BIOPAC® Systems, Inc. Logo

High pass filters

High pass filters attenuate the components of a signal below a certain frequency range. They help to remove lower frequency variation — possibly due to signals that are uninteresting in context — from data. For example, you can remove the respiratory component from ECG by running the data through a 1 Hz High Pass filter either in hardware (a setting on the amplifier) or in software (“Transform > Digital Filters > IIR > High Pass…”). The filter will center the signal around the zero line.  The cutoff frequency of the filter provides an indication of what fruequencies are attenuated.  Note that some energy at frequencies lower than the cutoff frequency will remain in the filtered signal.

Page last modified 29Dec2014

Associated Applications

Associated Disciplines

Spotlight On
Ventilator Validation Kit

Ventilator Validation and Test Equipment

The Ventilator Validation Kit supports new prototype development, existing design validation for production testing, mobile field testing and verification, and other uses where accurate pressure and flow measurements are critical. The Ventilator Validation Kit provides ventilator manufacturers and prototype developers with a complete solution for validating new medical/hospital-grade ventilator products intended for human use. The VVK100-SYS includes […]

View All
Latest News

New Citations | Logic Games and Meditation: the Key to Unlocking our Brains?

Studying Cognitive Activity with fNIR! The age-old game of chess is known as a thinking man’s game, where foresight, critical thinking, and strategy are required to become a good chess player, and the terms “genius” or “brilliance” are bestowed upon the chess masters of the world. As such, chess is an excellent cognitive tool to […]

Electrocardiography Guide Now Available

BIOPAC’s comprehensive Introductory ECG Guide addresses fundamental to advanced concerns to optimize electrocardiography data recording and analysis. Topics include: ECG Complex; Electrical and Mechanical Sequence of a Heartbeat; Systole and Diastole; Configurations for Lead I, Lead II, Lead III, 6-lead ECG, 12-lead ECG, precordial leads; Ventricular Late Potentials (VLPs); ECG Measurement Tools; Automated Analysis Routines for extracting, […]

Read All
Request a Demonstration
Request a Demonstration