Mathematical function-generating device for electronic musical instruments
US5060179A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1989 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Nov 14, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/0335
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.