公开(公告)号：US20210044906A1

公开(公告)日：2021-02-11

申请号：US17079578

申请日：2020-10-26

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Paul LESSO ,  Cedric ANDRIEU ,  Calum CUTHILL

IPC: H04R23/00 ,  H04B1/04 ,  H04B11/00 ,  H04R3/04 ,  H03G3/20 ,  G01S7/52 ,  G01S7/524 ,  G01S15/10 ,  H03G3/00

Abstract: Driver circuitry is disclosed for driving an electroacoustic transducer to provide an output comprising both ultrasonic and audio signal components. The driver circuitry comprises an adjustment module configured to reduce the level of said ultrasonic component signal in response to an increase in an operational variable indicative of a level of said audio signal component, while also increasing the pulse duration, duty cycle, repetition frequency or frequency span or bandwidth of the ultrasonic component.