16 Feb What is the difference between active sound and actual exhaust sound?

The actual exhaust sound consists of the explosion sound and friction sound generated during the combustion process of the engine. These explosions and friction produce exhaust sound at the rear end of the exhaust pipe. Depending on the various driving conditions of the vehicle, the exhaust sound of the corresponding engine is generated. On the other hand, active sound uses variables related to engine operation to generate exhaust sound that meets the relevant conditions, and at this time, it is generated through one or two speakers that produce sound.

One of the methods often used when developing an active sound source is to record the actual exhaust sound. In this recording process, it is quite difficult to obtain a pure exhaust sound because of the distortion during the signal change process between the original sound and the recording device, and the simultaneous recording of noise except for the exhaust sound, and technical difficulties in removing these noises.

There is a way to artificially create the exhaust sound instead of this method, which is also a very difficult task. In other words, it can be seen as similar to the method of making a person’s voice as it is. There are fundamental sonic and timbre differences that come from these parts. Additionally, the engine exhaust sound is the sound from the exhaust pipe or muffler.

It is difficult to make with one or two speakers in various areas such as the mechanical component of the muffler, direction, and sound pressure.

Despite these limitations, we are trying to make a more advanced exhaust sound by constantly striving and researching.

Nevertheless, the active sound can overcome the limitations of the prescribed exhaust sound of an internal combustion engine. You can make a popcorn sound for engines that do not have a popcorn sound, and you can apply a V8 sound to a vehicle with a general engine that is not a large displacement engine such as a V8 engine.

In addition, in the case of electric vehicles, it is possible to create a sound that is closer to and suitable for electric vehicles. This active sound has many advantages and potential.