User manual

8X96 ADC and DAC User Manual Page 13 of 54
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effective. A noise shaped 20 bit, 96k signal sounds virtually as good as 24 bit, 96k. Thus
using a 20 bit ADAT for 4 channel 20 bit, 96k recording (see S/MUX) can be very
effective.
The noise-shaping filters are automatically engaged at appropriate levels when either 16
or 20 bit output wordlenght is selected. If 24 bit output is selected, the noise-shaping
filter is off. There is an option to defeat the noise shaping and replace it with flat dither
accessible via a DIP switch inside the unit. (see “Special DIP switch options”)
More information about use of noise shaping in high resolution recording can be found in
the following Audio Engineering Society Preprints ( http://www.aes.org ):
“Coding Methods for High Resolution Recording Systems”
Preprint Number: 4639 Convention: 103 1997-09
Author: J. Robert Stuart
This paper reviews the recording and reproduction chain from the viewpoints of digital
audio engineering and psychoacoustics. It also attempts to define the audio requirements
of a transparent digital audio channel. The theory and practice of selecting high sample
rates such as 96kHz and word lengths of up to 24 bits are examined. The relative
importance of sampling rate and word size at various points in the recording, mastering,
transmission, and replay chain is discussed.
“Dynamic Range Enhancement Using Noise-Shaped Dither at 44.1, 48, and 96 kHz”
Preprint Number: 4236 Convention: 100 1996-05
Author: J. R. Stuart
Author: R. J. Wilson
This paper presents an overview of the work done on noise shaping, summarizing how
noise shapers are designed, implemented and measured, and outlining the hearing model
used to evaluate the various designs achieved.
“Dynamic Range Enhancement Using Noise-Shaped Dither Applied to Signals with and
without Preemphasis”
Preprint Number: 3871 Convention: 96 1994-03
Author: Robert Stuart
Author: Rhonda J. Wilson
This paper presents new noise-shaped dithers designed to give increased subjective
dynamic range when applied to signals with and without pre-emphasis.