Mobile communication terminal supporting TTY device for hard-of-hearing or speech-disabled person and communication method thereof

1. A mobile communication terminal supporting a teletypewriter (TTY) device for a hard-of-hearing or speech-disabled user, comprising:

a controller activating a vocoder corresponding to a TTY mode selected by a user;

a vocoder encoding a Baudot tone received from the TTY device into a voice data packet based on the selected TTY mode;

a TTY mode processor including TTY mode information selected by a user in part of the voice data packet; and

an RF transmitter transmitting an encoded voice data packet including the TTY mode information.

2. A mobile communication terminal supporting a TTY device for a hard-of-hearing or speech-disabled user, comprising:

an RF receiver receiving an encoded voice data packet including TTY mode information selected by a user;

a TTY mode processor extracting the selected TTY mode information from the received voice data packet to determine a TTY mode on a receiver side that corresponds to the TTY mode information;

a controller activating a vocoder corresponding to the determined TTY mode on the receiver side; and

a vocoder decoding the received voice data packet into a Baudot tone, which can be processed in the TTY device, based on the determined TTY mode.

3. The mobile communication terminal of claim 1 , wherein the selected TTY mode information is recorded on two bits of a reserved area of the voice data packet.

4. The mobile communication terminal of claim 2 , wherein the selected TTY mode information is recorded on two bits of a reserved area of the voice data packet.

5. The mobile communication terminal of claim 1 , wherein the selected TTY mode information is a TTY disable mode in which a TTY function is not used, a TTY VCO mode in which voice is sent and a Baudot tone is received, a TTY HCO mode in which a Baudot tone is sent and voice is received, or a TTY Full mode in which a Baudot tone is sent and received.

6. The mobile communication terminal of claim 2 , wherein the selected TTY mode information is a TTY disable mode in which a TTY function is not used, a TTY VCO mode in which voice is sent and a Baudot tone is received, a TTY HCO mode in which a Baudot tone is sent and voice is received, or a TTY Full mode in which a Baudot tone is sent and received.

7. The mobile communication terminal of claim 1 , wherein the Baudot tone is transmitted and received through the TTY device and audio path (ear jack).

8. The mobile communication terminal of claim 2 , wherein the Baudot tone is transmitted and received through the TTY device and audio path (ear jack).

9. The mobile communication terminal of claim 1 , further including a user interface allowing the hard-of-hearing or speech-disabled user to select a desired TTY mode.

10. The mobile communication terminal of claim 2 , further including a user interface allowing the hard-of-hearing or speech-disabled user to select a desired TTY mode.

11. The mobile communication terminal of claim 1 , further including a display processor displaying the selected TTY mode information or the determined TTY mode information on the receiver side.

12. The mobile communication terminal of claim 2 , further including a display processor displaying the selected TTY mode information or the determined TTY mode information on the receiver side.

13. A communication method of a mobile communication terminal supporting a TTY device for a hard-of-hearing or speech-disabled user, comprising:

activating a vocoder corresponding to a TTY mode selected by a user;

encoding a Baudot tone received from the TTY device into a voice data packet based on the selected TTY mode;

including TTY mode information selected by a user in part of the voice data packet; and

transmitting an encoded voice data packet including the TTY mode information.

14. A communication method of a mobile communication terminal supporting a TTY device for a hard-of-hearing or speech-disabled user, comprising:

receiving an encoded voice data packet including TTY mode information selected by a user;

extracting the TTY mode information from the received voice data packet to determine a TTY mode on a receiver side that corresponds to the TTY mode information;

activating a vocoder corresponding to the determined TTY mode;

decoding the received voice data packet into a Baudot tone, which can be processed in the TTY device, based on the determined TTY mode; and

transmitting the Baudot tone to the TTY device.

15. The communication method of claim 13 , further including displaying the selected TTY mode information and the determined TTY mode information on a display unit.

16. The communication method of claim 14 , further including displaying the selected TTY mode information and the determined TTY mode information on a display unit.

17. The communication method of claim 13 , wherein the selected TTY mode information is recorded on two bits of a reserved area of the voice data packet.

18. The communication method of claim 14 , wherein the selected TTY mode information is recorded on two bits of a reserved area of the voice data packet.

19. The communication method of claim 13 , wherein the selected TTY mode information is a TTY disable mode in which a TTY function is not used, a TTY VCO mode in which voice is sent and a Baudot tone is received, a TTY HCO mode in which a Baudot tone is sent and voice is received, or a TTY Full mode in which a Baudot tone is sent and received.

20. The communication method of claim 14 , wherein the selected TTY mode information is a TTY disable mode in which a TTY function is not used, a TTY VCO mode in which voice is sent and a Baudot tone is received, a TTY HCO mode in which a Baudot tone is sent and voice is received, or a TTY Full mode in which a Baudot tone is sent and received.