4 ms·
We kinda did keep going, except we put the grooves onto foil as little dots, and read them with a laser. Also, the whole thing is encased in polycarbonate.
by falcrist 7y ago
We kinda did keep going, except we put the grooves onto foil as little dots, and read them with a laser. Also, the whole thing is encased in polycarbonate.
- pmlnr 7y agoYou need a computer of some sort to decode that, whereas vinyl _is_ engraved vibrations.
- Nursie 7y agoEngraved vibrations that have been transformed with the RIAA curve so that they will fit. It can be played raw, but most of the bass is missing. This is what pre-amps are for.
- ken 7y agoThe frequency-dependent amplification performed by RIAA eq is in fact a simple analog computer!
- swiley 7y agoIt's possible that you could get sound out of a CD with just a shift register and maybe a PLL circut to sync up the boundries of the PCM codes, and a way to skip over the error correction data (which would be harder to make dedicated hardware for but probably not impossible.) The audio data on CDs is still just uncompressed PCM which really doesn't need a computer.
- core-questions 7y agoStands to reason it wouldn't have been impossible to make an analogue medium using similar technologies. Imagine the refraction angle varying continuously and some wide-range pickup that converts to electricity. _why_, of course, is a different question
- stormbrew 7y agoLaserdisc was an analog implementation of that technology. Eventually it also carried digital audio a la CD but the video and the original audio encoding were analog.
- core-questions 7y agoAre you sure that's not this RCA CED thing they're talking about?
- cr0sh 7y agoI'll second it - LaserDisc was an analog medium - not digital. CED was analog also, but used a "stylus" to pick up capacitance changes from the "groove" depth. There's plenty of information out there on both processes; very interesting to see, you should check it out...