05371551 is referenced by 560 patents and cites 11 patents.

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.

Title
Time delayed digital video system using concurrent recording and playback
Application Number
7/968439
Publication Number
5371551
Application Date
October 29, 1992
Publication Date
December 6, 1994
Inventor
Daniel Goessling
43 Davelin Rd., Wayland, 01778
MA, US
James Logan
81 Castle Hill Rd., Windham, 03087
NH, US
Agent
Allegretti & Witcoff
IPC
H04N 5/14
View Original Source