Electronic musical instrument with exponential keyboard and voltage controlled oscillator
US3991645A · kind A · utility
7Cited by
11References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1975 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Jun 14, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S84/20
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An electronic musical instrument includes an oscillator for generating a signal at a frequency corresponding to that associated with a depressed key of the keyboard. The key selects a control voltage, from an exponential voltage divider, for controlling the frequency of a voltage controlled oscillator, which produces a frequency which is directly proportional to the control voltage and inversely proportional to a reference voltage. The reference voltage compensates for variations in the level of the supply voltage, so that the oscillator frequency is independent of the supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.