WAVEFORM MEMORY METHOD

PURPOSE:To make it possible to store and regenerate a desired waveform part in the max. detailed manner, by successively altering each sampling clock to a sampling clock having frequency of two times the original one when the memory content of a memory circuit is insufficient with respect to an observation waveform. CONSTITUTION:When the part of a period Tl wherein the C1-point of a signal 7 is set to a start point and the C2-point thereof is set to a finish point is sampled, N-many data corresponding to memory capacity N are sampled by the sampling clock train of the highest speed cycle t0 possessed by an apparatus. In a case not reaching the C2-point at the finish time of the period Tl until N data are sampled, sampling is performed at a cycle t1=2t0. In a case not reaching the C2-point at the finish time of the period Tl even by said sampling, sampling is performed at a sampling clock having a cycle t2=2t1. Hereinafter, when the cycle of the sampling clock is altered, the cycle is made twice the previous cycle in the same way and, in a case exceeding the C2-point at the finish point of time of sampling, said sampling operation is finished. By the above-mentioned procedure, sampling can be performed in such a state that the C2-point is present in the latter half of memory capacity.