = 1; AGC enable DATA0_ext6.AGC_level = 3; AGC output level setting to -17.5dB I tried many setting and the best solution that I have is with the Microphone sensibility setting of 0dB. With this setting, I reduced the background noise level by a factor of 2 but still some background noise. NOTE: In order to be able to configure the CODEC from software, we have unsoldered the jumper wire at J7, and move it to immediately adjacent J4. Does anyone have experiencing this problem. If no, what was your CODEC setting. If yes, what is your suggestion to eliminate those background noise. The kernel that I use for testing the sound is 2.4.1-rmk1-np2. <<...>> Sylvain Pérusse Software Engineer 225 boul. Du Séminaire Sud Email: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> Saint-Jean-sur-Richelieu Phone: (450) 542-5798 Québec Canada J3B 8E9 Fax: (450) 358-7704 _______________________________________________ http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm Please visit the above address for information on this list.
