DTMF generating assistant

Details DTMF generating assistant DTMF generating assistant

2007-03-27

2007-03-27

Tsang, Fan (Department: 2614)

Telephonic communications

Supervisory or control line signaling

Substation originated

C379S093060, C379S093370, C379S352000, C379S372000, C379S418000, C379S419000, C379S447000

Reexamination Certificate

active

09949587

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.

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