arXiv:2610.40697v1 Announce Type: new Abstract: Objectives: High-Speed Videoendoscopy glottal area waveforms conflate lateral fold excursion with longitudinal opening, precluding direct estimation of velocity, acceleration, and left-right asymmetry. Displacement waveforms preserve these quantities but are susceptible to spatial quantization and temporal sampling errors. We characterize these errors, evaluate reduction via Kalman smoothing and temporal interpolation, and determine optimal frame rate bounds relative to pixel excursion, speed quotient (SQ), and open quotient (OQ). Methods: Sampling theory was used to derive analytical frame-rate bounds required for kinematic feature fidelity. Kalman smoothing was compared with FFT-based denoising, paired with sinc or spline interpolation. Interpolation was evaluated on 4000 fps recordings (N=55) downsampled and reconstructed. A 16000 fps dataset (N=12) served as reference for noise reduction across 2000-8000 fps downsampled waveforms evaluated on peak displacement, velocity, OQ, and SQ. Results: Sinc interpolation yielded lower median mean absolute error than spline (0.29 vs 0.52 pixels), with 85% of recordings (47/55) versus 45% (25/55) below 0.5 pixels. For kinematic feature estimation (N=12), Kalman-sinc outperformed FFT-sinc in 75% of feature-by-frame-rate pairings. Conclusion: Computing kinematic features without artifacts requires joint consideration of temporal and spatial resolution. Kalman-sinc preprocessing at 8000 fps is recommended for velocity and SQ measures. Peak lateral displacement can be measured at 2000 fps, while OQ requires 4000 fps for typical spatial resolutions (9-14 pixels maximum excursion). Pixel excursion should be reported alongside kinematic measures to contextualize data reliability.