Motorola Mobility LLC

Seungho L Kim

John Joseph Gorsica

Giles T Davis

Eric Jay Hefner

Joseph C Dwyer

An adaptive echo cancellation system introduces an acoustic reference signal to audio content being transmitted to the speaker for playback. The acoustic reference signal is an out-of-band signal, such as an ultrasonic signal, which is typically not audible to humans. The microphone of the mobile device receives the audio content played back by the speaker as well as audio content introduced by the user (e.g., the speech of the user). The adaptive echo cancellation system detects the acoustic reference signal and determines a time delay between when the acoustic reference signal was introduced to the audio content and when the audio content including the acoustic reference signal was received by the mobile device. Echo is cancelled from the received audio content based on this determined time delay.

Adaptive echo delay determination using an out-of-band acoustic reference signal

A portable electronic device provides adaptive vibration noise reduction by generating a user alert vibration that is one of a first magnitude and a second magnitude, with the first magnitude being greater than the second magnitude. The portable device is configured to alert the user by providing a first magnitude alert vibration except when the device is lying flat and ambient noise at the device is low, and to provide a second magnitude alert vibration when the device is lying flat and ambient noise at the device is low.

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Vernon Hills, IL, United States of America

Seungho L Kim