Active noise cancellation systems and methods
Embodiments include fenestration units with active sound canceling properties, retrofit units with active sound canceling properties and related methods. In an embodiment a fenestration unit with active sound canceling properties can include an glazing unit including an exterior transparent pane, an interior transparent pane, and an internal space disposed between the exterior and interior transparent panes. The fenestration unit can include an active noise cancellation system including an exterior module including a sound input device and a signal emitter. An interior module can include a signal receiver to receive the signal from the signal emitter, and a vibration generator configured to vibrate the interior transparent pane. A sound cancellation control module can control the vibration generator to vibrate the interior transparent pane and generate pressure waves causing destructive interference with a portion of the sound waves received by the sound input device. Other embodiments are also included herein.
1. A fenestration unit with active sound canceling properties comprising:
an insulated glazing unit mounted within a frame, the insulated glazing unit comprising: an exterior transparent pane; an interior transparent pane; an internal space disposed between the exterior and interior transparent panes; and a spacer unit disposed between the exterior and interior transparent panes; and
an active noise cancellation system comprising:
an exterior housing module connected to an exterior side of the exterior transparent pane, the exterior housing module comprising a first suction cup, a sound input device and a signal emitter configured to emit a signal based on a signal received from the sound input device, wherein the first suction cup connects the exterior housing module to the exterior side of the exterior transparent pane;
an interior housing module connected to an interior side of the interior transparent pane, the interior housing module comprising a second suction cup, a signal receiver to receive the signal from the signal emitter and a vibration generator configured to vibrate the interior transparent pane, wherein the second suction cup connects the interior housing module to the interior side of the interior transparent pane; and
a sound cancellation control module in electrical communication with at least one of the exterior housing module and the interior housing module;
wherein the sound cancellation control module controls the vibration generator to vibrate the interior transparent pane and generate pressure waves causing destructive interference with a portion of sound waves received by the sound input device;
wherein the sound input device is positioned at least 3 millimeters away from an outside surface of the exterior transparent pane.
2. The fenestration unit of claim 1 , wherein the sound cancellation control module is housed within the interior housing module.
3. The fenestration unit of claim 1 , wherein the active noise cancellation system decreases the volume of sound originating from outside of the exterior transparent pane by at least 5 B decibels as measured from a point within 5 centimeters of an inside surface of the interior transparent pane.
4. The fenestration unit of claim 3 , wherein the volume of sound originating from outside of the exterior transparent pane is decreased by at least 10 decibels.
5. The fenestration unit of claim 3 , wherein the volume of sound originating from outside of the exterior transparent pane is decreased by at least 15 decibels.
6. The fenestration unit of claim 1 , the interior housing module further comprising an induction transmitting coil and the exterior housing module further comprising an induction receiving coil, the induction transmitting coil and induction receiving coil configure to convey power from the interior housing module to the exterior housing module.
7. The fenestration unit of claim 1 , the sound input device comprising a transducer that converts acoustical waves into electrical signals.
8. The fenestration unit of claim 1 , the sound input device comprising a microphone.
9. The fenestration unit of claim 8 , the microphone selected from the group consisting of externally polarized condenser microphones, prepolarized electret condenser microphones, and piezoelectric microphones.
10. The fenestration unit of claim 1 , the sound input device comprising a device selected from the group consisting of an accelerometer with digital or analog output, a piezoelectric film and an optical sensor.
11. The fenestration unit of claim 1 , the vibration generator comprising an acoustic exciter.
12. The fenestration unit of claim 1 , wherein the fenestration unit is a window.
13. The fenestration unit of claim 1 , wherein the fenestration unit is a door.
14. The fenestration unit of claim 1 , further comprising a user interface panel in electrical communication with the sound cancellation control module, the user interface panel comprising a user input device and an output device.
15. The fenestration unit of claim 1 , wherein the sound cancellation control module controls the vibration generator to vibrate the interior transparent pane and generate pressure waves causing destructive interference with the sound waves only at selected frequencies.
16. The fenestration unit of claim 1 , wherein the sound cancellation control module controls the vibration generator to vibrate the interior transparent pane and generate pressure waves causing amplification of sound waves at selected frequencies.
17. The fenestration unit of claim 1 , wherein the signal emitter and the signal receiver communicate via optical signals passing through the exterior transparent pane and the interior transparent pane.
18. The fenestration unit of claim 1 , wherein the signal emitter and the signal receiver are in wireless communication that passes through both the exterior transparent pane and the interior transparent pane.
19. An active noise cancellation system for a fenestration unit comprising:
an exterior housing module configured to be connected to an exterior transparent pane of the fenestration unit, the exterior housing module comprising a microphone and a signal emitter configured to emit a wireless signal based on a signal received from the microphone;
an interior housing module configured to be connected to an interior transparent pane of the fenestration unit, the interior housing module comprising a signal receiver to receive the wireless signal from the signal emitter and an acoustic exciter configured to vibrate the interior transparent pane; and
a sound cancellation control module in electrical communication with at least one of the exterior housing module and the interior housing module;
wherein the sound cancellation control module controls the vibration generator to vibrate the interior transparent pane and generate pressure waves causing destructive interference with a portion of sound waves received by the microphone;
wherein the sound input device is positioned at least 3 millimeters away from an outside surface of the exterior transparent pane;
wherein the signal emitter and the signal receiver are in wireless communication that passes through both the exterior transparent pane and the interior transparent pane.
20. The active noise cancellation system for a fenestration unit of claim 19 , the wireless communication comprising a digital signal representing the sound received by the exterior module.