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My Mixer design thesis.....

Discussion in 'TRIBE Main Forum' started by ADT, Mar 7, 2002.

  1. ADT

    ADT TRIBE Member

    So I completed my design thesis, and have gotten official credit for the concept..

    so I can now talk about it at least..

    essentially the idea was to redesign the crossfader using digital filtering instead of analog filtering.

    thereby allowing the dj have band-specific mixing curves..

    i.e. you could have a sharp curve on the lows if you just wanted to cut between basslines while leaving the mids and the highs fully in the mix..

    you could also move the curves left and right if you say wanted overlap in the middle (or not)..

    i got it to work for low frequencies, but i didnt really have the time or $$$ to build a real audio capable version..

    that, and my stupid partner bought the wrong ADCs.. %^+*&$

    anyway.. we got an A.. which is a relief

    what do you think? worthwhile design?

  2. Adam Duke

    Adam Duke TRIBE Member

    Cool idea - kind of like kill switches but with the crossfader, right? I assume that would be the most obvious approach to the tool anyways..

    Can you post any pics now?

  3. sentence

    sentence TRIBE Promoter

    I forget who makes it but there is a mixer on the market that has separate cross faders for the lows, mids, and highs.

    It's a good concept.
  4. ADT

    ADT TRIBE Member

    i had to return the main FPGA(field programmable gate array) to the school.. and didnt bother with a photo..

    actually the truth is that i didnt get the f%$$@$% thing working until the night before the presentation because i couldnt figure out why i couldnt get any decent HF response, since my partner told me his ADCs were good for audio..

    it wasnt till i wrote up the report that i realized what the problem was..

    but it wasnt much to look at anyway.. all the controls were simulated on my computer so there was actually no physical crossfader or nobs or anything! for that matter except a bigass breadboard and an fpga..


    this is the board i used.. basically hooked up to my computer with a couple of ADCs attached to it (analog digital converters) and a DAC (dig. analog. conv.) for the output..

    and thats basically it..


    ironically hard trance ( :D ) gave me the idea because of the driving lows and melodic mids.. people never cut it quickly like techno djs do back and forth because the melodys get all fucked..

    with this design you could.. :)
  5. ADT

    ADT TRIBE Member

    this concept is better than that..

    A - you can also move the curves left and right to control overlap

    B- 3 faders are a bitch..

    1 fader that you can have presets for is so much better

    the advantage of digital over analog!
  6. sentence

    sentence TRIBE Promoter

    what type of class was this for?
  7. Subsonic Chronic

    Subsonic Chronic TRIBE Member

    sweet. :)

  8. ADT

    ADT TRIBE Member

    It is my 4th year Elec. Eng. design thesis.. we all have to do one.. basically anything we want as long as it incorperates digital design...
  9. C-NiCE

    C-NiCE TRIBE Promoter

    I think this is the fader you're talking about. Made by Red Sound.


  10. [- FuNKtiOn -]

    [- FuNKtiOn -] TRIBE Member

    ^^that mixer

    I want it!
    anyone know how much one of these bad boys would cost?
  11. C-NiCE

    C-NiCE TRIBE Promoter

    ^^^I think they go for around 300-350 pounds. Never seen one here though. Is this similar to what you were trying to build ADT?

  12. ADT

    ADT TRIBE Member

    yes and no..

    instead of having 3 faders.. you have one fader, but you can preset the curves to whatever shape you want for each band..

    so if you want the bass-lines to swap instantaneously without fucking with kills but to keep the melodys mixed you set a sharp curve on the lows with no overlap and then just move the fader across..
  13. labRat

    labRat TRIBE Member

    why didn't you use a DSP instead - you could've set up a bunch of FIR and IIR filters and change the number of taps or the coefficients to produce whatever kind of curve you wanted.

    you could've easily modelled it in matlab and then write it in ansi c and compile to a dsp.

    but you're done now and got an A for it. i remember you mentioning this a while back and you wanted to market it or somethin' - is this still the case?

  14. ADT

    ADT TRIBE Member

    i would have liked to use a dsp, but part of the project requirments were that the core functions had to be coded in VHDL, thus the use of the FPGA
  15. sentence

    sentence TRIBE Promoter

    That Red Sound mixer was the one I was talking about.

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