Speaker supervision in a public address system

Details Speaker supervision in a public address system Speaker supervision in a public address system

1975-06-26

1976-11-02

Olms, Douglas W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

1791753R, 179 1MN, 340409, H04R 2900

Patent

active

039899080

ABSTRACT:
Apparatus and technique for supervising a public address system such that any faults on the lines connected to speakers in the system or any faults within the speaker structures can be detected and suitable corrective action can be taken. To accomplish this purpose, only three wires or lines need be taken or extended to each zone within the public address system.

REFERENCES:
patent: 3161731 (1964-12-01), Seeley
patent: 3656158 (1972-04-01), Goodwater
patent: 3849772 (1974-11-01), Burnett
patent: 3855415 (1974-12-01), Fox et al.
patent: 3912883 (1975-10-01), Goodyear

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