US 11,423,872 B1 · Dynamic range enhancement (DRE) control in adaptive noise cancellation (ANC) applications

Abstract

A system that reproduces an output signal including dynamic range enhancement (DRE) reduces audible artifacts generated by changes in operating range of the dynamic range enhancement (DRE) when the output signal includes an adaptive noise canceling (ANC) component. A first detection circuit determines an input signal amplitude and a second detection circuit determines a measure of an amplitude of a noise canceling component of the input signal. A control circuit determines whether the amplitude of the noise canceling component is significant with respect to the input signal amplitude and controls characteristics of a dynamic range enhancer to override a default behavior of the dynamic range enhancer if the amplitude of the noise-canceling component is significant with respect to the input signal amplitude. The characteristics may include rise/fall times of a gain control of the dynamic range enhancer and may be controlled in multiple separate frequency bands.

Claims26

Dependent claims

A method of controlling a dynamic range enhancer (DRE) in an audio system that generates an audio output signal from an audio input signal having a combined noise-canceling component and a program component, the method comprising:

determining an amplitude of the audio input signal;
dynamically adjusting an operating dynamic range of the dynamic range enhancer to alter a dynamic range of the audio output signal in accordance with the amplitude of the audio input signal;
determining a measure of an amplitude of the noise-canceling component of the audio input signal;
performing a comparison of the amplitude of the noise-canceling component and the amplitude of the audio input signal;
and
responsive to a result of the comparison, adjusting characteristics of the dynamic range enhancer to override a default behavior of the dynamic range enhancer.

3 more elements

A system for reproduction of an audio input signal having a combined noise-canceling component and a program component, the system comprising:

a first detection circuit for determining an amplitude of the audio input signal;
a second detection circuit for determining a measure of an amplitude of the noise-canceling component;
an output stage for generating an audio output signal from the audio input signal, the output stage including a dynamic range enhancer for altering a dynamic range of the audio output signal in accordance with the amplitude of the audio input signal and an adjustable operating range of the dynamic range enhancer;
and
a control circuit for controlling characteristics of the dynamic range enhancer by performing a comparison of the amplitude of the noise-canceling component and the amplitude of the audio input signal, and responsive to a result of the comparison, adjusting the characteristics of the dynamic range enhancer to override a default behavior of the dynamic range enhancer.

2 more elements

Dependencies are inferred from the claim text.

Dynamic range enhancement (DRE) control in adaptive noise cancellation (ANC) applications

Life of this patent

Dynamic range enhancement (DRE) control in adaptive noise cancellation (ANC) applications

Life of this patent

Abstract

Claims26