How does DTMF work?

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Tags

  1. #pressed
  2. #controller
  3. #micro
  4. #decoder
  5. #technology
  6. #tones
  7. #generates
  8. #frequencies
  9. #these
  10. #decoded
  11. #which
  12. #keypad
  13. #mobile
  14. #generate
  15. #called
  16. #column
  17. #button
  18. #phone