Harmonic distortion
– Harmonic distortion adds harmonics to a signal
– A series of harmonics is superimposed on the original signal
– Harmonics can be detected with suitable equipment
– Total Harmonics Distortion (THD) is the ratio of harmonics to the fundamental
– THD can be expressed in dB or percentage
Distortionmeter instrument
– A distortionmeter is a levelmeter with two switchable parallel circuits
– The first circuit measures the total signal at the output of a system
– The second circuit is a high pass filter that removes the fundamental frequency
– The output of the filter is measured as a percentage of the fundamental
– The reported value is the distortion value
Related term
– Audio analyzer
Reference
– Reference data for Radio Engineers, Howard W.Sams & co.ITT, ISBN0-672-21218-8, p.18-12 Source: https://en.wikipedia.org/wiki/Distortionmeter
A distortionmeter (or more precisely distortion factor meter) is an electronic measuring instrument which displays the amount of distortion added to the original signal by an electronic circuit.
