| 摘要 |
PROBLEM TO BE SOLVED: To detect an event in spectra of a frequency range of concern buried in a noise floor of signal spectra. SOLUTION: An A/D converter 30 digitizes an IF signal and supplies it to a circulation buffer 42 within a trigger generator 40. A window function circuit 44 and a discrete Fourier transformation circuit 46 convert segments of time dimensional data showing an input signal to a frequency spectrum composed of a plurality of frequency bins. An integrator 48 integrates the magnitudes of powers extending over a specified bandwidth of the frequency bins to determine an average signal power in this specified bandwidth. A comparator 50 compares the average signal power with a designated power level REF, and generates a trigger signal in case that the average signal power violates the designated power level. real-time power mask trigger generator for an instrument that acquires data in response to a trigger signal integrates power amplitudes over a defined bandwidth within a frequency spectrum for an input signal to produce an average signal power, and compares the average signal power with a specified reference power level for the defined bandwidth. Violation of the reference power level by the average signal power generates the trigger signal for acquiring data from the input signal about the trigger event by the instrument. The frequency spectrum may be divided into more than one defined frequency bandwidth, and each defined frequency bandwidth may have its own specified reference power level. The defined frequency bandwidths and associated reference power levels define a real-time power mask trigger. COPYRIGHT: (C)2006,JPO&NCIPI
|
