This contribution presents four algorithms developed by the authors for single-channel fullband and subband T60 estimation within the ACE challenge. The blind estimation of the fullband reverberation time (RT) by maximum-likelihood (ML) estimation based on [15] is considered as baseline approach. An improvement of this algorithm is devised where an energy-weighted averaging of the upper subband...

Because speech recognition performance is significantly lower at the age of nine or younger, acoustic standards classrooms for young children should be investigated. This study derives appropriate reverberation time lower-grade elementary school in Korea. A virtual sound field was created by computer modeling using normalized Korean schools. total five with times from 0.6 s to 1.2 were produced...

Byzantine chants constitute a form of monophonic vocal music characterized by lengthy phrases and by musical scales with intervals smaller than the western music semitones. Byzantine churches have extremely long Reverberation Time and their acoustics is dominated by the contributions of the diffuse sound field. Thus, the sound character of Byzantine chanting is closely linked to the acoustic re...

This research investigated the identification ability of English voiceless fricatives by Japanese listeners with high and low English proficiency. A perceptual experiment was carried out in five listening environments: RT (Reverberation Time) = 0.78 s, 1.12 s, 1.43 s, RT = 0.78 s + background noise at SNR (Signal-to-Noise ratio) = 10 dB, and quiet. Correct identification rates were calculated a...

Features derived from an auditory spectro-temporal representation of speech are proposed for robust far-field speaker identification. The auditory representation is obtained by first filtering the speech signal with a gammatone filterbank. A modulation filterbank is then applied to the temporal envelope of each gammatone filter output. Compared to commonly used mel-frequency cepstral coefficien...

Speech signals recorded with a distant microphone usually contain reverberation, which degrades the fidelity and intelligibility of speech in devices such as ’hands–free’ conference telephones, automatic speech recognition and hearing aids. One important effect of reverberation on speech is overlap–masking, i.e. the energy of the previous phonemes is smeared over time, and overlaps following ph...

Some hearing-impaired persons with hearing aids complain of listening difficulty under reverberation. No method, however, is currently available for hearing aid fitting that permits evaluation of hearing difficulty caused by reverberations. In this study, we produced speech materials with a reverberation time of 2.02 s that mimicked a reverberant environment (a classroom). Speech materials with...

Speech perception runs smoothly and automatically when there is silence in the background, but when the speech signal is degraded by background noise or by reverberation, effortful cognitive processing is needed to compensate for the signal distortion. Previous research has typically investigated the effects of signal-to-noise ratio (SNR) and reverberation time in isolation, whilst few have loo...

A major problem in moving platform active sonar systems is the detection of targets in spatially distributed and Doppler-spread reverberation. This paper presents a novel space time adaptive prewhitener for reverberation based on a two-dimensional autoregressive model. The space time adaptive prewhitener jointly processes received data in angle and Doppler to improve the separation of a target ...