Abstract: Method for detection of skimming devices comprising detecting electromagnetic emissions by sensors of the invention located inside of ATM. Electromagnetic emission is monitored in broad band of 10 kHz to 30 MHz and narrow band, and only one determined frequency is passed through filters in the narrow band, and sensors' output is analyzed and processed according to algorithm of the invention. Alarm signal is generated upon achieving pre-assigned threshold chosen so that discriminating between useful signal and interference is not obstructed. The method is implemented by device comprising sensors for detecting electromagnetic emissions, microcontroller for controlling the sensors, master microcontroller for processing of sensors' output, and notifying module for sending signals to control center. According to the invention sensor is provided for detecting electromagnetic emissions comprising receiving, regulating, filtering and converting parts.

Abstract: A line frequency detector receives an input signal representing a power source and detects a line frequency of the power source based on the input signal. The line frequency detector includes a first band pass filter having a pass band centered at an upper end of an expected frequency range of the power source and a second band pass filter having a pass band centered at a lower end of the expected frequency range. The input signal is filtered by the first and second band pass filters, generating a first characteristic signal and a second characteristic signal. The line frequency detector determines a characteristic ratio between the first characteristic signal and the second characteristic signal, and maps the characteristic ratio to the line frequency of the power source.

Abstract: An RF signal reception device including: a transposition device of signals of frequency fRF to a first intermediate frequency IF1<fRF; a first bandpass filter centered on IF1; a sampler at a frequency fs<IF1; a second discrete-time filter centered on a second intermediate frequency IF2=?·fs/M+fs/(M·n); a decimation device of a factor M; an analog-digital convertor to operate at a frequency fs/M; where ?, n and M are strictly positive real numbers chosen such that: ?<fs/(2·BWch·M), and BWch/2<fs/M·n), with BWch: bandwidth of a channel of the received RF signals.

Abstract: A tone signal received in a telecommunications network is bandpass filtered based on an identified type of the received tone signal, providing a bandpass filtered tone signal. The tone signal is also bandstop filtered based on the identified type of the received tone signal, providing a bandstop filtered tone signal. The bandpass filtered tone signal and the bandstop filtered tone signal are analysed and the received tone signal is quantified based on the analysis result.

Abstract: In adopting a structure in which an oscillator circuit unit and an instrument main body including a measuring unit are separately formed in a sensing instrument measuring the concentration of or determining the presence/absence of a substance to be sensed by using a quartz sensor, the present invention has an object to enable the instrument main body side to know an oscillation frequency of the connected oscillator circuit unit.

Abstract: A circuit (100) for detecting the duty cycle of clock signals comprises an oscillator (2) whose signal can be changed into a square-wave voltage in a gate (3). In order to obtain a simple construction of the circuit (100) with improved quality of the output signals a low-pass filter (3) is provided whose output signal is situated between “low” and “high”.

Abstract: An analog filter in an integrated circuit is tested by placing the filter in a feedback loop. The filter is tested by determining whether the analog filter, while in the feedback loop, provides a signal that oscillates within a predetermined tolerance of an expected frequency.

Abstract: A wide band signal analyzer includes a frequency converter for converting a signal under test to an intermediate frequency signal. A narrow band signal processor receives the intermediate frequency signal and produces a first digital signal representing a first frequency band of the intermediate frequency signal and a wide band signal processor receives the intermediate frequency signal and produces a second digital signal representing a second frequency band of the intermediate frequency signal. A transfer rate decelerator decelerates the transfer rate of the second digital signal, and a digital processor processes selectively the first digital signal or the output signal of the transfer rate decelerator. A memory stores the processed output of the digital processor.