Encryption system for time division multiplexed networks, US5161191, 11/03/1992

An encryption system is provided for interfacing a time division multiplexing (TDM) telecommunications arrangement with an encryption device for the scrambling of data received by the telecommunications arrangement. The telecommunications arrangement produces a TDM data stream formatted into TDM frames including a predetermined number of TDM framing bits and corresponding framing bit locations. At a local side of the system, a first TDM data stream is received and sampled, and the TDM framing bit information is detected and stored therefrom. The data stream is then sent to an encryptor for encryption, and thereafter the TDM framing bit information is reinserted into the corresponding bit locations of the encrypted data stream. As a result, the TDM framing bit information is passed around the encryptor. This encrypted data stream and framing bit information is transmitted to a remote station across a TDM (e.g., T1) communications network. At the remote station, the TDM framing bit information is again detected and stored, the encrypted data stream is decrypted, and the TDM framing bit information is reinserted to the corresponding locations.

Shared aperture antenna for independently steered, multiple simultaneous beams, US5128687, 07/07/1992

An antenna including a lens that has an array of radiating elements located on a focal arc, each radiating element corresponding to a different transmission beam direction; and a beam launcher having a plurality of phased arrays and a plurality of internal probes, each of the plurality of internal probes being electrically coupled to a corresponding one of the radiating elements, the phased arrays for space feeding a selected one or more of the radiating elements with signals so as to generate corresponding transmission beams from the lens.

System and method for detection of microbursts by measuring various weather condition parameters at both spaced time and location intervals, US5117359, 05/26/1992

The invention comprises a microburst detection and measurement system having a plurality of SENSTRANS units positioned at spaced intervals, each SENSTRANS unit monitoring humidity, wind speed, wind direction, barometric pressure, and temperature. The sensors transmit the observed weather conditions to a central data processing and display unit via RF, FM transmission. The data processing and display unit collects and assimilates the data to determine if the measured parameters indicate the likely presence of microburst or other weather hazards. If so, it issues a weather hazard warning both visually and audibly.

Acoustic modulation apparatus for laser, US5097480, 03/17/1992

The invention comprises a laser light source for a raster laser display. The laser light source comprises a laser cavity, a lasing medium within the cavity, a lasing light source and a series of mirrors within the cavity arranged to reflect the beam of laser light repeatedly through the lasing medium. An acoustic modulator is included having an acoustic medium within the path of the beam within the cavity. Video information on each pixel of the display is converted to an RF signal and fed to a piezoelectric crystal which is coupled to the acoustic medium. The acoustic medium is arranged within the laser cavity with respect to the incident laser beam such that, in response to the acoustic information, the laser beam is either directed towards the screen, or when not needed for the display is directed towards one of the mirrors such that the beam can continue to propagate through the lasing medium.