Apparatus and method for modifying a musical tone to produce celeste and other effects
US4072079A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1976 |
| Grant date | Feb 7, 1978 |
| Priority date | — |
| Expiry date | Aug 9, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H2210/321
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A signal animation system for an electric organ or other electrical musical instrument which utilizes frequency-proportional detuning wherein the percentage detuning is progressive and uniform, to provide celeste and other musical effects. Detuning is accomplished by a shift register through which sampled electrical representations of an input tone signal are shifted progressively through the register from the input to the output, which delays the signal. The trigger pulses which time the shifting function are frequency-modulated in a manner such that the period of the trigger pulses, rather than their frequency is proportional to a control voltage supplied to the trigger pulse generator. In a system for producing celeste animation, a shift register in each of two channels are controlled to progressively and uniformly phase-shift the musical signal in opposite directions simultaneously on a slow cyclical basis, and to produce abrupt reversal of the direction of phase shift of the two signals substantially simultaneously so as to provide two input signals one of which is slightly musically flat and the other slightly musically sharp for substantially identical periods at the end of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.