Patent ID: 9264823
Filing Date: 2016-02-16
CPC Classification: H04R

Claim Text:
1. An audio system comprising: an earbud configured for insertion into a user's ear, the earbud including a speaker and a microphone, wherein the speaker is configured to receive and play an audio speaker signal for the user and the microphone is configured to output an audio microphone signal; and a processor coupled to the speaker and the microphone to determine a ratio of (1) an energy estimation of the audio speaker signal to (2) an energy estimation of the audio microphone signal, at low frequencies, determine a ratio of (1) an energy estimation of the audio speaker signal to (2) an energy estimation of the audio microphone signal, at high frequencies, wherein the high frequencies are within 1 kHz to 10 kHz, determine a gain based upon both the ratio at low frequencies and the ratio at high frequencies, based upon the gain, select a shelving filter, and apply the shelving filter to the audio speaker signal.