Active noise control for vehicle door noise
An active noise control system ( 100 ) and method modifies a noise made when a vehicle closure, such as a door, hood, or trunk, closes by detecting the closure's velocity and selecting a delay time and control noise amplitude appropriate for the velocity. By modifying the noise of a vehicle door closing, the system ( 100 ) can reduce the frequency and reverberation of the noise generated by the door, improving user perception of the vehicle itself.
1. A method of controlling a door noise generated by a closing vehicle door, comprising:
detecting a value corresponding to a door closing velocity;
selecting a control noise output delay time based on the detecting step; and
outputting a control noise, wherein the control noise mixes with the door noise to generate a desired mixed noise.
2. The method of claim 1 , wherein the detecting step comprises detecting an elapsed time between a first switch position and a second switch position.
3. The method of claim 2 , wherein the first switch position corresponds to closing of a first switch and the second switch position corresponds to a closing of a second switch.
4. The method of claim 1 , wherein the detecting step comprises detecting an elapsed time between a first switch closing and a second switch closing.
5. The method of claim 1 , further comprising selecting a control noise amplitude based on the detecting step.
6. The method of claim 5 , wherein the control noise amplitude is zero if the value corresponding to the door closing velocity is below a selected threshold.
7. The method of claim 1 , further comprising selecting a speaker in proximity to the closing vehicle door for outputting the control noise.
8. The method of claim 1 , further comprising:
comparing the mixed noise with a template; and
a modifying characteristic of the control noise based on the comparing step.
9. A method of controlling a door noise generated by a closing vehicle door, wherein the vehicle door is one of a plurality of vehicle doors in a vehicle, comprising:
detecting an elapsed time between a first switch position and a second switch position of a switch activated by the closing vehicle door, wherein the elapsed time corresponds to a door closing velocity;
selecting a control noise output delay time and a control noise amplitude based on the elapsed time;
selecting a speaker corresponding to the closing vehicle door based on activation of the switch; and
outputting the control noise through the speaker selected in the selecting step, wherein the control noise mixes with the door noise to generate a desired mixed noise.
10. The method of claim 9 , wherein the control noise amplitude is zero if the elapsed time is below a selected threshold.
11. The method of claim 9 , further comprising:
comparing the mixed noise with a template; and
a modifying characteristic of the control noise based on the comparing step.
12. An active noise control system for controlling a door noise generated by a closing vehicle door in a vehicle, the vehicle having a plurality of speakers, a plurality of vehicle doors and a switch associated with each of the vehicle doors, comprising:
a processor that detects an elapsed time between a first position and a second position of the switch associated with the closing vehicle door and calculates a control noise output delay time and a control noise amplitude based on the elapsed time, wherein the elapsed time corresponds to a door closing velocity; and
a signal generator that outputs a control noise output signal to at least one of said plurality of speakers, wherein said at least one speaker outputs a control noise that mixes with the door noise to generate a desired mixed noise.
13. The active noise control system of claim 12 , wherein the processor sets the control noise amplitude equal to zero if the elapsed time is below a selected threshold.
14. The active noise control system of claim 12 , wherein the switch is a two-stage switch.
15. The active noise control system of claim 12 , further comprising at least one microphone that detects the mixed noise, wherein the processor compares the mixed noise with a template and modifies the control noise output signal in the signal generator based on the comparison.
16. The active noise control system of claim 12 , wherein the processor selects a speaker closest to the vehicle door to output the control noise.