Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 (Tek) 9/26/83; site vice.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!hao!hplabs!tektronix!tekchips!vice!shauns From: shauns@vice.UUCP (Shaun Simpkins) Newsgroups: net.audio Subject: Re: Sheffield CDs and why they sound bad Message-ID: <49@vice.UUCP> Date: Mon, 15-Oct-84 13:21:31 EDT Article-I.D.: vice.49 Posted: Mon Oct 15 13:21:31 1984 Date-Received: Sat, 20-Oct-84 07:07:50 EDT References: <46@vice.UUCP> <1183@hou4b.UUCP> Organization: Tektronix, Beaverton OR Lines: 18 If I remember my dbx specs right the vca has an attack time of less than a millisecond and a much longer decay time. They give some reasons relating to audibility of the gain riding for these times and suggest mightily that they are black magic. Who am I to argue? Anyway, this implies a control track bandwidth of at least 1KHz, perhaps 2 or 3KHz. Roughly speaking, every tenth word will be a control word if the control track is interleaved with the normal CD data stream. So, perhaps 10% play time reduction, not 30-50%. 100Hz compansion contoller BW sounds way too slow \- in particular for isolated percussive sounds, the bane of compression systems. The wandering squash, -- Shaun Simpkins uucp: {ucbvax,decvax,chico,pur-ee,cbosg,ihnss}!teklabs!tekcad!vice!shauns CSnet: shauns@tek ARPAnet:shauns.tek@rand-relay