Dual purpose memory for time division multiplexing and time base error correction
US4785359A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1986 |
| Grant date | Nov 15, 1988 |
| Priority date | — |
| Expiry date | Oct 6, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/81
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a time division multiplex video reproducing apparatus, a dual purpose memory serves to (a) perform time compression for time division multiplexing and (b) perform as a variable delay line for time base error correction. Seemingly unavoidable conflicts in the allocation of memory space (between multiplexing operations and time base error correction operations) are eliminated by performing the time base error correction operations during a memory idle time inherent in the time division multiplexing process. As a result, time base error correction in this invention requires little additional hardware and no additional space in the memory beyond that required for time division multiplexing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.