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Audio Signal Processing

Digital-sampling-instrument

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Digital sampling instrument

Details

Inventors: Rossum, David P.;
Assignee: E-mu Systems, Inc. (Scotts Valley, CA)
Primary Examiner: Isen; Forester W.
Assistant Examiner:
Attorney, Agent or Firm: Heller, Ehrman, White & McAuliffe

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.

DETAILED DESCRIPTION It is an object of the present invention to provide an improved digital sampling instrument.
It is another object of the present invention to provide a digital sampling instrument which has improved fidelity of the audio sound to be generated.
Briefly, the present invention provides a digital sampling instrument operating in successive clock cycles and includes memory means for storing digital sound data in a plurality of accessible locations in the memory means.
The instrument also includes means for accessing the digital sound data within a single clock cycle which is one-fourth as long as a memory cycle, and means for outputting the accessed digital data to, for example, a digital to analog converter means for generating an audio sound within the single clock cycle.
This provides a fast and accurate generation of the desired audio sound.
According to another aspect of the present invention, the instrument includes means for logarithmically encoding successive differences of digital data samples representative of a particular sound and means for accumulating differences between successive ones of the digital data samples to form PCM data.
The instrument also includes means for adding the logarithmically encoded differential data to create a volume scaled data sample, which can be suitably decoded and converted to an audio format for accurate generation of a desired sound.
According to a further aspect of the present invention, the instrument includes a first non-volatile memory means for storing a plurality of identification numbers where each of the numbers is unique to one another.
The instrument also includes second memory means for storing a plurality of different digital sound data samples where each of the different sound data samples is representative of a particular sound.
The instrument further includes control means for assigning one of the unique identification numbers with a particular one of the different sound data samples (to form "tagged" data samples) and means for storing the tagged sound data samples in the second memory means

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