Audio loudspeaker detection using back-EMF sensing

Details Audio loudspeaker detection using back-EMF sensing Audio loudspeaker detection using back-EMF sensing

2005-03-22

2005-03-22

Lee, Ping (Department: 2644)

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

Loudspeaker operation

C381S096000

Reexamination Certificate

active

06870934

ABSTRACT:
The presence or absence of a speaker connected to an output terminal of an audio system is determined based on the electro-generator properties of the speaker. The audio system includes an output amplifier coupled to the output terminal. The method includes driving the output amplifier with a predetermined drive signal sufficient to produce a predetermined speaker excursion if a speaker is connected to the output terminal. The output amplifier is then isolated from the output terminal. A signal at the output terminal is sensed after the output amplifier is isolated. The sensed signal is compared with a predetermined reference for determining whether a speaker back-EMF is present. A speaker detection signal is generated indicating absence of a speaker if the back-EMF is not present.

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patent: 19544658 (1997-03-01), None
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