G - Physics – 06 – F
Patent
G - Physics
06
F
354/235
G06F 3/14 (2006.01) A61B 5/0432 (2006.01) A61B 5/0436 (2006.01) G01R 13/34 (2006.01) G06F 5/10 (2006.01)
Patent
CA 1087748
ABSTRACT OF THE INVENTION A system for the cyclical time-compression of a signal waveform, particularly applicable to the display of physiological waveform data from patients. The system receives a continuous data sequence, as from an initial waveform, and continuously and temporarily stores waveform data during the trace and retrace phases (phases B & A) of a processing or display operation or cycle and which subsequently reads out substantially all of the stored data in a time-compressed form during the trace phase (phase B) of the cycle. The rate at which data is read out of storage is uniform and faster than the rate at which it is entered into storage. Further, the compression ratio of the system is fully flexible, though from the standpoint of design convenience at least one of the integers of the ratio may be binary based. In a preferred embodiment, the data storage is provided by a random access memory capable of storing the requisite number of data samples occurring during the retrace or blanked phase of a display cycle. Separate read and write address counters are indexed at respective different rates such that the ratio of their rates corresponds with the desired compression ratio. The read address counter is inhibited during the retrace or blanked phase of the display cycle while the random access memory is "filled" with incoming data samples. The inhibit signal may also synchronize or otherwise control generation of the sweep signal for a display device.
274422
American Optical Corporation
Macrae & Co.
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