Patent ID: 11877126
Assignee: GOOGLE LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 19:
20. A method for measuring excursion of an audio speaker comprising a magnet and a voice coil positioned in a magnetic field of the magnet, the voice coil defining an axis extending in a first direction, the method comprising:
energizing the voice coil, wherein the voice coil is configured to oscillate along the first direction when energized;
determining an electrical parameter of current flow in a sense coil, the sense coil being included in a flexible printed circuit (FPC) coupled to a surface of a frame of the audio speaker, the surface extending in a plane non-parallel to the first direction; and
based on the electrical parameter, determining a distance between the voice coil and the sense coil in the first direction.