Amplitude probability distribution measurement apparatus

An amplitude probability distribution measurement apparatus comprising:

• a frequency analysis unit comprising A/D conversion means for sampling an input signal, converting the input signal into digital data, and outputting the digital data and FFT type frequency selection means for extracting frequency band components to be measured from the digital data using at least an FFT operation;
• a level detection unit for detecting an amplitude of each of the frequency band components to be measured, acquired by the frequency analysis unit;
• and
• an amplitude probability distribution measurement unit for finding an amplitude probability distribution, which is a probability that an amplitude of each measurement frequency band component to be measured exceeds a predetermined threshold value, every lapse of time,
• wherein the amplitude probability distribution measurement apparatus further comprises resolution bandwidth (RBW)/measurement channel control means including a clock generator for generating a clock signal, wherein the RBW/measurement channel control means changes a cycle of the clock signal generated by the clock generator and changes a resolution bandwidth when measurement is performed, a number of channels to be measured which is a number of measurement frequency band components, or said predetermined time when an amplitude probability distribution is measured by sending the clock signal to each of the A/D conversion means, the frequency selection means, and the amplitude probability distribution measurement unit.

An amplitude probability distribution measurement method comprising:

• an Analog/Digital (A/D) conversion step for sampling an input signal, converting the input signal into digital data, and outputting the digital data;
• a frequency analysis step for frequency selecting to extract predetermined frequency band components to be measured from the digital data;
• a level detection step for detecting an amplitude of each of the frequency band components to be measured which are acquired by the frequency analysis step;
• and
• an amplitude probability distribution measurement step for finding an amplitude probability distribution, which is a probability that an amplitude of each measurement frequency band component to be measured exceeds a predetermined threshold value, every lapse of time,
• wherein said frequency selecting step comprises a Fast Fourier Transform (FFT) type processing step using a filter for extracting said frequency band components to be measured from the digital data through an FFT operation, filter bank type processing step using a plurality of filters for extracting said frequency band components from the digital data, and a switching step for switching an output extracted from said FFT type processing step and an output extracted from said filter bank type processing step according to said frequency band components to be measured.