Comparing Two Smoothing Approaches in Estimating Kinematic Parameters
Stephan R. Kuberski, Adamantios I. Gafos- Speech and Hearing
- Linguistics and Language
- Language and Linguistics
Purpose:
We compare two signal smoothing and differentiation approaches: a frequently used approach in the speech community of digital filtering with approximation of derivatives by finite differences and a spline smoothing approach widely used in other fields of human movement science.
Method:
In particular, we compare the values of a classic set of kinematic parameters estimated by the two smoothing approaches and assess, via regressions, how well these reconstructed values conform to known laws about relations between the parameters.
Results:
Substantially smaller regression errors were observed for the spline smoothing than for the filtering approach.
Conclusion:
This result is in broad agreement with reports from other fields of movement science and underpins the superiority of splines also in the domain of speech.