From: "Francisco J. Huerta" <[EMAIL PROTECTED]>
> Wrong. DVD-A is the 24-bit audio format. SACD is *NOT* a CD format by any
means; it can hold a lot more information than a standard CD, like a DVD.
The SACD signal is formed by a pulse train signal at 1 MHz.
Yeah...my bad. You'll have to forgive me for getting my numbers wrong. It's
getting hard to keep up. Francisco is right. SACD is an expansion of Sony's
Super Bit Mapping Technology and (as such) uses a 1 bit converter with an
EXTREMELY high sampling rate to achieve it's remarkably high resolution.
Here's the scoop from Sony's press release :
At the time the CD was developed, the PCM format was the best technology
available for recording. Nearly two decades later, huge strides in
professional recording capabilities have outgrown the limitations inherent
in PCM's 16-bit quantization and 44.1kHz sampling frequency. In fact,
transferring a top quality digital studio recording onto a CD in PCM format
actually reduces the audio quality, because of the dependence on decimation
digital filters and multi-bit quantization.
The DSD recording format used in Super Audio CD, on the other hand, uses a
2.8224MHz sampling frequency for the original I-bit data to allow direct
recording of a Super Audio CD master. Thanks to DSD's I-bit nature, the
pulse is exceptionally faithfull to the original because superfluous
quantization and decimation processes are eliminated. Also, on the playback
side, use of DSD eliminates the need for interpolation and steep
anti-aliasing filters traditionally used to block frequences above 20kHz, as
well. With the DSD format, frequency response is broadened to 100kHz with a
dynamic range of 120dB (audible frequency range). In short, DSD allows
direct recording of a very accurate pulse which can be easily played back
with exceptional results.
The DSD format used for Super Audio CD presents an excellent opportunity for
the music industry, allowing the production of exceptionally high- quality
audio masters for new titles and for preserving present analog archives.
Super Audio CD is the ideal media for recording and playback of high
fidelity pure audio.
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