CELT TODO: Difference between revisions

From XiphWiki
Jump to navigation Jump to search
No edit summary
No edit summary
Line 19: Line 19:
** Include energy shape?
** Include energy shape?
** Partial remixing of short blocks?
** Partial remixing of short blocks?
* Dynamic allocation
** Include a way to deviate from the normal bit allocation?
* Better stereo coupling
** Better support for "intensity stereo"?


== Other decisions to make ==
== Other decisions to make ==
Line 28: Line 34:
* Include a configuration packet for more flexibility? (probably not)
* Include a configuration packet for more flexibility? (probably not)
* Use a min width for ebands that's equal to the number of short blocks?
* Use a min width for ebands that's equal to the number of short blocks?
== "Research topics" ==
* Dynamic allocation
* Better stereo coupling

Revision as of 20:44, 14 April 2010

Open issues

  • Spreading/folding
    • Uniform quantisation
    • Control over the amount of spreading/folding introduced
    • Make it have the same shape as the rest of the spectrum
  • Tuning
    • Band layout (spacing)
    • Bit allocation
      • Main table
      • Stereo
      • qtheta offset
      • fine offset
    • Spreading/folding parameter
  • Transients
    • Energy weighting pre- or post-normalization
    • Include energy shape?
    • Partial remixing of short blocks?
  • Dynamic allocation
    • Include a way to deviate from the normal bit allocation?
  • Better stereo coupling
    • Better support for "intensity stereo"?

Other decisions to make

  • Should we use raw bits or now?
  • What should we do about remaining bits after the last PVQ?
    • more fine energy?
    • encode bands backward?
    • allow "fractional pulses"
  • Include a configuration packet for more flexibility? (probably not)
  • Use a min width for ebands that's equal to the number of short blocks?