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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.
DISTORTION MEASUREMENT IN AUDIO AMPLIFIERS
https://renardson-audio.com/distortiontest.pdf
DISTORTION MEASUREMENT TECHNIQUES. 1.1 Requirements for the measurement of distortion in audio frequency power amplifiers. In an ideal audio frequency power amplifier the output signal voltage would be identical to the input signal voltage multiplied by a constant. The input impedance would be infinite so that there would be no loading effect ...
Audio Distortion Measurements - Brüel & Kjær
https://www.bksv.com/media/doc/BO0385.pdf
haviour. But these linear measure- by distortion measurements is prob- for an anechoic chamber, and stand-ments cannot completely describe all ably going to be more revealing as to ards for measuring distortion. Differ-of the inaccuracies we hear. For exam- the limitations which most influence ent test methods are discussed for
SECTION 8 DISTORTION MEASUREMENTS
https://www.analog.com/media/en/training-seminars/design-handbooks/Practical-Analog-Design-Techniques/Section8.pdf
Audio frequency amplifiers (such as the OP-275) are optimized for low noise and low distortion within the audio bandwidth (20Hz to 20kHz). In audio applications, total harmonic distortion plus noise (THD+N) is usually measured with specialized equipment, such as the Audio Precision System One. The output signal amplitude is
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