Method and system for monitoring speaker temperature for speaker protection

摘要

A method of monitoring speaker temperature for speaker protection starts by generating a low level inaudible noise signal and injecting the low level inaudible noise signal in an audio signal. The voice coil resistance estimate that estimates a resistance of a voice coil of a speaker is then computed. The voice coil resistance estimate changes while the speaker is being driven by the audio signal that includes the low level inaudible noise signal. The temperature estimate is then computed based on the voice coil resistance estimate. The level of the audio signal may be adjusted based on the temperature estimate. Other embodiments are also described.

主权项

1. A method of monitoring speaker temperature for speaker protection comprising:
generating an inaudible noise signal, wherein generating the inaudible noise signal includes: generating a noise signal, and blocking a DC offset included in the noise signal using a first DC blocker to output a DC blocked noise signal; injecting the inaudible noise signal in an audio signal; computing a voice coil resistance estimate that estimates a resistance of a voice coil of a speaker, wherein the voice coil resistance estimate changes while the speaker is being driven by the audio signal that includes the inaudible noise signal; and computing a temperature estimate based on the voice coil resistance estimate.