04792864 is referenced by 39 patents and cites 17 patents.

A system is disclosed for detecting the recording data of a video tape recorder, which is enabled to detect data concerning the time and channel a program played back was recorded at and through, by adding both calendar data such as the date and time and channel data indicating a channel to be recorded in the recording operation of the video tape recorder and by extracting the above-specified data in the playback operation.

Title
Apparatus for detecting recorded data in a video tape recorder for audience rating purposes
Application Number
6/879800
Publication Number
4792864
Application Date
June 27, 1986
Publication Date
December 20, 1988
Inventor
Yoshikazu Itoh
Tokyo
JP
Fumio Watanabe
Zama
JP
Agent
Roberts Spiecens & Cohen
Assignee
Video Research
JP
IPC
H04N 7/10
H04N 5/91
H04N 5/782
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