Trubit™ Upsampling Operation; Pcm To Dsd Conversion And Upsample Rate Converter Function - Cary Audio Design SI-300.2d Owner's Manual

TruBit™ UPSAMPLING OPERATION

PCM TO DSD CONVERSION AND UPSAMPLE RATE CONVERTER FUNCTION

TruBit™ PCM & DSD Upsampling is a powerful upsampling technology used to upsample lower
sample rates to higher sample rate and increases the bit depth to 32 bits in the digital domain via a
dedicated 128 bit DSP engine prior to analog conversion. This can be very useful in achieving a
more enjoyable listening experience. Once a native input signal is changed to a selected higher
sample rate, the bit depth will also automatically increase to 32 bits for PCM signals and 1 bit for
DSD signals. This also allow for conversion of PCM signals to DSD, or lower DSD rates to higher
DSD rates. However, like all-powerful tools, this too should be used prudently. We do not take a
blanket "higher is better" approach to upsampling. It is important to experiment with different rates
depending on your source or source material. Many times a native rate might be preferred whereas
some recordings or files formats might benefit from a higher sampling rate, and so on.
The available selectable sample rates depend on the input signals original sample rate. For
example, above 192 kHz the available rate(s) will only be in multiples of either 44.1 kHz or 48 kHz
as follows:
Input signal rates of 44.1 or multiples of:
BYPASS (44.1) ---> 48 ---> 88.2 ---> 96--> 176.4 ---> 192 ---> 352.8---> 705.6
---> DSD64 ---> DSD128 ---> DSD256
Input signal rates of 48 or multiples of:
BYPASS (44.1) ---> 48 ---> 88.2 ---> 96--> 176.4 ---> 192 ---> 384--->768
---> DSD64 ---> DSD128 ---> DSD256.
Pressing the " Sample Rate Converter" button on the front panel, or the " SRC " button on the
hand held remote will cycle through the available sample rates.
• The BYPASS mode will pass the input signal rate out in its native rate without any
upsampling.
• When an upsample rate is selected, the SI-300.2d will upsample all incoming rates
lower than the selected sample rate up to the selected sample rate as well as increase the
bit depth to 32 bits. Any signals played that are equal to or higher than the selected sample
rate will playback unchanged. Each of the SI-300.2d inputs will remember the sample rate
as set for that input.
NOTE: TruBit™ Upsampling Sample Rate Converter does NOT engage for the USB source. Since
USB playback is dependent on media player software of the PC or MAC, you must select any desired
upsampling within the chosen media player software itself.
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