Engine Harmonic Cancellation

Reduce engine noise, and trade-offs

Engine Harmonic Cancellation is an adaptive technology that reduces noise in the car cabin by creating a noise cancellation signal to counteract the sound of rotating sources such as engines, propeller shafts, and electric motors.

It is programmed to identify and cut out targeted harmonics, so drivers only hear the most pleasant engine sounds.

But EHC is about reducing more than just engine noise. It also allows carmakers to reduce the trade-offs typically needed in the car design process. This means engineers can minimize compromises and maximize performance.

Similar to other Bose ASM technologies, Engine Harmonic Cancellation is a lightweight, electronic solution. It reduces low frequency noise in the cabin without the drawbacks of traditional mechanical solutions, which can add significant mass, reduce fuel economy, or adversely affect emissions.

Because every engine and cabin is different, Bose Systems Engineers tune the EHC algorithm for each vehicle variation – cabin interior, powertrain, and exhaust– to account for differences in the cabin acoustics and baseline noise.