Knowles Electronics, Inc.

Aziz Yurttas

Anders Svava Mortensen

Claus Erdmann Fürst

John Nielsen

Henrik Thomsen

Dibyendu Nandy

Oddy Nopporn Khamharn

Michael Deruginsky

Svetoslav Radoslavov Gueorguiev

Paul Fielding Smith

Svetslav Gueorguiev

The present disclosure relates generally to a microphone assembly. The microphone assembly has an acoustic activity detection mode of operation when the electrical circuit is clocked using an internal clock signal generator in the absence of an external clock signal at a host interface, and an electrical circuit of the microphone assembly is configured to provide an interrupt signal to the host interface upon detection of acoustic activity by the electrical circuit. The electrical circuit is configured to control the operating mode of the microphone assembly based on a frequency of the external clock signal in response to providing the interrupt signal and is configured to provide data representing the electrical signal to the host interface using the external clock signal received at the host interface.

Acoustic activity detecting microphone

An application specific integrated circuit (ASIC) is used with an acoustic device. An input clock signal is received. The frequency of the input clock signal is determined, and the frequency is indicative of one of a plurality of operational modes of the ASIC. Based upon the determined frequency, an amount current provided to one or more operational blocks of the ASIC is changed.

Apparatus and method for frequency detection

A driver, includes a driver block, a controller block, and a comparison block. The driver block includes an adjustable current source configured to produce a digital output stream. The controller block is coupled to the driver block. The comparison block is coupled to the driver block and the controller block. The comparison block is configured to compare the digital output stream to a reference value at a time delayed with respect to a master clock and based upon the comparison cause the controller block to adjust a strength of the driver block.

Slew rate control apparatus for digital microphones

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Copenhagen, Denmark

Aziz Yurttas