Wadia Technical Bulletin, March 2001: Up-sampling and Wadia Technology
Digital up-sampling has been getting a lot of attention recently, and
for good reason: up-sampling can provide tremendous sonic benefit. At Wadia we have been
incorporating patented, high-performance synchronous up-sampling systems into our CD
Players and Decoding Computers since 1988. We welcome the new attention being paid to
up-sampling and would like to explain the technology behind it.
What is up-sampling?
Up-sampling is the process of mathematically generating digital
samples to “fill in the blanks” in a digital data stream. Up-sampling increases
the digital data rate, reducing the demands on the analog filters used to smooth the
signal during digital to analog conversion. Well-executed up-sampling can have a dramatic
sonic benefit, resulting in a more realistic and natural musical presentation. However,
up-sampling cannot somehow magically recover information not captured in the original
recording.
Can up-sampling convert a CD into 96 kHz?
Some products use asynchronous interpolation to increase the data
rate from a CD to 96 kHz or 192 kHz. While this process does increase the number of
samples, it does not recover any additional information that would have been captured
during a true 96/192 kHz recording. In fact, asynchronous interpolation discards the
original CD data and can actually reduce the clarity and detail of the original recording.
Why is Wadia’s DigiMaster up-sampling better?
Wadia’s patented DigiMaster system, by contrast, uses a
synchronous interpolation process to preserve the entire original signal and provide up to
2.8 MHz data rate – almost 30 times the data rate of 96 kHz up-sampling systems!
The DigiMaster system uses 12th-order polynomial Spline curve fitting to generate
up to 63 new samples for each original sample. Music lovers and audio reviewers around the
world have agreed that Wadia’s innovative up-sampling process realizes the most
compelling and engaging musical performance available.
What is the future of up-sampling?
Wadia has continued to refine and improve the DigiMaster system for
over 12 years, expanding the possibilities for high-performance digital audio decoding. We
firmly believe that consumers who desire the most advanced up-sampling technology in the
world need look no further than Wadia.
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