US PATENT SUBCLASS 348 / 2
.~ Monitoring of physical reaction of viewer

Current as of: June, 1999
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348 /   HD   TELEVISION

1  DF  USE SURVEY AND ACCOUNTING {4}
2.~ Monitoring of physical reaction of viewer

DEFINITION

Classification: 348/2

Monitoring of physical reaction of viewer:

(under subclass 1) Subject matter including a device to sense the presence or movement of a viewer.

(1) Note. For example, the device detects the presence or absence of a viewer in a room, or determine whether or not the viewer eyes are watching a television program, etc.