Audio speaker protection system and method
AssigneeSTMicroelectronics (Alps) SAS
InventorsChristian Fraisse, Angelo Nagari
Life of this patent
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Abstract
An audio device includes an audio amplifier configured to receive an input signal and generate a differential output signal. A first signal combiner circuit is configured to generate a time-convolution signal of an analog current signal and an analog voltage signal. The analog current signal corresponds to a current at the differential output signal, and the analog voltage signal corresponds to a voltage across the differential output signal. A second signal combiner circuit is configured to subtract the generated time-convolution signal from the input signal.
Claims23
An audio device comprising:
- an audio amplifier configured to receive an input signal and generate a differential output signal;
- a first signal combiner circuit configured to generate a time-convolution signal of an analog current signal and an analog voltage signal, wherein the analog current signal corresponds to a current at the differential output signal, and wherein the analog voltage signal corresponds to a voltage across the differential output signal;
- and
- a second signal combiner circuit configured to subtract the generated time-convolution signal from the input signal.
A method comprising:
- amplifying an input signal to generate a differential output signal;
- generating a second signal that corresponds to a time-convolution of an analog current signal and an analog voltage signal, wherein the analog current signal corresponds to a current at the differential output signal, and wherein the analog voltage signal corresponds to a voltage across the differential output signal;
- and
- subtracting the second signal from the input signal.
An apparatus comprising:
- an audio amplifier having an audio input terminal and a differential output terminal;
- a current sense circuit coupled to the differential output terminal of the audio amplifier;
- a voltage sense circuit coupled across the differential output terminal of the audio amplifier;
- a first signal combiner circuit having a first input coupled to the current sense circuit and a second input coupled to the voltage sense circuit;
- and
- a second signal combiner circuit having a positive input coupled to the audio input terminal and a negative input coupled to an output of the first signal combiner circuit, the second signal combiner circuit having an output coupled to the audio input terminal of the audio amplifier.
Dependencies are inferred from the claim text.