Variable speed film transport interlock system
US4933881A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 13, 1989 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Jan 13, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B31/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable speed film transport interlock control system for allowing a plurality of film audio elements to be run in synchronization with each other with at least one film element running at a different selected speed than the other elements and permitting internal generation of quadrature control signals by an internal microprocessor. The system generates a modified drive signal from a selected standard system drive signal or microcomputer generated signal such that the modified signal corresponds to a speed with a fixed ratio to the speed of the selected unprocessed drive signal under all operating conditions. This permits the modified signal to drive a film transport device, such as a recorder or reproducer, at a different speed than other transport devices while maintaining synchronization with the other devices during forward or reverse, stopping and starting, high speed or low speed operation. In addition, the internal generation of quadrature signals enables the system operator to independently advance or reverse film transport devices to permit searching for a preselected cue point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.