Electronic piano tone circuit
US5014587A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 1989 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Oct 16, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H5/12
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Apparatus for generating an enveloped tone signal includes a digital portion for generating an alternating logical wave form at the desired frequency, and a start pulse for initiating the tone; and an analog portion responsive to the alternating logical wave form and the start pulse for creating the tone, the analog portion including a capacitor responsive to the start pulse for storing a charge and a switching device connected to the capacitor and responsive to the alternating logical wave form for repeatedly bleeding off a portion of the charge from the capacitor in synchronization with the alternating logical wave form, and a transducer connected to the capacitor for producing the enveloped tone signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.