A system and method including receiving an activity signal from a detection unit, the activity signal indicative of detected activity, responsive to the received activity signal exceeding a predetermined threshold, switching a digital microphone from a default low-power mode to active mode, and a pre-determined period of time after switching the digital microphone to active mode, switching the digital microphone back to the default low-power mode.

A camera system with image and audio capture capabilities is configured to protect the internal audio components from the external environment. The camera system includes an internal audio assembly with a microphone and an audio circuit board. The audio circuit board is structured such that a gap exists within the board that allows transmission of sound waves from external the environment to the microphone. The audio assembly also includes a compressible annulus, a support annulus, and a waterproof membrane coupled by a support structure. The waterproof membrane protects the internal components from moisture while still allowing transmission of sound waves. The support structure, compressible annulus, support annulus, and audio circuit board are structured such that a gap exists above the microphone and underneath the waterproof membrane.

Electro acoustic volume measurement of a gas in a housing space may be performed using a hollow tube having a first end and a second end. A speaker is arranged to emit audio signals through the hollow tube. A first microphone of at least two microphones is located at the first end of the hollow tube, while a second microphone is located a defined distance from the first microphone within the hollow tube. A voltage-controlled oscillator controls the frequency of the audio signals to a resonance frequency where signals of the first microphone and the second microphone are 90 degrees out of phase while the first end of the hollow tube is located within the housing. The resonance frequency indicates a volume of the gas. The resonance frequency may be temperature-adjusted, or the volume may be temperature-adjusted.

Voice-controlled devices that include one or more speakers for outputting audio. In some instances, the device includes at least one speaker within a cylindrical housing, with the speaker aimed or pointed away from a microphone coupled to the housing. For instance, if the microphone resides at or near the top of the cylindrical housing, then the speaker may point downwards along the longitudinal axis of the housing and away from the microphone. By pointing the speaker away from the microphone, the microphone will receive less sound from the speaker than if the speaker were pointed toward the microphone). Because the voice-controlled device may perform speech recognition on audio signals generated by the microphone, less sound from the speaker represented in the audio signal may result in more accurate speech recognition, and/or a lesser need to perform acoustic echo cancelation (AEC) on the generated audio signals.

An audio processing device that includes a first ADC, a second ADC, a register and a processing circuit is provided. The processing circuit executes a first audio application program corresponding to a first analog input audio stream and assigns the first analog input audio stream to the first ADC. When the processing circuit identifies that a second audio application program also corresponds to the first analog input audio stream, the processing circuit control the first ADC to process the first analog input audio stream. When second audio application program corresponds to a second analog input audio stream, the processing circuit assigns the second analog input audio stream to the second ADC for processing such that the first and the second ADCs process the first and the second analog input audio stream respectively.

An audio processing device that includes a first ADC, a second ADC, a register and a processing circuit is provided. The processing circuit executes a first audio application program corresponding to a first analog input audio stream and assigns the first analog input audio stream to the first ADC. When the processing circuit identifies that a second audio application program also corresponds to the first analog input audio stream, the processing circuit control the first ADC to process the first analog input audio stream. When second audio application program corresponds to a second analog input audio stream, the processing circuit assigns the second analog input audio stream to the second ADC for processing such that the first and the second ADCs process the first and the second analog input audio stream respectively.

A microphone apparatus including a MEMS transducer, an acoustic activity detector, a local oscillator, and an external-device interface standardized for compatibility with devices from different manufacturers is disclosed. The microphone apparatus has a first mode of operation during which the apparatus is clocked by the internal clock signal when the acoustic activity detector processes digital data for acoustic activity, and a second mode of operation during which the microphone apparatus is clocked by an external clock signal received at the external-device interface after voice activity is detected by the acoustic activity detector.

The various implementations described herein include methods, devices, and systems for calibrating LED(s). In one aspect, a method includes: (1) obtaining a desired color value for each LED of a plurality of LEDs to be calibrated; (2) obtaining image information from an image sensor, the image information corresponding to operation of the plurality of LEDs; and (3) generating calibration information for each LED of the plurality of LEDs based on the desired color value for the LED and the obtained image information.

Examples described herein relate to systems, apparatuses, and methods for a microphone device that includes a microphone configured to output sound data signals, a first circuit board configured to perform audio analytics on the sound data signals, a second circuit board configured to extract power for powering the first circuit board, a housing configured to contain the microphone, the first circuit board, and the second circuit board, and an Ethernet interface configured to connect the second circuit board to a security system through an Ethernet connection.

A camera with image and audio capture capabilities is configured to protect the internal audio components from the external environment. The camera includes a housing that allows passage of sound waves via a port from an external area of the camera to an internal area of the camera. The camera includes a circuit board with an opening and a microphone attached to a first surface of the circuit board adjacent to the opening. The camera includes a compressible spacer attached to a second surface of the circuit board. The second surface of the circuit board may be diametrically opposite to the first surface. The camera includes a waterproof membrane between the housing and the compressible spacer.