Patent ID: 9131320
Filing Date: 2015-09-08
Classification: H04M,H04R

Abstract:
1. A portable audio device comprising; a smart phone having a handset housing in which are integrated a microphone that is to pick up the voice of a user of the smart phone during a call, mobile phone network communications circuitry that receives a desired audio signal from a wireless base station as part of a downlink audio signal during the call, active noise cancellation circuitry to generate an anti-noise signal for cancellation of background acoustic noise surrounding the user of the portable audio device during the call, an earpiece speaker having a voice coil to convert into audible form, while producing a by-product magnetic field signal, the desired audio signal combined with the anti-noise signal, and a hearing aid compatibility circuit coupled to convert the desired audio signal, and not the anti-noise signal, into a primary magnetic field signal for coupling with a telecoil of a hearing aid that is outside the handset housing, wherein the hearing aid compatibility circuit is to produce the primary magnetic field signal as being stronger than a by-product magnetic field signal produced by the voice coil.