DTMF Generating assistant

Details DTMF Generating assistant DTMF Generating assistant

2007-03-27

2008-08-05

Singh, Ramnandan (Department: 2614)

Telephonic communications

Supervisory or control line signaling

Substation originated

Reexamination Certificate

active

07409055

ABSTRACT:
A DTMF generating device for automatically generating DTMF tones corresponding to a predefined phone number comprises a processor, a memory, and a speaker enveloped in a credit card sized casing. The memory has stored therein DTMF tone samples corresponding to the predefined phone number. When a user presses on a portion of the casing, the DTMF tone samples are played by the speaker.

REFERENCES:
patent: 5509056 (1996-04-01), Ericsson et al.
patent: 5700037 (1997-12-01), Keller
patent: 5748713 (1998-05-01), Kovacs, Jr.
patent: 2003/0045267 (2003-03-01), Himmel et al.

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