Patent ID: 11937509
Assignee: CIRRUS LOGIC INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 19:
20. Circuitry for driving a piezoelectric transducer, the circuitry comprising:
current monitor circuitry for monitoring a current through the piezoelectric transducer when the piezoelectric transducer is being driven by a drive signal output by the driver circuitry;
processing circuitry for determining a resonant frequency of the piezoelectric transducer based on the current through the piezoelectric transducer; and
pre-processing circuitry configured to generate a processed version of an input signal received by the circuitry by for applying first processing to the input signal if a frequency of the input signal is less than the determined resonant frequency and applying second processing to the input signal if the frequency of the input signal is greater than the determined resonant frequency;
wherein the driver circuitry is configured to generate the drive signal based on the processed version of the input signal.