A s discussed in the previous article, a frequency synthesizer can be thought of as a black box containing being properly connected, translate an input reference signal to a number of output frequencies. The synthesizer implementation as well as its ultimate performance depends heavily on characteristics of the individual components used in the design. Although there is no set definition for th...

Annoyance ratings obtained from listening experiments are widely used in studies on health effect of environmental noise. In listening experiments, participants usually give the annoyance rating of each noise sample according to its relative annoyance degree among all samples in the experimental sample set if there are no reference sound samples, which leads to poor comparability between experi...

The electrocardiogram (ECG) is the graphical representation of heart’s functionality. It is an important tool used for the diagnosis of cardiac abnormalities. ECG signals are usually weak and susceptible to external noise and interference. Adaptive filter is a good tool to reduce the influence of ambient noise/interference on the ECG signals. Adaptive filter uses Least mean squares (LMS) algori...

A noisy environment dominated by low frequency noise can often be improved through the use of active noise control. This situation arises naturally in propeller aircraft where the propellers induce periodic low frequency noise inside the cabin. The cabin noise is typically rather high, and the passenger flight comfort could be improved considerably if this level were significantly reduced. This...

We propose a method to determine single hyperspace vectors (product strings of noisebits) by classical means with the same effectiveness as the results using time shifted noise-based logic. A system of binary linear equations based on the amplitudes of the hyperspace vector and the reference noise-bits is set up and solved after enough independent information is collected. The resulting error p...

This paper presents a multi-reference noise reduction system for use in a vehicle. It is aimed at enhancing the driver’s speech in noisy driving environments for applications such as voice commands or hands free phone. First, our system objective is briefly presented as well as the problems of classical techniques, like Beamforming, may face in such a harsh environment as a vehicle cabin. Secon...

background : the recognition of road traffic noise as one of the main sources of environmental pollution has led to develop models that enable to predict noise level from fundamental variables. traffic noise prediction models are required as aids for designing roads and highways. in addition, sometimes are used in the assessment of existing or envisaged changes in traffic noise conditions. in t...