Mathematical function-generating device for electronic musical i

Details Mathematical function-generating device for electronic musical i Mathematical function-generating device for electronic musical i

1989-11-14

1991-10-22

Harkcom, Gary V.

Boots, shoes, and leggings

84647, G06F 102

Patent

active

050601792

ABSTRACT:
A mathematical function-generating device for producing, in an electronic musical instrument, functional values from an accumulation of first digital data. A digital data-generating circuit generates first digital data. A digital value string-generating circuit generates a bit-reversed digital value which increments a predetermined amount each time a first digital data unit is generated and which corresponds to a predetermined number of least significant bits in said first digital data unit. An adder is provided for adding the first digital data to a digital value comprising an accumulated value truncated to a predetermined number of least significant bits and having the bit reversed digital data concatenated thereto, thereby producing a new accumulated value. A memory is provided for storing and truncating each new accumulated value. The memory also supplies the adder with the new accumulated value. The first digital data corresponds to gradients of a linear or exponential curve and may be used as address signals to read waveform data from a memory. The accumulated values give functional values of that curve, which may represent an envelope waveform.

REFERENCES:
patent: 4333159 (1982-06-01), Bigall et al.
patent: 4424730 (1984-01-01), Ezawa
patent: 4701871 (1987-10-01), Sasaki et al.

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