Multi-Domain Processing for Active Noise Cancellation

An apparatus comprising:

• active-noise-cancellation circuitry comprising:
• a first processing path configured to generate a first anti-noise signal component by processing an input noise reference signal in accordance with a pulse-density-modulation domain and using a first processing rate;
• a second processing path configured to generate a second anti-noise signal component by processing the input noise reference signal in accordance with a pulse-code-modulation domain and using a second processing rate, the second processing rate being slower than the first processing rate;
• a third processing path configured to generate a third anti-noise signal component by processing the input noise reference signal in accordance with the pulse-density-modulation domain or the pulse-code-modulation domain and by using a third processing rate, the third processing rate being between the first processing rate and the second processing rate;
• and
• a combiner configured to generate an anti-noise signal for active noise cancellation by combining the first anti-noise signal component, the second anti-noise signal component, and the third anti-noise signal component.

A computer-readable storage medium comprising instructions that, responsive to execution by a processor, cause active-noise-cancellation circuitry to:

• generate, using a first processing path of the active-noise-cancellation circuitry, a first anti-noise signal component by processing an input noise reference signal in accordance with a pulse-density-modulation domain and using at least one first processing rate;
• generate, using a second processing path of the active-noise-cancellation circuitry, a second anti-noise signal component by processing the input noise reference signal in accordance with a pulse-code-modulation domain and using at least one second processing rate, the at least one second processing rate being slower than the at least one first processing rate;
• generate, using a third processing path of the active-noise-cancellation circuitry, a third anti-noise signal component by processing the input noise reference signal in accordance with the pulse-density-modulation domain or the pulse-code-modulation domain and by using a third processing rate, the third processing rate being between the at least one first processing rate and the at least one second processing rate;
• and
• generate, using the active-noise-cancellation circuitry, an anti-noise signal for active noise cancellation by combining the first anti-noise signal component, the second anti-noise signal component, and the third anti-noise signal component.