Date: Thu, 26 Apr 2018 01:56:17 +0800 From: Erich Dollansky <freebsd.ed.lists@sumeritec.com> To: Steve O'Hara-Smith <steve@sohara.org> Cc: freebsd-questions@freebsd.org Subject: Re: audiophile sound on FreeBSD ? Message-ID: <20180426015617.08c89a40.freebsd.ed.lists@sumeritec.com> In-Reply-To: <20180425121249.3de329616ad9c07822e5e572@sohara.org> References: <20180423224242.7299f430@WorkMachine> <20180424113308.52f35f93@WorkMachine> <20180424200924.12c648bf@archlinux> <20180424235410.5e175bc6@gumby.homeunix.com> <20180425185330.70fb9b1e.freebsd.ed.lists@sumeritec.com> <20180425121249.3de329616ad9c07822e5e572@sohara.org>
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Hi, On Wed, 25 Apr 2018 12:12:49 +0100 Steve O'Hara-Smith <steve@sohara.org> wrote: > On Wed, 25 Apr 2018 18:53:30 +0800 > Erich Dollansky <freebsd.ed.lists@sumeritec.com> 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 LP was even purchased before CDs were even invented. So, real old stuff with all the other noises a CD does not have. > > 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. > There is not doubt for me. Erich
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