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US 11,425,498 B2Granted
Speaker amplifier
AssigneeTexas Instruments Incorporated
InventorDing Wei
Life of this patent
Estimating the term…
Abstract
A method of regulating power supply to a speaker and a system for regulating power supply to a speaker comprising a generating of a low frequency signal output to the speaker, sensing a current and a voltage of the speaker after the low frequency signal is output to the speaker, measuring an impedance of the speaker based on the current and voltage, determining a temperature of the speaker and comparing with a threshold value, and lowering a power supply to the speaker where the temperature is above the threshold value.
Claims23
A method of supplying power to a speaker comprising,
- generating a signal with a frequency lower than a frequency of an audio signal,
- providing the lower frequency signal to a speaker;
- measuring current through and voltage across the speaker based on the lower frequency signal;
- determining an impedance of the speaker based on the measured current and voltage;
- and
- regulating power supplied to the speaker based on the impedance.
3 more elements
A speaker power regulating system comprising,
- an application processor coupled to a speaker;
- a power supply coupled to the speaker;
- a current sensor coupled to the speaker;
- a voltage sensor coupled to the speaker;
- and
- a speaker impedance measuring module coupled to the current sensor and the voltage sensor,
- wherein the application processor is configured to output an impedance measuring signal to the speaker;
- the current sensor is configured to sense current of the speaker while the impedance measuring signal is output to the speaker;
- the voltage sensor is configured to sense voltage of the speaker while the impedance measuring signal is output to the speaker;
- the speaker impedance measuring module is configured to determine a value indicative of an impedance of the speaker based on a current sensed by the current sensor and a voltage sensed by the voltage sensor;
- and
- the application processor is configured to regulate a power output of the power supply based on the value determined by the speaker impedance measuring module.
9 more elements
An integrated circuit, comprising:
- a power supply configured to be coupled to a speaker;
- a current sensor configured to be coupled to the speaker;
- a voltage sensor configured to be coupled to the speaker;
- and
- a speaker impedance measuring module coupled to the current sensor and the voltage sensor,
- wherein:
- the current sensor is configured to sense current of the speaker while an impedance measuring signal output to the speaker;
- the voltage sensor is configured to sense voltage of the speaker while the impedance measuring signal is output to the speaker;
- the speaker impedance measuring module is configured to determine a value indicative of an impedance of the speaker based on a current sensed by the current sensor and a voltage sensed by the voltage sensor;
- wherein the speaker impedance measuring module includes a comparator having a first input, a second input, and an output, wherein the first input is coupled to the current sensor and the second input is coupled to the voltage sensor, and wherein the comparator generates a signal on the output of the comparator based on a comparison of the signals on its first and second inputs.
7 more elements
An integrated circuit, comprising:
- a power supply configured to be coupled to a speaker;
- a current sensor configured to be coupled to the speaker;
- a voltage sensor configured to be coupled to the speaker;
- and
- a speaker impedance measuring module coupled to the current sensor and the voltage sensor,
- wherein:
- the current sensor is configured to sense current of the speaker while an impedance measuring signal output to the speaker;
- the voltage sensor is configured to sense voltage of the speaker while the impedance measuring signal is output to the speaker;
- the speaker impedance measuring module is configured to determine a value indicative of an impedance of the speaker based on a current sensed by the current sensor and a voltage sensed by the voltage sensor;
- wherein the speaker impedance measuring module includes a subtractor having a first input, a second input, and an output, wherein the first input is coupled to the current sensor and the second input is coupled to the voltage sensor, and wherein the subtractor generates a signal on the output of a comparator based on a difference between the signals on its first and second inputs.
7 more elements
A speaker system comprising:
- a speaker;
- an integrated circuit, comprising:
- a power supply coupled to a speaker;
- a current sensor coupled to the speaker;
- a voltage sensor coupled to the speaker;
- and
- a speaker impedance measuring module coupled to the current sensor and the voltage sensor,
- wherein:
- the current sensor is configured to sense current of the speaker while an impedance measuring signal output to the speaker;
- the voltage sensor is configured to sense voltage of the speaker while the impedance measuring signal is output to the speaker;
- the speaker impedance measuring module is configured to determine a value indicative of an impedance of the speaker based on a current sensed by the current sensor and a voltage sensed by the voltage sensor;
- wherein the speaker impedance measuring module includes a subtractor having a first input, a second input, and an output, wherein the first input is coupled to the current sensor and the second input is coupled to the voltage sensor, and wherein the subtractor generates a signal on the output of a comparator based on a difference between the signals on its first and second inputs.
9 more elements
Dependencies are inferred from the claim text.