Topic
Dynamic range
About: Dynamic range is a research topic. Over the lifetime, 7576 publications have been published within this topic receiving 101739 citations. The topic is also known as: DNR & DR.
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TL;DR: A polymeric micro-cantilever array has been developed that mimics the biological front-end processing in the mammalian cochlea, and is intended for use in applications of auditory prostheses as discussed by the authors.
Abstract: A polymeric micro-cantilever array has been developed that mimics the biological front-end processing in the mammalian cochlea, and is intended for use in applications of auditory prostheses. Made of optical epoxy polymer molded over a silicon substrate, the micro-cantilevers have similar mechanical performance as the basilar membranes in the mammalian ears. The polymeric cantilevers, which are transparent, are used as optical waveguides to guide and modulate a light beam, which is initiated from a light emitting diode (LED) and collected by a photo diode, to produce a signal suitable for human hearing when the sound wave excites them. The polymeric cantilevers have Q10 values of 9.38, 10.11, 11.56, and 14.01 for resonant frequencies at 286, 720, 2868, and 6948 Hz, respectively. These values are similar to those obtained by direct measurement of the basilar membrane. Furthermore, they have a linear dynamic range of more than 80 dB sound pressure level (SPL) with less than 15% total harmonic distortion (THD). This polymeric micro-cantilever array has low power consumption, short processing time, high sensitivity, high frequency resolution, small size, is insensitive to electromagnetic interference, and is suitable for a totally implantable device in the human ear. © 2003 Elsevier B.V. All rights reserved.
50 citations
Patent•
27 Sep 1996TL;DR: In this paper, a context-dependent dynamic range remapping system utilizes background estimation, mask generation, parameter estimation and dynamic range re-mapping of an original image to provide an optimum output image.
Abstract: A contexture dependent dynamic range remapping system utilizes background estimation, mask generation, parameter estimation and dynamic range remapping of an original image to provide an optimum output image. The dynamic range remapping includes an additive algorithm or a multiplicative algorithm or a combination of both algorithms. The output from the algorithms could be filtered by an edge-preserving filter to provide a filtered output image. The system adaptively compresses the dynamic range of the DC and slow-varying signals in the original image significantly while preserving and enhancing fine structures.
50 citations
TL;DR: WDRC processing, fitted using the DSL[i/o] method, has potential applications in hearing aid fittings for listeners with moderate to severe hearing loss because it provides an audible, comfortable and tolerable amplified signal across a wider range of inputs than linear gain processing, without the need for volume control adjustments.
Abstract: Objectives:The goal of this study was to test the theoretical advantages of a single-channel wide dynamic range compression (WDRC) circuit fitted using the DSL method for increased dynamic range and normalized loudness growthDesign:Ten adolescents and young adults with moderate to severe sensorineu
50 citations
TL;DR: A new design of pulse-contrast-measuring correlator, based on optical parametric amplification, that amplifies the wings of the pulse and allows high-cont contrast measurement with a low-sensitivity detector is presented.
Abstract: A new design of pulse-contrast-measuring correlator, based on optical parametric amplification, is presented. It amplifies the wings of the pulse and allows high-contrast measurement with a low-sensitivity detector. The test system demonstrates an ability to measure a dynamic range of >10(11):1.
50 citations
TL;DR: In this paper, a simple fiber optic displacement sensor is presented using a multimode plastic bundled fiber and the intensity modulation technique, and the performance of the sensor is compared for different types of probes and targets.
Abstract: A simple fiber optic displacement sensor is presented using a multimode plastic bundled fiber and the intensity modulation technique. The performance of the sensor is compared for different types of probes and targets. The probe with the largest receiving core diameter demonstrates the highest linearity range, and increasing the number of receiving cores increases the sensitivity of the sensor. With a stainless steel target and the concentric bundled fiber with 16 receiving fibers as a probe, the sensitivity of the sensor is found to be 0.0220 mV/μm over 150 to 550 μm range and – 0.0061 mV/μm over 1100 to 2000 μm range. The target with a higher reflectivity shows a higher sensitivity. The linearity range for the front slope is almost similar for all targets tested. However, for the back slope, lower reflectivity objects have a relatively higher linearity range with the highest range of 1600 μm being obtained using plastic and aluminum targets. The simplicity of the design, high degree of sensitivity, dynamic range, non-contact measurement and low cost of the fabrication make it suitable for applications in industries for position control and micro displacement measurement in the hazardous regions.
50 citations