The video and audio signals were stored on the Videodiscs using pits in the bottom of the groove; the stylus rode over these pits, but they affected the capacitance between the stylus and the conductive carbon-loaded PVC disc.
The video and audio signals were stored on the Videodiscs via peaks and valleys in the grooves, similar to a phonograph record, of both sides of the discs. The varying undulations of the peaks and valleys in the groove provided differing amounts of capacitance between the stylus and the conductive carbon-loaded PVC disc.