| 摘要 |
PURPOSE:To reverse the polarity of a connection detection signal from a subscription television receiving part linked to the timer of a coin timer part and to receive the subscription television program by detecting the reverse signals. CONSTITUTION:A subscription television reception part 11 provided with a tuner 13 receiving a subscription television signal and a descrambler 15 enables the reception of subscription television signals by outputting a detection signal (a) detecting the turning on and off of a coin timer switch, reversing the polarity of the output signal by a coin timer part 12 only when turning on the coin timer switch to be returned to the toll television reception part, and deciding the polarity of the signal by a microcomputer 16 of the subscription television reception part. The coin timer part 12 consists of a coin detecting device 20 deciding the coin detection, a timer 21 linked to the device 20, a switch part 22 switching the output of a power supply 19 according to the timer output, and a reverse part 23 reversing the polarity of the detection signal (a) according to the switch output. |
