Automotive ANC sensors reduce road noise

January 28, 2021 //By Rich Pell
Automotive ANC sensors reduce road noise
Connectors and interconnect components supplier Molex has introduced an accelerometer-based Road Noise Cancelling (RNC) sensor, the first product in a new family of automotive Active Noise Cancellation (ANC) sensors.

Commonly associated with high-end headphones, ANC technology, says the company, transforms how car manufacturers address road-based noises. Instead of installing expensive and heavy sound-absorbing materials to insulate car interiors from excessive road noise, ANC sensors are designed to be installed on a car's chassis for more accurate and efficient results, however, devices mounted to wheel wells and car frames must be built to withstand the harshest conditions.

Its ANC sensors, says the company, will play a critical role in combating unwanted road, wind, and HVAC car noise while reducing low-frequency sounds that increase driver fatigue.

"As the transition to electrified vehicles intensifies, it will become critical to reduce road noise, which today is masked by internal combustion engines," says Carrieanne Piccard, VP and General Manager, Transportation Solutions Business Unit, Molex. "Our long history in the automotive industry uniquely positions Molex to develop powerful, durable sensor technology that captures and cancels road noises while enabling safe and enjoyable driving experiences."

The company's family of ANC accelerometer and microphone sensors use Analog Devices ' Automotive Audio Bus (A2B) technology to ensure delivery of high-fidelity audio while significantly reducing cabling complexity, costs, and weight. By pairing its sensors with the A2B network, says the company, it transmits noise signals to the processing unit in less than two milliseconds.

The sensors include integral connectors and are daisy chained to simplify integration while providing up to a 30% reduction in cable weight. Derived from the company's Mini50 Connector family, the connectors offer up to 50% space savings over traditional USCAR 0.64 connectors.

The sensors are also available in different housings, including an IP6K9K enclosure, to ensure greater protection from harsh conditions while enabling placement closest to the road noise. Detecting the sound at its source speeds processing of the noise-canceling signal; A2B technology also allows a higher number of signals per chain to be processed.

Unlike other products on the market, says the company, its


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