The rest is silence: NXP brings echo cancellation to cars

The rest is silence: NXP brings echo cancellation to cars

New Products |
By Christoph Hammerschmidt

Echo occurs when the speakers within a car transmit a voice signal from an incoming call, which subsequently ricochets through the vehicle and returns to the microphone. This causes the caller to hear their own voice, which is distracting and can result in broken communications. Additionally, road noise from other sources such as fans, exhaust, tires, windows and passengers can infiltrate calls and render them unintelligible, ultimately disrupting the driving experience and causing frustration.

The NXP ECNR solution deals with both problems by removing echoes and filtering out unwanted noise from the cockpit to enhance the sound quality of conversations. Since it can be ported to NXP chipsets and is ITU-T P1110 and CarPlay pre-certified, it can reduce carmakers’ R&D expenses and speed up the design cycle.

The solution is not entirely new: It already has been deployed worldwide in more than a billion phones and. Now the company decided to deliver this technology to its automotive customers, explained Alexandre Henon, marketing director of audio solutions at NXP. Toward this end, the company adapted the ECNR to automotive requirements and ported the software on two NXP chipset families.

Hardware Options for NXP ENCR Solution: 

  • SAF775x automotive radio-audio one chip: NXPs SAF775x integrates up to 2 AM/FM tuners, radio processing, an automotive audio hub and an open HiFi2 core for advanced audio algorithms. SAF775x has rich analog and digital interfaces, flexible audio mixer and filter structure, and core audio processing algorithms. The SAF775x family radio-audio one chip is a market-proven solution and has been successfully designed in major automotive OEM platforms.
  • i.MX applications processors for automotive infotainment:  i.MX applications processors offer a feature and performance-scalable multicore platform that includes single, dual and quad-core families based on the Arm v7-A and Arm v8 architecture based solutions with powerful processing for neural networks, advanced graphics, machine vision, video, audio, voice and safety-critical requirements.

The ECNR algorithm is running on the HiFi2 core of SAF775x, ready be activated by a key code.

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