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1. (WO2018220346) AUDIO AMPLIFIERS

Pub. No.:    WO/2018/220346    International Application No.:    PCT/GB2018/051396
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Thu May 24 01:59:59 CEST 2018
IPC: H03F 1/32
H03F 3/187
H04R 3/04
Applicants: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LIMITED
Inventors: LESSO, John Paul
IDO, Toru
Title: AUDIO AMPLIFIERS
Abstract:
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 (SIN) and an output for outputting an audio driving signal (VOUT). 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 (SFF) derived from the input signal and a second signal (SFB) indicative of the voltage of the audio driving signal and determine a first error signal (£1) 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.