Lake People DAC RS 06 User Manual - Resampling
15
RESAMPLING
is a mighty feature for the transformation/restoration of jittered signals
into high-quality signals. As well, the signal quality of 44.1 or 48 kHz
sources can be improved by converting them to a higher rate. This also
complies to the USB input which often suffers from jitter caused by
improper treated computer outputs. With the aid of resampling process
nearly all jitter (and not only specific ones) is removed from the USB
data stream without using
“asynchronous USB mode” which is
nonetheless also a feature of the USB input.
This isn't mystery at all, but a feature offered by so called sample-rate
converters - available since the nineties of the past century.
While early sample rate converters could provide conversion ratios of
1:2 to 2:1 at 100dB dynamic range only, ratios of 1:16 to 16:1 at 140 dB
dynamic range are feasible today.
In principle, the digital data stream is asynchronously disassembled by a
DSP specially developed for this purpose and can be recombined at
virtually any sample rate desired.
The quality of this recombination is directly dependent from the SRC´s
clock source. Therefore inside DAC RS 06 a special low jitter oscillator
with typical < 1 pS (Picosecond !) phase jitter is used.
The oscillator is powered by a low noise source made of discrete
components. By means of this process, all potential jitter vanishes
almost completely and - due to the higher sampling rate - the analog
filters after the converter stage can follow a much more straightforward
and "musical" design. Furthermore, all digital input signals will be
completed to 24 bit.