PC INTERFACE CARD WITH FUNCTION OF OSCILLOSCOPE AND FREQUENCY ANALYZER

摘要

PURPOSE: A PC interface card is provided to implement an oscilloscope and a frequency analyzer function between a PC, offering a EISA(Extended Industry Standard Architecture) slot interface, and a peripheral, generating low level frequency signals so that it can reduce a frequency analysis cost. CONSTITUTION: A PC interface card comprises a signal input module(20), an EISA slot(10), and a signal output module(30). The signal input module(20) receives low frequency signals generated from a peripheral, converts the low frequency signals into digital signals, and analyzes the digital signals. The signal input module(20) includes an amplifier(21), a low pass filter(22), a switch(23), an AD converter(24), and an FFT(Fast Fourier Transform) processor(25). The EISA slot(10) performs an interface function. The signal output module(30) transmits the low frequency signals from the PC to the peripheral. The signal output module(30) includes a buffer(31), an IFFT(Inverse Fast Fourier Transform)(32), a DA converter(34) and an amplifier(35).