Abstract: An example may include receiving a page code identifier, determining a priority of the page code identifier, queuing the page code identifier in a paging queue, retrieving content associated with the page code, and forwarding the content to one or more audio devices identified by the page code identifier when the page code has reached a top of the queue.

Abstract: A system for indicating the level of material in a vessel as a function of material capacitance comprising a resonant circuit including a capacitance probe adapted to be disposed in a vessel so as to be responsive to variations in capacitance as a function of material level. An oscillator has an output coupled to the resonant circuit and to a phase detector for detecting variations in phase angle as a funciton of probe capacitance. Level detection circuitry is responsive to an output of the phase detector and to a reference signal indicative of a level of material for indicating material level as a function of a difference between capacitance at the probe and the reference signal. In the preferred embodiments of the invention disclosed, an automatic calibration circuit adjusts the resonance characteristics of the parallel resonant circuit in a predetermined or preprogrammed manner during a calibration operation to a point indicative of the predetermined reference material level.

Abstract: A voice operated switch having minimum signal amplification in the stages which separate the voice signals from the noise signals. The majority of amplification is then applied only to the syllabic rate voice component detected by an offset threshold in the syllabic rectifier-amplifier circuit to produce a two-state signal, one state representative of the presence of voice energy and the other state representative of the absence of voice energy. The two states are compared with a threshold voltage adjustable between a maximum and minimum voltage. A maximum and minimum setting allow a respective nontransmission and transmission of the voice signals irrespective of the presence or absence of such signals.