<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Awesome, thanks for the link! I watched the two Youtube demos there, and the timing is not too bad. The viewer indicates 60 fps, so 16 ms per frame. That would also be a limiting factor of course.<div class=""><br class=""></div><div class="">Ben</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 21 Mar 2021, at 03:39, John P Shea <<a href="mailto:info@extrinia.com" class="">info@extrinia.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class=""><div class=""><a href="https://github.com/nai-kon/PlaySK-Piano-Roll-Reader" class="">https://github.com/nai-kon/PlaySK-Piano-Roll-Reader</a></div><br class=""></div><div class=""><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, 20 Mar 2021 at 10:35 pm, Ben Stuyts via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Has anybody ever tried pointing a video camera at the piano roll and do some real-time machine vision type of recognition? Would the resolution (i.e. timing) be good enough?<br class="">
<br class="">
Ben<br class="">
<br class="">
<br class="">
> On 19 Mar 2021, at 23:06, Didrik Madheden <<a href="mailto:nitro2k01@gmail.com" target="_blank" class="">nitro2k01@gmail.com</a>> wrote:<br class="">
> <br class="">
> On Fri, 19 Mar 2021 at 22:29, Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca" target="_blank" class="">jpdesroc@oricom.ca</a>> wrote:<br class="">
>> An optic based reader would look about like this:<br class="">
>> [Image]<br class="">
>> <br class="">
>> Notice the big horizontal LEDs bar over the row of holes in reading..<br class="">
>> <br class="">
>> Not very nice..<br class="">
> <br class="">
> The cable management could be nicer, but I would personally not mind.<br class="">
> But I can see two problems:<br class="">
> 1) It doesn't look original.<br class="">
> 2) Even if you don't care about that, it obscures the currently played<br class="">
> line, which might be aesthetically important.<br class="">
> <br class="">
>> On the other hand a vacuum based reader would look like the original thing:<br class="">
>> [Image]<br class="">
> <br class="">
> Oh! That's something I didn't understand about the mechanism at first.<br class="">
> I thought the vacuum was transmitted through the paper, so that you<br class="">
> would have one "transmitting" side and one receiving side. Instead, it<br class="">
> has constant pressure and relieves the vacuum pressure when a hole<br class="">
> passes over.<br class="">
> <br class="">
> So that gives me a different idea for a working principle based on<br class="">
> light: reflection. No hole=light reflects back. Only one side of the<br class="">
> paper has electronics. This could be done with either a visible LED<br class="">
> (for an additional visualizer effect) or an IR LED (for<br class="">
> authentic-looking operation). This method might be susceptible to<br class="">
> light interference through the holes though... Probably not a good<br class="">
> idea, just throwing ideas out there.<br class="">
> <br class="">
> /Didrik<br class="">
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