DATA REPRODUCER

• Main Authors: ITOU SHIGEYUKI, WATAYA YOSHIZUMI
• Format: Patent
• Language: English
• Published: 10.07.1984
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

PURPOSE:To ensure automatic compensation for the deviation of a strobe point and to reduce greatly the reproduction data error factor, by using the input/ output signal and the clock of a strobe circuit to obtain the deviation information of the strobe point and controlling automatically a clock phase shifting circuit with the integration value of the deviation information. CONSTITUTION:The reproduction clocks given from PLL circuits 7-9 are automatically controlled by a clock phase shifting circuit 10 so that the rise point is equal to the best identification point. The phase deviation is obtained in the form of an output (r) of an Ex-OR16 which uses the input signal (e) and the output signal (k) of a strobe circuit 11 as an input, respectively. The detection signal (s) of a circuit consisting of a strobe circuit 15, an inverter 17 and an Ex- NOR18 is multiplied by the clock through an AND circuit 19. An OR circuit 20 adds an inserted clock (t) to the waveform (r), and the phase deviation data (u) is integrated by an integration circuit 21 to obtain a clock phase shift controlling signal having less variance. For the clock delivered from the PLL circuit, the strobe point deviation is compensated by a phase shift controlling signal.