A two-channel digital instrument for real-time analysis

Summary form only given. A measurement system is described which is based on a digital signal processing chip that can analyze the mutual relationship (power, correlation, etc.) between two arbitrarily shaped signals, providing real-time operation up to 10-kHz sampling frequency. Twin 12-bit A/D converters simultaneously controlled by the same clock signal are used to preserve the essential phase relationship. Acquired real signals are considered as the real and imaginary part of a complex sample sequence and suitably processed by a signal fast Fourier transform algorithm, from which discrete Fourier transform coefficients of both signals are derived.<>