| 摘要 |
PROBLEM TO BE SOLVED: To simply attain a television(TV) interaction system based on bidirectional communication by generating the terminal number ID of a communicated party differently from a picture transmitting channel, executing high frequency modulation by a data channel and multiplexedly transmitting the modulated data. SOLUTION: When a call device consisting of a called party selection board 1 and a receiver 2 in the center device A is called from an opposite party or executes talking by selecting an opposite party, a called party lamp is turned on when a switch 1b on the board 1 is depressed. Since the receiver 2 is hooked off and an off-hook switch is turned in talking, the called party and a busy signal are detected. A called party signal is converted into a terminal ID number. The busy signal generates call start and end signals. The start and end signals are inputted to a transmitter/receiver 5 in a center additional device (a). The transmitter/receiver 5 is connected to a camera 4 and a monitor TV 3, connected also to a terminal equipment B through a picture line 12 and allowed to execute high frequency modulation of a camera picture only in talking and transmit the modulated signal to the terminal equipment B. |
