JP2000057701A5 - - Google Patents

Claims (5)

A digital information reproducing apparatus that performs management of recording media in a unit of n (n is an integer of 1 or more) recording and reproduces the recording medium in which a specific pattern is recorded in the head area of each recording unit. , a / D converting means for converting the reproduced signal from the pre-type recording medium to the quantized data, a phase comparison means for detecting a phase error information from the output quantized data from the previous SL a / D converter converting means The frequency detection means 1 for detecting frequency error information from the quantized data output from the A / D converter conversion means at a specific timing obtained from the counter, the phase error information, and the frequency error information from the sampling clock comprising a timing signal extracting means to generate said timing signal extracting means, in the first part of the recording unit using the frequency error, in a region other than the head, the Digital information reproducing apparatus characterized by control the phase of the sampling clock using a phase error. A digital information reproducing apparatus that performs management of recording media in a unit of n (n is an integer of 1 or more) recording and reproduces the recording medium in which a specific pattern is recorded in the head area of each recording unit. The frequency detection means 2 for detecting the frequency error information 2 from the tracking error signal from the recording medium, and when the frequency of the timing signal and the clock frequency included in the reproduction signal of the recording medium differ by a predetermined frequency or more, A controller that switches between the detected frequency error information and the frequency error information 2 so as to control the frequency of the timing signal from the frequency error information 2; and the timing signal extraction unit is configured to reproduce digital information from the RF signal. Uses the frequency error information in the head area of the recording unit, and the phase error in areas other than the head. To control the phase of the sampling clock, and when the frequency of the timing signal differs from the clock frequency included in the reproduction signal of the recording medium by a predetermined frequency or more, the frequency of the timing signal is determined from the frequency error information 2 digital information reproducing apparatus according to claim 1, wherein the control the. The timing signal extraction means includes a low-pass filter 1 that smoothes the phase error information, a low-pass filter 2 that smoothes at least one of the frequency error information 1 and the frequency error information 2, and an output of the low-pass filter 1 as an analog signal. A D / A converter 1 for converting the signal into a signal, and a D / A converter 2 for converting the output of the low-pass filter 2 into an analog signal, and an addition signal of the D / A converter 1 and the D / A converter 2 is an oscillator 2. The digital information reproducing apparatus according to claim 1, wherein the frequency is controlled. 2. The digital information according to claim 1, wherein the timing signal extraction means starts the operation of the counter and outputs frequency error information at the moment when the reproduction signal reaches a preset threshold value. Playback device. The frequency detection means 1 determines that the RF signal and the timing signal are based on the fact that the period of the single signal included in the specific pattern of the head area of the recording unit is n times the period of the clock included in the RF signal. The digital information reproducing apparatus according to claim 1, wherein frequency error information is detected.