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1. EP1711024 - Apparatus and method for switching a voice codec of a mobile terminal

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Claims

1. An apparatus for switching a voice codec of a mobile communication terminal (100) in a voice call service between different types of communication systems, comprising:

a controller (120) for controlling selection of a voice codec (141, 142, 140+n) of an origination terminal (100) according to information on a type of a voice codec of a destination terminal;

a switch unit (130) for selecting one of a plurality of voice codecs (141, 142, 140+n) under the control of the controller (120); and

the plurality of voice codecs (141, 142, 140+n) for encoding/decoding a voice used in the different types of communication systems,
characterized in that

the controller (120) is adapted to transmit a call origination request for requesting information on the type of the voice codec of the destination terminal to a communication network and to receive the information on the type of the voice codec of the destination terminal from the communication network when a ring-back tone is received from the communication network,

wherein the information on the type of the voice codec of the destination terminal is only transmitted to the origination terminal.


  2. The apparatus of claim 1, further comprising:

a voice processing unit (110) adapted to PCM-convert voice data and to output the converted PCM voice data to the switch unit (130); and

a transceiver (150) connected with the plurality of voice codecs (141, 142, 140+n) and adapted to transmit and to receive encoded voice data.


  3. The apparatus of claim 1, wherein the plurality of voice codecs (141, 142, 140+n) include a QCELP (Qualcomm Code Excited Linear Prediction), an EVRC (Enhanced Variable Rate Coder), an SMV (Selectable Mode Vocoder) and an AMR (Adaptive Multi-Rate).
  4. The apparatus of claim 1, wherein the information on the type of the voice codec of the destination terminal may include a voice codec used by the destination terminal or a type of a communication system to which the destination terminal belongs.
  5. The apparatus of claim 4, wherein the communication network (200) is adapted to receive a request for voice call origination from the origination terminal (100), and to check the information on the destination terminal included in the voice call origination request and to search information on the type of the voice codec used by the destination terminal from a certain database by using the checked information on the destination terminal.
  6. A method for switching a voice codec of a mobile communication terminal in a voice call service between different types of communication systems, comprising:

requesting origination of a voice call (S100) to a communication network (200);

receiving (S120) information on a type of a voice codec of a destination terminal from the communication network (200);

determining a voice codec used by a destination terminal according to the received information on the type of the voice codec of the destination terminal;

selecting (S130) the same type of voice codec as the determined among a plurality of voice codecs (141, 142, 140+n),

encoding voice data through the selected voice codec; and

transmitting the encoded voice data to the destination terminal when the voice call is connected with the destination terminal,

wherein the information on the type of the voice codec of the destination terminal is received when a ring-back tone is received from the communication network (200).


  7. The method of claim 6, wherein the plurality of voice codecs include a QCELP (Qualcomm Code Excited Linear Prediction), an EVRC (Enhanced Variable Rate Coder), an SMV (Selectable Mode Vocoder) and an AMR (Adaptive Multi-Rate).
  8. The method of claim 6, wherein when the request for the voice call origination is received (S100), the communication network (200) checks destination terminal information included in the voice call origination request and searches (S110) information on the type of the voice codec used by the destination terminal from the database by using the checked destination terminal information.
  9. The method of claim 6, wherein the information on the type of the voice codec of the destination terminal may include a voice codec used by the destination terminal or a type of a communication system to which the destination terminal belongs.