RNC technology from Acoutec has several technical features:
- Adaptive algorithm；
- High robustness, no pop sound while shock noise happening；
- High rate of convergence;
- Integrated sensor signal condition circuit in controller;
- Wide ANC control frequency range, up to 350 Hz;
- Performance of RNC has gotten OEMs recognition.
Why we need RNC?
Typical noise composition of traditional vehicles
Typical relationship between noise and frequency of traditional vehicles
Conclusion 1: Road noise is an important part of vehicle noise, and its frequency distribution is very wide.
Acoustic package control effect on road noise
Conclusion 2: The acoustic package can isolate noise above 300Hz, but has no obvious effect below 300Hz. RNC can effectively eliminate low-frequency road noise (70-350Hz), which can solve the sound quality problems such as rumble, tire drumming, and hum.
RNC System Composition
The composition of a typical noise reduction system in automotive application
Part 1: Vehicle Information Recognition
The information of the vehicle is read via the CAN bus. For auxiliary control of the noise reduction algorithm.
Part 2: In-vehicle acoustic environment monitoring
The module is responsible for the noise data of the real-time vehicle passenger compartment, converting the sound signal into an electrical signal and sending it to the DSP for processing. The controller has a built-in signal conditioning module (noise reduction, amplification processing).
Part 3: Vehicle Body Vibration Monitoring
The controller has a built-in signal conditioning module (noise reduction, amplification processing).
Part 4: Active Noise Control System
The control system is responsible for calculating and synthesizing the in-vehicle acoustic environment data and the vehicle body vibration data in real time as data that can offset the ambient noise of the vehicle according to the collected CAN signal, and sounds through the car speaker to achieve the effect of noise elimination.
RNC Controller Framework
