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    • 7. 发明专利
    • CREDIT CALL SYSTEM
    • JPH01240063A
    • 1989-09-25
    • JP6750988
    • 1988-03-22
    • NIPPON TELEGRAPH & TELEPHONE
    • HANAOKA HIDEAKIOKAMURA SEIICHIYUMOTO SHIZUO
    • H04M15/00H04M15/10
    • PURPOSE:To use a public telephone even when a user has neither a coin nor a telephone card by requesting the input of the telephone number of a connection destination and connecting to the connection destination when a secret number and a credit number by a dial signal from a transmitting person coincide with another secret number and another credit number from a data input device. CONSTITUTION:When the user picks up the receiver of a public telephone set 21, voice guidance is sent from the voice part of a secret number collating/voice responding circuit 24 existing in a memory station 23. The user inputs the secret number, the credit number, etc., as a push-button signal. The collating part of the secret number collating/voice responding circuit 24 collates the inputted push-button signal with the secret number registered in the registering part of a memory 30 and requests the user to input the credit number by the next voice guidance when the inputted push-button signal coincides with the registered secret number. When the user inputs the credit number, it is confirmed whether the credit number is already registered or not by the collating part, and a channel is switched to another channel 27 of an exchange 26 by a channel change-over switch 25.
    • 8. 发明专利
    • INCOMING DISPLAY DEVICE FOR TELEPHONE SET
    • JPH01261053A
    • 1989-10-18
    • JP8961188
    • 1988-04-12
    • NIPPON TELEGRAPH & TELEPHONE
    • HANAOKA HIDEAKI
    • H04M1/00
    • PURPOSE:To prevent the transmission of a call signal to a telephone set during leading time of the device by using a call signal detection and speech block means provided to the 1st stage of the device so as to detect a call signal and inserting a brake circuit to a telephone set jumper by the information. CONSTITUTION:When a polarity inversion detection section 2 detects the inversion of a telephone line 1, a switch of a power supply switch section 5 is turned on through a control line 10, a current is supplied to a call signal display section 3 from a power supply section 4, while the polarity inversion detection section 2 activates a line interruption section 8 to disconnect the telephone line 1. The operation of the line interruption section 8 is delayed momentarily, but the telephone line 1 is cut off temporarily by a relay of one-shot operation by a call signal detection and speech block circuit section 9 to inhibit the transmission of a call signal. When the telephone set 6 replies, a telephone set reply detection section 7 sends a reply signal to the polarity inversion detection section 2 restores the switch of the power supply switch section 5 and restores the line interruption section 8. Thus, the transmission of a call signal to the telephone set is prevented during the leading time of the device.