Controlling system and method for audio or video units
US5420724A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1994 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Feb 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A computer is connected to VTR units and a CRT monitor through lines. Each of the computer and the units to be controlled thereby is provided with a clock means for sharing the same time. The computer sends to the VTR unit a command for releasing record pause state and starting the record operation at time T1. After the VTR unit started the record operation, when the counter value became x, the VTR unit sends time Tx to the computer. The computer computes formula EQU D=Tx-T1-x so as to obtain delay time D. In determining the present tape position of the VTR, the computer obtains data of counter value Pc and time Tc from the VTR, and assigns the present tape position Pn of the VTR using the formula EQU Pn=Pc+(Tn-Tc), where Tn is the time at which the controller receives the signal from the VTR.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.