Noise Cancelling Headphones
Noise Cancellation in Automobiles
Common Active Noise Cancellation Applications
What about HVAC applications?
Can Active Noise Cancellation techniques be applied to HVAC applications?
Feed-forward ANC
Feed-back ANC
Hybrid ANC
ANC Concepts
Feed-back ANC with residual error microphone
Applications – where & why is this needed?
Building retrofit - more efficient equipment into existing space
Hotel ‘Ptech’ units
Mechanical / Boiler Rooms
Exterior equipment
Classroom units
Goals1) min. 10dB noise reduction from 20 Hz to 20 kHz2) easy to set up / calibrate (if necessary)3) ‘Function over Form’ Prototype - no size restriction4) Battery powered or 120 VAC powered
