Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1992-10-28
1994-03-08
Hajec, Donald
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
307354, 328150, 364723, 360 46, G11B 509, H04N 576, G06F 738, K03D 122, H03K 5153
Patent
active
052933695
ABSTRACT:
A variable sampling-rate digital channel phase detector for reading synchronous data recordings from magnetic or optical media. All-digital implementation allows multiplexing of several parallel channels on a single monolithic chip for tape storage systems or other magnetic or optical data storage systems. The ASDD channel signal processing is entirely digital and includes A/D converter, digital filter and equalizer, digital differentiator and zero-crossing detector, peak amplitude estimator, zero-crossing qualifier and zero-crossing position (phase) estimator. The ASDD input is an analog waveform and the output includes two flags for qualified negative and positive waveform threshold-crossings and a digital signal encoding a waveform threshold-crossing position within the current sampling clock interval. The ASDD operates over a wide continuous range of channel data rates and provides accurate phase detection at relatively low sampling rates. It is suitable for monolithic CMOS implementation, which provides low power dissipation and small size.
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Ronald K. Jurgen, "Good-bye to TV Ghosts", IEEE Spectrum, Jul. 1992, pp. 50-52.
Melas Constantin M.
Sutardja Pantas
Hajec Donald
International Business Machines - Corporation
Wamsley Patrick
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