| 摘要 |
Apparatus is disclosed for data compression by a decreasing slope threshold test using digital techniques in which the data stream through an input register is examined and only those samples of the raw data are selected for transmission which have a first difference (slope) that exceeds an exponentially decaying threshold function relative to a bias. If a sample is transmitted, it becomes the new bias and a generator of the threshold function is reset. For threshold comparison, the bias is first subtracted from each first difference to produce a second difference for direct comparison of its absolute value with the absolute value of the threshold function, thereby allowing the function generator to run from a constant reference to generate a single sided exponentially decaying function.
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