Silicon Laboratories Inc.

Cirrus Logic Inc.

Shahram Tadayon

Xiaodong Wang

Axel Thomsen

John M Khoury

Alan Lee Westwick

Jinwen Xiao

Clayton H Daigle

Pavel Konecny

Jon David Hendrix

K Joshua Bodon

Brian Thornock

Aaron Treptow

Peter Vancorenland

Wade Robert Gillham

Daniel Mark Thompson

A method may include receiving a user trigger signal indicating a user desire to update characteristics of an adaptive filter, receiving an error microphone signal indicative of the output of the transducer and the ambient audio sounds at the transducer, wherein the transducer reproduces both a source audio signal for playback to a listener and an anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the transducer, implementing the adaptive filter having a response that generates the anti-noise signal to reduce the presence of the ambient audio sounds in the error microphone signal, determining an acoustic coupling of the transducer to an error microphone for producing the error microphone signal, and responsive to a change in the acoustic coupling, prompting a user to assert the user trigger signal to indicate user desire to update characteristics of the adaptive filter.

On-demand adaptive active noise cancellation system

On-demand adaptive active noise cancellation

An integrated circuit (IC) includes a plurality of pads adapted to send or receive signals, and a plurality of mixed signal interface blocks, each of which is coupled to a corresponding pad in the plurality of pads. Furthermore, each mixed signal interface block in the plurality of mixed signal interface blocks is adapted to be configurable to provide selected functionality independently of the other mixed signal interface blocks.

Apparatus for mixed signal interface circuitry and associated methods

In one implementation, a receiver may have an analog front end with an amplifier to receive a radio frequency (RF) signal and a mixer to downconvert the signal to a baseband signal. Then, a demodulator may receive the baseband signal and obtain an audio signal therefrom. Still further, a controller may be coupled to receive a control signal corresponding to a variable impedance level, and control a local oscillator coupled to the mixer responsive to the control signal. The variable impedance may be controlled by a user to tune to the channel.

Mechanical tuning of a radio

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Austin, TX, United States of America

Shahram Tadayon