Oscillometric Blood Pressure: Envelope Method

This is the 2D companion to the 3D Sphygmomanometer / Korotkoff-sounds simulator. Instead of modelling the turbulent-flow sound a clinician auscultates, it forward-models the mechanism a modern automated blood-pressure cuff actually uses: the artery's nonlinear wall compliance, driven by a real cardiac pressure waveform, is integrated frame by frame to produce the tiny pressure oscillations the cuff bladder transmits to its internal transducer. Sweeping the cuff pressure down slowly traces out the classic bell-shaped oscillometric envelope live, and the same fixed-ratio algorithm real devices use — systolic at 55% of peak amplitude on the way up, diastolic at 65% on the way down — reads systolic and diastolic pressure directly off that curve. A live error readout compares the device's estimate against the true values you set, showing the several-mmHg tolerance that is a genuine, documented characteristic of the oscillometric method rather than a simulation shortcut.