The noise produced by internal combustion engines and exhaust components can be substantial. Conventional methods for reducing the transfer of such noise to the interior include reinforcing structural stiffness of the chassis. This adds weight to the vehicle, which translates to higher fuel consumption and CO2 emissions. In striving to reduce the environmental impact of cars with combustion engines, engineers are developing “downsized” engines with smaller displacements, fewer cylinders and turbo chargers. Moreover, OEMs (Original Equipment Manufacturers) actively pursue fuel saving, emission-reducing measures such as cylinder deactivation that induce low frequency noise inside the cabin.
HALOsonic® Sound2Target™ (S2T™) is a combination of Engine Order Cancellation (EOC) and internal Electronic Sound Synthesis (iESS). The system simultaneously reduces low frequency engine noise and synthesizes harmonics to enhance the engine sound. Based on real-time engine parameters, the S2T controller outputs anti-noise and engine harmonics through the vehicle’s existing loudspeakers. Error microphones provide feedback on the amplitude and phase to refine noise-cancelling effects. The adaptive technology enables fuel efficiency improvements by reducing the need for traditional passive noise control countermeasures and helps OEMs refine the sound signature of their vehicles.
- S2T helps OEMs attain finely defined target sounds as the technology reduces low frequency engine noise while enhancing the basic engine sound simultaneously.
- A 3-in-1 offering: S2T provides OEMs the flexibility to switch ON either the sound synthesis only or cancellation only or both sound synthesis and cancellation.
- The patented HALOsonic TrueAudio technology ensures music signals remain unaffected by noise cancellation.
- S2T helps OEMs reduce weight thereby decreasing fuel consumption and CO2 emissions.