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Percept Road Noise Cancelling Sensors

Improving the driving experience and enhancing passenger comfort and safety by reducing unwanted road noise, Percept Road Noise Cancelling (RNC) Sensors from Molex deliver real-time monitoring capabilities that enable the vehicle to dynamically adapt to changing conditions for optimal noise reduction.

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Distortion  Monitored Frequency Bandwidth  Noise Floor  Operating Temperature
Max. Monitored Shock Load +/- 16 g 4,000 Hz <70 μg/√Hz  -40 to +115°C

Percept Road Noise Cancelling (RNC) Sensor Assembly

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Features and Benefits

Quiet cabins are key to a relaxing, enjoyable driving experience, but as the transition to electric vehicles accelerates, internal combustion engines can no longer be relied upon to mask road noise. Quiet powertrains can make noise such as tires rolling on the road surface more prominent and distracting. These low-frequency sounds also increase driver fatigue, impacting safety.

Effective noise reduction in the vehicle cabin is essential for meeting regulatory noise standards and enhancing customer satisfaction, but using insulating materials to address this problem can significantly increase vehicle weight and affect design flexibility. A lighter-weight, space-saving alternative is active noise cancellation.

State-of-the-art Percept RNC Sensors from Molex help enable high-precision noise cancellation that dynamically adjusts to driving scenarios in real time, thereby enabling the vehicle sound system to maintain consistent cabin comfort and optimal safety. Percept RNC Sensors are designed with compatibility and integration in mind. Their compact, lightweight and robust design is easy to fit into vehicle architectures and daisy-chain wiring streamlines integration with other systems in the vehicle.

Simplified Wiring

Traditional vehicle wiring uses a star-pattern cable harness design which requires more installation time and materials, increasing manufacturing costs and vehicle weight. The Percept RNC Sensor uses a daisy-chained wiring design that significantly simplifies cabling to reduce vehicle weight, resulting in improved efficiency and manufacturability. This wiring solution also eases maintenance, enhances design flexibility and supports the streamlined integration of new technology.

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Low Latency for Rapid Response

Effective noise cancelling requires nearly instantaneous response times to enable the vehicle to adapt quickly to varying road conditions. Percept RNC Sensors deliver a response time of less than 150 microseconds, permitting the rapid detection and analysis of road noise so the system can generate precise cancellation waveforms in real time. This helps ensure consistent cabin comfort across various driving conditions while meeting stringent noise standards and affording greater market differentiation. 

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Robust Design for Harsh Conditions

Automotive sensors face harsh conditions, from water and dust to extreme temperatures and vibration. Percept RNC Sensors have IP6K9K-rated enclosures for resistance to dust or water ingress and are designed for long-term reliability in challenging conditions. This ruggedness enables designers to place sensors in a wide range of chassis locations, increasing design flexibility and simplifying installation.

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Permits low latency and results in less time between the sensor receiving vibrations and the module receiving a notification signal
A2B digital communication protocol

Reduces the harness weight of the vehicle and eliminates heavy star-pattern cabling
Daisy-chained sensor design

Enables the sensor to be placed where needed, protecting against water and dust ingress in harsh environments such as adjacent to the tire
IP6K9K rating

Allows for a cleaner signal, leading to improved system efficiency
Superior packaging design

Features high sensitivity to energy sources, allowing sensor placement farther from the energy source if required
Low noise density excitation

Offers flexibility for parallel or perpendicular sensor positioning relative to the ground to enable mechanical mounting to a vehicle and permit a variety of connector orientations and terminal sizes
Various mechanical housing configurations available

Provides 50% space savings over traditional USCAR 0.64mm connectors and delivers superior signal integrity performance ideal for transportation environments
Exterior sensors mate with 1x4 sealed Mini50 connectors

Provides superior electrical contact reliability, mating retention and space savings compared to competitive versions for high-vibration and high-temperature applications
Interior sensors mate with 1x4 Duraclik connectors

Captures vibration energy transfer from the suspension into the vehicle chassis at the earliest perceptible time, enabling optimal timing of corrective action
4 to 8 sensors located on the chassis frame

Datasheets and Guides

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In-Cabin Noise Reduction

Introducing the Percept Road Noise Cancelling (RNC) Sensor by Molex, designed for superior performance in automotive environments. With a latency of less than 150 μs and a low noise floor, these sensors enable rapid response to road noise conditions and effective noise cancellation even at lower speeds, providing a competitive edge in sensor sensitivity and placement flexibility.

Applications by Industry

Automotive In-Cabin Applications
Electric Vehicles
Advanced driver-assistance systems (ADAS)
Automated parking sensors
Autonomous vehicles
Commercial aviation
Condition-based monitoring
Fleet and commercial vehicle monitoring
Off-highway and construction vehicles
Security/anti-vandalism systems
Train and locomotive monitoring
Vehicle diagnostics

This is not a definitive list of applications for this product. It represents some of the more common uses.

Frequently Asked Questions

What is the primary purpose of RNC sensors?
RNC sensors detect and enable the cancellation of unwanted road noise, which is particularly noticeable in electric and hybrid vehicles where engine noise is minimal. The technology significantly enhances the in-cabin experience by creating a quieter environment. RNC sensors can be utilized in any vehicle, including those with an internal combustion engine (ICE), to enhance driver and passenger comfort, therefore heightening overall enjoyment by minimizing road and engine noise.

Can RNC sensors detect road noise at lower speeds?
Yes, Percept RNC Sensors have a low noise floor, allowing them to detect low-amplitude vibrations at slower speeds. This enhances their effectiveness at lowering in-cabin noise levels across a wide range of driving conditions.

What makes Percept RNC Sensors superior to traditional noise-dampening materials?
Percept RNC Sensors use A2B audio bus technology to provide more effective and economical noise cancellation solutions when compared with traditional noise-dampening materials. Active noise cancellation and a daisy-chain wiring design reduce vehicle weight and improve results in various driving conditions, contributing to efficiency and cost-effectiveness.

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