METHOD AND DEVICE FOR DTMF WIRELESS HANDSET BASED TEXT MESSAGING
First Claim
1. A method for communicating a text message between wireless communications devices, the method comprising:
- selecting at least a text character with a first communications device;
transmitting a series of dual tone multi-frequency (DTMF) tones corresponded to the selected character by a predetermined character encoding scheme from the first communications device to a second communications device through radio transmission;
correlating the series of DTMF tones received at the second communications device to the selected character referencing the predetermined character encoding scheme; and
displaying the selected character on a display device of the second communications device.
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Accused Products
Abstract
A method includes first selecting a text character with a first mobile phone, and then transmitting via radio a series of dual tone multi-frequency (DTMF) tones corresponding to the selected character from the first mobile phone to a second mobile phone. At the second mobile phone, the method includes correlating the series of received DTMF tones to the selected character, and displaying the selected character on a display device. A DTMF decoder is used to correlate DTMF tones to text character referencing a character encoding scheme stored in the first and second mobile phones. The method allows quick and reliable text messaging through DTMF tone signals over a voice channel.
23 Citations
15 Claims
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1. A method for communicating a text message between wireless communications devices, the method comprising:
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selecting at least a text character with a first communications device;
transmitting a series of dual tone multi-frequency (DTMF) tones corresponded to the selected character by a predetermined character encoding scheme from the first communications device to a second communications device through radio transmission;
correlating the series of DTMF tones received at the second communications device to the selected character referencing the predetermined character encoding scheme; and
displaying the selected character on a display device of the second communications device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A communications device capable of sending and receiving text messages comprising:
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an input device for accepting input of text characters;
a dual tone multi-frequency (DTMF) encoder connected to the input device for generating a series of DTMF tones according to at least a character and a predetermined character encoding scheme;
a radio transmitter connected to the DTMF encoder for modulating the series of DTMF tones into a radio signal and transmitting the radio signal to another communications device;
a radio receiver for receiving other radio signals from other communications devices and demodulating DTMF tones from the other radio signals;
a DTMF decoder connected to the radio receiver for decoding the DTMF tones into characters according to the predetermined character encoding scheme; and
a display device connected to the DTMF decoder for displaying the decoded characters. - View Dependent Claims (11, 14, 15)
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- 12. The communications device of claim 111 wherein the microcontroller is capable of responding to control commands decoded by the DTMF decoder, said commands being encoded as DTMF tones and stored in the predetermined character encoding scheme.
Specification