In various kinds of switched-mode power converters, conducted noise due to switching operation frequently causes interference with other electronic equipment. This paper focuses on the common-mode conducted noise generated in switched-mode power converters and presents three examples of noise reduction techniques. First, the common-mode conducted noise is reduced in a common-source type active-...

Monotone noises at high decibels have been identified as a main cause of degradation in people’s mental health. This paper proposes directional monotone noise reduction method to suppress spatially localized single-frequency noises. The system is designed based on feedforward active control (ANC) structure by implementing filtered-x least mean square (FxLMS) algorithms. Compared with traditiona...

 A step-by-step algorithm for enhancement of periodic signals that are highly corrupted by additive uncorrelated white gausian noise is proposed. In each adaptation step a new parallel second-order section is added to the previous filters. Every section has only one adjustable parameter, i.e., the center frequency of the self-tuning filter. The bandwidth and the convergence factor of each secti...

A new adaptive step size adjustment least mean square (LMS) algorithm is presented in this paper. The proposed algorithm modified the existing LMS using the estimated output error as an important component for the modification of the step size. Experiment results demonstrate that application of the new algorithm leads to a significant gain in SNR (signal-to-noise ratio), thus visibly reduces th...

In this paper, two fully-differential low noise amplifiers based on classical cascode topologies are presented. The first one is enhanced with noise canceling technique and the second one is based on a negative feedback stage. These circuits have been designed to fulfill the lower band of SKA requirements with a 1.5 GHz bandwidth below 2 GHz. Both chips have been implemented using NXP QUBIC4G S...

In this paper, we propose a technique of artificial intelligence called adaptive neuro fuzzy inference system (ANFIS) for canceling maternal electrocardiogram (MECG) in fetal electrocardiogram extraction (FECG).This technique is used to estimate the MECG present in the abdominal signal of a pregnant woman. The FECG is then extracted by subtracting the estimated MECG from the abdominal signal. P...

A scheme combining multichannel crosstalk resistant adaptive noise cancellation (MCRANC) algorithm and improved spectrum subtraction (ISS) algorithm is presented to enhance noise carrying speech signals. The scheme would permit locating the microphones in close proximity by virtue of using MCRANC which has the capability of removing the crosstalk effect. MCRANC would also permit canceling out n...

Differential microphone array is known to have low sensitivity to distant sound sources. Such characteristics may be advantageous in voice activity detection where it can be assumed that the target speaker is close and background noise sources are distant. In this paper we develop a simple modification to the EVRC rate determination algorithm (EVRC RDA) to exploit the noise-canceling property o...