Patent ID: 9379777
Filing Date: 2016-06-28
CPC Classification: H04B

Claim Text:
1. An apparatus comprising: a coil, where the coil is at least a part of a near field communication antenna; and near field communication (NFC) circuitry connected to the coil, where the NFC circuitry and the coil form at least part of a hearing aid compatibility (HAC) system of the apparatus, where the apparatus comprises a near field communication (NFC) system comprising the NFC circuitry and the coil, and where the NFC circuitry forms an amplifier of both the NFC system and the HAC system, where the NFC circuitry is configured to create a modulated signal from an input analog audio signal, and output the modulated signal to the coil to generate a magnetic field induction signal from the coil, where the magnetic field induction signal comprises data of the input analog audio signal, where the NFC circuitry forms the amplifier as an audio signal amplifier which is configured to use pulse-width modulation (PWM) on the input analog audio signal to produce the modulated signal, where the HAC system is configured such that in a HAC mode additional rounds/loops of the coil are used than when in a NFC mode to have an impedance for targeting the audio signal amplifier.