10 Aug
2009
10 Aug
'09
9:27 p.m.
On Tue, Aug 11, 2009 at 09:18:59AM +1000, James Cameron wrote:
I've been asked to look into making an autonomous
sermon recording
device that will be attached to a monitor output of a front of house
public address system.
I'm probably going to write it in Python with either a gstreamer or ALSA
interface ... but getting to my question ...
... is anyone aware of an automatic input gain control filter that can
be applied, that will change the capture levels on the card, to ensure
that peaking is avoided yet a reasonable amount of signal is captured?
With a decent audio card you should be able to set the HW gain
so that there's no overload ever, and do the rest of the processing
on the digital signal. Many cards have stepped mixer gains anyway,
making it more or less impossible to use the mixer settings for auto
gain control.
For the processing a slowly acting compressor should do the trick.
Best would be one with a 'hold' function, to prevent it raising
the gain if there is a longer pause.
Ciao,
--
FA
Io lo dico sempre: l'Italia รจ troppo stretta e lunga.