Determining an amplitude of a braking portion of a waveform of a driving voltage signal for a linear resonant actuator

A non-transitory computer-readable medium storing computer code for controlling a processor to cause the processor to determine an amplitude of a braking portion of a waveform of a driving voltage signal for a linear resonant actuator determining an amplitude of a braking portion of a waveform of a driving voltage signal for a linear resonant actuator, the computer code including instructions to cause the processor to:

• obtain a measure of a characteristic of the linear resonant actuator, the characteristic being different from a quality factor of the linear resonant actuator, wherein the instructions that cause the processor to obtain the measure of the characteristic comprise one or both of instructions that cause the processor to:
• obtain a measure of a voltage as a function of a time in response to a sinusoidal chirp signal applied to the linear resonant actuator;
• and
• obtain a measure of a current as a function of the time in response to the sinusoidal chirp signal applied to the linear resonant actuator;
• determine, based on the measure of the characteristic, the quality factor;
• determine, based on the quality factor, the amplitude of the braking portion of the waveform of the driving voltage signal;
• and
• set, based on the amplitude, data for a driving voltage signal circuitry to cause the driving voltage signal circuitry to produce the driving voltage signal, the driving voltage signal having the waveform in which the braking portion has the amplitude.

A system for determining an amplitude of a braking portion of a waveform of a driving voltage signal for a linear resonant actuator, the system comprising:

• a memory configured to store a measure of a characteristic of the linear resonant actuator and data for a driving voltage signal circuitry;
• and
• a processor configured to:
• obtain the measure of the characteristic of the linear resonant actuator, the characteristic being different from a quality factor of the linear resonant actuator, wherein, to obtain the measure of the characteristic, the processor is configured to one or both of:
• obtain a measure of a voltage as a function of a time in response to a sinusoidal chirp signal applied to the linear resonant actuator;
• and
• obtain a measure of a current as a function of the time in response to the sinusoidal chirp signal applied to the linear resonant actuator;
• determine, based on the measure of the characteristic, the quality factor;
• determine, based on the quality factor, the amplitude of the braking portion of the waveform of the driving voltage signal;
• and
• set, based on the amplitude, the data for the driving voltage signal circuitry to cause the driving voltage signal circuitry to produce the driving voltage signal, the driving voltage signal having the waveform in which the braking portion has the amplitude.