| 摘要 |
<p>A pressure measurement device (10) with a selective altitude threshold crossings accumulator and method therefor provides for selective accumulation of relative pressure thresholds. A pressure sensor (12) measures atmospheric pressure and provides analog pressure signals (30) representing measured atmospheric pressures. A digital-to-analog converter (14) converts the analog pressure signals (30) to digital pressure signals (32) for a computer (16) which then computes altitudes corresponding to the measured atmospheric pressures. The computer (16) assigns a threshold flag value which corresponds to the relative direction (e.g. 'up' or 'down') from a first (e.g. lower) altitude to a second (e.g. higher) altitude when the magnitude of the first-to-second altitude differential exceeds a first threshold. The computer (16) then generates a unit count (34) when both the relative direction from the second altitude to a third (e.g. lower) altitude opposes the first-to-second altitude direction and the magnitude of the second-to-third altitude differential exceeds a second threshold. An accumulator (18) accumulates the unit counts (34), and the accumulated count (36) is displayed on a display device (20, 22).</p> |
