Importance

Loading Importance Indicators...

Abstract

This application relates to methods and apparatus for amplification of audio signals with improved audio performance. An audio driving circuit (200) has an amplifier module (102) in a forward signal path between an input (103) for receiving an input audio signal (S_IN) and an output for outputting an audio driving signal (V_OUT). A pre-distortion module (202) is operable to apply a first transfer function to the signal in the forward signal path upstream of the amplifier module, wherein the first transfer function comprises a non-linear distortion function based on at least one distortion setting. An error block (203) is arranged to receive a first signal (S_FF) derived from the input signal and a second signal (S_FB) indicative of the voltage of the audio driving signal and determine a first error signal (ε₁) indicative of a difference between the first and second signals. The pre-distortion module (202) is operable to control the distortion setting(s) based on the first error signal.

Loading the Abstract Image...

First Claim