Time delayed digital video system using concurrent recording and playback
US5371551A · kind A · utility
Inventors
Key dates
| Filing date | Oct 29, 1992 |
| Grant date | Dec 6, 1994 |
| Priority date | — |
| Expiry date | Oct 29, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4147
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A broadcast recording and playback device employing a "circular buffer" which constantly records one or more incoming audio or video program signals and a microprocessor for accessing the memory to read a playback signal from the circular buffer to display programming material delayed from its receipt by a selectable delay interval. The circular buffer is implemented by a digital memory. Subsystem comprising the combination of a semiconductor RAM memory and a disk memory operated under the control of a microprocessor such that incoming signals are constantly recorded as received while, at the same time, delayed signals are being read from the memory subsystem at a different memory location selected by a microprocessor to provide a user-selected time delay. A plurality of input signal processors provides one or more programming signals to the memory subsystem in compressed digital form and a separate output signal processor converts the compressed digital information read from the memory into a form suitable for display. The audio/video buffer system operates under the control of a microprocessor which accepts commands from a remote command device or a connected host computer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.