System for active noise control with audio signal compensation
First Claim
1. A sound reduction system comprising:
- a processor; and
an active noise control system executable by the processor, the active noise control system configured to;
filter a first audio channel signal with a first estimated path filter, the first estimated path filter representative of a first physical path traversed by the first audio channel signal;
filter a second audio channel signal with a second estimated path filter, the second estimated path filter representative of a second physical path traversed by the second audio channel signal that is different from the first physical path;
combine the first audio channel filtered with the first estimated path filter and the second audio channel filtered with the second estimated path filter to form a combined audio channel signal; and
generate an error signal used in generation of an anti-noise signal, the error signal generated based on the combined audio channel signal and a microphone input signal representative of audible sound at a target space.
2 Assignments
0 Petitions
Accused Products
Abstract
An active noise control system generates an anti-noise signal to drive a speaker to produce sound waves to destructively interfere with an undesired sound in a targeted space. The speaker is also driven to produce sound waves representative of a desired audio signal. Sound waves are detected in the target space and a representative signal is generated. The representative signal is combined with an audio compensation signal to remove a signal component representative of the sound waves based on the desired audio signal and generate an error signal. The active noise control adjusts the anti-noise signal based on the error signal. The active noise control system converts the sample rates of an input signal representative of the undesired sound, the desired audio signal, and the error signal. The active noise control system converts the sample rate of the anti-noise signal.
188 Citations
20 Claims
-
1. A sound reduction system comprising:
-
a processor; and an active noise control system executable by the processor, the active noise control system configured to; filter a first audio channel signal with a first estimated path filter, the first estimated path filter representative of a first physical path traversed by the first audio channel signal; filter a second audio channel signal with a second estimated path filter, the second estimated path filter representative of a second physical path traversed by the second audio channel signal that is different from the first physical path; combine the first audio channel filtered with the first estimated path filter and the second audio channel filtered with the second estimated path filter to form a combined audio channel signal; and generate an error signal used in generation of an anti-noise signal, the error signal generated based on the combined audio channel signal and a microphone input signal representative of audible sound at a target space. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A sound reduction system comprising:
-
an active noise control system that includes a plurality of estimated path filters; the active noise control system configured to receive a plurality of separate audio channel signals from an audio system, the audio channel signals including a first audio channel signal and a second audio signal; the active noise control system further configured to apply a corresponding first one of the plurality of estimated path filters to the first audio channel signal and a second one of the plurality of estimated path filters to the second audio channel signal to generate different respective filtered audio channel signals; the active noise control system further configured to combine the different respective filtered audio channel signals to generate a combined filtered audio channel signal; and the active noise control system further configured to generate an anti-noise signal for combination with one of the first audio channel signal or the second audio channel signal to drive a loudspeaker, the anti-noise signal generated using the combined filtered audio channel signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A sound reduction system comprising:
-
an active noise control system configured to receive a plurality of separate and independent audio channel signals from an audio system; the active noise control system further configured to provide a plurality of speaker outputs to drive a plurality of respective loudspeakers; the active noise control system including a plurality of estimated path filters, each corresponding to at least a portion of an estimated physical path that includes representation of a physical path traversed by sound waves output by respective loudspeakers; the active noise control system further configured to independently apply at least two different estimated path filters to each of the respective audio channel signals to generate multiple filtered audio channel signals for each of the respective audio channel signals; and the active noise control system further configured to generate an anti-noise signal from the multiple filtered audio channel signals. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification