Physical Acoustics and Measurements Pertaining to Directional Hearing

Kuhn, George F.

doi:10.1007/978-1-4612-4738-8_1

Cited by 71 publications

(45 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since for each pair of samples collected, the right microphone sample was sampled before the left, it was expected that the main beam would be skewed slightly to the right. For low frequencies, this skew corresponds to approximately 3.3 deg, whereas for high frequencies this corresponds to approximately 5 deg (Kuhn, 1987).…”

Section: Portable Adaptive Beamformer Implementationmentioning

confidence: 95%

Evaluation of a portable two-microphone adaptive beamforming speech processor with cochlear implant patients

Hoesel

Clark

1995

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

A two-microphone noise reduction technique was tested with four cochlear implant patients. The noise reduction technique, known as adaptive beamforming (ABF), used signals from only two microphones--one behind each ear--to attenuate sounds not arriving from the direction directly in front of the patient. The algorithm was implemented in a portable digital signal processor, and was compared with a strategy in which the two microphone signals were simply added together (two-microphone broadside strategy). Tests with the four patients were conducted in a soundproof booth with target speech arriving from in front of the patient and multitalker babble noise arriving at 90 deg to the left. Results at 0-dB signal-to-noise level (S/N) showed large improvements in speech intelligibility for all patients, when compared to the two-microphone broadside strategy. Precautions were taken to avoid cancellation of the target speech, and, accordingly, subjective tests showed no deterioration in performance for the adaptive beamformer in quiet. Physical measurement of the directional characteristics of the ABF was made with the microphones placed behind the ears of a KEMAR manikin and in the same acoustic environment as used with the patients. Results showed directional gain of approximately 10 dB when the angle of incidence for interfering noise was shifted more than 20 to 30 deg from directly in front of or behind the manikin.(ABSTRACT TRUNCATED AT 250 WORDS)

show abstract

Section: Portable Adaptive Beamformer Implementationmentioning

confidence: 95%

Evaluation of a portable two-microphone adaptive beamforming speech processor with cochlear implant patients

Hoesel

Clark

1995

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

show abstract

“…It is also evident that at a 0°incident angle, the sound wave can be well coupled into the metamaterial waveguide and the highest pressure gain can be obtained, while at a 180°incident angle, the pressure gain is minimum due to the serious wave impedance mismatch at the air/metamaterial interface. The strong directional response of the metamaterial can be highly desirable in many acoustic sensing applications, for example, sound source localizations [47][48][49] .…”

Section: Resultsmentioning

confidence: 99%

Enhanced acoustic sensing through wave compression and pressure amplification in anisotropic metamaterials

et al. 2014

View full text Add to dashboard Cite

Acoustic sensors play an important role in many areas, such as homeland security, navigation, communication, health care and industry. However, the fundamental pressure detection limit hinders the performance of current acoustic sensing technologies. Here, through analytical, numerical and experimental studies, we show that anisotropic acoustic metamaterials can be designed to have strong wave compression effect that renders direct amplification of pressure fields in metamaterials. This enables a sensing mechanism that can help overcome the detection limit of conventional acoustic sensing systems. We further demonstrate a metamaterial-enhanced acoustic sensing system that achieves more than 20 dB signal-to-noise enhancement (over an order of magnitude enhancement in detection limit). With this system, weak acoustic pulse signals overwhelmed by the noise are successfully recovered. This work opens up new vistas for the development of metamaterialbased acoustic sensors with improved performance and functionalities that are highly desirable for many applications.

show abstract

“…Detecting elevation by two microphones has long been assumed to be dependent on spectral cues produced by diffraction in the pinna (Blauert 1983;Shaw 1997;Kuhn 1987) and several studies in modelling these cues have been performed based on HeadRelated Transfer Functions. Later research (Avendano et al 1999) has identified elevation cues related to low-frequency reverberation in the human torso.…”

Section: Passive Auditionmentioning

confidence: 99%

Active audition using the parameter-less self-organising map

2008

View full text Add to dashboard Cite

This paper presents a novel method for enabling a robot to determine the position of a sound source in three dimensions using just two microphones and interaction with its environment. The method uses the Parameter-Less SelfOrganising Map (PLSOM) algorithm and Reinforcement Learning (RL) to achieve rapid, accurate response. We also introduce a method for directional filtering using the PL-SOM. The presented system is compared to a similar system to evaluate its performance.

show abstract

Physical Acoustics and Measurements Pertaining to Directional Hearing

Cited by 71 publications

References 14 publications

Evaluation of a portable two-microphone adaptive beamforming speech processor with cochlear implant patients

Evaluation of a portable two-microphone adaptive beamforming speech processor with cochlear implant patients

Enhanced acoustic sensing through wave compression and pressure amplification in anisotropic metamaterials

Active audition using the parameter-less self-organising map

Contact Info

Product

Resources

About