Digital sampling instrument employing cache-memory
AssigneeE-mu Systems, Inc.
InventorDavid P. Rossum
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Abstract
A digital sampling instrument for multi-channel interpolatative playback of digital audio data stored in a waveform memory provides improved interpolation of musical sounds by use of a cache memory. The present invention includes a plurality of interpolator circuits utilizing a single waveform memory where each of the interpolator circuits produces a unique bus request signal which is responsive to a unique bus acknowledge signal to determine which of the interpolator circuits has control of the waveform memory at any given waveform memory cycle.
Claims11
A digital sampling instrument for the multichannel Nth order interpolative playback as output samples of digital audio data samples stored in a waveform memory comprising:
- coefficient logic means for generating N coefficients for each channel for each of said output samples,
- cache memory means for storing at least n waveform memory data samples for each channel,
- convolution means for computing a sum of N products of the contents of said cache memory means times said coefficients for each of several ones of said channels, and
- means for outputting said sum of products for each of said channels.
Dependencies are inferred from the claim text.