초록 ▼

The inventor discloses a bidirectional communication system for electric power load management and distribution automation application, and the like, wherein outgoing control signals to a plurality of remotely located receivers and transmitters are sent using an existing standard AM broadcast statio

The inventor discloses a bidirectional communication system for electric power load management and distribution automation application, and the like, wherein outgoing control signals to a plurality of remotely located receivers and transmitters are sent using an existing standard AM broadcast station using small angle subaudible quadrature modulation. The broadcast signal is detected by narrowband synchronous receivers phase-locked to the carrier component of the broadcast station. The radio frequencies of the plurality of reverse link transmitters are closely spaced and synthesized from frequency of said broadcast carrier and their time of transmission, digital bit streams, and message frames are all synchronized from the broadcast signal. The broadcast station thereby orchestrates all communication activity to and from the plurality of remote locations to optimize traffic flow and maximize a priori information to all components to significantly increase reliability. A unique fast Fourier transform processor synchronized by the broadcast station is employed in the central receiver to detect back link transmission.

대표청구항 ▼

A radio communication system for selectively addressing and controlling a plurality of remotely located apparatus comprising in combination: (A) central controller means adapted to generate address & control tone code selection signals for transmission to a local AM radio broadcast station, (B) a lo

A radio communication system for selectively addressing and controlling a plurality of remotely located apparatus comprising in combination: (A) central controller means adapted to generate address & control tone code selection signals for transmission to a local AM radio broadcast station, (B) a local AM radio broadcast station adapted to generate tone coded signals derived from its master oscillator by frequency divider means and adapted to receive and broadcast the tone code selections received from said broadcasted radio frequency carrier at small angle subaudible rates that do not suppress and spread its normally unused residual carrier power by more than a predetermined amount nor interfere with normal transmissions of said radio station that are broadcasted simultaneously, (C) a plurality of remotely located addressable tone coded radio receivers controlling a plurality of external apparatus and tuned to detect and phase-lock to residual carrier frequency of said broadcast station to thereby demodulate and decode said tone coded address & control signals and selectively respond thereto to control said apparatus.