sampling rate

[Louisa Sh Law [rs]]

Dear all,

I posted up a request for help a few days ago asking if 60hz sampling rate is too low to film the upper limb movement correctly. The movement involves throwing a ball into a target for accuracy in normal children and children with cerebral palsy. I am interested in studying the inverse dynamics control of their limbs

Thanks to Dr. Christian Peham from University of Veterinary Medicine Vienna who indicated to me that Shannon's Theorem could be a guideline for me. This Theorem states that: " .. if the sampling is carried out at more than two times the highest frequency in the signal before sampling, then the signal can be reconstructed without degradation.".

Since this is the first time I study the upper limb movement, I wonder if anyone could enlighten me with the highest frequency generally observed in the signal of upper limb motion related to task in my study.

Thanks in advance
Louisa




Dr. Louisa SH Law, P.T. EDD
Assistant Professor
Department of Rehabilitation Sciences
The Hong Kong Polytechnic University
Hong Kong, SAR
Tel: (852) 27664332
Fax: (852) 27641435
E-mail: rsllaw@inet.polyu.edu.hk

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