Pragmatic Communications Systems, Inc.

Signetics

The Product Group, LLC

Prasanna Manhar Shah

Herbert John Kniess

Robert L Taber

Dan Ion Hariton

Adnan Aslam

James Anthony Italiano

An intelligent controller (), adapted for regulating operation of either a refrigeration system or an air conditioning system (), receives an output electrical signal produced by a pressure sensor () included in the system (). Responsive to the received electrical signal, the intelligent controller () energizes operation of a motor () that drives a compressor () included in the system (). The programmable electronic circuit () performs a calibration operation in which the circuit () measures the output electrical signal received from the pressure sensor () and stores as an offset the value so measured. The programmable electronic circuit () subsequently applies the stored offset for adjusting a value of the output electrical signal received from the pressure sensor () during normal operation of the system ().

Intelligent controller for refrigerating and air conditioning systems

A method and system for switching signals over conductors is disclosed. The method and system comprises a plurality of encoders for receiving signals from a plurality of sources. The system further comprises a crosspoint switching matrix means for receiving encoded signals from the plurality of encoders and for providing encoded signals to a plurality of receivers. The crosspoint switching matrix means in a preferred embodiment includes a control system which is controlled by multiple remote receivers.

System and method for switching signals over twisted-pair wires

A wireless interface system comprising a set of input ports for keyboard, pointing device, and joystick signals, a data encoding circuit, a transmission unit, a receiving unit, a data decoding circuit, a keyboard data multiplexer unit, a pointing device data multiplexer unit, a joystick signal multiplexer unit, and a set of output interfaces for connecting to the corresponding computer ports. This system allows for the user to have a keyboard, pointing device, and joystick remotely located from the computer, and each input device shares a single wireless communication link to send its data to the computer.

Wireless interface system for allowing a plurality of input devices to control a processor

A transceiver system for high speed, low bit-error rate data communications over a.c. power lines in the presence of repetitive impulse noise includes an a.c. power line coupling network, a power line communications modem, and a microprocessor with a memory and a programmed avoidance algorithm. The a.c. line coupling network includes a zero crossing circuit to detect the start of each a.c. cycle; a transient-voltage limiting front end to detect impluse noises above a threshold and minimize ringing, and a timing circuit to determine the time and duration of each impulse in each sampled a.c. cycle. The microprocessor records the start and stop times of impulses, repetitively scans several a.c. cycles and determines whether or not the impulses are periodic. For periodic impulses, the microprocessor blocks communication on the modem during the impulses, enabling the transceiver to transmit and receive between impulses.

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Sunnyvale, CA, United States of America

Prasanna Manhar Shah