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Thread: The LaserBoy Thread

  1. #411
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    After some searching, it seems there are USB audio in ADC devices, none of which pass DC, voltage data loggers which do capture DC, but don't export to .wav files, and a few suggestions involving DIY platforms and ADC chips. Thank you all, by the way, for considering the question and the discussion related to sound cards. I'd rather not try to solve this by modifying sound cards though. At this time it seems the voltage data logger approach is the way to go. After requesting information, I was contacted by an engineer from one of the providers of voltage data loggers, and some of the devices have sampling rates up to 50 kHz, which should be adequate for a 44.1kHz wave file. The data is exported as a .csv file, which will require some code to assemble this into a .wav file, but I already have written code that does something similar.

    James, you mentioned that some studio equipment is able to digitize DC. Any idea what that type of gear would be called?

    Regarding the signals produced by the cycloid generators, since the images are not necessarily symmetric, recording these through capacitively coupled inputs results in the images' center of gravity, as it were, constantly drifting toward the origin, which does not look good. Also, these devices can function both as image generators, and offset generators. For example, the Digital Offset GeNerator (DOGN) board include effects such as ping-pong, random positions, and swooping motion paths which do not in any way perform as intended without the DC being preserved.

    For those who haven't seen this yet, the following link is to a short video documenting the output from the DOGN code, in which it can be seen that there is DC which needs to be captured properly.

    https://www.youtube.com/watch?v=fJ7kAR7D8yU

  2. #412
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    If your ADC data loggers put out .cvs comma separated values, LaserBoy can read formatted ascii text tables. So you could just open it in LaserBoy and do whatever you want to it and save it as wave or ilda or a set of numbered bitmaps to compile into a video, etc...

    A quick search reveals there are several computer sound interfaces that can record synthesizer control voltages.
    Last edited by james; 01-09-2021 at 16:33.
    Creator of LaserBoy!
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  3. #413
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    Mar 2010
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    That is useful to know. Looks like a voltage data logger + LaserBoy is the answer.

  4. #414
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    LaserBoy is always the answer.
    Creator of LaserBoy!
    LaserBoy is free and runs in Windows and Linux (including Raspberry Pi!).
    Download LaserBoy!
    YouTube Tutorials
    Ask me about my LaserBoy Correction Amp Kit for sale!
    Either do or do not do. There is no undo!

  5. #415
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    I have a dc modified black face ADAT machine and an Echo Layla 24/96 with ADAT Light Pipe in/out. So I can record 8 x 16-bit 48KHz with dc offsets. I modified my ADAT in late 2003. The Layla is super easy to modify for dc out. I haven't tried to mod it for dc in. But it is differential in and out. So it's probably doable.
    Creator of LaserBoy!
    LaserBoy is free and runs in Windows and Linux (including Raspberry Pi!).
    Download LaserBoy!
    YouTube Tutorials
    Ask me about my LaserBoy Correction Amp Kit for sale!
    Either do or do not do. There is no undo!

  6. #416
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    Mar 2012
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    DZ on this forum knows a hell of a lot about all this.
    Creator of LaserBoy!
    LaserBoy is free and runs in Windows and Linux (including Raspberry Pi!).
    Download LaserBoy!
    YouTube Tutorials
    Ask me about my LaserBoy Correction Amp Kit for sale!
    Either do or do not do. There is no undo!

  7. #417
    Join Date
    Sep 2014
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    Colorado USA
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    Quote Originally Posted by Greg View Post
    After some searching, it seems there are USB audio in ADC devices, none of which pass DC, voltage data loggers which do capture DC, but don't export to .wav files, and a few suggestions involving DIY platforms and ADC chips. Thank you all, by the way, for considering the question and the discussion related to sound cards. I'd rather not try to solve this by modifying sound cards though. At this time it seems the voltage data logger approach is the way to go. After requesting information, I was contacted by an engineer from one of the providers of voltage data loggers, and some of the devices have sampling rates up to 50 kHz, which should be adequate for a 44.1kHz wave file. The data is exported as a .csv file, which will require some code to assemble this into a .wav file, but I already have written code that does something similar.

    James, you mentioned that some studio equipment is able to digitize DC. Any idea what that type of gear would be called?

    Regarding the signals produced by the cycloid generators, since the images are not necessarily symmetric, recording these through capacitively coupled inputs results in the images' center of gravity, as it were, constantly drifting toward the origin, which does not look good. Also, these devices can function both as image generators, and offset generators. For example, the Digital Offset GeNerator (DOGN) board include effects such as ping-pong, random positions, and swooping motion paths which do not in any way perform as intended without the DC being preserved.

    For those who haven't seen this yet, the following link is to a short video documenting the output from the DOGN code, in which it can be seen that there is DC which needs to be captured properly.

    https://www.youtube.com/watch?v=fJ7kAR7D8yU
    Greg, is there a more complete 6502 assembly code listing to that shown in the video?
    ________________________________
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