Patent ID: 9124980
Filing Date: 2015-09-01
Classification: H04R

Abstract:
1. A method for playback of audio signals in a headphone device comprising: detecting a connection between a headphone device and an electronic playback device; sending an audio test signal to said headphone device, said audio test signal comprising a plurality of signals having energy at frequencies between 20 Hz and 20 KHz; measuring an electrical current and voltage delivered to said headphone device during playback of said audio test signal; computing an impedance of said headphone device from said measured voltage and said measured electrical current; comparing said impedance of said headphone device with impedance data from a plurality of previously measured headphone devices; and setting gain and equalization settings of said electronic playback device based on the comparison of said impedance of said headphone device with the impedance data of said plurality of said previously measured headphone devices.