4 ms·

I also seem to recall photos-sound, but have yet to rediscover it via web search.

eesmith 4y ago
Laser turntable, 1970s - https://en.wikipedia.org/wiki/Laser_turntable https://en.wikipedia.org/wiki/Laser_turntable , which goes on: > The [1980s production] prototype revealed an interesting flaw of laser turntables: they are so accurate that they "play" every particle of dirt and dust on the record, instead of pushing them aside as a conventional stylus would. In the same Wikipedia entry: > A similar technology is to scan or photograph the grooves of the record, and then reconstruct the sound from the modulation of the groove revealed by the image. Research groups that developed this technology include: IRENE is the one used by the Smithsonian. https://irene.lbl.gov/links/audio-files-for-june-24-2021-presentation-carl-haber/ https://irene.lbl.gov/links/audio-files-for-june-24-2021-pre... has some of the recordings recovered by IRENE. I've wondered if regular cameras would get good enough that you could take a picture of a record with your phone and have it play the sound. IRENE and VisualAudio links show that a microscope is needed, so no, it doesn't seem "phone"-o-graphic playback will be any time soon.
- IndySun 4y ago
  Thank you. I'm hoping IRENE gets discussed in detail here. We will eek out someone qualified to elaborate on Laser Turntables. https://www.bl.uk/events/unlocking-our-sound-heritage-inspire-enable-preserve https://www.bl.uk/events/unlocking-our-sound-heritage-inspir...
- eesmith 4y ago
  https://doc.rero.ch/record/7958/files/StotzerS.pdf https://doc.rero.ch/record/7958/files/StotzerS.pdf is a PhD thesis for VisualAudio. It says "To get a good audio quality, a resolution of about 1 μm is needed, which would mean 25000 dpi." Yeah, it's going to be a while before phones get there! Also, here's Heine's 1977 laser scanning phonograph paper - https://www.aes.org/e-lib/browse.cfm?elib=3098 https://www.aes.org/e-lib/browse.cfm?elib=3098 . Here's a Saphir paper - https://hal.science/hal-01885324/ https://hal.science/hal-01885324/ . Here's an approach using an off-the-shelf scanner - https://www.aes.org/e-lib/browse.cfm?elib=16071 https://www.aes.org/e-lib/browse.cfm?elib=16071 (the VisualAudio PhD thesis mentions these as having lower quality).

Laser turntable, 1970s - https://en.wikipedia.org/wiki/Laser_turntable https://en.wikipedia.org/wiki/Laser_turntable , which goes on: > The [1980s production] prototype revealed an interesting flaw of laser turntables: they are so accurate that they "play" every particle of dirt and dust on the record, instead of pushing them aside as a conventional stylus would. In the same Wikipedia entry: > A similar technology is to scan or photograph the grooves of the record, and then reconstruct the sound from the modulation of the groove revealed by the image. Research groups that developed this technology include: IRENE is the one used by the Smithsonian. https://irene.lbl.gov/links/audio-files-for-june-24-2021-presentation-carl-haber/ https://irene.lbl.gov/links/audio-files-for-june-24-2021-pre... has some of the recordings recovered by IRENE. I've wondered if regular cameras would get good enough that you could take a picture of a record with your phone and have it play the sound. IRENE and VisualAudio links show that a microscope is needed, so no, it doesn't seem "phone"-o-graphic playback will be any time soon.

IndySun 4y ago
Thank you. I'm hoping IRENE gets discussed in detail here. We will eek out someone qualified to elaborate on Laser Turntables. https://www.bl.uk/events/unlocking-our-sound-heritage-inspire-enable-preserve https://www.bl.uk/events/unlocking-our-sound-heritage-inspir...
eesmith 4y ago
https://doc.rero.ch/record/7958/files/StotzerS.pdf https://doc.rero.ch/record/7958/files/StotzerS.pdf is a PhD thesis for VisualAudio. It says "To get a good audio quality, a resolution of about 1 μm is needed, which would mean 25000 dpi." Yeah, it's going to be a while before phones get there! Also, here's Heine's 1977 laser scanning phonograph paper - https://www.aes.org/e-lib/browse.cfm?elib=3098 https://www.aes.org/e-lib/browse.cfm?elib=3098 . Here's a Saphir paper - https://hal.science/hal-01885324/ https://hal.science/hal-01885324/ . Here's an approach using an off-the-shelf scanner - https://www.aes.org/e-lib/browse.cfm?elib=16071 https://www.aes.org/e-lib/browse.cfm?elib=16071 (the VisualAudio PhD thesis mentions these as having lower quality).