Date: Wed, 25 Apr 2018 12:12:49 +0100 From: Steve O'Hara-Smith <steve@sohara.org> 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>
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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 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 <steve@sohara.org>
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