1. MARTIN ATKINS pil "This Is Not A Valentine's Party" February 14, 2012 a PUNK SCENE filmed by Video Louis LApunk13

    filmed by
    Video Louis Elovitz
    lapunk13@gmail.com
    lapunk13.com
    I Filmed this WEBCAST of
    the HISTORICAL PUNK SCENE
    with permission

    # vimeo.com/37703050 Uploaded 92 Plays 0 Comments
  2. The WEIRDOS

    Echoplex Los Angeles
    December 13 2013

    Filmed By 

    Video Louis Elovitz 

    lapunk13@gmail.com
    
lapunk13.com
    
THIS WEBCAST HAS ARTISTS' PERMISSION

    # vimeo.com/83131625 Uploaded 132 Plays 1 Comment
  3. MIDI file by Don Carroll.

    This old 24-pin dot matrix printer has been converted into a MIDI compatible sound generator. Up to 21 notes can be played simultaneously. It features up to 16 MIDI channels with individual volume and pitch. Key velocity for every note played is also implemented.

    An Atmega8 and an FPGA are connected to various parts of the original printer main board. The Atmega handles the incoming MIDI messages, communicates with the FPGA and drives the stepper motors for the print head and paper feed. The FPGA is configured to generate lots of pulse-width modulation signals with independent frequency and duty cycle to drive the individual printer pins.

    The external electronics and the printer main board are connected using a normal centronics printer cable and an additional 9-pin connector (the printer cable did not have enough wires).

    The electronics features a standard MIDI DIN connector which is connected to a USB-MIDI converter. It's possible to connect a MIDI keyboard instead of the PC and play live.

    The Atmega firmware responds to all 16 MIDI channels, but this can be reduced to certain channels if the printer is supposed to play together with other sound generators.

    The FPGA is a Xilinx Spartan-3E on a development board ("Spartan-3E Starter Kit"). It is pretty much oversized for the application of generating 21 PWM signals but it's what I had available.

    The original printing frequency was approx. 1kHz with a pulse width of 300µs. So every pin hit the paper at maximum 1000 times per second when printing stuff. The MIDI electronics drives this from a few Hz up to 2kHz.

    When the pulse width is reduced the sound gets quieter because the pin hits the paper with less force. This way "channel volume" and "key velocity" are implemented.

    # vimeo.com/57960146 Uploaded 120K Plays 20 Comments
  4. PUNK ROCK MUSEUM
    SUNSET STRIP PARTY
    July 20 2013

    a film by 
Video Louis Elovitz 
lapunk13@gmail.com 
lapunk13.com 
I Filmed this WEBCAST
of the 
HISTORICAL PUNK SCENE 
with permission

    # vimeo.com/70926037 Uploaded 243 Plays 0 Comments

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