From: Craig H. <cr...@gu...> - 2006-07-04 02:29:03
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On Jul 3, 2006, at 6:32 PM, Darren Gibbs wrote: > BTW: Is this bit from the FAQ still true: I don't think so -- well, yes for 2.6.11 since it applies to non-ALSA OSS. > "Q: I believe the reason I am getting poor microphone recording > quality is that the +20 dB mic boost is not on and not accessible > using aumix (OSS). > > gumstix: That feature is accessible through aumix using the -i "input > gain" feature. -i 100 will turn on boost; -i 0 will turn it off. To > set the gain on MIC or LINEIN sources, use the MIC or LINEIN specific > gain options in aumix." > > aumix -i seems to allow variable gain between 0-100 iirc in OSS there were 2 "input gain" settings; something like "input gain" vs "microphone input volume" or something, and I made the generic one map to the ucb1400 generic gain register setting, and the mic one map to the ucb1400 "20dB boost" bit in whichever reg that's in. Something similar is probably possible in ALSA. C |