Tech Topic: Coherence & Reverberation
Real-world observations on separating the signal from the noise.
By Merlijn van Veen • January 11, 2019Coherence is a common feature found on many analyzers that enables us to distinguish signal from noise. It will indicate whether you’re measuring a loudspeaker or, for example, a moving light.
Coherence is subject to change. One of the aspects involved, among others, that we’ll explore in-depth is the relationship between the direct sound of a loudspeaker in a room and the room’s reverberation. This is an attempt at putting real-world observations into context. Many of the results have been obtained experimentally, and some concepts that don’t directly further our understanding have been deliberately omitted.
Loosely defined, coherence is a function that indicates contamination of the measurement data. It’s proportional to the ratio of signal to the sum of signal plus noise...
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