8 Apr
2010
8 Apr
'10
1:38 a.m.
2010/4/7 Nicolo' Chieffo nicolo.chieffo@gmail.com
This is what I'm doing:
- got a jack-jack audio cable
- connected the headphone to the mic
- open alsamixer and put everything to 0 dB
- verified that the pass-throw works by using the sound recorder
./dbmeasure plughw:0 dbmeasure_hw.log
exits with this error:
Have you ask the author of "dbmeasure" ?
Iteration 1, level is 0 (-inf dB). Volume level measured (0) was too high or too low. Please adjust mixer so that initial level is between 0.8 and 0.97. Test run canceled.
I've also tried to put the mic level at 100% (22.50 dB) but the output is the same.
your card seem to support 16/20/24bits
if you right shift your 16/24 bits digital audio by 16/24 bits , the digital data are always zero so any software atten on a 16/24bits sound card is still a finite negative number dB instead of -inf dB
that 's why the professional user prefer 32bits sound card