Add dynamic range compression support for analog channels.

(closes issue AST-29)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@224637 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 12 insertions, 0 deletions

diff --git a/configs/chan_dahdi.conf.sample b/configs/chan_dahdi.conf.sample
index 4ab2a5561..93848827d 100644
--- a/configs/chan_dahdi.conf.sample
+++ b/configs/chan_dahdi.conf.sample
@@ -577,16 +577,28 @@ echocancelwhenbridged=yes
 ;                increases the volume level on a channel, and a
 ;                negavive value decreases volume level.
 ;
+; Dynamic Range Compression: you can also enable dynamic range compression
+;                on a channel. This will amplify quiet sounds while leaving
+;                louder sounds untouched. This is useful in situations where
+;                a linear gain setting would cause clipping. Acceptable values
+;                are in the range of 0.0 to around 6.0 with higher values
+;                causing more compression to be done.
+;
 ;                There are several independent gain settings:
 ;   rxgain: gain for the rx (receive - into Asterisk) channel. Default: 0.0
 ;   txgain: gain for the tx (transmit - out of Asterisk Asterisk) channel.
 ;           Default: 0.0
 ;   cid_rxgain: set the gain just for the caller ID sounds Asterisk
 ;               emits. Default: 5.0 .
+;   rxdrc: dynamic range compression for the rx channel. Default: 0.0
+;   txdrc: dynamic range compression for the tx channel. Default: 0.0
 
 ;rxgain=2.0
 ;txgain=3.0
 ;
+;rxdrc=1.0
+;txdrc=4.0
+;
 ; Logical groups can be assigned to allow outgoing roll-over.  Groups range
 ; from 0 to 63, and multiple groups can be specified. By default the
 ; channel is not a member of any group.