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US 8,265,294 B2Granted
Public address system utilizing power transmission medium communication
AssigneeRobert Bosch GmbH
InventorsBertus Tjalsma, Alex Jonkman
Life of this patent
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Abstract
A public address system includes at least one monitoring device, a transmission medium and at least one level monitoring device. The monitoring device is connected to the transmission medium and powered by an AC voltage with a supply frequency present on the transmission medium. The monitoring device receives or transmits or transmits and receives a communication signal utilizing a carrier frequency upon the transmission medium. The carrier frequency is different from the supply frequency and the level monitoring device is adapted to monitor the level of the AC voltage.
Claims16
Public address system, comprising
- at least one monitoring device,
- a transmission medium,
- at least one level monitoring device;
- and
- a microprocessor that operates in an operational mode and in a sleep mode, wherein the microprocessor is programmed to operate in the sleep mode during a time in which there is no communication;
- wherein the monitoring device is connected to the transmission medium, and is powered by an AC voltage with a supply frequency present on the transmission medium,
- wherein the monitoring device receives or transmits or transmits and receives a communication signal utilising a carrier frequency upon the transmission medium,
- wherein the carrier frequency is different from the supply frequency, and
- wherein the level monitoring device is adapted to monitor the level of the AC voltage.
6 more elements
Dependencies are inferred from the claim text.