Telephone DTMF signal accessible data processor with calculator

Details Telephone DTMF signal accessible data processor with calculator Telephone DTMF signal accessible data processor with calculator

1998-12-17

1999-09-07

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379 9318, 379 8801, H04M 1100

Patent

active

059498579

ABSTRACT:
In a data processor having an application program accessible from a DTMF telephone, a calculator program is also provided. When a user has accessed the application program by means of a DTMF telephone, the user can switch to the calculator program to carry out a calculator function by means of a hot key input, in which the user presses the star key twice. Once in the calculator program, the user can enter numbers by pressing the telephone numerical keys and enter key sequences to command mathematical operations to be performed. The user can hot key back to the application program to continue the application program at any time by again entering the hot key transfer sequence in which the user presses the star key twice.

REFERENCES:
patent: 4087635 (1978-05-01), Vasquez
patent: 4749353 (1988-06-01), Breedlove
patent: 5042063 (1991-08-01), Sakanishi et al.
patent: 5204894 (1993-04-01), Darden
patent: 5872837 (1999-02-01), Johnson

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