X-Stream Operator’s Manual
WM-OM-E Rev I 15
Notes on Using Channel Emulation without Reference........................................................ 374
Channel Emulation with Reference ........................................................................... 375
Notes on Using Channel Emulation with Reference............................................................. 377
Using Analog Compare.............................................................................................. 378
Notes on Using Head/Analog Compare................................................................................ 379
Local Feature Concepts............................................................................................. 380
Overview ............................................................................................................................... 380
Peak-Trough Identification.................................................................................................... 381
Local Baselines..................................................................................................................... 381
Setting Hysteresis ................................................................................................................. 383
Local Parameters.................................................................................................................. 383
Local Feature Parameters ......................................................................................... 385
Disk Standard Parameters......................................................................................... 400
Disk PRML Parameters ............................................................................................. 408
Noise Parameters...................................................................................................... 417
PRML Channel Emulation ......................................................................................... 420
Why PRML?.......................................................................................................................... 420
Principle of Equalization........................................................................................................ 421
-3 dB Frequency ................................................................................................................... 422
Boost at fc ............................................................................................................................. 422
Group Delay.......................................................................................................................... 423
Resampling ADC .................................................................................................................. 424
Finite Impulse Response (FIR) ............................................................................................. 424
Phase Locked Loop (PLL) .................................................................................................... 424
Automatic Gain Control (AGC) ............................................................................................. 425
PLL and AGC........................................................................................................................ 426
ML Detector .......................................................................................................................... 426
Viterbi Detector & Trellis ....................................................................................................... 426
SAM ...................................................................................................................................... 426
Encoding ............................................................................................................................... 427
Error Correction .................................................................................................................... 427
User Defined Trellis ................................................................................................... 427
File Format and Language (version 1).................................................................................. 427
Loading Your UDT File Remotely ......................................................................................... 428
Example File ......................................................................................................................... 434
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