Tweet to @MicrolinkUK

Microlink Measurement and Control Systems

Technical Notes: Filtering


Filtering reduces noise errors in the signal. For most applications a low-pass filter is used. This allows through the lower frequency components but attenuates the higher frequencies. The cut-off frequency must be compatible with the frequencies present in the actual signal (as opposed to possible contamination by noise) and the sampling rate used for the A-D conversion.

A low-pass filter that's used to prevent higher frequencies, in either the signal or noise, from introducing distortion into the digitised signal is known as an anti-aliasing filter. These generally have a sharper cut-off than the normal low-pass filter used to condition a signal. Anti-aliasing filters are specified according to the sampling rate of the system and there must be one filter per input signal.

You can enable and disable filters in Microlink hardware from software.


Home
Index
Previous: Measurement Techniques
Search


Measurement News Feed (RSS) Tweet
subscribe to free data acquisition newsletter
Copyright Biodata Ltd 2006
10 Stocks Street, Manchester M8 8QG, UK
Tel: +44 161-834 6688
Fax: +44 161-833 2190
E-mail: info@microlink.co.uk