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US 5,144,676 AGranted
Digital sampling instrument
AssigneeE-mu Systems, Inc.
InventorDavid P. Rossum
Life of this patent
Estimating the term…
Abstract
A digital sampling instrument is disclosed. The instrument provides the capability of accessing and outputting stored digital data within a single clock cycle. The instrument also provides improved volume scaling for sound generation and further eliminates redundant loading of a particular sound into a sound memory.
Claims7
A digital sampling keyboard instrument having a plurality of channels of operation for encoding digital data samples having a certain number of bits representative of a particular musical sound having a first fidelity comprising:
- means for approximating said digital data samples for each of said channels of operation, said means for approximating including
- means for creating differences between successive ones of said digital data samples,
- means for creating the logarithm of said differences to form compressed logarithmic differential data which is compressed to a fewer number of bits than said certain number of bits,
- memory means for storing said compressed logarithmic differential data,
- means for adding time varying logarithmic encoded volume coefficients to said stored compressed logarithmic differential data to form added compressed logarithmic differential data,
- means for creating the anti-logarithm of said added compressed logarithmic differential data, and
- means for creating volume scaled data samples from said anti-logarithm which approximate said digital data samples while maintaining fidelity similar to said first fidelity.
4 more elements
Dependencies are inferred from the claim text.