3 ms·
Does anyone understand what it does to play different recordings on the same physical surface? Are they interlocking spirals and it has slightly different start
by kamranjon 3y ago
Does anyone understand what it does to play different recordings on the same physical surface? Are they interlocking spirals and it has slightly different starting point? Curious what's allowing it to use the same space for different recordings without swapping out mini records between plays.
- stronglikedan 3y agoLinked by another poster below: https://jalopnik.com/1982-datsun-voice-warning-box-used-tiny-phonograph-reco-5246380 https://jalopnik.com/1982-datsun-voice-warning-box-used-tiny...
- phire 3y agoYeah, 6 interleaved spirals, allowing it to select a track by timing when it drops the stylus. There are 6 electrical contacts spaced around the disc that close at the correct timing for each track. This is described in the patent (pdf) https://patentimages.storage.googleapis.com/74/b1/1c/cb2bf1218f26f8/US4426691.pdf https://patentimages.storage.googleapis.com/74/b1/1c/cb2bf12...