Abstract: A system and associated methods that use separate paths to send amplified data. The method expands, or amplifies, the amount of data that can be transmitted over a dedicated bandwidth-limited communications medium by using a first channel for transmitting clock synchronization pulses and transmitting the data as pulse position modulated (PPM) data over a second separate bandwidth-limited communication channel. Data for transmission is encoded by determining if the period of a pulse encroaches into the frame of the subsequent pulse. In response to a determination of encroachment, one or both of the pulses are inverted and time shifted to eliminate the encroachment. In the event that inversion of one or both of the pulses does not eliminate the encroachment, a blank is inserted between the two pulses.

Abstract: Security (e.g., theft-disincentive) for portable electronic appliances is provided by integrating a decoder into the power supply of an electronic appliance which prevents the electronic appliance from being powered up in the absence of a unique code impressed by an emitter on the power lines feeding power to the electronic appliance, and permits the electronic appliance having a decoder to be powered up (i.e., power-uppable) only in the presence of the unique code. Electronic appliances having the detector incorporated (e.g., integrated) therein are termed "protected equipment". The emitter may be "fixed" by hard-wiring same to the power lines in a household (e.g., behind a switch or receptacle face plate), or may be "portable") so that the user can transport and use (e.g., power up) the protected equipment at an other location simply by plugging the emitter into a receptacle at the other location and located in a safe place.