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Method and apparatus for data compression of heart signals

An improved turning point system and method for performing data compression is disclosed. The system improves the conventional turning point compression method by selecting a predetermined number of the "best" turning points in the sample window including data samples X0 and XN. From this sample-window, ones of the data samples X1 through X(N-1) will be identified as turning points using a selected one of a disclosed set of turning point detection methods. In one embodiment, a turning point is identified by determining that the slopes in the lines interconnecting adjacent data points have different polarities. In an alternative embodiment, a data sample XM is considered a turning point if the slope of the line between the data samples XM and X(M+1) has a different polarity as compared to the slope of the last waveform segment that was encountered that did not have a slope of zero. According to one mechanism, amplitude thresholding is used to detect whether an identified turning point is likely the result of noise such that the turning point status of the data sample should be disregarded. After data samples are identified as turning points, ones of the identified turning points are identified as the "best" turning points to be selected for retention. The best turning points may be identified by determining which waveform segment included within a sample window has the largest change of amplitude. An alternative embodiment detects which of the turning points has the greatest signal amplitude compared to a reference value. Yet another embodiment selects as the best turning point that point having an amplitude that differs the most from the amplitude of the first data sample in the sample window. Still other embodiments retain the turning point having an amplitude which is more positive, or alternatively, more negative, than the other data samples. According to one aspect of the invention, the compression ratio varies based on the frequency of the input waveform. In another embodiment, position data is retained to indicate the relative position of retained data samples as compared to the position of other retained data samples. This position data may be calculated at a frequency that is less than the frequency of the sampled data.
Owner:MEDTRONIC INC

Colour Display System

A colour display system for aiding the selection and combination of colours in colour scheming is described, wherein the system comprises an array (10) of colour sample elements (12) each of a respective colour, the elements being grouped in discrete blocks (14) according to hue, chromaticity and lightness; the colour sample elements of each block all have colours which are within a hue range respective to that block and which have predetermined chromaticity and lightness properties associated with that block (14); the blocks are arranged in at least 3 parallel lines (16) according to their associated chromaticity and lightness properties such that all of the blocks in each line have similar or the same respective associated chromaticity and lightness properties; each line contains M blocks (where 6≦M≦12) which are arranged in a hue range sequence along the line; within each block the colour sample elements are arranged in a series of hue increments in the direction of the said lines and corresponding to the sequence of the hues of the elements in the visible spectrum, and in a series of lightness increments such that lightness increases in the orthogonal direction; and the angular range of hues in each block, as defined by the CIELAB colour space, vary in size between blocks such that the blocks containing the 90 degrees CIELAB hue have a hue angle range of one half or less than one half the size of the hue angle range of the blocks containing the 270 degrees CIELAB hue.
Owner:PPG ARCHITECTURAL FINISHES INC
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