Jinx <[EMAIL PROTECTED]> writes:
> Can somebody either send a link to what Type-r is or run it down quick for
> me? I think I lost that one, I haven't heard exactly what that does.
Sony never said much about it publicly. The following was translated from a
Japanese Sony brochure by a friend: http://www.minidisc.org/type_r_atrac.html
Sony's ATRAC with Type-R DSP
Translated from a Japanese Sony brochure that mentions the Type-R DSP for ATRAC
Adaptive High Band Control Technology Improves the Signal Processing Accuracy
With the MDS-JA33ES/JA22ES we have developed a new Type-R DSP that
has, at its core, two times more signal processing power than
before. In addition, a newly developed intelligent bit re-allocation
algorithm that fully utilizes this increased processing power has been
adopted. The algorithm re-analyzes the musical data and searches for
subtle, redundant bit allocations that up until now had been difficult
to find. The algorithm re-allocates these redundant bits
preferentially to psycho-acoustically important bands, essentially
refining the allocation of bits and improving the reproduction of the
source signal. Keeping the accuracy of each processing result is
essential for digital signal processing. In making the Type-R DSP for
ATRAC, each processing step was checked and very accurate processing
has been enabled. As a result, the reproduced sound has become
euphonious and quite close to the source sound.
Perhaps the "R" stands for recursion, or repetition. My guess is that
there is some step within the ATRAC encoder that they have chosen to
optimize with a successive approximation algorithm that was too
computationally expensive for prior chips.
Rick
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