Tone generator system for an electronic organ
US4056033A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1975 |
| Grant date | Nov 1, 1977 |
| Priority date | — |
| Expiry date | Oct 14, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H1/08
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A tone generator system for an electronic organ which is capable of being fabricated into an LSI structure and receives a saw-tooth wave or staircase wave as an input thereto comprises a frequency divider for the saw-tooth wave or staircase wave including a ladder resistor network and a complementary MOS FET devices, an analog switch having a wide dynamic range and a high linearity in input-output transfer characteristic constructed by MOS FET devices to serve as an indirect keying means, a sustain means including a novel structure of a variable impedance element which is constructed to control a channel current in a MOS FET device by varying the potential distribution in the source region, and an impedance coverter constructed by complementary MOS FET devices and free from a D.C. level shift. With the above arrangement a tone generator system of high quality for an electronic organ is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.