DISC-SHAPED, optically readable RECORD CARRIER AND DATA STORAGE MEDIUM FOR INFORMATION DEVICE FOR THE PRODUCTION OF SUCH A RECORD CARRIER, apparatus for recording DATA INFORMATION IN SUCH A RECORD CARRIER AND DEVICE FOR READING OF SUCH A RECORD CARRIER.

摘要

An optically readable record carrier for storing digitally coded information having a power spectrum with a substantially zero level at a predetermined frequency. The information is recorded on and/or reproduced from substantially parallel elongated tracks on the record carrier which have a periodic undulation at the aforesaid predetermined frequency. Such undulation generates a clock signal for synchronizing the recording and/or reproduction of the digitally encoded information on the tracks, and does not interfere with the recording or reproduction of such information. Apparatus is disclosed for forming such tracks on the record carrier.