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Text File  |  1993-01-27  |  878 b   |  23 lines
  1. Newsgroups: comp.dcom.modems
  2. Path: sparky!uunet!gatech!darwin.sura.net!spool.mu.edu!uwm.edu!psuvax1!postscript.cs.psu.edu!fenner
  3. From: fenner@postscript.cs.psu.edu (Bill Fenner)
  4. Subject: Re: zyxel adpcm to binary data?
  5. Message-ID: <C1J98E.8DG@cs.psu.edu>
  6. Keywords: adpcm-2 adpcm-3 zyxel voice mu-law
  7. Sender: news@cs.psu.edu (Usenet)
  8. Nntp-Posting-Host: postscript.cs.psu.edu
  9. Organization: Penn State Computer Science
  10. References: <C1G8o2.s4@wsrcc.com> <on.728121930@base>
  11. Date: Wed, 27 Jan 1993 22:02:37 GMT
  12. Lines: 9
  13.  
  14. In article <on.728121930@base> on@us.oracle.com (On G. Paradise) writes:
  15. |                delta *= 43. / 32;
  16.  
  17. I've been playing with this for a while, and have found that ZyXEL seems
  18. to do their math using integers, so if you don't round your delta, the
  19. rounding errors end up making your delta diverge from the modem's delta
  20. and you get clipping and/or low volume.
  21.  
  22.   Bill
  23.