On-ear transition detection
AssigneeCirrus Logic, Inc.
InventorJohn P. Lesso
Life of this patent
Estimating the term…
Abstract
The disclosure relates in general to on-ear transition detection, and in particular to on-ear transition detection circuitry comprising: a monitoring unit operable to monitor a speaker current flowing through a speaker and/or a speaker voltage induced across the speaker, and to generate a monitor signal indicative of the speaker current and/or the speaker voltage; and an event detector operable to detect a qualifying disturbance in a sensor signal indicative of a qualifying pressure change incident on the speaker caused by the speaker transitioning from an on-ear state to an off-ear state or vice versa, wherein the sensor signal is, or is derived from, the monitor signal.
Claims20
On-ear transition detection circuitry, comprising:
- a monitoring unit operable to monitor a speaker current flowing through a speaker and to generate a monitor signal indicative of the speaker current;
- and
- an event detector operable to detect a qualifying disturbance in a sensor signal indicative of a qualifying pressure change incident on the speaker caused by the speaker transitioning from an on-ear state to an off-ear state or vice versa, wherein the sensor signal is, or is derived from, the monitor signal;
- wherein for each qualifying pressure change, the corresponding qualifying disturbance is a step response in the time domain or ringing in the time domain in the sensor signal.
A method of detecting a transition of a speaker from an on-ear state to an off-ear state or vice versa, the method comprising:
- generating a monitor signal indicative of a speaker current flowing through the speaker;
- and
- detecting a disturbance in a sensor signal indicative of the transitioning, wherein the sensor signal is, or is derived from, the monitor signal;
- wherein the disturbance is a step response in the time domain or ringing in the time domain in the sensor signal.
On-ear transition detection circuitry, comprising:
- a monitoring unit operable to monitor a speaker current flowing through a speaker and to generate a monitor signal indicative of the speaker current;
- and
- an event detector operable to detect a qualifying disturbance in a sensor signal indicative of a qualifying pressure change incident on the speaker caused by the speaker transitioning from an on-ear state to an off-ear state or vice versa, wherein the sensor signal is, or is derived from, the monitor signal;
- wherein for each qualifying pressure change, the corresponding qualifying disturbance is a step response or ringing in the sensor signal,
- wherein the on-ear transition detection circuitry further comprises a speaker driver operable to drive the speaker based on a speaker signal,
- wherein:
- the event detector comprises a microphone signal generator;
- the microphone signal generator is operable, when a candidate pressure change is incident on the speaker, to generate a microphone signal representative of the candidate pressure change based on the monitor signal and the speaker signal;
- and
- the sensor signal is or is derived from the microphone signal.
Dependencies are inferred from the claim text.