Disclosed are digital imaging devices that embody a method or algorithm for transitioning from a displayable focus process to a high speed focus process which can be displayed, and wherein the transition is accomplished in a seamless fashion. These techniques can be implemented, for example, in a wireless local area network. Initially, the oven is operated at full output capacity for a first predetermined period and thereafter operated at various heat outputs during a subsequent plurality of stages until the cooking operation is complete. A signal combiner arrangement combines a carrier with signals containing information passed by the lowpass filter arrangement necessary to derive a vestigial sideband signal. The device information is then analyzed to identify details of the devices. Thus, for example, the computer and firewall can be coupled to the common path\u2014e.