Vibration generation system, vibration generation apparatus, storage medium having stored therein vibration signal generation program, and vibration generation method

A vibration signal generation system for generating a vibration signal from a sound signal, the vibration signal generation system comprising one or more processors configured to:

• in a frequency shift, convert sound pressure information indicated by a sound signal and belonging to a frequency range above an upper limit that enables at least a user to perceive a vibration, into sound pressure information belonging to a frequency range less than or equal to the upper limit;
• and
• generate a vibration signal using the sound pressure information after the conversion in the frequency shift;
• wherein in the frequency shift, the sound pressure information belonging to the frequency range above the upper limit is converted into sound pressure information belonging to a frequency range where a sound cannot be listened to by the user, and
• wherein in the generation of the vibration signal, the sound signal before the conversion in the frequency shift is added to the sound pressure information after the conversion in the frequency shift, thereby generating the vibration signal.

A vibration signal generation apparatus for generating a vibration signal from a sound signal, the vibration signal generation apparatus comprising one or more processors configured to:

• in a frequency shift, convert sound pressure information indicated by a sound signal and belonging to a frequency range above an upper limit which enables at least a user to perceive a vibration and at which human cutaneous sensation is received, into sound pressure information belonging to a frequency range less than or equal to the upper limit;
• and
• generate a vibration signal using the sound pressure information after the conversion in the frequency shift,
• wherein in the frequency shift, a moving maximum value in each certain moving section is extracted from waveform data of the sound signal, and using the moving maximum value, the sound pressure information belonging to the frequency range above the upper limit is converted into the sound pressure information belonging to the frequency range less than or equal to the upper limit.

A non-transitory computer-readable storage medium having stored therein a vibration signal generation program executed by a computer included in a vibration signal generation apparatus for generating a vibration signal from a sound signal, the vibration signal generation program causing the computer to execute:

• in a frequency shift, converting sound pressure information indicated by a sound signal and belonging to a frequency range above an upper limit which enables at least a user to perceive a vibration and at which human cutaneous sensation is received, into sound pressure information belonging to a frequency range less than or equal to the upper limit;
• and
• generating a vibration signal using the sound pressure information after the conversion in the frequency shift,
• wherein in the frequency shift, a moving maximum value in each certain moving section is extracted from waveform data of the sound signal, and using the moving maximum value, the sound pressure information belonging to the frequency range above the upper limit is converted into the sound pressure information belonging to the frequency range less than or equal to the upper limit.

A vibration signal generation method for generating a vibration signal from a sound signal, the vibration signal generation method comprising:

• in a frequency shift, converting sound pressure information indicated by a sound signal and belonging to a frequency range above an upper limit which enables at least a user to perceive a vibration and at which human cutaneous sensation is received, into sound pressure information belonging to a frequency range less than or equal to the upper limit;
• and
• generating a vibration signal using the sound pressure information after the conversion in the frequency shift,
• wherein in the frequency shift, a moving maximum value in each certain moving section is extracted from waveform data of the sound signal, and using the moving maximum value, the sound pressure information belonging to the frequency range above the upper limit is converted into the sound pressure information belonging to the frequency range less than or equal to the upper limit.