[CentOS] Re: recording sound: how 2 control recording level?
John R Pierce
pierce at hogranch.com
Sat Apr 28 17:34:14 UTC 2007
> Maybe it is your soundcard. Not all soundcards work 100% with linux. and I
> think you would have to have DMA working with it to get good recordings.
> Playing directly and recording to storage take different amounts of processor
> time. Also, are you recording to a line in port on the card or a mic port.
> Line in and mic ports have different attenuation and might need a matching
> transformer or some other sort of level control. That is why higher end cards
> have both a mic and line in port.
>
feeding a Line Out to a Mic In just needs attentuator resistors, not a
matching transformer. you can buy a mini-stereo-phone to
mini-stereo-phone patch cable with these attenuators built in, designed
to allow you to feed the line out from a CD player into a walkman style
tape deck's mic input. The usual attenuator is 100K ohms in series,
and 10k ohms in parallel . Note recording from a Mic Input will likely
be noisier.
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