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Noise Cancellation for Cars

Audio & Voice DSPs

Silentium & AKM Road Noise Cancellation Solutions

Road Noise Cancellation technology reduces the noise that is generated by road-induced vibrations. This is performed by composing a secondary sound field using acceleration signals as inputs and processing these signals in real-time with low-latency computational efforts.

AKM’s low-latency ADCs enable fast signal transmission to the AKM DSPs that host the Silentium Road Noise Cancellation libraries. As a result,

the total combined SW/HW system becomes a unique solution for low-latency automotive ANC applications.

Physical & Control path for Road noise cancellation for cars

Physical & Control path for Road noise cancellation for cars Physical & Control path for Road noise cancellation for cars

Low latency is essential for high-performance road noise cancellation

Silentium’s and AKM’s solution optimizes the control signal path from the acceleration sensors to the loudspeakers in order to achieve high-speed transmission of vehicle signals and low-latency algorithm processing.

This is performed by optimizing specific parts of the AKM ADCs so that the measured vehicle signals are quickly sent into the AKM DSP unit, where the Silentium low-latency algorithm software is hosted. Additional reductions in latency can come from the vehicle acoustics side with the use of near-field loudspeakers in the headrest or at other locations in close proximity to the passenger’s head. Since the hardware, software, and acoustic domains are all comprised of low-latency paths, this solution delivers in-vehicle broadband noise cancellation performance comparable to the premium noise-cancelling headphone experience.