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PROPOSED RESEARCH 
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We will  now  turn to  our proposed  research, and  begin by  briefly
discussing the necessary extension of the range of timbres covered by
the additive synthesis technique.  The eventual development  of truly
general  techniques  are  contingent  upon this  extension  of  cases
examined.  We next describe our plans for a systematic exploration of
data reduction  techniques,   which include the  rigorous testing  of
particular  methods  by  perceptual  scaling  experiments.   We  then
discuss a practical result from this exploration: the development  of
automatic data reduction algorithms. Reduced  data structures for the
physical attributes of music instrument tones provides the researcher
with a better tool to investigate the more general aspects  of timbre
perception for whole sets of  natural sources. This will be amplified
in a  latter section, devoted to the applications of multidimensional
scaling techniques to  timbre perception.   We will here discuss  the
higher-order  algorithms which should  result for  additive synthesis
from the above research, algorithms which give the user  perceptually
meaningful controls and which make optimal  use of computer resources
for the simulation of tones.
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extension of timbral range
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A  necessary step  for  the  eventual  development of  truly  general
simulation  techniques  is  the  application  of  our methods  to  an
extended set  of sources.   For  this purpose,   we  are planning  to
gather a  large collection of  tones from string, woodwind  and brass
families of  musical instruments.  Notes at several durations, played
in different manners, will  be recorded throughout the ranges  of all
instruments  in the above  families.   As our research  progresses in
time,  we  will cover a  broader base  of signals.   We will  thereby
investigate the  perception of  a very  diverse set  of cases and  be
guided to a more  general system for simulation.  In that the goal of
our endeavors is to develop a technique by which we can realistically
simulate any instrumental sound,  having any specific characteristics
in  any  context  that  could  occur  in  reality,    our  data  base
necessarily will be extensive.  The widening of this  data base is an
important part of our future research, and an integral feature of all
phases of investigation that are presented below.
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