Total Harmonic Distortion Analysis
Real world audio devices introduce distortion in addition to the desired response. Total Harmonic Distortion (THD) is a measure of this quantity.
THD is the ratio of the harmonic power to the fundamental power. It is expressed as a percentage. The lower the THD value, the "cleaner" the response. A typical THD measurement will use a 1kHz reference test tone. This reference signal is passed through the audio device under test,and its THD computed from the spectrum
Views: Spectrum, Time Series
Amplitude axis: Logarithmic
Frequency axis: Linear
Standard Weighting: Flat
Mic compensation: None
Sampling rate: 44100Hz
FFT size: 8192
Averaging size: 10
Smoothing Window: Hanning
Sampling Format: 16 bit, Mono
Connect a 1kHz test tone to the imput of the device under test.
Connect the output of the device under test to the input of your sound card.
Run the analyzer for sufficient time to allow the spectrum response to settle.
Select <Total Harmonic Distortion> under the <Utilities> menu item.