US 11,689,871 B2
On-ear transition detection
John P. Lesso, Edinburgh (GB)
Assigned to Cirrus Logic, Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Aug. 9, 2021, as Appl. No. 17/396,974.
Application 17/396,974 is a continuation of application No. 16/829,600, filed on Mar. 25, 2020, granted, now 11,089,415.
Prior Publication US 2021/0377680 A1, Dec. 2, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04R 29/00 (2006.01)
CPC H04R 29/001 (2013.01) [H04R 2400/01 (2013.01); H04R 2460/03 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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.