Patent ID: 7238874
Filing Date: 2007-07-03
Classification: G10H,G11B

Abstract:
1. A disc for use in an apparatus having a record player with a turntable and an arm with a pick-up element disposed thereon, a digital filter fed by said pick-up element comprising a circuit for detecting and following a carrier frequency and a demodulation circuit for demodulating a time-code signal that is modulated on the carrier frequency in the audible range between 20 and 20,000 Hz, the disc comprising: a groove which can be followed by said pick-up element of said apparatus, said groove comprises said time-code signal modulated on a carrier frequency in the audible range between 20 Hz and 20,000 Hz wherein said time-code signal is an absolute time-code signal that is comprised in the groove in a predetermined number of subsequently arranged discrete steps and wherein the time-code signal is comprised in both left and right channel of the groove, having a mutual phase shift which provides directionality when said pickup element is lowered onto a rotating disc and wherein said time code signal controls reproduction speed and direction by said digital audio source.