The effect was acousticaly pleasing to the ear and simpler to do than a switching loss reduction scheme which would have been needed for 20KHz.If you want to keep things basic then varnish can and does reduce coil acoustic noise.
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If youre wanting to know how to convert aax to m4b/m4a theres programs like inAudible and AAX Audio. Thank you In response to your feedback here and on other forums, I have. Version 1.1, published three weeks ago, had quite a few downloads. The slow IGBTs were cheap and had lower conduction losses. Audible Converter Top 5 Audible Audiobook. Version 1.2 of AAX Audio Converter is now available.
This gaussian phase noise approach was done by a manufacturer of large 3 phase Induction motor drives that hard switched with slow IGBTs. You could place gaussian phase noise on your PWM which will spread the spectrum making the scream appear to fade into the background. If your coil is saturating it will scream louder than normal. Intended primarily for audio books, but anything with decent folder structure. Audioserve - Simple personal server to serve audiofiles files from folders.
So you can do something at 20KHz or more which is very easy these days and then you wont have to worry about noise from the coil.If you must do this 3.9 KHz you can make the flux density in the coil low by using lots of inductance and a physically large coil. AaxAudioConverter - Convert Audible aax files to mp3 and m4a/m4b Audnexus.bundle - An audnexus client, providing rich author and audiobook data to Plex via its legacy plugin agent system.
Almost all switchmode convertors run at 20KHZ or more to make the Acoustic noise inaudible to the human ear.Even in the days of slow germanium power transistors this was done albeit with an efficiency reduction.
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