Electric vehicles (EVs) and hybrid electric vehicles (HEVs) produce virtually no engine noise at low speeds. This has raised concerns that, unlike conventional internal combustion engine vehicles, pedestrians may not be aware of the vehicle's approach, increasing the risk of accidents. To address this, regulations are being introduced that mandate the generation of simulated engine sounds or warning sounds.

The ADSP-BF706 digital signal processor (DSP) and Electric Vehicle Warning Sound System (EVWSS) firmware enable automakers in North America and around the world to comply with external engine sound mandates for low-speed EVs and HEVs.

This ADI solution provides hardware and firmware reference designs. It can be scaled for high-performance applications using the ADSP-BF706 or for cost-effective applications using the ADAU1450 digital audio processor. The ADSP-BF706 can also be used to generate in-cabin engine sounds to enhance the driver's driving experience. The ADSP-BF706 uses memory-mapped quad SPI memory for easier and faster access to the audio files used to create engine sounds. While existing products could only access 5 files, the ADSP-BF706 can access up to 24 WAV files simultaneously.

When using the ADAU1450, ADI's Sigma Studio Integrated Development Environment (IDE) allows developers to graphically tune audio performance. Even audio engineers with limited programming experience can optimize audio performance while reducing development time.

Meanwhile, a new Sigma Studio supporting the ADSP-BF706 is scheduled for release in the second half of this year. Additionally, a low-cost CAN software stack for the ADSP-BF706 can be used to rapidly build automotive prototypes.

The EVWSS product page is http://www.analog.com/evwss . To request an EVWSS firmware download, please visit http://www.analog.com/srf , and enter "EVWSS.2.0.0" in the additional comments field of the software request form.