Abstract: A preferred duplex communications device includes a speaker for transmitting a signal received from a remote source, first and second microphones for transducing received acoustical signals wherein the first microphone is positioned significantly closer to the speaker than the second microphone so that the first microphone receives significantly more acoustical signal strength from the speaker than the second microphone. A first amplifier is connected to the first microphone and a second amplifier is connected to the second microphone wherein the second amplifier has a gain relative to a gain of the first amplifier such that the output signals of the first and second amplifiers are generally equal with respect to signals received by way of the speaker. A filter is then connected to the outputs of the first and second amplifiers to filter the signals transduced from the speaker thereby preventing transmission to the remote source of essentially all of the signals from the speaker.

Abstract: A personal electronic communication apparatus for carrying by an individual including, a housing having an indicator panel for displaying received information characters or the status of the apparatus located on the front face of the housing. The housing has a normal right-side-up orientation in which all of the information characters being displayed may be read in a normal fashion. A support device includes normally parallel front and back plates, with a hinge mechanism pivotally joining the upper portions of the plates and is adapted to be vertically inserted around a belt or to clip on to a pocket flap, with the hinge mechanism projecting upward. The front plate has means for fastening it to the back face of the housing in such an orientation that the indicator panel is normally up-side-down with respect to the individual carrying the apparatus, that is, the indicator panel faces away from the person carrying the apparatus.