Amplitude modulation of background noise varies listeners’ spectral weights for sentence recognition

2021 ◽  
Vol 150 (4) ◽  
pp. A274-A274
Author(s):  
Yi Shen ◽  
Lauren Langley
Keyword(s):  
Amplitude Modulation ◽  
Background Noise ◽  
Sentence Recognition

scholarly journals Effect of amplitude modulation of background noise on auditory-evoked magnetic fields

2008 ◽  
Vol 1239 ◽  
pp. 191-197 ◽  
Author(s):  
Harukazu Hiraumi ◽  
Takashi Nagamine ◽  
Takeshi Morita ◽  
Yasushi Naito ◽  
Hidenao Fukuyama ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Amplitude Modulation ◽  
Background Noise ◽  
Auditory Evoked Magnetic Fields

scholarly journals Sentence Recognition in Noise and Perceived Benefit of Noise Reduction on the Receiver and Transmitter Sides of a BICROS Hearing Aid

2013 ◽  
Vol 24 (10) ◽  
pp. 980-991 ◽  
Author(s):  
Kristi Oeding ◽  
Michael Valente
Keyword(s):  
Noise Reduction ◽  
Hearing Aids ◽  
Repeated Measures ◽  
Background Noise ◽  
Signal To Noise Ratio ◽  
Hearing Aid ◽  
Directional Microphones ◽  
Sentence Recognition ◽  
Clinically Significant ◽  
The Impact

Background: In the past, bilateral contralateral routing of signals (BICROS) amplification incorporated omnidirectional microphones on the transmitter and receiver sides and some models utilized noise reduction (NR) on the receiver side. Little research has examined the performance of BICROS amplification in background noise. However, previous studies examining contralateral routing of signals (CROS) amplification have reported that the presence of background noise on the transmitter side negatively affected speech recognition. Recently, NR was introduced as a feature on the receiver and transmitter sides of BICROS amplification, which has the potential to decrease the impact of noise on the wanted speech signal by decreasing unwanted noise directed to the transmitter side. Purpose: The primary goal of this study was to examine differences in the reception threshold for sentences (RTS in dB) using the Hearing in Noise Test (HINT) in a diffuse listening environment between unaided and three aided BICROS conditions (no NR, mild NR, and maximum NR) in the Tandem 16 BICROS. A secondary goal was to examine real-world subjective impressions of the Tandem 16 BICROS compared to unaided. Research Design: A randomized block repeated measures single blind design was used to assess differences between no NR, mild NR, and maximum NR listening conditions. Study Sample: Twenty-one adult participants with asymmetric sensorineural hearing loss (ASNHL) and experience with BICROS amplification were recruited from Washington University in St. Louis School of Medicine. Data Collection and Analysis: Participants were fit with the National Acoustic Laboratories’ Nonlinear version 1 prescriptive target (NAL-NL1) with the Tandem 16 BICROS at the initial visit and then verified using real-ear insertion gain (REIG) measures. Participants acclimatized to the Tandem 16 BICROS for 4 wk before returning for final testing. Participants were tested utilizing HINT sentences examining differences in RTS between unaided and three aided listening conditions. Subjective benefit was determined via the Abbreviated Profile of Hearing Aid Benefit (APHAB) questionnaire between the Tandem 16 BICROS and unaided. A repeated measures analysis of variance (ANOVA) was utilized to analyze the results of the HINT and APHAB. Results: Results revealed no significant differences in the RTS between unaided, no NR, mild NR, and maximum NR. Subjective impressions using the APHAB revealed statistically and clinically significant benefit with the Tandem 16 BICROS compared to unaided for the Ease of Communication (EC), Background Noise (BN), and Reverberation (RV) subscales. Conclusions: The RTS was not significantly different between unaided, no NR, mild NR, and maximum NR. None of the three aided listening conditions were significantly different from unaided performance as has been reported for previous studies examining CROS hearing aids. Further, based on comments from participants and previous research studies with conventional hearing aids, manufacturers of BICROS amplification should consider incorporating directional microphones and independent volume controls on the receiver and transmitter sides to potentially provide further improvement in signal-to-noise ratio (SNR) for patients with ASNHL.

scholarly journals Sentence Recognition Error of Hearing-Impaired Elderly in Background Noise and Time Alteration: Case Analysis

2016 ◽  
Vol 12 (4) ◽  
pp. 280-288 ◽  
Author(s):  
Wondo Na ◽  
Gibbeum Kim ◽  
Gungu Kim ◽  
Jihyeon Lee ◽  
Woojae Han
Keyword(s):  
Background Noise ◽  
Case Analysis ◽  
Hearing Impaired ◽  
Recognition Error ◽  
Sentence Recognition

Preservation of amplitude modulation coding in the presence of background noise by chinchilla auditory‐nerve fibers

1996 ◽  
Vol 99 (1) ◽  
pp. 475-490 ◽  
Author(s):  
Robert D. Frisina ◽  
Kenneth J. Karcich ◽  
Todd C. Tracy ◽  
Daniel M. Sullivan ◽  
Joseph P. Walton ◽  
...  
Keyword(s):  
Amplitude Modulation ◽  
Auditory Nerve ◽  
Background Noise ◽  
Nerve Fibers ◽  
Modulation Coding ◽  
Auditory Nerve Fibers

Prediction of Urban Air Mobility Multirotor VTOL Broadband Noise Using UCD-QuietFly

2021 ◽  
Author(s):  
Sicheng (Kevin) Li ◽  
Seongkyu Lee
Keyword(s):  
Amplitude Modulation ◽  
Noise Level ◽  
Background Noise ◽  
Prediction Method ◽  
Broadband Noise ◽  
Urban Air ◽  
Noise Prediction ◽  
Vehicle Noise ◽  
Trailing Edge Noise ◽  
Prediction Program

This paper investigates broadband noise of multirotor urban air mobility (UAM) vertical take-off and landing (VTOL) vehicles. Based on an earlier single-rotor trailing-edge noise prediction method, a multirotor broadband noise prediction program is developed, where the multirotor coordinate transformation is included, and the amplitude modulation capability is introduced. Thereafter, the program is used to predict broadband noise from three UAM VTOL conceptual designs and a vertiport conceptual design. It is found that UAM VTOL vehicles' broadband noise is important in the high-frequency range, where the community background noise level is typically low. For the same mission specifications, broadband noise is found to be higher for VTOL designs with more rotors. UAM vehicle noise is compared to conventional helicopter noise. It is found that the amplitude modulation of broadband noise of a single rotor is insignificant when the observer distance is larger than four rotor radii. Multirotor vehicles at the same rotational speeds have weaker amplitude modulations than a single rotor, which demonstrates the benefits of using multiple rotors in terms of noise annoyance. Finally, noise contours from a vertiport design show an increase in the broadband noise level when multiple VTOL vehicles are operated simultaneously.

The Words-in-Noise (WIN) Test with Multitalker Babble and Speech-Spectrum Noise Maskers

2007 ◽  
Vol 18 (06) ◽  
pp. 522-529 ◽  
Author(s):  
Richard H. Wilson ◽  
Crystal S. Carnell ◽  
Amber L. Cleghorn
Keyword(s):  
Hearing Loss ◽  
Amplitude Modulation ◽  
Background Noise ◽  
Criterion Validity ◽  
Normal Hearing ◽  
Signal To Noise ◽  
Good Criterion ◽  
Monosyllabic Words ◽  
Speech Spectrum ◽  
Better Than

The Words-in-Noise (WIN) test uses monosyllabic words in seven signal-to-noise ratios of multitalker babble (MTB) to evaluate the ability of individuals to understand speech in background noise. The purpose of this study was to evaluate the criterion validity of the WIN by comparing recognition performances under MTB and speech-spectrum noise (SSN) using listeners with normal hearing and listeners with hearing loss. The MTB and SSN had identical rms and similar spectra but different amplitude-modulation characteristics. The performances by the listeners with normal hearing, which were 2 dB better in MTB than in SSN, were about 10 dB better than the performances by the listeners with hearing loss, which were about 0.5 dB better in MTB with 56% of the listeners better in MTB and 40% better in SSN. The slopes of the functions for the normal-hearing listeners (8–9%/dB) were steeper than the functions for the listeners with hearing loss (5–6%/dB). The data indicate that the WIN has good criterion validity. La prueba de Palabras en Ruido (WIN) utiliza palabras monosilábicas en siete tasas de señal/ruido de balbuceo de hablantes múltiples (MTB) para evaluar la capacidad de los individuos de entender lenguaje el medio de ruido de fondo. El propósito del estudio fue evaluar el criterio de validez del WIN comparando el desempeño en reconocimiento del lenguaje bajo ruido MTB y con ruido en el espectro del lenguaje (SSN), utilizando sujetos con audición normal y sujetos con hipoacusia. El MTB y el SSN tienen rms idénticos, y espectros similares, pero diferentes características de modulación de la amplitud. El desempeño de los normo-oyentes, que fue 2 dB mejor en MTB que en SSN, fue 10 dB mejor que el desempeño de los sujetos hipoacúsicos, resultando alrededor de 0.5 dB mejor para MTB, con 56% de los sujetos respondiendo mejor en MTB y 40% mejor en SSN. Las pendientes de la funciones para los sujetos normo-oyentes (8–9 %/dB) fueron más empinadas que las funciones de los sujetos hipoacúsicos (5–6 %/dB). Los datos indican que el WIN tiene un buen criterio de validez.

MODELLING AUDITORY NEURONES WITH HODGKIN AND HUXLEY EQUATIONS — Application to Amplitude Modulation Processing

1995 ◽  
Vol 03 (04) ◽  
pp. 1167-1175
Author(s):  
C. LORENZI ◽  
F. BERTHOMMIER
Keyword(s):  
Amplitude Modulation ◽  
Background Noise ◽  
Point Processes ◽  
Transfer Functions ◽  
Cell Model ◽  
Stellate Cell ◽  
Real Data ◽  
Modulation Transfer ◽  
Low Pass ◽  
Stochastic Aspect

Physiological recordings have shown that stellate cells in the ventral cochlear nucleus (VCN) enhance amplitude modulation (AM) information, relative to their auditory nerve (AN) inputs. Modelling spike-discharge properties of VCN neurones implies to take into account the stochastic aspect of AN fibres firings and the fine temporal aspects of the neural integration occurring at the level of the VCN. These two aspects can be simulated using respectively independent Poisson point processes and a digital integration of Hodgkin and Huxley equations. We determine the response transfer functions to AM, using sinusoidally AM white noises. The resulting modulation transfer functions (MTF) based on spike count is all-pass while the computed MTF based on modulation gain is low-pass at low intensity and bandpass at high intensity. These results are closely compatible with real data and confirm that AM encoding is performed by good response synchrony at preferential AM rates. A detailed study of the nonlinear MTF also predicts two secondary preferential frequencies harmonically related to the primary one. We finally examine the model MTF in the presence of a continuous wideband background noise. AM coding performed by the stellate cell model is robust as simulations show enhanced selectivity in the presence of significant levels of wideband background noise.

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