| 摘要 |
In an electronic memory unit for processing a pair of transient electrical signals prior to recording by an XY plotter, a random access memory receives digitized samples of the signals at a dynamically variable rate which is determined by the rate of change of the input signals. The said rate is controlled by sampling decision circuits which sense the difference in level between successive samples. The stored samples are read out of the memory to digital-to-analogue converters at a rate which is suited to the characteristics of the XY plotter connected to the outputs of the unit thereby enabling rapidly changing signals fed to the inputs of the unit to be recorded accurately without wasteful use of memory capacity.
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