On Mon, 14 Mar 2005 20:49:03 +0200 Jussi Laako <[EMAIL PROTECTED]> wrote:
> Typical newsgroup FUD. The paper referenced is this one: http://sjeng.org/ftp/SACD.pdf by Lipshitz and Vanderkooy, two absolute *GIANTS* in the field of digital audio theory and practice. > First of all, most of current A/D and D/A converters are delta sigma > modulators. Yes, but from what I've heard, with modern delta-simga converters, the minimum bit width is 4 bits, not one bit. > If you record something at for example 24-bit 192 kHz (using > typical delta sigma converter), The A/D converters now use a minimum of 4 bits. > do some editing (in float format) Ie it gets convertered to PCM. > and > then output the master as PWM for SACD. They *may* be some advantage here in that you can pay for a very expensive PCM -> SACD converter at the mastering stage and the playback system becomes simpler. However, Sony is pushing SACD as a complete solution for the whole audio chain. Sony and others are working on SACD multi track recorders and so on. It is this in particular that Lipshitz and Vanderkooy and trying to address. Erik -- +-----------------------------------------------------------+ Erik de Castro Lopo [EMAIL PROTECTED] (Yes it's valid) +-----------------------------------------------------------+ "Linux is produced to be used, whereas the others are produced to be sold" -- Bobby D. Bryant