🚀 go-pugleaf

BS>>  Would someone (Bill?)  mind giving an explanation of deemphasis, how it is
BS>>done, the reason for doing it, what is done the the signal, etc.?  Thanks.

  Your explanation left out the reason why pre- and de-emphasis is necessary.  The media on which we record (magnetic and essentially-obsolete vinyl) increases noise in the mid- and upper-treble.  Pre-emphasis increases signal strength in this frequency range to maintain the Signal to Noise Ratio (SNR).  During playback, de-emphasis restores the balance between Treble, Mudrange, and Bass.
  The Bass signals are often too strong and would overload recording media, so the signal strength is reduced (SNR is not a major consideration in this frequency range).  During playback, the Bass frequencies are boosted to resotre their balance with the Midrange and Treble.

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Jeff Lindstrom
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