Information reproducing apparatus and phase lock control apparatus
First Claim
1. An information reproducing apparatus comprising:
- first means for periodically generating a sample of an information signal in response to a sampling clock signal;
second means for detecting a level relation between successive ones of the information-signal samples generated by the first means;
third means for detecting a peak-corresponding sample among the information-signal samples in response to the level relation detected by the second means and in response to a prescribed level range containing a “
0”
level, wherein a level represented by the peak-corresponding sample detected by the third means is outside the prescribed level range;
fourth means for calculating a level difference between information-signal samples immediately preceding and immediately following the peak-corresponding sample detected by the third means;
fifth means for generating a phase error signal in response to the level difference calculated by the fourth means; and
sixth means for controlling the sampling clock signal in response to the phase error signal to lock the sampling clock signal in phase with the information signal.
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Abstract
A sample of an information signal is periodically generated in response to a sampling clock signal. A level relation between successive ones of the information-signal samples is detected. A peak-corresponding sample is detected among the information-signal samples in response to the detected level relation and in response to a prescribed level range containing a “0” level. A level represented by the detected peak-corresponding sample is outside the prescribed level range. Calculation is made regarding a level difference between information-signal samples immediately preceding and immediately following the detected peak-corresponding sample. A phase error signal is generated in response to the calculated level difference. The sampling clock signal is controlled in response to the phase error signal to lock the sampling clock signal in phase with the information signal.
8 Citations
11 Claims
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1. An information reproducing apparatus comprising:
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first means for periodically generating a sample of an information signal in response to a sampling clock signal;
second means for detecting a level relation between successive ones of the information-signal samples generated by the first means;
third means for detecting a peak-corresponding sample among the information-signal samples in response to the level relation detected by the second means and in response to a prescribed level range containing a “
0”
level, wherein a level represented by the peak-corresponding sample detected by the third means is outside the prescribed level range;
fourth means for calculating a level difference between information-signal samples immediately preceding and immediately following the peak-corresponding sample detected by the third means;
fifth means for generating a phase error signal in response to the level difference calculated by the fourth means; and
sixth means for controlling the sampling clock signal in response to the phase error signal to lock the sampling clock signal in phase with the information signal. - View Dependent Claims (2, 3, 7, 9, 10)
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4. An information reproducing apparatus comprising:
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an analog-to-digital converter for converting an analog signal representative of digital information into a first digital information signal; and
a re-sampling DPLL section for periodically re-sampling the first digital information signal in response to a bit clock signal to convert the first digital information signal into a second digital information signal;
wherein the re-sampling DPLL section comprises;
(1) an interpolator for generating samples of the second digital information signal from samples of the first digital information signal through interpolation responsive to the bit clock signal;
(2) a provisional determination device for detecting a peak-corresponding sample among the samples of the second digital information signal in response to a prescribed level range containing a “
0”
level, wherein a level represented by the detected peak-corresponding sample is outside the prescribed level range;
(3) a calculator for calculating a level difference between samples immediately preceding and immediately following the detected peak-corresponding sample;
(4) means for generating a phase error signal in response to the calculated level difference; and
(5) means for controlling the bit clock signal in response to the generated phase error signal to lock the bit clock signal in phase with the first digital information signal. - View Dependent Claims (5, 6, 8)
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11. A phase lock control apparatus apparatus comprising:
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an analog-to-digital converter for converting an analog signal representative of digital information into a sequence of samples of a digital information signal in response to a sampling clock signal;
a provisional determination device for detecting a peak-corresponding sample among the samples of the digital information signal in response to a prescribed level range containing a “
0”
level, wherein a level represented by the detected peak-corresponding sample is outside the prescribed level range;
a calculator for calculating a level difference between samples immediately preceding and immediately following the peak-corresponding sample detected by the provisional determination device;
first means for generating a phase error signal in response to the level difference calculated by the calculator; and
second means for controlling the sampling clock signal in response to the phase error signal generated by the first means to lock the sampling clock signal in phase with the analog signal.
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Specification