Research of Low Bit-Rate Speech Coding Technology
Date Issued
1998-07-31
Date
1998-07-31
Author(s)
DOI
872213E002019
Abstract
This paper presents a new forward masking
model for perceptual audio coding. This
model exploits adaptation of the peripheral
sensory and neural elements in the auditory
system, which is often deemed as the cause
of forward masking. Nonlinearity of the ear
is modeled by a nonlinear analog circuit with
difference equations. We incorporate this
model in the MPEG Layer III audio coding
scheme and construct a masking plane in
the frequency-time space. With some extra
computations, the new audio coding scheme
can improve the sound quality of the
decoded audio signals. In our experiments,
subjective and objective sound quality
measurements show that, to achieve the
same reconstructed sound quality, the new
scheme requires 12% to 23% less bits than
the original MPEG Layer III scheme.
Subjects
audiocoding
masking effect
sound quality measure
Publisher
臺北市：國立臺灣大學電機工程學系暨研究所
Type
report
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