Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1996-05-23
1999-07-06
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
369 60, 369 48, 360 51, 331 17, G11B 2014
Patent
active
059205334
ABSTRACT:
The invention provides a clock signal extraction circuit which can extract a synchronizing clock signal accurately from a readout waveform reproduced from information recorded in a high density and which includes substantial intersymbol interferences. An analog readout signal is converted into binary information with a synchronizing clock signal from a voltage controlled oscillator. A replica signal is produced from the binary information by a waveform replica production circuit while time corrected readout waveform data are produced from the analog readout signal by a delay circuit, and a phase amount is detected from the time corrected readout waveform data and the replica signal by a phase amount detection circuit. The base amount is used to control the voltage controlled oscillator, thereby forming a phase locked loop to perform a follow-up operation to the readout signal.
REFERENCES:
patent: 4736238 (1988-04-01), Moriyama et al.
patent: 4945538 (1990-07-01), Patel
patent: 5363352 (1994-11-01), Tobita et al.
patent: 5432820 (1995-07-01), Sugawara et al.
Faber Alan
NEC Corporation
Psitos Aristotelis M.
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