Time delayed digital video system using concurrent recording and playback
USRE36801E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1996 |
| Grant date | Aug 1, 2000 |
| Priority date | — |
| Expiry date | Apr 18, 2016 |
Classification
- Technology area (CPC —)General
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.