CYGN-B

[Greg]

A useful archaeological discovery has been sitting unnoticed right in front of me. There is a video available on line of a laser show for Spirit of Radio by Rush. Here is the link to the video:

https://www.youtube.com/watch?v=DlFh2FCxn44

It turns out this is the same data as the emulated version I posted recently. This is a perfect opportunity to compare some subtleties of emulator performance that I have been wondering about for a while. Things such as, when exactly do the dynamic offsets, as opposed to the dogloids, appear? And more importantly, are my spiral in and out responses in the right range, and have I got the inverse and diamond routing correct? Not to mention this is a chance to inspect what the show steps signal is actually calling up regarding scan glasses and lumia effects.

Ron, you're welcome to throw a PIN file at me if you happen to come across one of this, though I haven't yet had success at interpreting the cryptic cycloid presets as given.

[dchammonds]

A useful archaeological discovery has been sitting unnoticed right in front of me. There is a video available on line of a laser show for Spirit of Radio by Rush. Here is the link to the video:

https://www.youtube.com/watch?v=DlFh2FCxn44

It turns out this is the same data as the emulated version I posted recently. This is a perfect opportunity to compare some subtleties of emulator performance that I have been wondering about for a while. Things such as, when exactly do the dynamic offsets, as opposed to the dogloids, appear? And more importantly, are my spiral in and out responses in the right range, and have I got the inverse and diamond routing correct? Not to mention this is a chance to inspect what the show steps signal is actually calling up regarding scan glasses and lumia effects.

Ron, you're welcome to throw a PIN file at me if you happen to come across one of this, though I haven't yet had success at interpreting the cryptic cycloid presets as given.

Thanks for posting that link, it's amazing to see how it was done years ago!

[lasermaster1977]

A useful archaeological discovery has been sitting unnoticed right in front of me. There is a video available on line of a laser show for Spirit of Radio by Rush. Here is the link to the video:

https://www.youtube.com/watch?v=DlFh2FCxn44

Thanks for sharing Greg. The YT video is a great example of how much expressive ability there was with 4 XY scan pairs, one each for the four primary colors, R, Y, G, & B and each with XY axis inverting, quadrature DC offset capability mixed in, also with axis inverting or non-inverting per color XY axis, beam on/off blanking (modulation), stationary and rotating diffraction gratings flipped into the scanned beam(s).

I'll take 4 XY pairs over one any day for my laser presentation palette.

[Greg]

Thanks for sharing Greg. The YT video is a great example of how much expressive ability there was with 4 XY scan pairs, one each for the four primary colors, R, Y, G, & B and each with XY axis inverting, quadrature DC offset capability mixed in, also with axis inverting or non-inverting per color XY axis, beam on/off blanking (modulation), stationary and rotating diffraction gratings flipped into the scanned beam(s).

I'll take 4 XY pairs over one any day for my laser presentation palette.

And one of the neat thing from my perspective, is that all that 4 channel stuff you are identifying that for decades has remained inimitable, now exists in a mere 60K of C++ code, and as we have seen it makes no difference to the eye which system is being viewed, obvious points such as missing yellow and lumia and scanner hysteresis notwithstanding. Might it be said that I implemented Ivan's formula?

[laserist]

Well, I might split hairs and say you've implemented Charlie's vision, but in any case I'm sure happy to see your progress!

[Greg]

Well, I might split hairs and say you've implemented Charlie's vision, but in any case I'm sure happy to see your progress!

That's a good point actually. Noted.

[lasermaster1977]

And one of the neat thing from my perspective, is that all that 4 channel stuff you are identifying that for decades has remained inimitable, now exists in a mere 60K of C++ code, and as we have seen it makes no difference to the eye which system is being viewed, obvious points such as missing yellow and lumia and scanner hysteresis notwithstanding. Might it be said that I implemented Ivan's formula?

Indeed it should be said!

It is just so impressive what today's MCUs (and programmers) can yield in C++ code and compact code at that.

[ronhip]

A useful archaeological discovery has been sitting unnoticed right in front of me. There is a video available on line of a laser show for Spirit of Radio by Rush. Here is the link to the video:

https://www.youtube.com/watch?v=DlFh2FCxn44

It turns out this is the same data as the emulated version I posted recently. This is a perfect opportunity to compare some subtleties of emulator performance that I have been wondering about for a while. Things such as, when exactly do the dynamic offsets, as opposed to the dogloids, appear? And more importantly, are my spiral in and out responses in the right range, and have I got the inverse and diamond routing correct? Not to mention this is a chance to inspect what the show steps signal is actually calling up regarding scan glasses and lumia effects.

Ron, you're welcome to throw a PIN file at me if you happen to come across one of this, though I haven't yet had success at interpreting the cryptic cycloid presets as given.

Greg,

Since you insist. Here's the best LaserRush PIN sheets money can buy. MUCH better than most of what I have.

Ron

[Greg]

There's actually yet another huge trove of information that has been sitting unnoticed in front of me until a week ago. That would be the voice track that exists on some of the tapes.

I'm over half through a campaign to obtain a standard good quality transfer of all the 1/4" show tapes, including the voice tracks when they exist. The photo shows the circuitry that is needed because the signals produced by the tape deck are way too weak to give a good level on the HD24 ADAT machine. It's mostly the quad op amp in the lower right, and a patch mid left which processes the raw 352 signal. The rest is the unused spiral and audiomod circuits.

A few especial goodies have been located. One, the box for the Rush show says there is a "bonus song" following the walkout music, which I almost overlooked. Even better though, The John Williams show contains narrated data test segments hidden on tracks 3 and 4 behind the walk in music, and following the walk out. Here's the link to a video:

https://www.youtube.com/watch?v=Tfkwfo8MAUg

[ronhip]

There's actually yet another huge trove of information that has been sitting unnoticed in front of me until a week ago. That would be the voice track that exists on some of the tapes.

I'm over half through a campaign to obtain a standard good quality transfer of all the 1/4" show tapes, including the voice tracks when they exist. The photo shows the circuitry that is needed because the signals produced by the tape deck are way too weak to give a good level on the HD24 ADAT machine. It's mostly the quad op amp in the lower right, and a patch mid left which processes the raw 352 signal. The rest is the unused spiral and audiomod circuits.

A few especial goodies have been located. One, the box for the Rush show says there is a "bonus song" following the walkout music, which I almost overlooked. Even better though, The John Williams show contains narrated data test segments hidden on tracks 3 and 4 behind the walk in music, and following the walk out. Here's the link to a video:

https://www.youtube.com/watch?v=Tfkwfo8MAUg

Greg,

I just have to say again that your breadboard electronics are a wonder to behold. Art of the highest form! Chaos that brings order.

Ron