計測と制御

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This paper reports a high-speed digital correlator operating in real-time and a spectrum analyzer which converts the output of the correlator into the power spectrum.
The correlator employs three magnetostrictive delay lines as its main storage units and computes the values of auto- or cross-correlation function of the analog input signals at one hundred equally spaced points on the time delay axis simultaneously. The computed results are DA converted and displayed on a cathode-ray tube in the form of a bar-graph. The measured correlation function is always up-to-date and automatically follows the change of the input signals. With a special method of sampling of the input signals, the increment of the time delay can be made as small as 200μs, which enable us, for instance, to make a real-time analysis of actually spoken voices.
The spectrum analyzer receives the digital output of the correlator and multiplies it by an internally generated sinusoidal function. This Fourier transformation is performed at one hundred different frequencies and the final output is displayed on a cathode-ray tube at every 200ms, giving the entire form of the power spectrum within a specified frequency range. All the computations are performed digitally except the modification of output by the hamming window.
Some applications of this signal processing system in various fields are described. A brief survey of real-time signal processors is also included in this paper.

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