Electronic circuit for sensing disconnect or failure of a power

Details Electronic circuit for sensing disconnect or failure of a power Electronic circuit for sensing disconnect or failure of a power

1988-06-15

1989-12-12

Isen, Forester W.

Electrical audio signal processing systems and devices

Audio transducer protection circuitry

381 59, 381 96, 330298, 330207P, H03G 1100

Patent

active

048872989

ABSTRACT:
A detection circuit for detecting the failure or disconnection of a sense line in an audio processing system that provides an audio output signal that drives the input of an audio power amplifier. The audio power amplifier drives a speaker. The audio processing system includes an input for receiving a first feedback signal on a sense line from the output of the power amplifier. The audio processing system is responsive to the first feedback signal to control the amount of power provided to the input of the power amplifier and thus to the speaker. The detection circuit also receives the first feedback signal. The detection circuit further receives a second feedback signal from the output of the audio processing system prior to the input of the power amplifier. The magnitude of the second feedback signal is compared to the magnitude of the first feedback signal to determine whether the sense line is providing the first feedback signal from the output of the power amplifier. If the second feedback signal is present on the input to the detection circuit when the first feedback signal is not present on the input to the detection circuit from the sense line, the sense line may have failed or may have been disconnected. When this occurs, the detection circuit automatically activates a mute circuit to attenuate the output of the audio processing system so that the output of the power amplifier will not exceed the safe operating limits of the speaker.

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patent: 4723292 (1988-02-01), Taylor

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