Adaptive receiver
AssigneeCirrus Logic, Inc.
InventorsPär Gunnars Risberg, Carl Lennart Ståhl, Landy Toth
Life of this patent
Estimating the term…
Abstract
A nonlinear control system and a speaker protection system are disclosed. In particular, a control system for adapting an audio output from a speaker in the proximity of an object is disclosed. The controller is configured to accept one or more input signals, and one or more estimated states produced by the model to produce one or more control signals. A speaker protection system and a quality control system are disclosed. More particularly, a system for clamping the input to a speaker dependent upon an estimate of the proximity, acoustic volume, and/or acoustic coupling of the speaker to a nearby object is disclosed.
Claims47
A system for determining a proximity state relating to a proximity of a speaker from an ear of a user, the system comprising:
- an audio path configured to deliver an audio signal comprising a diagnostic signal to the speaker;
- and
- proximity estimator circuitry configured to:
- receive a feedback signal from a feedback microphone configured to monitor the output of the speaker in the vicinity of the speaker, wherein the feedback signal is based on the diagnostic signal;
- analyze the diagnostic signal and the feedback signal to calculate the proximity state using changes in background noise level;
- estimate one or more characteristics of the background noise level, wherein the one or more characteristics comprise one or more of an amplitude, power level, spectrum low frequency component, high frequency component, noise in an audio band, and noise in a voice band of the background noise level;
- set a control parameter relating to one or more characteristics;
- and
- calculate the proximity state based on the control parameter.
A system for determining a proximity state relating to a proximity of a speaker from an ear of a user, the system comprising:
- an audio path configured to deliver an audio signal comprising a diagnostic signal to the speaker;
- and
- proximity estimator circuitry configured to:
- receive a feedback signal from a feedback microphone configured to monitor the output of the speaker in the vicinity of the speaker, wherein the feedback signal is based on the diagnostic signal;
- analyze the diagnostic signal and the feedback signal to calculate the proximity state;
- and
- predict an acoustic transfer function between the speaker and the feedback microphone using an adaptive algorithm.
A system for determining a proximity state relating to a proximity of a speaker from an ear of a user, the system comprising:
- an audio path configured to deliver an audio signal comprising a diagnostic signal to the speaker;
- and
- proximity estimator circuitry configured to:
- receive a feedback signal from a feedback microphone configured to monitor the output of the speaker in the vicinity of the speaker, wherein the feedback signal is based on the diagnostic signal;
- analyze the diagnostic signal and the feedback signal to calculate the proximity state;
- predict a parametric relationship related to the proximity state;
- and
- update a control algorithm based on the parametric relationship so as to adjust the audio signal during use.
A system for determining a proximity state relating to a proximity of a speaker from an ear of a user, the system comprising:
- an audio path configured to deliver an audio signal comprising a diagnostic signal to the speaker;
- and
- proximity estimator circuitry configured to:
- receive a feedback signal from a feedback microphone configured to monitor the output of the speaker in the vicinity of the speaker, wherein the feedback signal is based on the diagnostic signal;
- analyze the diagnostic signal and the feedback signal to calculate the proximity state;
- and
- adapt the audio signal based on the proximity state and a deep learning algorithm.
A system for determining a proximity state relating to a proximity of a speaker to an object, the system comprising:
- an input configured to receive a feedback signal generated by a feedback microphone located between the speaker and the object, wherein the feedback signal is influenced by the proximity of the speaker to the object;
- and
- proximity estimating circuitry configured to:
- assess a coupling between the speaker and the feedback microphone using a feedback algorithm, and
- generate a proximity state reflective of the proximity of the speaker to the object based on the feedback signal and the coupling.
A proximity detector comprising:
- an input configured to receive an audio signal generated by a microphone configured to sample an output of a speaker, wherein the microphone is a feedback microphone;
- a processor configured to determine a characteristic of the audio signal and determine a proximity of the speaker to an object based on an analysis of the characteristic;
- a second input configured to receive an ambient signal generated by a feedforward microphone configured to sample an ambient noise;
- and
- wherein the processor is further configured to determine a second characteristic of the ambient signal and determine the proximity of the speaker to the object based on an analysis of the second characteristic.
A method comprising:
- receiving an audio signal generated by a microphone configured to sample an output of a speaker, wherein the microphone is a feedback microphone;
- determining a characteristic of the audio signal;
- determining a proximity of the speaker to an object based on an analysis of the characteristic;
- receiving an ambient signal generated by a feedforward microphone configured to sample an ambient noise;
- determining a second characteristic of the ambient signal;
- and
- determining the proximity of the speaker to the object based at least in part on an analysis of the second characteristic.
Dependencies are inferred from the claim text.