Abstract: Described herein are embodiments for reducing haptic vibrations for electronic devices. Embodiments of an oscillation reduction scheme learned offline are disclosed for minimizing the acceleration for a haptic vibrator. A pattern and braking generation module outputs a pattern signal for amplification and then for driving the haptic vibrator. An accelerometer measures acceleration induced by vibration from the haptic vibrator. The pattern and braking generation module adjusts the pattern signal based on the measured acceleration to identify an optimal amplitude for a braking signal at each time frame. Such a closed-loop braking optimization process may be implemented to achieve an optimal or desired braking scheme for enhanced user haptic feedback.

Abstract: A current based resonant frequency tracking system and methods can include: providing a haptic pattern with a processor, the haptic pattern including both a haptic pattern start time and a haptic pattern stop time; driving a linear resonant actuator according to the haptic pattern with an amplifier coupled to the processor, and the amplifier having an output coupled to the linear resonant actuator; detecting a current sense signal having a back electromotive force current after the haptic pattern stop time with a current frequency tracker coupled to the output of the amplifier; measuring a frequency of the back electromotive force current as a resonant frequency of the linear resonant actuator; and detecting cycles in the back electromotive force current after the haptic pattern stop time.

Abstract: Described herein are system and method embodiments for adaptive noise control for headphones, specifically for open-ear headphones. A leakage detection module in an ambient sound control (ASC) circuit implements leakage detection to determine a leakage mode. Based on the determined leakage mode, an ASC profile may create, select or modify an ASC profile for the ASC circuit to operate. Pilot tone, ambient noise, or audio playback may be used respectively or in combination for leakage detection. Experimental results show that embodiments of adaptive ASC approach may achieve improved performance compared to a default ASC, especially under loose fitting of an earphone.

Abstract: Described herein are system and method embodiments of acoustic augmentation of haptic vibration with correlated sounds. Embodiments of a haptic driven signal crossing both vibration band and acoustic band are disclosed. The driven signal at the acoustic band enables a haptic in an electronic device to provide an audio augmentation for haptic vibration independent from a loudspeaker of the electronic device. Upon a touch on a touch surface is detected, a vibration request is generated based on the touch and user preferences. A pattern generator is used to generate a vibration signal based on the vibration request to drive a haptic vibrator for desired vibration and acoustic sound patterns.

Abstract: Described herein are system and method embodiments for adaptive noise control for headphones, specifically for open-ear headphones. A leakage detection module in an ambient sound control (ASC) circuit implements leakage detection to determine a leakage mode. Based on the determined leakage mode, an ASC profile may create, select or modify an ASC profile for the ASC circuit to operate. Pilot tone, ambient noise, or audio playback may be used respectively or in combination for leakage detection. Experimental results show that embodiments of adaptive ASC approach may achieve improved performance compared to a default ASC, especially under loose fitting of an earphone.

Abstract: The implementations describe a method and a system to perform the method to reduce buzzing in a speaker by obtaining a signal having an audio content, determining a first value of spectral density of the audio content at a first resonance frequency, the first resonance frequency associated with a mechanical motion of at least one member of a speaker assembly, determining a second value of spectral density of the audio content at a second resonance frequency, the second resonance frequency associated with a port of the speaker assembly, determining, responsive to the first value and the second value, that the signal is to produce buzzing of the speaker at the second resonance frequency, producing a modified signal by limiting spectral density of the audio content at the first resonance frequency, and providing the modified signal to the speaker.

Abstract: Described herein are embodiments for reducing haptic vibrations for electronic devices. Embodiments of an oscillation reduction scheme learned offline are disclosed for minimizing the acceleration for a haptic vibrator. A pattern and braking generation module outputs a pattern signal for amplification and then for driving the haptic vibrator. An accelerometer measures acceleration induced by vibration from the haptic vibrator. The pattern and braking generation module adjusts the pattern signal based on the measured acceleration to identify an optimal amplitude for a braking signal at each time frame. Such a closed-loop braking optimization process may be implemented to achieve an optimal or desired braking scheme for enhanced user haptic feedback.

Abstract: Described herein are system and method embodiments of acoustic augmentation of haptic vibration with correlated sounds. Embodiments of a haptic driven signal crossing both vibration band and acoustic band are disclosed. The driven signal at the acoustic band enables a haptic in an electronic device to provide an audio augmentation for haptic vibration independent from a loudspeaker of the electronic device. Upon a touch on a touch surface is detected, a vibration request is generated based on the touch and user preferences. A pattern generator is used to generate a vibration signal based on the vibration request to drive a haptic vibrator for desired vibration and acoustic sound patterns.

Abstract: The implementations describe a method and a system to perform the method to reduce buzzing in a speaker by obtaining a signal having an audio content, determining a first value of spectral density of the audio content at a first resonance frequency, the first resonance frequency associated with a mechanical motion of at least one member of a speaker assembly, determining a second value of spectral density of the audio content at a second resonance frequency, the second resonance frequency associated with a port of the speaker assembly, determining, responsive to the first value and the second value, that the signal is to produce buzzing of the speaker at the second resonance frequency, producing a modified signal by limiting spectral density of the audio content at the first resonance frequency, and providing the modified signal to the speaker.