From owner-freebsd-questions@freebsd.org Wed Apr 25 12:13:12 2018 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 907AFFA4273 for ; Wed, 25 Apr 2018 12:13:12 +0000 (UTC) (envelope-from 4250.10.freebsd-questions=freebsd.org@email-od.com) Received: from bca5.email-od.com (bca5.email-od.com [207.246.239.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 14CF8775F4 for ; Wed, 25 Apr 2018 12:13:11 +0000 (UTC) (envelope-from 4250.10.freebsd-questions=freebsd.org@email-od.com) DKIM-Signature: v=1; a=rsa-sha256; d=email-od.com;i=@email-od.com;s=dkim; c=relaxed/relaxed; q=dns/txt; t=1524658393; x=1527250393; h=content-transfer-encoding:content-type:mime-version:references:in-reply-to:message-id:subject:to:from:date:x-thread-info; bh=asl/SplO+iD+0ix52z+6RvlJael85l0eR8DdQYaT/g8=; b=E4Xqs3aIdRmlIorethoojm3l+b9hTBJZKtwejwmx8ZfDQDNu6urIDtelpbpiX34lYs6idqfnyO9CodlUFnkGWWJVJWd371F36M2UfvWcX4N5jWasfo4j0tBieFqwIJtt3J7u/teezRcwn8chzD5CuYvqqBvu90/t79sIFFt+YjY= X-Thread-Info: NDI1MC4xMi45ODAwMDAwMDIxZmZjMy5mcmVlYnNkLXF1ZXN0aW9ucz1mcmVlYnNkLm9yZw== Received: from r3.h.in.socketlabs.com (r3.h.in.socketlabs.com [142.0.180.13]) by bca2.email-od.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Wed, 25 Apr 2018 07:12:53 -0400 Received: from smtp.lan.sohara.org (EMTPY [89.127.62.20]) by r3.h.in.socketlabs.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Wed, 25 Apr 2018 07:12:51 -0400 Received: from [192.168.63.1] (helo=steve.lan.sohara.org) by smtp.lan.sohara.org with smtp (Exim 4.90_1 (FreeBSD)) (envelope-from ) id 1fBILx-0007tp-PE for freebsd-questions@freebsd.org; Wed, 25 Apr 2018 11:12:49 +0000 Date: Wed, 25 Apr 2018 12:12:49 +0100 From: Steve O'Hara-Smith To: freebsd-questions@freebsd.org Subject: Re: audiophile sound on FreeBSD ? Message-Id: <20180425121249.3de329616ad9c07822e5e572@sohara.org> In-Reply-To: <20180425185330.70fb9b1e.freebsd.ed.lists@sumeritec.com> References: <20180423224242.7299f430@WorkMachine> <20180424113308.52f35f93@WorkMachine> <20180424200924.12c648bf@archlinux> <20180424235410.5e175bc6@gumby.homeunix.com> <20180425185330.70fb9b1e.freebsd.ed.lists@sumeritec.com> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.32; amd64-portbld-freebsd11.1) X-Clacks-Overhead: "GNU Terry Pratchett" Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Apr 2018 12:13:12 -0000 On Wed, 25 Apr 2018 18:53:30 +0800 Erich Dollansky wrote: > After noticing that he has an original LP of > a CD of mine, we plugged normal digital equipment in. Every child could > hear the difference. There are substantial differences between what is recorded on an LP and what is recorded on a CD even if they start from the same master tape. The audio for the LP will have been processed with RIAA (to be reversed by the pre-amp on playback) while the audio for the CD will have been filtered sharply to prevent aliasing. Then the audio for the LP will be mastered onto the LP with some care (possibly compression being applied) to ensure that the groove spacing is adequate to the amplitude being recorded while the audio for the CD will be digitised. The playback pitch accuracy will depend on the rotation speed of the turntable for the LP and for the readout speed of the CD mechanism for the CD (which may or may not be buffered to prevent mechanical jitter*). IOW they're bound to sound different - as to which is more accurate you'd need to do a double blind test against the monitors the mixing engineer used (at least I *think* that's the most valid reference). *: I recall reading many years ago that some recording engineers could tell which machine a digital recording was mastered on because of the characteristic timing jitter imposed by the machine onto the recording. -- Steve O'Hara-Smith