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Cirrus Logic International Semiconductor Ltd
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Cirrus Logic International Semiconductor Ltd
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Priority claimed from US17/549,399external-prioritypatent/US11908310B2/en
Application filed by Cirrus Logic International Semiconductor LtdfiledCriticalCirrus Logic International Semiconductor Ltd
Publication of GB202318605D0publicationCriticalpatent/GB202318605D0/en
Publication of GB2621801ApublicationCriticalpatent/GB2621801A/en
B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
B06B1/0207—Driving circuits
B06B1/0215—Driving circuits for generating pulses, e.g. bursts of oscillations, envelopes
G—PHYSICS
G06—COMPUTING OR CALCULATING; COUNTING
G06F—ELECTRIC DIGITAL DATA PROCESSING
G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
G06F3/016—Input arrangements with force or tactile feedback as computer generated output to the user
G—PHYSICS
G10—MUSICAL INSTRUMENTS; ACOUSTICS
G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03F—AMPLIFIERS
H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
H03F1/32—Modifications of amplifiers to reduce non-linear distortion
H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03F—AMPLIFIERS
H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03F—AMPLIFIERS
H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
H03F3/187—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only in integrated circuits
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03F—AMPLIFIERS
H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
H03F3/217—Class D power amplifiers; Switching amplifiers
H03F3/2175—Class D power amplifiers; Switching amplifiers using analogue-digital or digital-analogue conversion
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03G—CONTROL OF AMPLIFICATION
H03G3/00—Gain control in amplifiers or frequency changers
H03G3/20—Automatic control
H03G3/30—Automatic control in amplifiers having semiconductor devices
H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03F—AMPLIFIERS
H03F2200/00—Indexing scheme relating to amplifiers
H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
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Engineering & Computer Science (AREA)
Power Engineering (AREA)
Physics & Mathematics (AREA)
Multimedia (AREA)
General Engineering & Computer Science (AREA)
Theoretical Computer Science (AREA)
General Physics & Mathematics (AREA)
Human Computer Interaction (AREA)
Acoustics & Sound (AREA)
Electromagnetism (AREA)
Mechanical Engineering (AREA)
Nonlinear Science (AREA)
Microelectronics & Electronic Packaging (AREA)
User Interface Of Digital Computer (AREA)
Burglar Alarm Systems (AREA)
Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
1. A method comprising: receiving, by a transducer driving system, a first signal for driving an amplifier that drives an electromagnetic load; receiving, by the transducer driving system, a second signal driven by the amplifier in order to control a feedback loop of the transducer driving system; detecting unexpected spectral content in the second signal; declaring an indicator event based on the detected unexpected spectral content; determining whether the indicator event occurs in an undesired pattern; in response to the indicator event occurring in the undesired pattern, modifying a behavior of the transducer driving system.
2. The method of Claim 1, wherein modifying the behavior of the transducer driving system comprises modifying a negative impedance of the feedback loop.
3. The method of Claim 1, wherein modifying the behavior of the transducer driving system comprises modifying a negative impedance of the feedback loop for a duration of time which is a function of the undesired pattern .
4. The method of Claim 3, wherein the negative impedance is modified for a fixed period of time.
5. The method of Claim 3, wherein the negative impedance is modified for a dynamically-adjustable time which is a function of a history of indicator events.
6. The method of any of Claims 1-5, wherein modifying the behavior of the transducer driving system comprises tuning a gain of a negative impedance of the feedback loop.
7. The method of Claim 6, further comprising reducing the gain of the negative impedance to limit frequency of occurrence of indicator events.
8. The method of any of Claims 1-7, wherein modifying the behavior of the transducer driving system comprises modifying a signal gain of the first signal.
9. The method of Claim 8, further comprising reducing the signal gain to limit frequency of occurrence of instability events.
10. A method comprising: receiving, by a transducer driving system, a first signal for driving an amplifier that drives an electromagnetic load; receiving, by the transducer driving system, a second signal driven by the amplifier in order to control a feedback loop of the transducer driving system; detecting unexpected spectral content in the second signal; in response to detecting the unexpected spectral content, modifying a system behavior of the transducer driving system by: monitoring the unexpected spectral content and the second signal for patterns that identify a physical damage of the electromagnetic load; and modifying a signal gain applied to the first signal to protect the transducer driving system.
11. The method of Claim 10, wherein the patterns comprise a correlation between unexpected spectral content events and signal peaks of the second signal and the method further comprises dynamically modifying the signal gain to reduce the signal peaks.
12. The method of Claim 10 or 11, wherein the patterns comprise a correlation between instability events and a signal duration of the second signal; and the method further comprises dynamically modifying the signal gain to reduce signal strength for long-duration signals.
13. A transducer driving system, comprising: a driver output for driving an amplifier that drives an electromagnetic load; a feedback input for receiving a signal driven by the amplifier in order to control a feedback loop of the transducer driving system; and an unexpected spectral content detector and controller subsystem configured to: detect unexpected spectral content in the signal; declare an indicator event based on the detected unexpected spectral content; determine whether the indicator event occurs in an undesired pattern; and in response to the indicator event occurring in the undesired pattern, modify a behavior of the transducer driving system.
14. The transducer driving system of Claim 13, wherein modifying the behavior of the transducer driving system comprises modifying a negative impedance of the feedback loop.
15. The transducer driving system of Claim 14, wherein modifying the behavior of the transducer driving system comprises modifying the negative impedance of the feedback loop for a duration of time which is a function of the undesired pattern.
16. The transducer driving system of Claim 15, wherein the negative impedance is modified for a fixed period of time.
17. The transducer driving system of Claim 15, wherein the negative impedance is modified for a dynamically-adjustable time which is a function of a history of indicator events.
18. The transducer driving system of any of Claims 13-17, wherein modifying the behavior of the transducer driving system comprises tuning a gain of a negative impedance of the feedback loop.
19. The transducer driving system of Claim 18, wherein the unexpected spectral content detector and controller subsystem is further configured to reduce the gain of the negative impedance to limit frequency of occurrence of indicator events.
20. The transducer driving system of any of Claims 13-19, wherein modifying the behavior of the transducer driving system comprises modifying a signal gain of a first signal.
21. The transducer driving system of Claim 20, wherein the unexpected spectral content detector and controller subsystem is further configured to reduce the signal gain to limit frequency of occurrence of instability events.
22. A transducer driving system comprising: a driver output for driving an amplifier that drives an electromagnetic load; a feedback input for receiving a first signal driven by the amplifier in order to control a feedback loop of the transducer driving system; and an unexpected spectral content detector and controller subsystem configured to: detect unexpected spectral content in the signal; and in response to detecting the unexpected spectral content, modify a system behavior of the transducer driving system by: monitoring the unexpected spectral content and a second signal for patterns that identify a physical damage of the electromagnetic load; and modifying a signal gain applied to the first signal to protect the transducer driving system .
23. The transducer driving system of Claim 22, wherein the patterns comprise a correlation between unexpected spectral content events and signal peaks of the second signal and the method further comprises dynamically modifying the signal gain to reduce the signal peaks.
24. The transducer driving system of Claim 22 or 23, wherein the patterns comprise a correlation between instability events and a signal duration of the second signal; and the method further comprises dynamically modifying the signal gain to reduce signal strength for long-duration signals.
GB2318605.9A2021-06-222022-06-13Methods and systems for detecting and managing unexpected spectral content in an amplifier systemPendingGB2621801A (en)
Method for protecting alarm errors in ultrasonic obstacle detection for a vehicle and Ultrasonic Obstacle Detection Device for protecting alarm errors in a vehicle
Method and apparatus for airborne-sound acoustic monitoring of an exterior and/or an interior of a vehicle, vehicle and computer-readable storage medium