To study the possible interference of low frequency noise on performance and annoyance, subjects categorised as having a high- or low sensitivity to noise in general and low frequency noise in particular worked with different performance tasks in a noise environment with predominantly low frequency content or flat frequency content (reference noise), both at a level of 40 dBA. The effects were ...

The γ-index test has been commonly adopted to quantify the degree of agreement between a reference dose distribution and an evaluation dose distribution. Monte Carlo (MC) simulation has been widely used for the radiotherapy dose calculation for both clinical and research purposes. The goal of this work is to investigate both theoretically and experimentally the impact of the MC statistical fluc...

This paper presents a simple adaptive algorithm based on the adaptive notch two-taps filter [1] and the filtered-X LMS algorithm [2], to be used in active noise control applications, The system consists of two adaptive algorithms working together. One algorithm estimates on-line the error path transfer fi.mction as proposed in [3] and the other cancels a i%equency narrowband of the residual sig...

This paper presents adaptive noise canceling(ANC) using convolved reference noise. In many practical ANC applications, the reference noise has channel distortion, which may degrade its performance. If the distortion includes nonminimum-phase parts, the inverse cannot be implemented as a causal filter. Therefore, the conventional ANC system may not provide a satisfactory performance. In this pap...

The design of a double balanced CMOS downconversion mixer is presented with a novel calibration scheme for pulse injection flicker noise reduction. This self-biasing calibration technique enables the reduction of the mixers’ noise figure by over 20dB at baseband frequencies without any additional reference voltages, manual adjustment, or large inductors. This results in simpler IC testing and m...

In this paper, we propose a full-reference objective quality evaluation method for noise-reduced speech. In the proposed method, acoustical features are extracted from input noisereduced speech and its original clean version, and then the speech quality and the noise quality are estimated separately from these features. Finally, the overall quality is determined from the estimates of the speech...

Genomic copy number variation underlies genetic disorders such as autism, schizophrenia, and congenital heart disease. Copy number variations are commonly detected by array based comparative genomic hybridization of sample to reference DNAs, but probe and operational variables combine to create correlated system noise that degrades detection of genetic events. To correct for this we have explor...

This paper presents the aerodynamic design of low noise wind turbine blades using Betz and Joukowski concepts. The aerodynamic model is based on Blade Element Momentum theory whereas the aeroacoustic prediction model is based on the BPM model. The investigation is started with a 3MW baseline/reference turbine rotor with a diameter of 80 m. To reduce the noise emission from the baseline rotor, t...

Single particle reconstructions derived from electron micrographs yield increasing detail of biological molecules and assemblies. However, it is well-known that alignment of pure noise images against a reference can recover that reference on reconstruction [1]. The question is how to distinguish a reconstruction from noise from one from legitimate particle images. Figure 1A shows the estimated ...

The current sources which are normally used in research laboratories are not suitable for low noise measurement systems because of the unacceptable level of low frequency noise which they introduce in the measurement chain. The most important source of low frequency noise in such instruments is the solid state device (usually a Zener diode) which is used as voltage reference. By using a novel c...