From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tim Subject: Re: ice1712 IPGA and ADC controls Date: Tue, 30 Jan 2007 06:18:38 +0000 (UTC) Message-ID: References: <200701262325.33755.gineera@aspect135.co.uk> <20070127123807.GA2662@localhost.localdomain> <200701282259.52583.gineera@aspect135.co.uk> <20070129191551.GA2673@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@lists.sourceforge.net Errors-To: alsa-devel-bounces@lists.sourceforge.net To: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org John Rigg sound-man.co.uk> writes: > If a single volume bar is implemented, does it leave the analog > attenuation at zero and adjust the digital attenuation, or does > it leave the digital attenuation at zero and adjust the analog > attenuation? There is no such thing as analog attenuation on these chips. Only an analog gain stage from 0db to +18, followed by a digital attenuation stage from 0db down to infinity (mute). Both of these functions are accessed through the same register, as a continous range from 0 to 164. The first 127 steps 'activate' the digital attenuator, with 127 being 0db, while the last 37 steps 'activate' the analog gain. In other words, from 0-127 ONLY the digital attenuation stage is activated. From 128 to 164, ONLY the analog gain stage is activated. It was intended to be one control. Anyways, I say we add some type of 'decorations' to envy24control. Some type of markings. Two end-to-end 'braces' along the side spanning the length of sliders, one labeled "digital att." meaning that the range from 0-127 is digital attenuation, and the other labeled "analog gain" meaning the range 127-164 is analog gain. It would be a great visual reminder of this underlying technical detail we have discussed here, so everyone should understand it. And of course all values in db's as well as integers. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV