Active audio transducer protection

摘要

This document discusses, among other things, apparatus and methods for providing audio transducer protection. In an example, an audio protection circuit can include a first comparator configured to compare peak power information of a drive signal of an amplifier of an audio system with a first threshold, a limiter circuit configured to limit an input of the amplifier if the peak power information of the drive signal exceeds the first threshold, and a second comparator configured to compare average power information of the drive signal with a second threshold and to provide an output signal configured to modulate a gain of a pre-amplifier of the audio system using the comparison.

主权项

1. An audio circuit comprising:
a first amplifier configured to receive an input audio signal and to provide an amplified audio signal; a power amplifier configured to receive the amplified audio signal and to provide a drive signal to a speaker; a power monitoring circuit coupled to an output of the power amplifier, the power monitoring circuit configured to provide peak power information and average power information of the drive signal; and a protection circuit configured to modulate a gain of the first amplifier using the average power information and a first threshold and to limit an amplitude of the amplified audio signal using the peak power information and a second threshold.