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Thread: CYGN-B

  1. #861
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    Wow those are really ugly. One technique I used was to pump up the gain like 30 db (or more) and then clip it back down to move things back near a bipolar square wave.
    "There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso

  2. #862
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    Here's an analysis of an ADAT show that had no trouble yielding quality data.


    length of audio segment of data for Flashback80s = 23:36


    data frames collected = 59732


    so
    23:36 = 1416 seconds


    and
    1416 seconds x 40 fps = 56,640


    which shows more frames collected than maximum possible if the data is an accurate 40 fps.


    conclusion: The poor signal is from The Doors tape. Which is too bad, but some other shows are fine.
    Attached Thumbnails Attached Thumbnails track_4_signal_better_ADAT.png  


  3. #863
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    Problem solved! Full Doors data recovered. Following line of code was all that was needed:

    // reject a range of values
    if ((aByte < -1) || (aByte > 1))

  4. #864
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    Here is an excerpt to make scholarly points about laser shows.

    https://www.youtube.com/watch?v=JRTmLngpfos
    Attached Thumbnails Attached Thumbnails wall_excerpt.jpg  


  5. #865
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    Quote Originally Posted by Greg View Post
    Here is an excerpt to make scholarly points about laser shows.

    https://www.youtube.com/watch?v=JRTmLngpfos
    And I think there are many scholarly examples of good laser show points in this excerpt. Nice work.
    ________________________________
    Everything depends on everything else

  6. #866
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    Ron correctly observed a few posts ago that I haven't proven the KQO works in the 4 channel system yet. This video does that. https://www.youtube.com/watch?v=r09_2HxrQo4

    Missing is the effect where it looks like there is a sinusoid imposed on the amplitude of the spiral on the way down. I'm not sure if that would be the effect of the Burr Brown chip shaping the spiral ramp, or if that is something else.

    I'm posing this before I look again at the schematics, but I'm wondering, did the PDM signal sometimes suppress the KQO reset? Or was the KQO always "keyed" by a free running on board 555?
    Attached Thumbnails Attached Thumbnails quad_KQO.jpg  


  7. #867
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    In that Dark Side number we used swept diamond spirals. My memory of most of our choreography isn't the best (I haven't done a show for 25 years!). However, since I performed Dark Side more than 3000 times, by my estimation, THAT show's choreography remains a bit clearer. I think I performed that album WAY more than the group ever performed it! And I STILL love that album!

    Your KQO's look perfect!

    Ron

    Quote Originally Posted by Greg View Post
    Ron correctly observed a few posts ago that I haven't proven the KQO works in the 4 channel system yet. This video does that. https://www.youtube.com/watch?v=r09_2HxrQo4

    Missing is the effect where it looks like there is a sinusoid imposed on the amplitude of the spiral on the way down. I'm not sure if that would be the effect of the Burr Brown chip shaping the spiral ramp, or if that is something else.

    I'm posing this before I look again at the schematics, but I'm wondering, did the PDM signal sometimes suppress the KQO reset? Or was the KQO always "keyed" by a free running on board 555?

  8. #868
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    KQO was free running.
    "There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso

  9. #869
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    Quote Originally Posted by Greg View Post
    Ron correctly observed a few posts ago that I haven't proven the KQO works in the 4 channel system yet. This video does that. https://www.youtube.com/watch?v=r09_2HxrQo4

    Missing is the effect where it looks like there is a sinusoid imposed on the amplitude of the spiral on the way down. I'm not sure if that would be the effect of the Burr Brown chip shaping the spiral ramp, or if that is something else.

    I'm posing this before I look again at the schematics, but I'm wondering, did the PDM signal sometimes suppress the KQO reset? Or was the KQO always "keyed" by a free running on board 555?
    You could select the signal for the CYGN-B at the input to it's master gain, or CYGN-B & A at the input to the CYGN-A's master gain for spirals. (among others) By selecting CYGN-A the "sinusoid" is obviously a low freq analog osc.
    "There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso

  10. #870
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    Quote Originally Posted by laserist View Post
    You could select the signal for the CYGN-B at the input to it's master gain, or CYGN-B & A at the input to the CYGN-A's master gain for spirals. (among others) By selecting CYGN-A the "sinusoid" is obviously a low freq analog osc.
    Ahh, that makes sense. I need to go back into the circuits and add some breakouts for the oscillator signals and spiral ramp input in order to actually implement this and the other functions driven by the oscillators besides just the XY. To be clear, do the signals taken from the oscillator banks get summed with the resettable spiral ramp signal? Or do the signals get used instead of the spiral ramp signal?

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