Return-Path: Received: (qmail 18376 invoked from network); 28 Dec 2000 01:06:34 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by extortion.plus.net with SMTP; 28 Dec 2000 01:06:34 -0000 Received: (qmail 13276 invoked from network); 28 Dec 2000 01:09:05 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 28 Dec 2000 01:09:05 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14BRPz-0007oI-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 28 Dec 2000 00:59:43 +0000 Received: from imo-r17.mx.aol.com ([152.163.225.71] helo=imo-r17.mail.aol.com) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14BRPx-0007o6-01 for rsgb_lf_group@blacksheep.org; Thu, 28 Dec 2000 00:59:42 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from MarkusVester@aol.com by imo-r17.mx.aol.com (mail_out_v28.35.) id l.e5.3e4ab7 (18255) for ; Wed, 27 Dec 2000 19:59:17 -0500 (EST) From: MarkusVester@aol.com Message-ID: Date: Wed, 27 Dec 2000 19:59:17 EST Subject: LF: Re: Off topic - Soundblaster AGC To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 8bit X-Mailer: AOL 4.0.i for Windows 95 sub 70 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hello Stewart, Andy, > ... I discovered that > the reason that I was not seeing the linear change with amplitude that > I was expecting was because there is some sort of vogad action > in the microphone audio input. Does anyone know: > > 1) How to turn this off > 2) If the same applies to the line input I'd be glad if I knew. Had exactly the same annoying problem, using a notebook with an ESS 1869 "audio drive" chip. Here, the AGC is active on all inputs, but only in the 8 bit mode. As it decays in visible discrete steps, I assume the audio is always sampled at full 16 bit depth, and the on-chip firmware tries to optimize the dynamic range when scaling down to 8 bits. My problem is that I don't know how to program the Windows interface, and from the DOS-box, I can only adress the chip in its 8 bit SoundBlaster compatible mode. I have even sent an email inquiry to ESS asking how to work around the AGC, but never got any response from them. 73 de Markus, DF6NM