| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem that a user sometimes feels that sound is too loud when switching an output destination of sound signals from a built-in speaker to an external sound output device, in a portable terminal device such as a mobile phone. <P>SOLUTION: A switching part 8 outputs sound signals to one of a speaker 10 built in a device body and an external I/F part 9 corresponding to a connections state of the external I/F part 9 and an external sound output device such as an earphone. A control part 2 lowers a level of the sound signals when the output destination of the sound signals is switched from the speaker 10 to the external I/F part 9 by the switching part 8, and thereafter executes volume increasing processing of increasing the level of the sound signals by a prescribed amount each time an optional button among a plurality of buttons constituting a button input part 1 is pressed. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
