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2014 ; 61
(7
): 2081-91
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Speech enhancement for listeners with hearing loss based on a model for vowel
coding in the auditory midbrain
#MMPMID24686228
Rao A
; Carney LH
IEEE Trans Biomed Eng
2014[Jul]; 61
(7
): 2081-91
PMID24686228
show ga
A novel signal-processing strategy is proposed to enhance speech for listeners
with hearing loss. The strategy focuses on improving vowel perception based on a
recent hypothesis for vowel coding in the auditory system. Traditionally, studies
of neural vowel encoding have focused on the representation of formants (peaks in
vowel spectra) in the discharge patterns of the population of auditory-nerve (AN)
fibers. A recent hypothesis focuses instead on vowel encoding in the auditory
midbrain, and suggests a robust representation of formants. AN fiber discharge
rates are characterized by pitch-related fluctuations having frequency-dependent
modulation depths. Fibers tuned to frequencies near formants exhibit weaker
pitch-related fluctuations than those tuned to frequencies between formants. Many
auditory midbrain neurons show tuning to amplitude modulation frequency in
addition to audio frequency. According to the auditory midbrain vowel encoding
hypothesis, the response map of a population of midbrain neurons tuned to
modulations near voice pitch exhibits minima near formant frequencies, due to the
lack of strong pitch-related fluctuations at their inputs. This representation is
robust over the range of noise conditions in which speech intelligibility is also
robust for normal-hearing listeners. Based on this hypothesis, a
vowel-enhancement strategy has been proposed that aims to restore vowel encoding
at the level of the auditory midbrain. The signal processing consists of pitch
tracking, formant tracking, and formant enhancement. The novel formant-tracking
method proposed here estimates the first two formant frequencies by modeling
characteristics of the auditory periphery, such as saturated discharge rates of
AN fibers and modulation tuning properties of auditory midbrain neurons. The
formant enhancement stage aims to restore the representation of formants at the
level of the midbrain by increasing the dominance of a single harmonic near each
formant and saturating that frequency channel. A MATLAB implementation of the
system with low computational complexity was developed. Objective tests of the
formant-tracking subsystem on vowels suggest that the method generalizes well
over a wide range of speakers and vowels.