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Total Harmonic Distortion - Universal Audio
https://www.uaudio.com/blog/total-harmonic-distortion/
A THD measurement can be made by applying a sine wave as an input to a system, and measuring the total energy which appears at the output of the system at harmonics of the input frequency. A sinusoidal input is used because sinusoids contain energy at only a single frequency; output energy that appears at any other frequency is thus the result of nonlinearities or time …
THD Meter - Technical Documentation
https://www.steinstokholm.com/thd-meter-tech-docs.html
In audio electronics, the Total Harmonic Distortion (THD) is one of the most fundamental measurements. This project aims at designing a circuit that can be used as a rough THD measurement at the frequencies 1kHz and 20kHz. These frequencies are often used when measuring and comparing performance. Specifications
Basic Total Harmonic Distortion (THD) Measurement
https://www.microsemi.com/document-portal/doc_view/134813-an30-basic-total-harmonic-distortion-thd-measurement
(THD). Harmonic distortion is measured by applying a spectrally pure sine wave to the amplifier in a defined circuit configuration (i.e., bias conditions, output amplitude or output power level, frequency, etc.) and observing the output spectrum. The …
YMEC software - THD (Total Harmonic Distortion) analyzer ...
http://ymec.com/hp/signal2/thd.htm
Total Harmonic Distortion (THD) analyzer Total harmonic distortion (THD) is one of the most common and important specification in the audio measurement, which is used to describe the ability of the device to accurately reproduce an input signal at its output. Audio signals suffer some distortion when they pass through electronic circuits.
Audio Distortion Measurements - Brüel & Kjær
https://www.bksv.com/media/doc/BO0385.pdf
For example, total harmonic distortion (THD) is usually described as a percentage of the power sum of all the harmonics to the power sum of all the harmonics plus the fun damental (i.e. amplitude normaliza tion). %THD=- 100Vg22+H^- iHf+Hi+Hl Hi HN=Harmonic response of Nthharmonic. H1=Fundamental response.
THD measurements - diyAudio
https://www.diyaudio.com/community/threads/thd-measurements.347549/
THD measures 0,39% with 36 Watt output. Now my signal generator has 0,10% THD for 0,32 Volt PP input. My USB audio input also has approximately 0,10% THD. What THD figure is “real” for the amplifier part only? Should I calculate 0,39 - 0,10 - 0,10 = 0,19%? Regards, Gerrit Click to expand...
A DIY approach to distortion measurements for audio ...
https://enjon.uk/2019/09/01/a-diy-approach-to-distortion-measurements-for-audio-amplifiers/
You can perform a ‘loopback’ test to measure the harmonic distortion of your own audio interface by connecting an RCA cable between the output and input and using REW to generate a 1kHz tone (use the generator icon on the main window). It is worth calibrating your device in the soundcard preferences panel before commencing testing.
Howto - Distortion Measurements with REW | diyAudio
https://www.diyaudio.com/community/threads/howto-distortion-measurements-with-rew.338511/
You need to click on the span button to set your range of measurement from say 20Hz to 20kHz. On the vertical scale button on upper left click on dBFS. Then click on the red button to acquire your FFT spectrum. You will see a relatively flat spectrum (hopefully) but this will tell you what the noise floor of your setup is.
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