US 10,554,189 B2 · Analogue signal paths

Abstract

This application relates to audio circuits, such as audio driving circuits, with improved audio performance. An audio arrangement (200) has an audio circuit (201) with a forward signal path between an input (102) for an input digital audio signal (DIN) and an output (103) for an output analogue audio signal (AOUT). The circuit also has a feedback path comprising an analogue-to-digital conversion module (202) for receiving an analogue feedback signal (VFB) derived from the output analogue audio signal and outputting a corresponding digital feedback signal (DFB). The analogue-to-digital conversion module (202) has an ADC (108), an analogue gain element (203) configured to apply analogue gain (GA) to the analogue feedback signal before the ADC and a digital gain element (204) for applying digital gain (GD) to a signal output from the ADC. A gain controller (205) controls the analogue gain and the digital gain applied based on the input digital audio signal (DIN).

Claims20

Dependent claims

An audio circuit comprising:

a forward signal path with an input for an input digital audio signal and an output for an output analogue audio signal;
a feedback path electrically coupled to the forward signal path, the feedback path comprising an analogue-to-digital conversion module for receiving an analogue feedback signal derived from the output analogue audio signal and outputting a corresponding digital feedback signal;
wherein the analogue-to-digital conversion module comprises an analogue-to-digital converter (ADC);
an analogue gain element configured to apply analogue gain to the analogue feedback signal before the ADC;
and a digital gain element for applying digital gain to a signal output from the ADC;
and
a gain controller for controlling the analogue gain and the digital gain applied based on the input digital audio signal, wherein the analogue gain element is a variable analogue gain element and the digital gain element is a variable digital gain element and the gain controller selectively controls the analogue gain of the variable analogue gain element and the digital gain of the variable digital gain element.

4 more elements

Dependencies are inferred from the claim text.

Analogue signal paths

Life of this patent

Analogue signal paths

Life of this patent

Abstract

Claims20