Integrated speaker supervision and alarm system

Details Integrated speaker supervision and alarm system Integrated speaker supervision and alarm system

1992-07-13

1994-09-06

Isen, Forester W.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

381 82, 381 55, H04B 300

Patent

active

053455100

ABSTRACT:
A system for monitoring the integrity of speakers and their associated wires using the pair of audio wires without disconnecting the speaker from the audio source. A direct current is injected onto the audio signal path and directed via a high impedance path through the speaker coil while any audio signals present drive the speaker through a low impedance path. The magnitude of the direct current is then evaluated at a central switching location and based on the value of the current, the status of the signal path is known to be either a good path, an open path, a shorted path or a grounded path. Alarm initiating devices may be connected to the wire pair and can be connected in such a way that the current on the wire pair indicates the status of the alarm indicating devices distinct from the currents corresponding to signal path integrity.

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