公开(公告)号：US11064293B2

公开(公告)日：2021-07-13

申请号：US16667224

申请日：2019-10-29

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ross Crawford Morgan ,  Robert David Rand ,  Richard Colin Fitzgerald

IPC: H03G3/00 ,  H04R3/00 ,  H03G3/30 ,  G10L21/034

Abstract: There is provided an apparatus for providing an output signal to an audio transducer, comprising: a first signal path for receiving a first digital audio input signal, applying a first digital gain, and outputting an amplified first digital audio input signal; a second signal path, for receiving a second digital audio input signal, applying a second digital gain, and outputting an amplified second digital audio input signal; converter circuitry, coupled to the first and second signal paths, for converting at least the amplified first and second digital audio input signals into the analogue domain, and outputting an analogue audio input signal; and an analogue gain element, for applying an analogue gain to the analogue audio input signal and outputting the output signal. The apparatus further comprises a control circuit, coupled to the first and second signal paths, operative to select the analogue gain based on a combination of at least the first and second digital audio input signals or signals derived therefrom, and to select the first and second digital gains so as to compensate for the analogue gain.