PHGY 212 Lecture Notes - Lecture 1: Digital Filter, Oversampling, Digital Signal Processing
Document Summary
Biological signal acquisition: goals: computer-based data acquisition & digital signal processing, 3 experiments: (1) waveform acquisition (2) artifacts contaminating eeg recordings and (3) alpha waves in eeg. Signal: abstract element of information: coded messaged sent from one organism to another or between parts of organism. Function: contain information about behavior of some phenomenon, for 1 or more independent variables: transmitter -- receiver. Electrophysiology: measures flow of ions in biological tissues & related changes in potential: measure extracellular potential for this lab, ekg measures heart, spirogram breathing and eeg brain. Sine wave: waveform: signal amplitude plotted as function of time, biological signals are complex waveforms, deterministic: predictable for time span of interest. Stochastic/random: signal whose value has some element of chance associated with it: hard to model mathematically. Frequency: number oscillations per second (hz: 1 oscillation/cycle in 1 sec) Spectral analysis: allows us to see what frequencies/amplitude make up the signal.