Adaptive receiver

• US 10,338,883 B2
• Filed: 05/20/2016
• Issued: 07/02/2019
• Est. Priority Date: 05/22/2015
• Status: Active Grant

• Current Assignee: Cirrus Logic Incorporated
• Original Assignee: Cirrus Logic Incorporated
• Inventors: Risberg, Par Gunnars, Stahl, Carl Lennart, Toth, Landy
• Primary Examiner(s): Laekemariam, Yosef K
• Application Number:
  US15/575,244
• Publication Number:
  US 20180136899A1
• Time in Patent Office: 1,138 Days
• Field of Search: 381 26, 381 56, 381 74, 381 96, 381 85, 381103, 381104, 381108, 381121, 381300
• CPC Class Codes: G06F 3/165 Management of the audio stream, e.g. setting of volume, audio stream path
• CPC Class Codes: H04R 2400/01 Transducers used as a loudspeaker to generate sound aswell as a microphone to detect sound
• CPC Class Codes: H04R 2430/01 Aspects of volume control, not necessarily automatic, in sound systems
• CPC Class Codes: H04R 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04R 29/001 for loudspeakers H04R29/007 takes precedence
• CPC Class Codes: H04R 3/002 Damping circuit arrangements for transducers, e.g. motional feedback circuits
• CPC Class Codes: H04R 3/007 Protection circuits for transducers
• CPC Class Codes: H04R 3/04 for correcting frequency response

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.

Claims

1. A control system for rendering an audio stream on a speaker from one or more input signals, the control system comprising:

an estimator comprising one or more state estimating models, each state estimating model configured to accept at least one of one or more of the input signals and one or more feedback signals, and to generate one or more estimated states therefrom;

one or more of the state estimating models configured to estimate one or more proximity states, the proximity states related to one or more of an orientation, acoustic volume, an acoustic coupling of the speaker to a nearby object;

a control block comprising a control algorithm configured to accept one or more of the input signals and delayed versions thereof, and one or more of the proximity states and one or more signals generated therefrom, and to generate the audio stream therefrom; and

an excursion state estimating model, configured to estimate an excursion state of the speaker, the excursion state used to update the state estimating model configured to estimate one or more proximity states;

wherein the control system, and the speaker are comprised in a handset, the handset comprising regions including a mouthpiece and an ear piece, the speaker situated near the ear piece, further comprising one or more sensors to obtain one or more of the feedback signals, a first feedback signal relating to background noise in the vicinity of the speaker, between the speaker and the object, and/or in the vicinity of the ear piece, and a second feedback signal relating to background noise in the vicinity of the mouthpiece, and/or from a remote location, the control system configured to measure one or more differences between the first and second feedback signals, the differences used in the estimation of one or more of the proximity states.

2. The control system in accordance with claim 1, wherein proximity state estimating model includes an adaptive feed forward model.

3. The control system in accordance with claim 1, wherein the proximity state is reflective of an acoustic coupling between the speaker and the object, an acoustic leakage between the speaker and the object, an acoustic volume between the speaker and the object, an acoustic load on the speaker, an alignment between the speaker and the object, the proximity or distance of the speaker to the object, a tightness of fit between the speaker and the object, a state of cleanliness of the speaker, or a combination thereof.

4. The control system in accordance with claim 1, wherein the rendering is updated at a first rate, the control system comprises a feedback algorithm, the feedback algorithm coupled to a feedback sensor configured to generate at least a portion of the feedback signal, the feedback algorithm configured to update the proximity state estimating model, the proximity state estimating model updated at a substantially slow rate, compared with the first rate.

5. The control system in accordance with claim 4, wherein the feedback sensor is a microphone, a speaker impedance sensor, a current sensor, a voltage sensor, a coulomb counting sensor, a pressure sensor, a humidity sensor, an infrared proximity sensor, a thermal sensor, a colorimetric sensor, an imaging sensor, or a combination thereof.

6. The control system in accordance with claim 4, wherein the feedback sensor is a microphone, the microphone located in close proximity to both the speaker and the object.

7. The control system in accordance with claim 6, wherein the microphone is located substantially between the speaker and the object, or next to the speaker so as to interface with an acoustic volume there between.

8. The control system in accordance with claim 6, wherein the control system, the microphone and the speaker are comprised in a handset, the handset comprising regions including a mouthpiece and an ear piece, the microphone and the speaker situated near the ear piece.

9. The control system in accordance with claim 4, wherein the feedback sensor is a microphone, the microphone located substantially far away from the speaker and/or the object.

10. The control system in accordance with claim 9, wherein the control system, the microphone and the speaker are comprised in a handset, the handset comprising regions including a mouthpiece and an ear piece, the microphone situated near the mouthpiece, and the speaker situated near the ear piece.

11. The control system in accordance with claim 1, wherein the speaker may be operated in a sensing mode, the coulomb transfer to/from, current to/from, and/or voltage across the speaker providing at least a portion of the feedback signal.

12. The control system in accordance with claim 4, wherein the control system is coupled to a diagnostic speaker, the control system configured to render a diagnostic audio stream on the diagnostic speaker, the feedback sensor configured to generate at least a portion of the feedback signal related to the diagnostic audio stream, the feedback algorithm configured to analyze the diagnostic audio stream and the feedback signal to calculate the proximity state.

13. The control system in accordance with claim 1, the control system comprising an excursion state estimating model, configured to estimate an excursion state of the speaker, the excursion state used to update the proximity state estimating model.

14. The control system in accordance with claim 13, wherein the excursion state estimating model is an adaptive feedforward model.

15. The control system in accordance with claim 1, wherein at least a portion of the feedback signal is related to a background noise level in the vicinity of the speaker and/or the object, the control system configured to adjust the audiostream in accordance with one or more characteristics of the background noise.

16. The control system in accordance with claim 1, wherein the feedback signal is related to a background noise level in the vicinity of the speaker, the changes in background noise level used in estimating one or more of the proximity states.

17. The control system in accordance with claim 1, wherein the control system is coupled to a diagnostic speaker, the control system configured to render a diagnostic audio stream on the diagnostic speaker, the feedback sensor configured to generate at least a portion of the feedback signal related to the diagnostic audio stream, the feedback algorithm configured to analyze the diagnostic audio stream and the feedback signal to calculate the proximity state, and wherein the control system is configured to coordinate production of the diagnostic signals, and capture of the feedback signals, such that the feedback signals are related to the diagnostic signals.

18. A handset comprising:

a speaker configured to render an audio stream for a user;

a control system coupled to the speaker, wherein the control system comprises;

an estimator comprising one or more state estimating models, each state estimating model configured to accept at least one of one or more of the input signals and one or more feedback signals, and to generate one or more estimated states therefrom;

one or more of the state estimating models configured to estimate one or more proximity states, the proximity states related to one or more of an orientation, acoustic volume, and acoustic coupling of the speaker to a nearby object;

a control block comprising a control algorithm configured to accept one or more of the input signals and delayed versions thereof, and one or more of the proximity states and one or more signals generated therefrom, and to generate the audio stream therefrom; and

an excursion state estimating model, configured to estimate an excursion state of the speaker, the excursion state used to update the state estimating model configured to estimate one or more proximity states, and wherein;

the control system is configured to accept one or more input signals and to produce the audio stream or signal related thereto; and

the handset comprises regions including a mouthpiece and an ear piece, the speaker is situated near the ear piece, further comprising one or more sensors to obtain one or more of the feedback signals, a first feedback signal relating to background noise in the vicinity of the speaker, between the speaker and the object, and/or in the vicinity of the ear piece, and a second feedback signal relating to background noise in the vicinity of the mouthpiece, and/or from a remote location, the control system is configured to measure one or more differences between the first and second feedback signals, the differences used in the estimation of one or more of the proximity states.

19. The handset according to claim 18, comprising a wireless connection to a cloud-based database, the audio stream, proximity estimating model, object images, feedback signal, and/or one or more signals related thereto stored in the cloud-based database.