Abstract: A battery-powered infrared sensor security system capable of operating on a single set of batteries for a minimum of one year. The system is connected to a telephone line and employs a bidirectional dual-tone multiple frequency (DTMF) tone generator/receiver to allow communication to and from a remote location. The system status may be checked from the remote location and certain system parameters may be varied from the remote location. The system uses a Fresnel lens arrangement and a pair of infrared sensors to provide a substantially uniform field of coverage of 180.degree.. The system also uses real time digital analysis of the output signals from the infrared sensors. The digital analysis uses time sequence analysis of the output signals, performs variance measurements between the current measurement of the infrared sensor signals and the stored time sequence, coherence measurements between the two sensors, and can compare measured amplitude spectra to predefined signature spectra entered by the user.

Abstract: An integral handset supporting hook and number card cover for supporting a handset for a wall or desk mounted telephone subset comprises a hook portion which can be mounted in either a wall or desk mounting position and a number card cover portion for protectively covering the local telephone number card. The hook/cover is comprised of a clear plastic or polymeric material thereby allowing a user to see the number through the hook/cover. The hook/cover is easily adaptable for use with a wall mounted unit utilizing a protruding hook for supporting a handset or with a desk mounted unit employing the same hook in an inverted position where the hook is recessed and does not interfere with the lifting of the handset.