Sound signal generation device, sound signal generation method, and sound signal generation program

A sound signal generating method executed in a sound signal generation device comprising an operation amount data acquisition means, a running speed data acquisition means, a virtual running speed calculation means, a modification means, a virtual rotation speed calculation means, and a generation means, the method including:

• a step of acquiring, by the operation amount data acquisition means, being a processing unit comprising a central processing unit (CPU) and a memory, operation amount data indicating an accelerator operation amount in an electric vehicle on which an electric motor for vehicle driving is mounted;
• a step of acquiring, by the running speed data acquisition means, being the processing unit comprising the central processing unit (CPU) and the memory, running speed data indicating running speed of the electric vehicle;
• a step of calculating, by the virtual running speed calculation means, being the processing unit comprising the central processing unit (CPU) and the memory, a virtual running speed of a vehicle on which an engine of an internal combustion type is mounted;
• a step of modifying, by the modification means, being the processing unit comprising the central processing unit (CPU) and the memory, the calculated virtual running speed on the basis of the acquired running speed data;
• a step of calculating, by the virtual rotation speed calculation means, being the processing unit comprising the central processing unit (CPU) and the memory, a virtual rotation speed of the engine on the basis of the modified virtual running speed;
• and
• a step of generating, by the generation means, being the processing unit comprising the central processing unit (CPU) and the memory, an artificial engine sound signal indicating an artificial sound of the engine corresponding to a running state of the electric vehicle on the basis of the accelerator operation amount indicated by the acquired operation amount data and the calculated virtual rotation speed,
• wherein the virtual running speed calculation means calculates the virtual running speed by excluding an influence of a gradient of a road on which the electric vehicle moves and an influence of bra king resistance of the electric vehicle.

A non-volatile recording medium recording a sound signal generation program causing a computer to execute:

• a step of acquiring operation amount data indicating an accelerator operation amount in an electric vehicle on which an electric motor for vehicle driving is mounted;
• a step of acquiring running speed data indicating running speed of the electric vehicle;
• a step of calculating a virtual running speed of a vehicle on which an engine of an internal combustion type is mounted;
• a step of modifying the calculated virtual running speed on the basis of the acquired running speed data;
• a step of calculating a virtual rotation speed of the engine on the basis of the modified virtual running speed;
• and
• a step of generating an artificial engine sound signal indicating an artificial sound of the engine corresponding to a running state of the electric vehicle on the basis of the accelerator operation amount indicated by the acquired operation amount data and the calculated virtual rotation speed,
• wherein the virtual running speed is calculated by excluding an influence of a gradient of a road on which the electric vehicle moves and an influence of braking resistance of the electric vehicle.