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1. (WO2018220347) AUDIO AMPLIFIERS

Pub. No.:    WO/2018/220347    International Application No.:    PCT/GB2018/051397
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
Title: AUDIO AMPLIFIERS
Abstract:
An audio driving circuit (301) has a forward signal path between an input (103) for receiving an input audio signal (SIN) and an output (104) for outputting an output signal (SOUT) with an amplifier module (102). An error block (302) is arranged to receive a first signal (SFF) derived from the input signal and also a second signal (SFB) derived from the output signal and determine a first error signal (£1) indicative of a difference between the first and second signals. A first processing module (204) is operable to generate a compensation signal (Sc) to be applied to the input signal (SIN) upstream of the amplifier module (102) based on the first error signal. The error block (302) comprises a second processing module (303/303a) configured to apply a linear transfer function to one of the first signal or the second signals prior to determining the first error signal.