[sdiy] Kawai K3 Waveform ROM's - Update

[Plutoniq9]

I forgot to mention, for each of the graphs I've used the 512-byte samples 
that I de-interleaved from the ROM's for each waveform. The 512-byte sampes 
are stored on every second sample (address-line) in the ROMS (i.e Bit 0, Bit 
2, Bit 4 etc.).

Ryan

>I've done some more investigating with the ROM's. I guess that patend had 
>nothing to do with it after all.
>
>Seems ROM#10 (like ROM#9), has interleaved waveforms within 1024-bytes per 
>waveform (512-byte, 256-byte, 128-byte etc.). In order to find a 
>relationship between the two ROM's, i overlayed screenshots of each pair 
>showing waveshape & FFT spectrum analysis. I covered this for six of the 
>K3's waveforms, (green = ROM#9, red = ROM#10);
>
>Wave 31 (sine) :: http://audiosyn.com/files/K3/Sine%2031.jpg
>Wave 30 (Saw):: http://audiosyn.com/files/K3/sawtooth%2030.jpg
>Wave 29 (Square) :: http://audiosyn.com/files/K3/square%2029.jpg
>Wave 28 :: http://audiosyn.com/files/K3/wave%2028.jpg
>Wave 27 :: http://audiosyn.com/files/K3/wave%2027.jpg
>Wave 25 :: http://audiosyn.com/files/K3/wave%2025.jpg
>
>What's the relationship between them? To me, the red wave's look like 
>(evaluating FFT) that they are hipass filtered versions of the green, but 
>they also seem to be out of phase or shifted? The K3/m uses a hardware 
>based HPF, so it's performing that function of the synth.....but they are 
>definetley realted.....i just can't put my finger on how (completley) & 
>why.
>
>any feedback is anticipated, i'm still stumped (but getting closer).
>
>Thanks
>
>Ryan
>
>
>
>>, I'm guessing RN3QELI03Z is just a resistor ladder (simple DAC) for 
>>controlling VCF cuttoff of th 6 SSM filters (via the 4051B). The two 
>>oscillators (digital waves) have each a seperate DAC (TD62901P).
>>
>>To tell you the truth, I understand the analogue side of the K3 much more 
>>than the digital..... :)
>>
>>What are you hoping to do on the digital side of the K3?
>>
>>Seeya
>>
>>Ryan
>>
>>P.S If someone is following along and needs the schematics, they can still 
>>be downloaded fro my site @ 
>>http://audiosyn.com/files/schematics/Kawai%20K3m%20Schematics.zip
>>>
>>>That patent is utterly uncomprihensible!
>>>
>>>However, great initiative :) I also love the K3 sound. I have some
>>>other questions about the schematics. In the PDF K3m04.pdf from your
>>>schematics pack (thanks man!) down in the lower left corner, there's a
>>>part named RN3QELI03Z. It's between I2 and I22. What does it do?
>>>
>>>I've been trying to figure out how the DCO frequency is controlled,
>>>but I'm not too experienced with reading schematics, and the K3 seems
>>>quite complicated (it's all glue!). Are the wavetable indexes counted
>>>on "discrete" counter ICs somewhere?
>>>
>>>Am I right in thinking that the K3 really uses two separate DAC's, one
>>>for each oscillator?
>>>
>>>Keep up the great work, and good luck!
>>>/Johannes
>>>
>>>On 3/11/07, Plutoniq9 <plutonique9 at hotmail.com> wrote:
>>>>*This didn't seem to post to sdiy when i posted to ah last nite.
>>>>
>>>>Hi,
>>>>
>>>>I've been interested in creating a new waveform ROM set for the kawai 
>>>>K3/m
>>>>for quite a while now and have been making great progress the last few 
>>>>days.
>>>>   However, it uses a method of storing waveforms in a very odd fashion;
>>>>
>>>>- Uses 2 ROM's (#09 & #10) for waveforms, but uses them in
>>>>combination/parallel (not just to extend memory space).
>>>>
>>>>- ROM #09 is 8-bit Unsigned INT 32,768-bytes. Rom#10 is 8-bit Signed INT
>>>>32,768-bytes.
>>>>
>>>>- ROM #09 is 32768-bytes x 8-bit. Each of the 31 waveforms occupies
>>>>1024-bytes of space. Within this 1024-byte space, 5 different octaves of 
>>>>the
>>>>waveform are "interleaved", higher octaves contain less sample data (i.e
>>>>512-bytes, 256-bytes, 128-bytes, 64-bytes, 32-bytes x 2). This is to 
>>>>avoid
>>>>aliasing I imagine.
>>>>
>>>>This much I have figured out. I wrote a small c++ program that has 
>>>>allowed
>>>>me to extract the "base" 512-byte wavefoms from ROM#09. Next step here 
>>>>will
>>>>be to go the other way, convert a 512-byte single-cycle waveform into 
>>>>the
>>>>K3's 1024-byte interleaved format.
>>>>
>>>>HOWEVER........
>>>>
>>>>The second ROM (#10) is still a mystery to me....... The only hunch I 
>>>>got is
>>>>that is may relate to this patent;
>>>>
>>>>http://free.patentfetcher.com/GetPatentPDF.php?f=Pats/US/45/26/US4526081.pdf
>>>>
>>>>But I'm not sure I understand it well enough. If anyone can offer some 
>>>>help,
>>>>it would be greatly appreciated! Ultimate goal is to create replacment 
>>>>Kawai
>>>>K3 wave ROM's containing "cream of the crop" single-cycle waveforms (i.e
>>>>wavestation, prophet VS and various "classic" analogue synth waveforms 
>>>>from
>>>>real machines etc.)
>>>>
>>>>To help, i've created a zip file containing the sine waveforms (both
>>>>de-interleaved and interleaved) from ROM # 9, and the "mystery" 
>>>>1024-byte
>>>>sine from ROM # 10. I'll also include the .bin dumps of both waveform 
>>>>ROM's.
>>>>The big question is......
>>>>
>>>>What the fudge does ROM # 10 have to do with ROM # 09? Is it to extend
>>>>harmonics like in the patent # 4526081?
>>>>
>>>>Zip file can be found at audiosyn.com/files/K3%20mystery%20waveform.zip
>>>>
>>>>Thanks
>>>>
>>>>Plutoniq9
>>
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>
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