From: Wolfgang Fritz <wolfgang.fritz@gmx.net>
To: linux-kernel@vger.kernel.org
Subject: Re: i4l dtmf errors
Date: Sat, 14 Dec 2002 21:51:10 +0100 [thread overview]
Message-ID: <atg5jv$d73$1@fritz38552.news.dfncis.de> (raw)
In-Reply-To: <200212121145.26108.roy@karlsbakk.net>
Roy Sigurd Karlsbakk wrote:
> hi
>
> it seems isdn4linux detects DTMF tones from normal speach. This is
> rather annoying when using i4l for voice with Asterisk.org. This is
> tested on all recent kernels
The DTMF detection is broken since kernel 2.0.x. I have a patch for a
2.2 kernel which may manually be applied 2.4 kernels with some manual
work. It fixes an overflow problem in the goertzel algorithm (which
does the basic tone detection) and changes the algorithm to detect the
DTMF pairs. If interested, I can try to recover that patch.
Wolfgang
>
> see thread "[MGCP] Asterisk/D-Link phones generates ugly DTMF
> tones!!!" at http://www.marko.net/asterisk/archives/ for more info.
>
> roy
next prev parent reply other threads:[~2002-12-14 20:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-12 10:45 Roy Sigurd Karlsbakk
2002-12-12 12:10 ` Matti Aarnio
2002-12-14 14:54 ` Roy Sigurd Karlsbakk
2002-12-14 20:51 ` Wolfgang Fritz [this message]
2002-12-14 23:14 ` Kai Germaschewski
2002-12-16 17:44 ` [PATCH] (Was: i4l dtmf errors) Wolfgang Fritz
2003-01-06 9:57 ` Roy Sigurd Karlsbakk
2002-12-16 11:07 ` i4l dtmf errors Roy Sigurd Karlsbakk
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