laurie wrote:
All oscillators on a CS-80 start out as an invertedsawtooth waveform....then gets processed through a waveshaping chip whereit is split up and sent to different amplifiers including sine....thereis a picture of this process on the hatch of the preset compartment.....invertedsaw leaves pin 7 on IC8 and moves toWave Shape Converter IC9 pins 9, 12and13.....(10,11 pw control)....pin 2 Sine out....pin 5 sawtooth out andpin7 is pulse/square out(I believe pin 3 is triangle out resent to12 and14 to help shape square....)Noise is generated off of the M boardMax Fazio wrote:
Tim !Youdid a great job by making these samples!I achieved similar results witha sample I grabbed fromhttp://personal.inet.fi/private/matador/cs-50_square.mp3(44.1KHz,16bit) Look at the wave.Never seen such a strange square ( but is THIS a square ????). See below;anyway I would be extremely glad to work on your samples but my mailboxcan't bear such attachments so I think it could be better if you can actuallymanage an FTP folder;-)Thx again!!!M----- Original Message -----From:TimSiefkesSent: Friday, December 02, 2005 4:25AMSubject: Re: [yamahacs80] Square waveOkay.. to Max and ohesh (in Germany),I have sampled the square wave output from my CS80 into a pair of .WAVfiles, sampled at 192,000 khz 32-bit resolution.
The first file is a ten-second recording of the lowest "C" at the 16'setting, the lowest ordinary note you can play on the CS.
The second file is about a five-second sample made after sweeping thepitch down on the ribbon controller to where it sounds like discrete clicks.
Filters were wide open, no modulation or outside effects were used.Looking at these in my waveform display they do not look much like asquare wave at all! I'm attaching a small screenshot of the waveform Isee. Hopefully it will come through to the group. Do you want me to e-mailthese files to you directly? These .WAV files weigh in at 7.5 MB and 4.5MB respectively. I also combined them into a Zip archive which is about8.8 MB for the two of them together. I don't want to overwhelm anyone'smailbox with large attachments. The other alternative is I could post themto an FTP location where they could be grabbed at your own leisure. Pleaselet me know how I can best get these files to you.
-Tim S.
<Minneapolis>Max Fazio wrote:
Thankyou so much ! Correctly my friend Laurie wrote me that the audio resultof the pure wave could be heavily affected by the actual settings of thefilters' trimmers into each M-board.I'm aware of it and I will do my experiencehaving the final results on a statistical shape.I recently analysed thesine wave into the ring modulator and ended up with some correct datas( or at least as less approximated as I could ).Well, the sine wave I canhear into the modulation wave ( and in the PWM , SubOsc and within ChorusLFOs) isn't a plain sine: it consists of a "wrong" sine wave with a singleharmonic tuned 2oct upper and with 4% of the total amplitude, I was ableto reproduce it digitally with a common FFT generator : this implies thefact that , within ringmodulation there is something like a "hidden" sinewhich modulates the signal togheter with the fundamental at two octavesupper....that's why its sound is SO rich!!Thx again for your help!Max