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FM Distortion (Performance Test) - Keysight
http://cal.software.keysight.com/E8663/Help/fm_distortion.htm#:~:text=FM%20distortion%20is%20defined%20as%20the%20square%20root,is%20made%20directly%20by%20the%208903B%20Audio%20Analyzer.
DISTORTION MEASUREMENT IN AUDIO AMPLIFIERS
https://renardson-audio.com/distortiontest.pdf
this type of instrument, the Radford Series 3 Distortion Measuring Set (Ref.16) has a measurement frequency range of 5 Hz to 50 kHz and is capable of measuring distortion products as low as 0.001 %. An alternatlve method, which to some extent avoids the disadvantages of the distortion factor meter, is the use of a wave analyser.
AES E-Library » Measurement of FM Distortion in …
https://www.aes.org/e-lib/browse.cfm?elib=3221
Gust, "Measurement of FM Distortion in Phonographs," J. Audio Eng. Soc., vol. 27 Issue 3 pp. 121-133, (1979 March.). doi: Abstract: When a pair of tones (400 Hz and 4 kHz) is reproduced by a phonograph, mechanical nonlinear processes cause the 4-kHz tone to be frequency modulated at the 400-Hz frequency deviation using the CBS STR-112 test record is described and it is …
Audio Distortion Measurements - Brüel & Kjær
https://www.bksv.com/media/doc/BO0385.pdf
Distortion is a relative measurement, usually referenced to the linear por tion of the output signal both in ampli tude and frequency. 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).
FM Distortion (Performance Test) - Keysight
http://cal.software.keysight.com/E8663/Help/fm_distortion.htm
FM Distortion FM distortion is defined as the square root of the ratio of the power contained in the harmonics of a demodulated FM waveform to the power of the fundamental component of the demodulated waveform. This is essentially a Total Harmonic Distortion (THD) measurement and is made directly by the 8903B Audio Analyzer.
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.
FM Distortion (Performance Test) (N5173B / N5183A / N5183B ...
https://cal.software.keysight.com/MXG/Help/Content/Performance_Tests_MW/FM_Distortion_PT_MW.htm
This test measures the total harmonic distortion (THD) of an FM signal produced by the DUT. This test supports two equipment setups using either a spectrum analyzer or a measuring receiver. The spectrum analyzer is the preferred solution. The preferred setup uses a spectrum analyzer with Analog Demodulation Measurement Application to both demodulate the signal …
Total Harmonic Distortion - Universal Audio
https://www.uaudio.com/blog/total-harmonic-distortion/
A related measure of distortion is the IMD, or Intermodulation Distortion measurement. IMD is measured by using the sum of two or more sinusoids as an input signal. Typically, the frequencies combined in the input are not harmonically related.
I need help with FM Tuner alignment | diyAudio
https://www.diyaudio.com/community/threads/i-need-help-with-fm-tuner-alignment.325951/
Distortion is measured on a THD meter or spectrum analyzer. Gross distortion can be seen on an oscilloscope. Leave this adjustment alone if you do not have equipment to measure distortion. Pilot canceller is a 19kHz notch filter to remove the pilot signal from the output.
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