Methods and apparatuses for driving audio and ultrasonic signals from the same transducer
AssigneeCirrus Logic, Inc.
InventorsJohn Paul Lesso, Cedric Andrieu, Calum Cuthill
Life of this patent
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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.
Claims20
Driver circuitry, configurable to provide an output signal comprising an ultrasonic signal component and an audio signal component, the driver circuitry comprising:
- an ultrasonic signal generator for generating the ultrasonic signal component;
- wherein at least two different parameters of the ultrasonic signal component are dependent on a level of the audio signal component.
Driver circuitry, configurable to provide an output signal comprising an ultrasonic signal component and an audio signal component, the driver circuitry comprising:
- an ultrasonic signal generator for generating the ultrasonic signal component;
- wherein a plurality of different parameters of the ultrasonic signal component are dependent on a parameter of the audio signal component.
Driver circuitry for providing an output signal comprising an ultrasonic signal component and an audio signal component, wherein the driver circuitry is configured to:
- receive an audio source signal comprising an audio band signal component;
- receive an ultrasonic source signal;
- adjust the ultrasonic source signal based on the audio source signal to generate the ultrasonic signal component of the output signal;
- and
- combine the audio source signal with the ultrasonic signal component to generate the output signal,
- wherein adjusting the ultrasonic source signal comprises varying two or more different parameters of the ultrasonic source signal based on the audio source signal.
Dependencies are inferred from the claim text.