US 2020/0090635 A1 · ACTIVE DUCT NOISE CONTROL SYSTEM AND METHOD THEREOF

Abstract

An active duct noise control system and a method thereof are provided, including a duct, a noise source speaker, a microphone, a plurality of noise-cancelling speakers, and a plurality of controllers. Wherein, the noise source speaker generates the primary noise, and the microphone is disposed to receive the residual noise. The plurality of noise-cancelling speakers are disposed between the noise source speaker and the microphone and respectively generate noise-cancelling audio frequencies to offset the primary noise and reduce the residual noise. The plurality of controllers are respectively connected to the plurality of noise-cancelling speakers and the noise source speaker and calculate each of the noise-cancelling audio frequencies generated by each of the plurality of noise-cancelling speakers according to the multi-channel inverse filtering principle.

Claims10

Dependent claims

An active duct noise control system, comprising:

a duct;
a noise source speaker, disposed on one end of the duct and generating a primary noise;
a microphone, disposed on the other end of the duct and receiving a residual noise;
a plurality of noise-cancelling speakers, disposed between the noise source speaker and the microphone and respectively generating noise-cancelling audio frequencies to offset the primary noise and reduce the residual noise;
and
a plurality of controllers, respectively connected to the plurality of noise-cancelling speakers and the noise source speaker and calculating each of the noise-cancelling audio frequencies generated by each of the plurality of noise-cancelling speakers according to a multi-channel inverse filtering principle.

3 more elements

A active duct noise control method applicable to controlling a primary noise generated by a noise source speaker in a duct, wherein the duct comprises a plurality of noise-cancelling speakers, a plurality of controllers which control the plurality of noise-cancelling speakers, and a microphone;

the active duct noise control method comprises the following steps:
disposing the noise source speaker on one end of the duct and disposing the microphone on the other end of the duct to receive a residual noise;
disposing the plurality of noise-cancelling speakers between the noise source speaker and the microphone;
connecting the plurality of controllers to the noise source speaker to receive the primary noise and calculating noise-cancelling audio frequencies generated by each of the plurality of noise-cancelling speakers according to a multi-channel inverse filtering principle;
and
respectively generating each of the noise-cancelling audio frequencies to offset the primary noise and reduce the residual noise by the plurality of noise-cancelling speakers.

3 more elements

Dependencies are inferred from the claim text.

Active duct noise control system and method thereof

Life of this patent

Active duct noise control system and method thereof

Life of this patent

Abstract

Claims10