122 – Power Spectrum Analysis

AcqKnowledge can be used to obtain the power spectrum of any time domain waveform. The power spectrum indicates the power of each frequency component of the source time domain waveform. The power spectrum can be used to analyze a variety of physiological signals. The ECG (rate) and EEG signals are often categorized using spectral analysis.

This application note shows how to relate power in the time domain to power in the frequency domain using very simple signals in hopes of clarifying the explanation. The FFT in AcqKnowledge allows frequency representation using linear or logarithmic scaling. All discussions and analyses for this paper are done using linear scaling.

Associated Files

Associated Applications

  • EEG: Electroencephalography - Wired and wireless EEG solutions. Record up to 32 channels of EEG and use software features for filtering, removing EOG artifacts, and complete frequency analysis.
  • ERS: Evoked Response - Record evoked, late, and field potentials, as well as startle and nerve conduction. Powerful on- and off-line averaging features (P300), and dual stimulation ability with the MP150.
  • Psychophysiology - Record and analyze BP, ECG, HRV, EDA, EMG, EEG, EOG, RSP, etc. Interface to stimulus presentation programs...use automated analysis routines to easily score and analyze data.
  • Sleep Studies - Long term recordings with up to 16 channels of data. Record EEG, EOG, EMG, respiration, temp., sound, limb position and more. Filter out EEG frequencies to score sleep stages.
  • ECG: Cardiology - Connect up to 16 ECG input leads with MP160 system. Use automated analysis features for HRV, RSA, to classify heartbeats, identify arrhythmias, and perform ECG averaging.
  • Cardiovascular Hemodynamics - Hardware for human and animals. Measure continuous BP, ECG, stroke volume, cardiac output, PPG, etc. For animal and tissue look at acute and chronic dose-response.
  • EGG: Electrogastrogram - Measure electrical activity of gastrointestinal system in humans and animals. Examine slow wave propagation and perform automated gastric wave analysis in AcqKnowledge.
  • In vitro Pharmacology - Record from tissue bath, isolated organ, Ussing chamber, or use field stimulation. Advanced algorithms analyze Langendorff, working heart, and isolated perfused lung data.
  • MER: Micro-electrode Recording - Use micro-electrodes and MCE100C amplifier to record in-vivo or in-vitro from organisms, organs, tissues, brain slices, and cells. Record from up to 16 amplifiers simultaneously.
  • Exercise Physiology - Examine ventilation, oxygen uptake, carbon dioxide production, biopotentials, temp., and biomechanical signals simultaneously. Record wirelessly with BioNomadix.
  • EMG: Electromyography - Record surface, needle, and fine wire EMG—or wireless EMG with BioNomadix. Use real-time integration tools for immediate analysis or use automated EMG analysis routines.
  • Biomechanics - Use BIOPAC equipment for gait analysis, goniometry, ergonomics evaluation, range of motion, EMG, Remote Monitoring or to interface with third-party equipment.
  • Remote Monitoring - BioNomadix modules provide high quality, full-bandwidth data for a variety of signals—ECG, EEG, EGG, EMG, EOG, PPG, RSP, SKT, Accelerometry, Cardiac Output, Dynamometry, and Heel-Toe Strike.
  • Amplifiers & Interfaces - Use BIOPAC amplifiers with MP Systems, as stand-alone devices, or with 3rd-party flow meters, force plates, sono-micrometers, telemetry equipment, metabolic carts, etc.

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