Abstract: Each doorway or passageway between rooms in which a device may be located is fitted with another device which detects motion and the direction of the motion through the passage. Each room is equipped with a signal emitter that is controlled by the motion detector at the room's passage. The signal emitted by the signal emitter is received by a monitor which monitors the status of the device which happens to be located in that room. The emitted signal informs the monitor when there has been motion into the room (audience increase) or when there has been motion out of the room (audience decrease). Motion between rooms will result in a decrease signal being sent by the signal emitter in one room and an increase signal being sent by the signal emitter in the other room. If no device and monitor are located in a room, the increase or decrease signal is ignored by the audience monitoring system.

Abstract: A meter for passively logging the presence of TV viewers including circuitry for disabling the audio of a TV set, a transmitter for wirelessly transmitting the audio to a plurality of headphones, a circuit responsive to the headphones presence upon the head of a viewer for transmitting a headphone ID signal to a monitor, a receiver in the monitor for logging the fact that particular headphones are activated, and a time of day clock for logging the period of time particular headphones are activated.

Abstract: A channel identifying rolling bar code, transmitted with a television broadcast signal, is displayed at a selected location on the receiving television screen. An apparatus is secured to the television set to view the rolling bar code to identify the channel being transmitted and process that information as necessary to detect the periods of time that different channels are received by the particular set. That information is stored in an internal memory for eventual use by a central processor.