US 2022/0092967 A1 · AUDIO RISER ACTIVE ELECTRICAL SUPERVISION

Abstract

An audio riser active electrical supervision system includes a high-voltage audio alert system connected to a riser circuit. The high-voltage audio alert system disconnects a high-voltage analog signal from the riser circuit when the audio riser active electrical supervision system operates in a standby mode, and connects the high-voltage analog signal to the riser circuit when the audio riser active electrical supervision system operates in an active alert mode. A plurality of isolator modules operate in a closed state that connects a circuit node to the riser circuit and an open state that disconnects the respective circuit node from the riser circuit. A riser supervision circuit is connected to at least one isolator module to detect a circuit fault on the riser circuit when the audio riser active electrical supervision system operates in the standby mode and the active alert mode.

Claims6

Dependent claims

A riser supervision circuit installed in a riser circuit of an audio riser active electrical supervision system, the riser supervision circuit comprising:

a direct current (DC) voltage supply configured to apply a DC voltage to the riser circuit;
an AC coupling device electrically connected to the riser circuit between an analog input of the riser circuit and the DC voltage supply, the AC coupling device configured to superimpose the DC voltage with a high-voltage analog signal applied to the analog input;
and
a low pass filter including an input connected to the riser circuit and an output connected to a fault detection circuit path that is separated from the riser circuit,
wherein the low pass filter extracts the DC voltage supply from the riser circuit and outputs the DC voltage to the fault detection circuit path while blocking analog audio signals from the fault detection circuit path.

2 more elements

Dependencies are inferred from the claim text.

Audio riser active electrical supervision

Life of this patent

Audio riser active electrical supervision

Life of this patent

Abstract

Claims6