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Speech intelligibility was measured for sentences presented in spectrally matched steady noise, single-talker interference, or speech-modulated noise. The stimuli were unfiltered or were low-pass (LP) (1200 Hz cutoff) or high-pass (HP) (1500 Hz cutoff) filtered. The cutoff frequencies were selected to produce equal performance in both LP and HP conditions(More)
Auditory filter bandwidths were measured using nonsimultaneous masking, as a function of signal level between 10 and 35 dB SL for signal frequencies of 1, 2, 4, and 6 kHz. The brief sinusoidal signal was presented in a temporal gap within a spectrally notched noise. Two groups of normal-hearing subjects were tested, one using a fixed masker level and(More)
Cochlear implants currently fail to convey phase information, which is important for perceiving music, tonal languages, and for hearing in noisy environments. We propose a bio-inspired asynchronous interleaved sampling (AIS) algorithm that encodes both envelope and phase information, in a manner that may be suitable for delivery to cochlear implant users.(More)
This study tested a time-domain spectral enhancement algorithm that was recently proposed by Turicchia and Sarpeshkar [IEEE Trans. Speech Audio Proc. 13, 243-253 (2005)]. The algorithm uses a filter bank, with each filter channel comprising broadly tuned amplitude compression, followed by more narrowly tuned expansion (companding). Normal-hearing listeners(More)
Auditory compression was estimated at 250 and 4000 Hz by using the additivity of forward masking technique, which measures the effects on signal threshold of combining two temporally nonoverlapping forward maskers. The increase in threshold in the combined-masker condition compared to the individual-masker conditions can be used to estimate compression. The(More)
A. Auditory filter shapes at low frequencies We recently established two important findings on frequency tuning in the human inner ear. First, tuning was sharper than previously thought, and sharpened considerably with increasing frequency from 1000 to 8000 Hz; second, human tuning was sharper by a factor of two than that found in other mammals that are(More)
A. Relating speech perception to psychoacoustic measures of cochlear integrity It has often been difficult to find good predictors of speech reception in measures of psychoacoustic performance. In some ways, given the complexity of speech, this is not surprising. On the other hand, there are some aspects of hearing loss, such as the loss of frequency(More)
A. Estimating cochlear status via phase effects in masking The threshold of a sinusoidal signal embedded in a complex-tone masker can depend dramatically on the phase relationships of the masker components. In an earlier study we showed that peripheral compression in a model was necessary to produce the large effects of masker phase found empirically(More)
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