Interface apparatus employing a video tape drive to back-up a disc drive and including error detecting and correcting circuitry
US4380047A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1980 |
| Grant date | Apr 12, 1983 |
| Priority date | — |
| Expiry date | Nov 24, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/765
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An interface apparatus between a video tape recorder and a disc drive having a non-removable magnetic storage medium and a controller is disclosed. The video tape recorder provides memory back-up to data stored on the disc drive. The interface apparatus comprises a data bus for transferring the data between a shift register in the interface to the controller of the disc drive. The shift register transforms the parallel data from the controller to serial data when data is being written onto the VTR, and transforms the serial data from the VTR to parallel format when data is being read into the disc drive. The interface appartus has a clock for generating video signals. In addition, a circuit separates the sync and data portions of the video signal when the video signal is read from the tape of the VTR into the controller. A CRC generator checks for errors in the transmission of data to and from the video tape recorder. A control state machine which is responsive to the read/write signal from the controller generates a start bit, a data clock and shift signal to shift the shift register in its appropriate timing. The start bit is used when data is being written from the disc drive to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.