Importance

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Abstract

The memory needed for the digital storage of a waveform having an amplitude range of .+-.128 units is compacted by nearly 50% through the use of a 16-position table containing selected increments. Each waveform sample value is first predicted from at least two prior samples by linear prediction, and the predicted value is then incremented by the most nearly accurate increment in the table to obtain an approximation of the actual waveform value at the sample point. The appropriate increment for each sample can be defined by a 4-bit table address. The best-fit increment values for any given waveform can be calculated by a reiterative trial-and-error computation process. By the use of a best-fit table, inaccuracies in the waveform reproduction can be held below audible levels.

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First Claim