An approach to the measurement of distortion in hearing aids is presented. Distortion is first defined in general terms. The technique is then applied to the specific problem of predicting the detectability of non-linear distortion. Distortion indices have been obtained for two common, but very different forms of distortion: peak clipping (common to most conventional hearing aids); and, quantiz...

This note discusses distortion in JFET amplifiers and how to operate a JFET amplifier with low distortion. JFETs are typically used in the first stage of an amplifier where the signal amplitude is so small (microvolts up to maybe a few millivolts) that nonlinear effects are negligible. The distortion becomes significant at larger amplitudes where JFETs are not normally used–at least in open-loo...

We present a fast algorithm for non-linear dimension reduction. The algorithm builds a local linear model of the data by merging PCA with clustering based on a new distortion measure. Experiments with speech and image data indicate that the local linear algorithm produces encodings with lower distortion than those built by five layer auto-associative networks. The local linear algorithm is also...

Abstract. We present a new approach for self-calibrating the distortion function and the distortion center of cameras with general radially symmetric distortion. In contrast to most current models, we propose a model encompassing fisheye lenses as well as catadioptric cameras with a view angle larger than 180o. Rather than representing distortion as an image displacement, we model it as a varyi...

background and aims. panoramic radiography is a method widely used because of low absorbed dose in patients (approximately 10 times less than that in the full mouth survey), reasonable cost and time. disadvantages of this radiography technique are magnification and distortion as a result of unequal magnification, which can influence dimensional and angular measurements used in clinical dentistr...

The inftuence of bandpass non-linear distortion on an OFDM signal is investigated. The spectrum of the distorted sig@ and tbe resulting detection errors are detsrndned. Non-linear distortion of OFDM signals CaU sigdcantly increase the reeeiver BER. Previous S@WS rSIy on simulation, or apply to specific non-linearities only. He% an analysk is presented which is applicable to any weakly non-linea...