Search Results
Results 551 - 600 of 1455
< 7 8 9 10 11 12 13 14 15 16 17 >
Zhang Fawen - - 2011
A better understanding of the neural correlates of large variability in cochlear implant (CI) patients' speech performance may allow us to find solutions to further improve CI benefits. The present study examined the mismatch negativity (MMN) and the adaptation of the late auditory evoked potential (LAEP) in 10 CI users. ...
Chen Fei - - 2010
The normalized covariance measure (NCM) has been shown previously to predict reliably the intelligibility of noise-suppressed speech containing non-linear distortions. This study analyzes a simplified NCM measure that requires only a small number of bands (not necessarily contiguous) and uses simple binary (1 or 0) weighting functions. The rationale behind ...
Pastore Richard E - - 2010
Recent investigations of loudness change within stimuli have identified differences as a function of direction of change and power range (e.g., Canévet, Acustica, 62, 2136-2142, 1986; Neuhoff, Nature, 395, 123-124, 1998), with claims of differences between dynamic and static stimuli. Experiment 1 provides the needed direct empirical evaluation of loudness ...
Neves M J - - 2010
We obtain the κ-deformed versions of the retarded and advanced Green functions and show that their causality properties are blurred in a time interval of the order of a length parameter q=1/(2κ). The functions also indicate a smearing of the light cone. These results favor the interpretation of q as ...
Roberts Brian - - 2011
Noise-vocoded (NV) speech is often regarded as conveying phonetic information primarily through temporal-envelope cues rather than spectral cues. However, listeners may infer the formant frequencies in the vocal-tract output-a key source of phonetic detail-from across-band differences in amplitude when speech is processed through a small number of channels. The potential ...
Rosen Kristin M - - 2011
Spectral measures are sensitive to dysarthric speech. However, it is unclear whether the spectral differences in dysarthric and healthy speech are due to slow articulation rate or reflect other qualitative changes in speech. Spectral measures were used to detect differences between habitual, slow, and "clear" speaking modes in 12 healthy ...
Mendes Jason - - 2011
While many motion correction techniques for MRI have been proposed, their use is often limited by increased patient preparation, decreased patient comfort, additional scan time, or the use of specialized sequences not available on many commercial scanners. For this reason, we propose a simple self-navigating technique designed to detect motion ...
Britton J R - - 2010
Hatchery-reared and wild roach Rutilus rutilus were correctly classified to their rearing environment in a discriminant function using data on their scale circuli patterns. The discriminant function was then used to classify recaptured R. rutilus by their origin (hatchery-reared and wild) during a riverine stocking evaluation. At 8 and 18 ...
Remez Robert E - - 2010
Speech signal components that are desynchronized from the veridical temporal pattern lose intelligibility. In contrast, audiovisual presentations with large desynchrony in visible and audible speech streams are perceived without loss of integration. Under such conditions, the limit of desynchrony that permits audiovisual integration is also adaptable. A new project directly ...
Turgeon Katrine - - 2010
Functional connectivity, the degree to which the landscape facilitates or impedes movement, depends on how animals perceive costs and benefits associated with habitat features and integrate them into a movement path. There have been few studies on functional connectivity in marine organisms, despite its importance for the effectiveness of Marine ...
Madison Guy - - 2010
There is an apparent contradiction between the narrow range of tempi optimal for perceptual judgment and motor synchronization and the wide range of beat tempi found in real music. The relation between listeners' perception of speed and beat tempo was therefore investigated, both for real music excerpts (ME) and metronome ...
Sagers Jason D - - 2010
Low-frequency sound transmission through passive lightweight partitions often renders them ineffective as means of sound isolation. As a result, researchers have investigated actively controlled lightweight partitions in an effort to remedy this problem. One promising approach involves active segmented partitions (ASPs), in which partitions are segmented into several distinctly controlled ...
Wissner-Gross A D - - 2010
Recent advances in high-frequency financial trading have made light propagation delays between geographically separated exchanges relevant. Here we show that there exist optimal locations from which to coordinate the statistical arbitrage of pairs of spacelike separated securities, and calculate a representative map of such locations on Earth. Furthermore, trading local ...
Brunner Jana - - 2011
The aim of this study was to relate speakers' auditory acuity for the sibilant contrast, their use of motor equivalent trading relationships in producing the sibilant /∫/, and their produced acoustic distance between the sibilants /s/ and /∫/. Specifically, the study tested the hypotheses that during adaptation to a perturbation ...
McDonnell Maria - - 2011
Singers learn to produce well-controlled tone onsets by accurate synchronization of glottal adduction and buildup of subglottal pressure. Spectrographic analyses have shown that the higher spectrum partials are present also at the vowel onset in classically trained singers' performances. Such partials are produced by a sharp discontinuity in the waveform ...
Tjaden Kris - - 2011
This study examined the extent to which articulatory rate reduction and increased loudness were associated with adjustments in utterance-level measures of fundamental frequency (F(0)) variability for speakers with dysarthria and healthy controls that have been shown to impact on intelligibility in previously published studies. More generally, the current study sought ...
Radish Kumar B - - 2011
Spectrum is a fast Fourier transform-generated power spectrum extracted from the speech sample. It is reported to provide a quantitative acoustic index of the degree of glottal abduction and adduction in voices perceived to be breathy or pressed. In the present study, it was hypothesized that there would be abnormal ...
Sims Michelle - - 2010
This study investigates how the duration of the stem vowel of regular and irregular English verbs is modulated by tense (present and past), regularity, lexical frequency, gang size of the vocalic alternation, imageability ratings, and vowel quality. The vocalic durations of 48 monosyllabic irregular verbs and 171 regular verbs were ...
Disner Sandra Ferrari - - 2010
The reassigned spectrogram, an enhanced time-frequency display that has been proposed as a means of focusing in on the details of the phonation process [S. A. Fulop and S. F. Disner, "Advanced time-frequency displays applied to forensic speaker identification," J. Acoust. Soc. Am. 125, 2530 (2009)] was used to examine ...
Fox Robert Allen - - 2010
This study considers an operation of an auditory spectral integration process which may be involved in perceiving dynamic time-varying changes in speech found in diphthongs and glide-type transitions. Does the auditory system need explicit vowel formants to track the dynamic changes over time? Listeners classified diphthongs on the basis of ...
Kreiman Jody J Division of Head and Neck Surgery, School of Medicine, University of California, Los Angeles, 31-24 Rehab Center, Los Angeles, California 90095-1794, USA. - - 2010
Little is known about the perceptual importance of changes in the shape of the source spectrum, although many measures have been proposed and correlations with different vocal qualities (breathiness, roughness, nasality, strain...) have frequently been reported. This study investigated just-noticeable differences in the relative amplitudes of the first two harmonics ...
Chen Yang - - 2010
Locus equation (LE) was designed to examine the spectral changes during coarticulated consonant-vowel (CV) utterances through obtaining a regression straight-line which fits to points on a 2-D Cartesian coordinate system, with the ordinate and abscissa corresponding to onset F2 and target (mid-vowel) F2, respectively [Lindblom (1963); Sussman et al. (1992)]. ...
Benders Titia - - 2010
The categorization of speech sounds is influenced by the preceding sound context. Specifically, listeners shift their boundary between two categories toward the values of the preceding sounds. Such boundary shifts are larger if listeners can respond with fewer categories than are actually present in the stimuli. This study investigates the ...
Kirchhuebel Christin - - 2010
This study analyzes the effects of Lombard speech on vowel formant frequencies. Ten male native German speakers were selected from the "Pool 2010" corpus, which was recorded at the Bundeskriminalamt, Germany. Spontaneous speech produced in a neutral setting and Lombard setting, where 80 dB of noise was played through headphones, ...
Menezes Caroline - - 2010
Stuttered speech is characterized by the presence of speech blocks. Little is known on what causes blocks. These blocks typically occur on onset segments of a syllable regardless of the number of syllables in the stuttered word. Blocks on voiced and voiceless stops often result in part word repetitions (e.g., ...
Mendelsohn Abie - - 2010
In an effort to validate previous theoretical studies of phonation onset [Z. Zhang, J. Acoust. Soc. Am. (2009); J. Acoust. Soc. Am. (2010)], the dependence of phonation threshold pressure and phonation onset frequency on vocal fold stiffness and geometry was experimentally investigated in a two-layer physical model of the vocal ...
Aravamudhan Radhika - - 2010
A substantial body of literature has focused on context effects in speech perception in which manipulation of the phonemic or spectral content of preceding sounds (e.g., ∕al∕ versus ∕ar∕) result in a shift in the perceptual categorization of a target syllable (e.g., ∕da∕ versus ∕ga∕). In a previous study utilizing ...
Enzinger Ewald - - 2010
Several approaches to forensic speaker comparison rely on formant center-frequency measurements as features due to their rather straightforward interpretation as resonance frequencies of the cavities of the human vocal tract. Formant tracking algorithms, mostly based on linear predictive coding, are commonly used for automatic extraction. Telephone conversations constitute a substantial ...
Herrera Abel - - 2010
The Mel scale was proposed in 1937, following a series of experiments used to establish a perceptual scale. The use of the Mel scale is almost standard for speech recognition application. The Bark scale divides the audible spectrum into 24 critical bands that try to mimic the frequency response of ...
Garellek Marc - - 2010
Although there are many studies on the acoustics of phonation, few deal specifically with the coarticulation of non-modal phonations. Using data from three languages (English, White Hmong, and Korean), this project describes the acoustics of breathy-to-creaky phonation contours in vowels. In English, such contours are found in vowels preceded by ...
Cai Shanqing - - 2010
In order to test whether auditory feedback is involved in the planning of complex articulatory gestures in time-varying phonemes, the current study examined native Mandarin speakers' responses to auditory perturbations of their auditory feedback of the trajectory of the first formant frequency during their production of the triphthong /iau/. On ...
Browning David G - - 2010
The perissodactyls (odd-toed ungulates) comprised of equines, rhinos, and tapirs have vocalizations during which the frequency spectra can change, in contrast to the artiodactyls (even-toed ungulates), comprised of cows, sheep, deer, etc., whose vocalizations are primarily tonals. This suggests that a simple vocal expression by perissodactyls may be possible, and ...
Oropeza Rodriguez Jose Luis - - 2010
One of the most important aspects related with automatic speech recognition (ASRs) systems is to find a set of characteristics that represent speech signal; nowadays, LPC, CLPC, cepstrum, MFCC, LFCC, and Melspec, among others, have been used to solve that problem. Likewise, analyzing the audible behavior of the ear has ...
Tamati Terrin N - - 2010
Italy is a linguistically diverse country where a standard language (standard Italian) is in contact with various regional languages. Within this setting, the regional languages have influenced the standard Italian spoken throughout Italy and regional dialects of Standard Italian have emerged. Previous studies on the regional dialects of Standard Italian ...
Reijniers Jonas - - 2010
It has been argued that an important part of understanding bat echolocation comes down to understanding the morphology of the bat sound processing apparatus. In this Letter we present a method based on information theory that allows us to assess target localization performance of bat sonar, without a priori knowledge on ...
Li Tianhao T Division of Communication and Auditory Neuroscience, House Ear Institute, Los Angeles, CA 90057, USA. - - 2010
The present study used eight normal-hearing (NH) subjects, listening to acoustic cochlear implant (CI) simulations, to examine the effects of spectral shifting on speech recognition in noise. Speech recognition was measured using spectrally matched and shifted speech (vowels, consonants, and IEEE sentences), generated by 8-channel, sine-wave vocoder. Measurements were made ...
Suthers Roderick A RA Medical Sciences, School of Medicine, Indiana University, Bloomington, IN 47405, USA. - - 2011
Australian magpies (Gymnorhina tibicen) are notable for their vocal prowess. We investigated the syringeal and respiratory dynamics of vocalization by two 6-month-old males, whose songs had a number of adult features. There was no strong lateral syringeal dominance and unilateral phonation was most often achieved by closing the syringeal valve ...
Beach Elizabeth Francis - - 2011
It is important to ensure that hearing aid fitting strategies for infants take into account the infant's developing speech perception system. As a way of exploring this issue, this study examined how 6- and 9-month-olds with normal hearing perceive native-language speech in which the natural spectral shape was altered to ...
Başkent Deniz D Department of Otorhinolaryngology/Head and Neck Surgery, University Medical Center Groningen, Groningen, The Netherlands. - - 2010
Recognition of periodically interrupted sentences (with an interruption rate of 1.5 Hz, 50% duty cycle) was investigated under conditions of spectral degradation, implemented with a noiseband vocoder, with and without additional unprocessed low-pass filtered speech (cutoff frequency 500 Hz). Intelligibility of interrupted speech decreased with increasing spectral degradation. For all ...
Regner Michael F MF Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53706, - - 2011
This study hypothesized that phonation threshold power is measureable and sensitive to changes in the biomechanical properties of the vocal folds. Phonation threshold power was measured in three sample populations of 10 excised canine larynges treated with variable posterior glottal gap, variable bilateral vocal fold elongation, and variable vocal fold ...
Li Ning - - 2010
Cochlear implant (CI) users are unable to receive masking release and the reasons are unclear. The present study examines the hypothesis that when listening to speech in fluctuating maskers, CI users cannot fuse the pieces of the message over temporal gaps because they are not able to perceive reliably the ...
Hu Yi - - 2010
Several studies have demonstrated that telephone use presents a challenge for most cochlear implant (CI) users, and this is attributed mainly to the narrow bandwidth (300-3400 Hz) introduced by the telephone network. The present study focuses on answering the question whether telephone speech recognition in noise can be improved by ...
Fiasconaro Alessandro - - 2010
In this work we study the presence of both a minimum and clear oscillations in the frequency dependence of the translocation time of a polymer described as a unidimensional Rouse chain driven by a spatially localized oscillating linear potential. The observed oscillations of the mean translocation time arise from the ...
Riede Tobias T Department of Biology and National Center for Voice and Speech, University of Utah, Salt Lake City, UT 84112, USA. - - 2010
Fundamental frequency is an important perceptual parameter for acoustic communication in mammals. It is determined by vocal fold oscillation, which depends on the morphology and viscoelastic properties of the oscillating tissue. In this study, I tested if stress-strain and stress-relaxation behavior of rhesus monkey (Macaca mulatta) vocal folds allows the ...
De Lucia Marzia - - 2010
The ability to discriminate conspecific vocalizations is observed across species and early during development. However, its neurophysiologic mechanism remains controversial, particularly regarding whether it involves specialized processes with dedicated neural machinery. We identified spatiotemporal brain mechanisms for conspecific vocalization discrimination in humans by applying electrical neuroimaging analyses to auditory evoked ...
Song Judy H JH Auditory Neuroscience Laboratory, Northwestern University, Evanston, IL 60208, - - 2011
The speech-evoked auditory brainstem response (ABR) provides an objective measure of subcortical encoding of complex acoustic features. However, the intrasubject reliability of this response in both optimal and challenging listening conditions has not yet been systematically documented. This study aimed to evaluate test-retest reliability of the speech-evoked ABR in young ...
Kahlau R - - 2010
We introduce a three-parameter step-response function which is based on a generalization of the Cole-Davidson (CD) and Kohlrausch (K) functions, and which provides a highly flexible susceptibility description for viscous liquids. A second parameter α characterizing the overall width, in addition to a parameter β determining the high-frequency behavior of ...
Mehta Daryush D - - 2011
In prior work, a manually derived measure of vocal fold vibratory phase asymmetry correlated to varying degrees with visual judgments made from laryngeal high-speed videoendoscopy (HSV) recordings. This investigation extended this work by establishing an automated HSV-based framework to quantify 3 categories of vocal fold vibratory asymmetry. HSV-based analysis provided ...
Du Yi - - 2011
In noisy social gatherings, listeners perceptually integrate sounds originating from one person's voice (e.g., fundamental frequency (f(0)) and harmonics) at a particular location and segregate these from concurrent sounds of other talkers. Though increasing the spectral or the spatial distance between talkers promotes speech segregation, synergetic effects of spatial and ...
Roberts Brian - - 2010
Speech comprises dynamic and heterogeneous acoustic elements, yet it is heard as a single perceptual stream even when accompanied by other sounds. The relative contributions of grouping "primitives" and of speech-specific grouping factors to the perceptual coherence of speech are unclear, and the acoustical correlates of the latter remain unspecified. ...
< 7 8 9 10 11 12 13 14 15 16 17 >