Appeal No. 1999-1793
Application 08/161,798
C(p;m) is generated having a first value C(p;m)="1" for G(p;m)$T(p)
and a second value C(p;m)="0" for G(p;m)<T(p) (col. 11, lines 31-36).
The thresholds are related to the thresholds of the human auditory
system for perceiving single tones in the respective frequency ranges
(col. 11, lines 36-44); thus, the thresholds are "based on
psychoacoustic criteria." By these comparisons, the blocks (p;m) of
subband signals xp(k) are divided into blocks (p;m) containing
perceptually significant signal energy on the basis of the criterion
G(p;m)$T(p) and thus having the value C(p;m)="1", and blocks (p;m)
containing no perceptually significant energy on the basis of the
criterion G(p;m)<T(p) and thus having a value of C(p;m)="0" (col. 11,
lines 45-52). No quantizing bits are allocated to the blocks (p;m)
within the same allocation window having C(p;m)="0" and the
quantizing bits thus saved are used for the finer quantization of the
blocks (p;m) within the same allocation window having C(p;m)="1"
(col. 11, lines 52-57). This eliminates blocks (p;m) that are
irrelevant. The blocks (p;m) having the value C(p;m)="1" are
"available frequency-units" because they are available for bit
allocation. The comparator signal C(p;m), which determines whether a
block (p;m) is "available" is based on the threshold T(p) for the
subband, which is "based on psychoacoustic criteria"; thus, the
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