Harmonics and Hum
![](https://www.marlinmag.com/wp-content/uploads/2021/09/sport-fishing-boat-on-water-6.jpg)
![](https://www.researchgate.net/profile/Aaron-Rice-2/publication/261745244/figure/fig3/AS:392419477606406@1470571502627/Harmonic-quality-of-midshipman-growl-The-spectrogram-A-shows-prominent-harmonics_Q320.jpg)
Midshipman hum. Sonogram (A) and waveform (B) of a hum segment
![](https://essentia.upf.edu/_images/tutorial_audioproblems_humdetector_5_0.png)
Humming noise detection — Essentia 2.1-beta6-dev documentation
![](https://media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs12647-021-00454-0/MediaObjects/12647_2021_454_Fig4_HTML.png)
Measurement Uncertainty in Primary Calibration of Accelerometer Complex Sensitivity at Low Frequencies
Are trumpets like harmonicas where you need more than one to get all notes? - Quora
![](https://community.element14.com/resized-image/__size/1200x900/__key/communityserver-blogs-components-weblogfiles/00-00-00-02-51/6507.contentimage_5F00_131805.png)
Synthetic Mains Hum Noise - element14 Community
![](https://www.ap.com/fileadmin-ap/Blog/FFRT-and-Distortion-Product-Ratio-right.png)
THD and THD+N – Similar, but not the same: Audio Precision
![](https://www.istitutomontani.edu.it/museovirtuale/wp-content/uploads/2020/03/2IMGCPFaPa6693.jpg)
radiotecnica Archivi - Pagina 2 di 33 - Museo Virtuale ITT Montani
![](https://cdn.hackaday.io/images/resize/600x600/1200641645632625907.jpg)
Testing: TF1101 - R-C Oscillator - Yey or Ney ?
![](https://precisionproptech.com/wp-content/uploads/2017/11/veemsuperyacht.png)
VEEM Propellers - Precision Prop Technology
![](https://www.autom8.com/webrotate/humbug/images/01.jpg)
Quest Hum Bug Noise Eliminator - AutoMate Scientific
![](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Erfurt_Bell.png/220px-Erfurt_Bell.png)
Strike tone - Wikipedia
![](https://m.media-amazon.com/images/I/51QlhE6YQbL.jpg)
Electro-Harmonix Hum Debugger Hum Eliminator Pedal : Musical Instruments
![](https://www.lollarguitars.com/blog/wp-content/uploads/harmonics-string-vibration-patterns.jpg)
definition of harmonics
![](https://www.grandermarlin.com/wp-content/uploads/2019/08/VisionsOfGranders3.png)
Captain Chris Donato of Grander Marlin Sportfishing - Kailua-Kona, Hawaii
![](https://cdn.hackaday.io/images/resize/300x200/8374421484063667441.jpg)
Testing: TF1101 - R-C Oscillator - Yey or Ney ?