Musical instrument sustainers and transducers
US4907483A · kind A · utility
Inventors
Key dates
| Filing date | May 27, 1988 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | May 27, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S84/10
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A sustainer for providing sustained sounds from a musical instrument has a feedback circuit for converting a pickup signal representing a vibration of a string or other vibratory element to a drive signal and applying drive forces to the vibratory element responsive to the drive signal. The sustainer is arranged to compensate for the phase lag of the pickup signal relative to motion of the vibratory element and to compensate for the phase lag of the drive forces provided by the driver relative to the drive signal. The feedback circuit may be arranged to provide a phase difference between the drive signal and the pickup signal such that the phase difference varies with frequency towards a drive signal leading phase difference with increasing frequency. This phase compensation provides enhanced response of the strings in the fundamental mode of vibration. The driver preferably is arranged so that the drive forces applied to the strings do not vary with lateral movement of the strings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.