Left Foot Posted July 13, 2016 Share Posted July 13, 2016 (edited) Hi there brainy people. I'm hoping you can tell me what I need to solder together... How can I take an audio signal and convert it into a visual signal. Or what variants on that audio/visual syncopation are possible and in what format? I basically need to know what Transducers to use and if these are common within a certain type of box / gizmo / device. Looking on Wiki - I need a circuit featuring an Electroacoustic transducer running into a Cathode-ray tube (CRT) : meaning that I can plug a normal jack lead into this circuit and get an audio (Hdmi/SVGA/VGA) out - which can then be plugged into a projector for example... Is there anything out there that does that? Edited July 13, 2016 by Left Foot Quote Link to comment Share on other sites More sharing options...
rmorris Posted July 13, 2016 Share Posted July 13, 2016 [quote name='Left Foot' timestamp='1468408003' post='3090699'] Hi there brainy people. I'm hoping you can tell me what I need to solder together... How can I take an audio signal and convert it into a visual signal. Or what variants on that audio/visual syncopation are possible and in what format? I basically need to know what Transducers to use and if these are common within a certain type of box / gizmo / device. Looking on Wiki - I need a circuit featuring an Electroacoustic transducer running into a Cathode-ray tube (CRT) : meaning that I can plug a normal jack lead into this circuit and get an audio (Hdmi/SVGA/VGA) out - which can then be plugged into a projector for example... Is there anything out there that does that? [/quote] Not clear on what type of visual display or image you're looking to get. CRT probably a bit outdated ??? Quote Link to comment Share on other sites More sharing options...
Huge Hands Posted July 13, 2016 Share Posted July 13, 2016 Surely there must be laptop software/apps that do this? Quote Link to comment Share on other sites More sharing options...
Dad3353 Posted July 13, 2016 Share Posted July 13, 2016 [quote name='Left Foot' timestamp='1468408003' post='3090699']... Is there anything out there that does that? [/quote] Like this..? Reaper (on a laptop, for portability..?), doing FFT audio analysis. An oscilloscope will do this, of course, but one with VGA o/p is likely to cost £5000 or so. Quote Link to comment Share on other sites More sharing options...
Left Foot Posted July 13, 2016 Author Share Posted July 13, 2016 (edited) mmorris - Any kind what so ever, just a strobe light flicker or anything - general Huge - Maybe, but I forgot to mention Id like to do this analogue. Dad- I have no idea what that is! Is that the post Brexit stock market? Yeah not so much an [color=#282828][font=helvetica, arial, sans-serif]oscilloscope but any other visual signal.[/font][/color] [color=#282828][font=helvetica, arial, sans-serif] [/font][/color] Edited July 13, 2016 by Left Foot Quote Link to comment Share on other sites More sharing options...
Dad3353 Posted July 13, 2016 Share Posted July 13, 2016 [quote name='Left Foot' timestamp='1468418806' post='3090805']... Dad- I have no idea what that is! Is that the post Brexit stock market? [/quote] Well it was going to be my contribution to the July Basschat Composition Challenge, but maybe I should reconsider..? On topic, what exactly would you like to see on this screen (take a virtual pencil and sketch something to show us what you want..?). Quote Link to comment Share on other sites More sharing options...
Norris Posted July 13, 2016 Share Posted July 13, 2016 Windows media player used to have a "Visualiser" that generates graphics on the fly from an audio track. I don't think it has a way to do it on live audio but there is bound to be some software out there that can. As for going analogue, that won't be easy to do much more than simple volume-related i.e. signal voltage. More complex might be possible with band-pass flters - which would need a bit of reading and research. But then how would you feed it into the monitor. I think I'd forget about modifying a CRT unless you really know what you are doing - there are some pretty high voltages therein! Quote Link to comment Share on other sites More sharing options...
Left Foot Posted July 13, 2016 Author Share Posted July 13, 2016 Well this is for a drone project, where we take a signal generator and modulate it. I usually have some prepared visuals going on in the background that loosely relate to the 'story arc' of the drone. But I'm after some more in sync and connected, for example. I'm checking out James Alex Hardy's work, seems 'simple' enough... Quote Link to comment Share on other sites More sharing options...
DaveFry Posted July 13, 2016 Share Posted July 13, 2016 Analogue ? Superglue a small mirror / tinfoil to an old speaker ( maybe a car speaker ) and shoot cheap pen lasers at it . Quote Link to comment Share on other sites More sharing options...
Norris Posted July 13, 2016 Share Posted July 13, 2016 A microswitch fitted on the bass drum pedal? Quote Link to comment Share on other sites More sharing options...
Passinwind Posted July 22, 2016 Share Posted July 22, 2016 Google "light organ." Many pro lighting fixtures already have variations on this function built in.. Quote Link to comment Share on other sites More sharing options...
taunton-hobbit Posted July 22, 2016 Share Posted July 22, 2016 Many years ago a guy built me the worlds first sound to light chassis (I'm deadly serious, this came out of several long conversations about the 'new' thyristors) - circuit seemed to consist of a couple of speaker crossovers and a lot of post-signal circuitry - the result was four different colour flashing bulbs along with the music. Quote Link to comment Share on other sites More sharing options...
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