System for active noise control with audio signal compensation

A sound reduction system comprising:

• a processor;
• and
• an active noise control system executable by the processor, the active noise control system configured to:
• receive an input signal representative of sound present in a target space, remove a first signal component from the input signal to generate an error signal, and generate an anti-noise signal based on the error signal, where the anti-noise signal is configured to drive a loudspeaker to produce an audible sound to destructively interfere with an undesired sound present in the target space,
• where the active noise control system is further configured to combine an audio compensation signal with the first input signal to remove the first signal component.

A sound reduction system comprising:

• a processor;
• and
• an active noise control system executable by the processor, the active noise control system configured to:
• receive an input signal representative of sound present in a target space, remove a first signal component from the input signal to generate an error signal, and generate an anti-noise signal based on the error signal, where the anti-noise signal is converted from a first sample rate to a second sample rate higher than the first sample rate, and where the anti-noise signal is configured to drive a loudspeaker to produce an audible sound to destructively interfere with an undesired sound present in the target space.

A method of reducing volume of an undesired sound present in a space comprising:

• generating an input signal representative of the undesired sound present in the space;
• removing a portion of the input signal representative of an audio signal using a predetermined filter;
• and
• generating an anti-noise signal based on the input signal with the portion removed to drive a loudspeaker to produce an audible signal to destructively interfere with the undesired sound.

A method of reducing volume of an undesired sound present in a space comprising:

• generating an input signal representative of the undesired sound present in the space;
• removing a portion of the input signal representative of an audio signal by:
• generating an audio compensation signal;
• and
• combining the audio compensation signal with the input signal;
• and
• generating an anti-noise signal based on the input signal with the portion removed to drive a loudspeaker to produce an audible signal to destructively interfere with the undesired sound.

A method of reducing volume of an undesired sound present in a space comprising:

• generating an input signal representative of the undesired sound present in the space;
• removing a portion of the input signal representative of an audio signal by filtering the audio signal with an estimated audio path filter;
• and
• generating an anti-noise signal based on the input signal with the portion removed to drive a loudspeaker to produce an audible signal to destructively interfere with the undesired sound.

A method of reducing volume of an undesired sound present in a space comprising:

• generating an input signal representative of the undesired sound present in the space;
• removing a portion of the input signal representative of an audio signal;
• generating an anti-noise signal based on the input signal with the portion removed to drive a loudspeaker to produce an audible signal to destructively interfere with the undesired sound;
• and
• converting the anti-noise signal from a first sample rate to a second sample rate, where the second sample rate is higher than the first sample rate.

A plurality of instructions stored on a memory device that, when executed by a processor, cause the processor to:

• sample a first input signal at a first predetermined sample rate, where the first input signal is representative of sound in a target space;
• sample an audio signal at the first predetermined sample rate to generate a first audio signal;
• sample the audio signal at 192 kHz to generate a second audio signal;
• combine the first audio signal with the input signal to generate an error signal;
• convert the sample rate of the error signal from 192 kHz to the first predetermined sample rate;
• generate an anti-noise signal based on the error signal;
• and
• combine a second audio signal and the anti-noise signal to generate an audio output signal.