PLC intercom/monitor
US7199706B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 22, 2005 |
| Grant date | Apr 3, 2007 |
| Priority date | — |
| Expiry date | Nov 20, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2601
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A digital intercom device consistent with certain embodiments uses power line communication (PLC). A power line interface connects to a power line serving as a communication medium. An audio codec is coupled to the power line interface for encoding and decoding digital data to and from data suitable for use by the power line interface. A digital to analog converter receives digital decoded data from the codec and converts the digital coded data to a received analog signal. A receive audio amplifier amplifies the received analog signal to a level adequate to drive a speaker. A transmit audio amplifier amplifies a transmit audio signal and provides an amplified transmit audio signal as an output. An analog to digital converter converts the amplified transmit audio signal to a digital representation thereof and passes the digital representation to the codec. A control processor controls operation of the interface and the audio codec. A switch interface receiving a signal from a push-to-talk switch, which causes the codec to encode the digital representation and the power line interface to place an OFDM modulated version of the digital representation onto the power line. This abstract …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.