Experiments Using Pseudo-Random Noise

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Abstract
This paper describes the results of experiments per formed with pseudo-random noise sequences. It is shown that Gaussian noise can be easily produced from such sequences. It is also demonstrated that the sequences themselves have a binomial proba bility distribution. The correlation technique investigated, using pseudo-random noise, makes possible a continuous recording of a system's impulse response without the use of any sophisticated hardware. The impulse re sponse obtained from the cross-correlation experi ment can be approached from either the positive or negative direction, i.e., τ can be made not only a time delay, but also a time advance. This enables one to observe the trailing end of a waveform before viewing its leading end. It also permits a quick ex perimental verification of the correlation property that Rxy(τ) = Ry,r(—τ). Examples for a first- and sec ond-order system are given.

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