The field of electric drives provides a broad spectrum of applications with different power demands, utilized motor types or different environment requirements. Lot of applications are characterized by very high demands on accuracy and dynamic properties and have attribute of…

The fiber optic sensors are used in various industries. Advantages of optical sensors are based on the benefits of fiber and partially profit at their technological advances. The fiber optic temperature sensors are based on more than one way of…

High precision electrical resistance measurements were performed in the low  temperature range from 4.2 K up to room temperature on a holmium bulk sample, and on holmium thin films in magnetic field. The X-ray diffraction of Ho films confirmed  their preferential crystal…

In this paper the binary modulation formats and their application in passive optical networks have been discussed. Passive optical networks are characterized by dividing the optical signal between several end users by using passive splitters, which added a significant attenuation…

The paper deals with problems of safety and security principles within wireless industrial communication systems. First safety requirements to wireless industrial communication system, summarisation of attack methods and the available measures for risks elimination are described with orientation to safety…

This paper deals with VoIP communication security and various techniques of VoIP attacks. We divided these threats in several categories according to their specific behaviour and their impact on the affected system. We also tried to find effective methods to…

Power supply of intelligent houses or house phones is possible to do with standard transformer with voltage stabilizer or with intelligent power supply. Standard solution can has as a result of failure fuse blown or fire occurrence. Intelligent power supply…

Delay in VoIP technology is very unpleasant issue and therefore a voice packets prioritization must be ensured. To maintain the high call quality a maximum information delivery time from the sender to the recipient is set to 150 ms. This…

In this paper spectral subtractive method and some of its modification are compared. Performance of spectral subtraction, its limitations, artifacts introduced by it, and spectral subtraction modifications for eliminating these artifacts are discussed in the paper in details. The algorithms…

The term “telematics”, which originated more than ten years ago, stands for integration of technologies and solutions from the field of telecommunication, automation and computer science. Telematics is the combination of words “tele” (transfer at some distance, remote access) and…