To provide a fare receipt signal generator that can connect a public phone to a general telephone line interface.
Relay circuits RL-1, RL-2, RL-3 are sequentially connected between terminals Aa, Ab and Ba, Bb in a fare containing signal generator 121 in this sequence and connected to relay drivers 521a-521f via gate circuits 522a-522c respectively. A speech start detection circuit 501 is connected to the terminals Aa, Ab to connect an output of the speech start detection circuit 501 to reply receipt signal timer circuit 502, 503 and a communication state receipt signal generating circuit 504. The speech start detection circuit 501 and the reply receipt signal timer circuits 502, 503 are connected to the relay drivers 521a-521f directly or via integration circuits 511, 512.
ORUI SHINICHI
SHOJI KATSUO
IWATSUKI KATSUHIKO
