Patent ID: 8644418

Claim:
A transmitter module for unidirectional communication with a receiver module, the transmitter module comprising: a carrier detection portion configured to (i) identify communication of a plurality of communication signals within a communication medium, (ii) determine signal strengths of the plurality of communication signals and defining each determined signal strength as one of substantial and negligible, (iii) identify frequency components of the communication signals having corresponding signal strengths defined as negligible as respective predetermined frequency components, at least one preliminary identified signal being produced based on the predetermined frequency components, and detection signals being communicable from the carrier detection portion based on the at least one preliminary identified signal; a source processing portion coupled to the carrier detection portion, the source processing portion configured to modulate an appropriate carrier signal with an information signal to produce a processed information signal, the appropriate carrier signal being based on the detection signals communicated from the carrier detection portion and the processed information signal is associable with at least one of a unique code and an indication signal, the indication signal being associable with absence of communication of the at least one communication signal in the communication medium; and a source transmission portion coupled to the source processing portion, the source transmission portion is configured to receive and process the processed information signal to produce a source signal, the source signal being associable with at least one of the unique code and the indication signal, wherein the source signal is communicable from the source transmission portion to the receiver module via the communication medium.