vocoder's frequencies values?

    Kasper
    Apr 25 2011 | 12:40 pm
    hi
    I am working on a more/less vocoder idea - for doing so I had a look at the "classic-vocoder" max exemple patch, but also at different other vocoders and have one question :
    _How is made the choice of the values (frequencies) of the bands used in a vocoder? is there a rule here or those (the 15 ones in the exemple) are used because it sounds good?
    thanks
    kasper
    • Roman Thilenius
      Apr 26 2011 | 6:26 am
      third-octave or harmonic series work well, but what you also should try is to _limit the filterbank to a certain range, noone needs frequencies below 50 Hz for speech-to-strings.
      why dont you make it variable?
    • Kasper
      Apr 26 2011 | 7:18 am
      by third-octave you mean +/- 3 notes by octave, right ? but should I repeat the same notes, or rather twist it (kind of C E G# C E G# etc or C F B E A etc) harmonic series make sense
      of course i am making it variable - just wondered what was the reasons for the choices made on the hardware stuff
      many thanks
      kasper
    • Roman Thilenius
      Apr 26 2011 | 9:58 am
      not notes, just a third of an octave, like in the common "31-band equalizer"... 63, 80, 100, 125, 160, 200, 250, ...
      the fixed filterbanks i know are all linear, but i dont know much vocoder hardware when i think about it.