National Semiconductor Corporation

Other

Dennis E Morris

Gregory W Ledenbach

Frank Goffreda

A co-extrusion die can simultaneously extrude different extrudate into a multilayer tube. The die has a plurality of mandrels and a casing having an inlet side and an outlet side. The mandrels are coaxially nested in the casing. This casing is shaped on the interior of its outlet side to mate with the mandrels and provide an annular outlet. The casing and the mandrels are positioned and shaped to provide a plurality of interspaces. At least one of the interspaces is shaped to define an annular passage. Another interspace is shaped to define a spiral passage. These annular and spiral passages communicate with the annular outlet.

Co-extrusion die

A circuit that monitors the LED driver output pins on an integrated circuit for quiescent moments and then uses those output pins, only during these moments, to strobe keys on a keyboard for input signals.

Integrated circuit output pins used for input signals

A system for recognizing a received encoded signal as being from a particular transmitter is disclosed. An encoder encodes a signal to have a predetermined sequence of pulses of three different predetermined sequence of pulses of three different predetermined durations within a constant bit interval in accordance with a trinary code; wherein each of the different predetermined durations corresponds to a different bit. A decoder is coupled to the receiver for recognizing the received encoded signal as being from the particular transmitter includes a programmable digital logic signal generator that is programmed in accordance with the trinary code for generating a programmed digital logic signal having a predetermined sequence of different digital words corresponding to the predetermined sequence of pulses of different predetermined durations in the transmitted encoded signal; a code converter for converting the received encoded signal to a decoded digital logic signal having digital words in accordance with the selected code by measuring and comparing the relative durations of the pulse and the non-pulse time during each bit interval; a comparator for comparing the decoded digital logic signal with the programmed digital logic signal; and a control logic circuit coupled to the programmable signal generator, the code converter and the comparator for synchronizing the programmed digital logic signal with the decoded digital logic signal and for recognizing the received encoded signal as being from the transmitter when said comparison indicates a predetermined number and sequence of valid comparisons between the decoded digital logic signal and the programmed digital logic signal.

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Saratoga, CA, United States of America

Dennis E Morris