In a hard disk drive, a semiconductor chip includes a circuit used in a built-in self test (“BIST”) to determine an amplitude of a dibit echo for characterizing nonlinear distortion of a readback signal. Preferably, write precompensation is performed based on results of the BIST to minimiz...
Measuring Vision and Vision Loss August Colenbrander PART 1. INTRODUCTION: ASPECTS OF VISION LOSS In epidemiology, as in individual health care, it is important to know both the cause and nature of a condition, and also the severity of its impact and of