Music activated chromatic roulette generator
US3969972A · kind A · utility
Inventor
Key dates
| Filing date | Apr 2, 1975 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Apr 2, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63J17/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for creating and displaying colored roulette curves representative of music on a screen includes an X-,Y-deflection control circuit which is driven in part by at least two musically-related fixed frequency signals. These frequencies are taken from an arithmetic progression of pseudotempered scale tones and are very nearly equal in frequency to frequencies of tones in the geometric progression of tempered scale music tones. In addition, they form a ratio of integers, one to the other, approximately equal to [N(1.0594631)n]/N, where N is an integer, n-1 is the number of tones skipped between two corresponding tones in the tempered scale, and (1.0594631)/1 is the common ratio relating adjacent tempered scale music tones as well as the common difference in various arithmetic progressions of pseudo-tempered scale tones as related to changes in musical key. These fixed frequency signals are each divided into quadrature components and, after being amplitude modulated by audio-derived music signals, applied to the X-,Y-deflection control circuits. A circuit for determining the colors of the roulette curves receives audio-derived music signals, separates these signals into various …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.