Understanding Transfer Function Coherence

Transfer function coherence is the single most important quality indicator in dual-channel acoustic measurement. Expressed as a value between 0 and 1, coherence tells you how much of the measured signal is linearly related to the reference signal at each frequency. Low coherence means the measurement is contaminated by noise, reflections, or nonlinear behavior. These FAQs explain what coherence values mean in practice, how to interpret common coherence patterns, and what steps you can take to improve measurement reliability in real-world environments.