| 摘要 |
A communication terminal device carries out data processing based on key or touch panel operations and provides a telephone conversation function. When a key is actuated, a key input confirmation sound is generated. When data input is performed on the touch panel with a pen, a pen impact sound caused by striking the touch panel with the pen and a pen frictional sound caused by rubbing the touch panel with the pen are generated. In the telephone conversation mode, the key input confirmation sound, the pen impact sound, and the pen frictional sound are picked up as noises by the microphone. Upon detecting such noises, the communication terminal device generates noise and cancelling signals corresponding to the respective noises and cancels each noise from a voice signal input form the microphone. Thus, a voice signal free from noises is transmitted.
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