User manual

8X96 ADC and DAC User Manual Page 12 of 54
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8X96 ADC – Features
Mytek “SuperShaper-HR” ™ Noise Shaping & Dither
The 8X96 A/D converter employs SuperShaper-HR ™ - a sophisticated
psychoacoustically optimized noise shaping and dithering algorithm. SuperShaper-HR ™
uses 9
th
order high resolution noise shaping filters with proprietary filter coefficients
developed by Mytek Inc. The appropriate noiseshaping curve is programmed into
noiseshaping filters for each selected sampling frequency. This feature allows for
preserving 24 bit performance in 16 and 20 bit data output. The noiseshaping is
automatically engaged whenever 16 or 20 bit wordlength is selected and is active only
when analog input is selected. If digital input is selected the input data is cloned without
any processing.
Noise shaper performance graphs at 16 bit output.
Note the increased benefit of noiseshaping at hi-speed where 22 bit performance can be
achieved using 16 bit/96kHz storage.
When noise-shaping processing is on, the quantization noise is removed from the audio
band, where the noise floor is kept as close as possible to the 24 bit level, and moved to
the 20-22 kHz range (for FS=44 or 48k) or to 30-44kHz range (for high sampling rates).
Noise shaping is especially beneficial at higher sampling rates. At 88.2 or 96kHz the
noise is moved far beyond the audio band. As a result, the noiseshaping is much more