| 摘要 |
PURPOSE:To allow a user to enjoy the excellent TV life of a man-machine interface by providing a timing signal multiplexing circuit which multiplexes a timing signal in the area of a voice or the area of an ID code. CONSTITUTION:A modulated signal is generated by a modulated signal generator 29 of a pilot. Moreover, this system is equipped with a modulated signal generator 34 of the pilot which generates a different modulated signal, and at the time of generating a timing signal, a switch 35 is instantaneously connected with the circuit 34. At a reception side, the transmission of the timing signal can be judged by detecting the movement of a spectrum at that time. The output of the switch 35 is amplitude-modulated by an AN modulator 30 by a pilot signal, mixed with a main voice and a sub-voice by a mixer 25, multiplexed with a voice signal by a duplexer 33, and broadcasted. At the reception side, when the plot signals of both the main voice and the sub-voice are detected even in a short time by a timing detector, that instant is recognized as a program recording start timing. |
