Communication apparatus for use with public telephone network

Details Communication apparatus for use with public telephone network Communication apparatus for use with public telephone network

1995-03-07

1996-11-19

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 97, H04M 1100

Patent

active

055771068

ABSTRACT:
An object of the invention is to provide a communication apparatus for use with a public telephone network, capable of securely obtaining information from an information supplying terminal device. In the apparatus, a plurality of data (DTMF signals) to be transmitted to the information supplying terminal device; a standby time from the end of transmission of the data to the beginning of transmission of the subsequent data; and judgment data representing whether a voice signal from the information supplying terminal device exists after transmission of the data are stored. In the case where on the basis of the judgment data it is judged that a voice signal exists, the data D5 to be subsequently transmitted is transmitted, after the standby time means has been timed and the termination of transmission of a voice signal has been detected in a silent period. On the other hand, in the case where on the basis of the judgment data it is judged that no voice signal exists, data D2 to be subsequently transmitted is transmitted, after the standby time has been timed. Accordingly the communication apparatus is capable of securely transmitting the data corresponding to the voice signal from the information supplying terminal device and receiving the information from the information supplying terminal device.

REFERENCES:
patent: 5014296 (1991-05-01), Saigano

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