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OPTICALLY READABLE RECORDING CARRIER, DEVICE FOR PRODUCING SUCH A RECORDING CARRIER, AND DEVICE FOR RECORDING AND / OR REPRODUCTION OF DATA INFORMATION IN OR IF NECESSARY OF SUCH A RECORDING CARRIER
OPTICALLY READABLE RECORDING CARRIER, DEVICE FOR PRODUCING SUCH A RECORDING CARRIER, AND DEVICE FOR RECORDING AND / OR REPRODUCTION OF DATA INFORMATION IN OR IF NECESSARY OF SUCH A RECORDING CARRIER
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机译:光学可读的记录载体,用于生产这种记录载体的设备以及用于在必要时记录和/或再现数据信息的设备
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摘要
Disclosed is a record carrier for storage of digital data which is provided with a first periodic track variation having a period corresponding to a frequency at which the power spectrum of the digital signals is at a zero level. The first track variation produces a corresponding modulation of the radiation when scanned by a beam so that a clock signal can be derived from the detected radiation for synchronizing readout or recording of the data. The record carrier is further provided with a second periodic track variation in a direction transverse to the track direction having a period of the same order of magnitude, and preferably equal to the period of the first periodic track modulation. The second track variation produces a corresponding modulation of the beam which is detected and is used to generate to a tracking signal, the clock signal being used as phase reference signal for demodulation of the tracking signal. If the periods of the two track variations are equal, low-pass filtering automatically yields the tracking signal.
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