Tektronix, Inc.

Stanley C Edwards

Ajay K Luthra

Edgar T Guenther, Jr

Regis J Crinon

Peter M May

An improved pulse generator circuit includes a pulse shaper circuit for generating interrogating bipolar pulse having reduced or no energy at zero frequency for use in a measurement test instrument for characterizing a transmission medium, such a twisted pair and coaxial transmission cables.

Time domain reflectometer having optimal interrogating pulses

An adaptive spatio-temporal compression/decompression algorithm for a video image uses a quadtree hierarchy to represent each frame of the image, the quadtree hierarchy including intermediary nodes and leaves. For each leaf a temporal bit is added indicative of whether a significant intensity change occurred between two frames of the video image. If the temporal bit indicates the significant intensity change occurred between frames, then a new intensity value also is added to that leaf. A decoder using a state machine extracts from the resulting compressed data stream a start address, a block size and the new intensity value for each leaf having the significant intensity change between frames to update a display memory with the new intensity value at each pixel within the area defined by the start address and block size.

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Bend, OR, United States of America

Stanley C Edwards