From owner-freebsd-multimedia@FreeBSD.ORG Sun Jul 20 10:54:50 2014 Return-Path: Delivered-To: freebsd-multimedia@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 0D9966A3 for ; Sun, 20 Jul 2014 10:54:50 +0000 (UTC) Received: from mail-la0-x229.google.com (mail-la0-x229.google.com [IPv6:2a00:1450:4010:c03::229]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 7937F28C5 for ; Sun, 20 Jul 2014 10:54:49 +0000 (UTC) Received: by mail-la0-f41.google.com with SMTP id s18so4098252lam.28 for ; Sun, 20 Jul 2014 03:54:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=/SUVBtMgPI3UeR9R2/SF+VZKh8s7zHpa1vfQlI7OMRY=; b=hFDOWm8Qw+Lf31PglNehN+ibpqnCJdPU7pzGigAjyyURp7zKv8H47vthVYdlWui2Mz WVi4GRyabVy/GY4WRV6tHW3/i8BqxPr1qP6nU5gv9wT0R699WLvHSJ7Edk8wXRCNepB1 sjprRBaTX3jXWYczfakToQff4f+UbYeIxdK1s/ea72/WpLfh/grJC3fX8pgm+jz/hj3x 0GK5sJunTsU1oR9xCbPVzF0M7qf9BPJ2fA9hyd5ukixZZs+FpmIZA67/cUVH0iZNp8nx 1OHWYYyv9F8JyJkPeaRT/H81bTf4akJU/5wcnD/Al0dbFvlu77HnXrqxC8aYfZ5vBcG5 ULZg== MIME-Version: 1.0 X-Received: by 10.152.43.34 with SMTP id t2mr17808820lal.28.1405853687003; Sun, 20 Jul 2014 03:54:47 -0700 (PDT) Received: by 10.112.98.137 with HTTP; Sun, 20 Jul 2014 03:54:46 -0700 (PDT) In-Reply-To: References: <53CB913F.4060405@selasky.org> Date: Sun, 20 Jul 2014 12:54:46 +0200 Message-ID: Subject: Re: Making freebsd - pcbsd faster by changing the interrupt requests From: Hans Ruhe To: Hans Petter Selasky Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.18 Cc: freebsd-multimedia@freebsd.org X-BeenThere: freebsd-multimedia@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Multimedia discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 20 Jul 2014 10:54:50 -0000 Hello Hans Petter, This might be very usefull too: http://linuxaudio.org/members http://linuxaudio.org/about Best regards, Hans 2014-07-20 12:37 GMT+02:00 Hans Ruhe : > ps I am currently testing Logitech Picoplayer installed on a Raspberry PI > which will be part of the dac as it is happens to have an IS2 connection. > The DAC itself is already quite special as even Japanese hifi companies are > interested and flew to Germany where the Dutch developer is living. He is > working together with the tube designer and hifi journalist. > > http://www.dddac.com/ is his website. It is in English :-) > > Best regards, > Hans > > > > > > 2014-07-20 12:31 GMT+02:00 Hans Ruhe : > > Hello Hans Petter, >> >> I am playing stereo. Primarily 16 bits 96khz and 24 bits 192khz. But I >> have albums that are sometimes better recorded on 16 bits than some 24 bit >> albums. So it is not always the case that higher sample rates are the >> better ones. >> >> Anyway, what I can hear is a much tighter bass, mid frequencies are >> therefore coming out better and the higher frequencies are better to listen >> to. >> >> I hope this was helpfull. Perhaps a peak at the Ubuntu project gives a >> better view of this: http://ubuntustudio.org/ >> >> Best regards, >> Hans >> >> >> 2014-07-20 11:51 GMT+02:00 Hans Petter Selasky : >> >> On 07/20/14 11:09, Hans Ruhe wrote: >>> >>>> Hello everybody, >>>> >>>> I am testing for PCBSD primarily but I am also testing with a hifi >>>> journalist, tube amplifier designer. This is the website: >>>> http://www.audio-creative.nl/ >>>> >>>> Mind you it is mostly in Dutch but some parts are in English. They >>>> recently >>>> started to sell kits like a dac and a tube phono amplifier. >>>> Mind you this guy has a University degree in electronics and the firm he >>>> works for make parts for ASML which sells machines for Intel, Samsung >>>> etc >>>> to bake their processors. So it is a very high level of knowledge of >>>> electronics. >>>> >>>> Always looking for better sound, 2 months ago I came upon Ubuntu Studio, >>>> which projects uses real time latency and changing interrupt requests to >>>> make it faster and also to have those requests dealing with audio and >>>> movies a privilege above other ones. >>>> >>>> I am not that far that I exactly know what they do, but the fiddle in >>>> the >>>> kernel for that :-) >>>> Also I am not a developer ( i bought myself a Raspberry Pi to make the >>>> first steps though). >>>> >>>> This is only an idea, but would it be possible to do such a thing for >>>> freebsd and pcbsd as well ? >>>> >>>> I tested Ubuntu Studio with the use of Audacious and I could really >>>> hear a >>>> difference. I have a 3 way loudspeakersystem and a EL84 tube amplifier >>>> in >>>> Class A (yes it uses some more electricity but it really pays of >>>> enjoying >>>> music a lot more ;-) >>>> >>>> >>> Hi, >>> >>> Some hardware devices have effects, like treble, base, 3D stereo, and so >>> on, which might be configured differently. Can you tell us at what sample >>> rates you are able to hear differences? >>> >>> --HPS >>> >>> >> >