Mobile terminal device, storage medium and sound output control method

A storage medium holding a computer program for a mobile terminal device comprising:

• a housing;
• and a telephone communication speaker which outputs sounds during telephone communications, the telephone communication speaker including:
• a first speaker which releases sound waves corresponding to sounds to be output and vibration waves generated by vibrations of one surface of the housing according to vibrations corresponding to the sounds to be output, thereby to transfer the sounds;
• and a second speaker which releases sound waves corresponding to sounds to be output, wherein
• the computer program provides a computer of the mobile terminal device with a function to, in case of execution of a function to output sounds from the telephone communication speaker, when a predetermined trigger action is not made, execute first control in which the first speaker outputs sounds but the second speaker does not output sounds, and when the trigger action is made, execute second control in which at least the second speaker outputs sounds.

A sound output control method for a mobile terminal device comprising:

• a housing;
• and a telephone communication speaker which outputs sounds during telephone communications, the telephone communication speaker including:
• a first speaker which releases sound waves corresponding to sounds to be output and vibration waves generated by vibrations of one surface of the housing according to vibrations corresponding to the sounds to be output, thereby to transfer the sounds;
• and a second speaker which releases sound waves corresponding to sounds to be output, wherein
• the method comprises the steps of:
• executing a function to output sounds from the telephone communication speaker;
• and
• in case of execution of the function, when a predetermined trigger action is not made, executing first control in which the first speaker outputs sounds but the second speaker does not output sounds, and when the trigger action is made, executing second control in which at least the second speaker outputs sounds.