From: bagel99@gmail.com   
      
   On 9/6/25 11:59 AM, David Schultz wrote:   
   > On 9/6/25 5:28 AM, BGB wrote:   
   >>     8000: Very poor, speech almost unintelligible (normally).   
   >>       But, it is seeming like a "weird hack" may exist here.   
   >   
   > You might want to look at how AT&T did it. It has been a while but I think   
   this   
   > is near what they used. Back when phones were analog and digital was just   
   > getting started.   
   >   
   That was T1 carrier.  When I looked at the schematics, I was surprised to see   
   the audio compression was done in analog, using the exponential curve of a   
   diode to get logarithmic compression.  If I remember correctly:-)   
      
   Brian   
      
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