Maxim Integrated Products, Inc.

Vivek Prakash Nigam

Robert Polleros

Anthony Stephen Doy

Sangwon Lee

Jonathan Chien

Mansur Kiadeh

Todd D Moore

Sang Youl Choi

Jianjun He

Wen Jin

Yadong Wang

A near infrasonic sound-based control system and method for a wearable electronic device can include: detecting a near infrasonic sound wave with a microphone, the near infrasonic sound wave resulting from a gesture of a user, correlating an input command to the near infrasonic sound wave; and executing the input command on the wearable electronic device.

Near infrasonic sound-based control system

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.

Oscillation reduction in haptic vibrators by minimization of feedback acceleration

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.

Robust open-ear ambient sound control with leakage detection

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.

Acoustic augmentation of haptic vibration with correlated sounds

A mobile computing device includes one or more digital signal processors, each configured to receive a respective digital signal, one or more amplifiers, each configured to receive a respective digital signal, and one or more output generators configured to receive an output of a respective amplifier, and a battery configured to supply power to at least the amplifier(s). The digital signal processors include an intelligent current limiter. The intelligent current limiter is configured to determine a power consumption limit based on a battery voltage of the battery, a battery current limit defined by a battery current budget for operation of at least the amplifiers, and an efficiency of the amplifiers. The intelligent current limiter is configured to determine a predicted power consumption by the amplifiers based on voltages of the digital signals, a gain of each of the respective amplifiers, and an admittance of each of the respective output generators. The intelligent current limiter compares the predicted power consumption with the power consumption limit and adjusts the gain setting(s) of one or more of the digital signal processors based on the comparison prior to supplying the respective digital signals to the amplifiers.

Intelligent current limiter for a computing device

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.

Dynamic debuzzer for speakers

A mobile computing device includes a digital signal processor, a first speaker having a first sensitivity and a second speaker having a second sensitivity, where the second sensitivity is greater than the first sensitivity. The digital signal processor includes an audio signal manager that is configured to receive an audio signal having first and second channel signals, partition the first channel signal into a first high frequency signal and a first low frequency signal, partition the second channel signal into a second high frequency signal and a second low frequency signal, generate a mono low frequency signal based on the first and second low frequency signals, partition the mono low frequency signal into first and second mono low frequency signals based on an excursion limit of the second speaker, generate a first composite channel signal based on the first high frequency signal and the first mono low frequency signal for playback by the first speaker, and generate a second composite channel signal based on the second high frequency signal and the second mono low frequency signal for playback by the second speaker.

Management of low frequency components of an audio signal at a mobile computing device

A mobile device with orientation aware audio mapping capability is disclosed. The mobile device has an aux speaker, a loud speaker, a sensor for device orientation detection, and a processor (or processors) coupled to the sensor and the speakers. Depending on the device orientation, the processor sends a mapped audio output to the speakers. The mapped audio output may be a mono audio signal or a stereo audio signal. The stereo audio output signal may be a stereo audio output signal with a balanced or biased audio power distribution between the aux speaker and the loud speaker.

Orientation aware audio soundstage mapping for a mobile device

A method of reducing power consumed by an audio playback system includes: receiving a signal from a digital audio interface; comparing a sound pressure level (SPL) response of a first frequency band of the signal to a total SPL response of the signal, the first frequency band including frequencies lower than a selected frequency; and attenuating signal components in the first frequency band of the signal based upon the comparison of the SPL response of the first frequency band of the signal to the total SPL response of the signal.

Perceptual power reduction system and method

The invention relates to an electronic device that includes a wake-up system that operates at a substantially low power level and is applied to wake up the electronic device from a sleep mode. The wake-up system comprises a sound transducer that converts a received sound signal to an electrical signal and a keyword detection logic that preliminarily identifies a speech energy profile that corresponds to at least one of a plurality of keywords in a part of the electrical signal. In some embodiments, a keyword finder is further activated to identify with an enhanced accuracy whether the at least one keyword exists in the part of the electrical signal, and generates a wake-up control to activate a host of the electronic device from its sleep mode.

Always-on low-power keyword spotting

A system includes a plurality of channels, a parameter calculator, and an equalizer. Each channel receives a plurality of input signals that represent an input to a speaker. Each channel generates real and imaginary components of a transfer function of the speaker based on the plurality of input signals. The parameter calculator calculates a plurality of parameters of the speaker based on the real and imaginary components of the transfer function received from each channel. The equalizer adjusts the input to the speaker based on the parameters.

System and method for extracting parameters of a speaker without using stimulus

A system for echo cancellation includes a dynamic speaker management (DSM) module, a current/voltage sensing amplifier, a sound pressure level (SPL) model module and an echo canceller. The example DSM module is receptive to a far-end signal and is operative to develop a modified far-end signal and a plurality of parameter outputs. The example current/voltage sensing amplifier is coupled to the modified far-end signal and develops an amplifier output, a voltage (V) parameter output, and a current (I) parameter output. The example sound pressure level (SPL) model module is coupled to the plurality of parameter outputs of the of the DSM module and is operative to develop a predicted SPL. The example echo canceller module is responsive to the predicted SPL and to a near-end signal and operative to develop an echo-canceled output signal.

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Dublin, CA, United States of America

Vivek Prakash Nigam