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This paper investigates the power module design for better common-mode (CM) noise performance. A high frequency full-bridge diode rectifier is studied as an example. For this circuit, a comprehensive parametric study and a proposed CM equivalent model are first presented to identify the most influential factors in CM noise generation and mitigation. It is shown that proper parasitic value and parasitics...
During the dynamic test of high power switching devices, it can be challenging to measure both high speed and low amplitude signals accurately. This paper uses fast response on-die temperature sensing as an example to investigate the electromagnetic interference control of a typical double pulse test (DPT) setup. Three common noise sources are identified: 1) Conductive common-mode noise caused by...
Ultrasonic ranging device send out ultrasonic pulse for the measurement, the reflected acoustic wave is received by the device and changed into electrical signal by piezoelectric sensor; the distance is calculated according to the time different of sending and receiving. But there is noise in the echo acoustic wave that will affect the quality of the received signal, which will make the reading wrong...
This paper concentrates on speech duration distributions that are usually invariant to noises and proposes a noise-robust and real-time voice activity detector (VAD) using the hidden semi-Markov model (HSMM) to explicitly model state durations. Motivated by statistical observations and tests on TIMIT and the IEEE sentence database, we use Weibull distributions to model state durations approximately...
This paper describes a scale evaluation method using nonsubsampled contourlet transform and its application in pavement image enhancement for crack detection. Crack in some scales is much more visible than in others, so a method for scale evaluation is given, and different gains are delivered to each scale for enhancement after scale evaluation. In the first step, noise threshold is computed by noise...
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