Vehicle sound synthesizer

A sound synthesizer for a vehicle having a driving operation detector that detects an operation amount of a driving operation input device activated by a driver, a speed calculator that calculates a revolution speed of a drive unit based on the detected operation amount, a sound controller that outputs a sound control signal based on an input of the operation amount and the revolution speed, a memory that stores drive sound data in advance, a synthesized sound output generator that outputs drive sound data from the memory and outputs a voltage signal corresponding to a sound pressure signal, wherein:

• the memory divides the operational state of the drive unit into plural stages by using the operation amount and the revolution speed as parameters, the memory storing each driving sound which is recorded in each operational period as digital data of the driving sound at a wavelength of a sound pressure waveform which is substantially the same as a cyclic sound interval of the drive unit;
• the sound controller is arranged to output sound control signals so that the drive sound data corresponding to the revolution speed and the cyclic interval of the drive unit is repetitively played;
• and
• the drive sound data with a unit of the sound pressure waveform stored in the memory is prepared at a server that is connected to the sound synthesizer through a communication line, and at the time of use, the drive sound data is transmitted to the memory from the server through the communication line.