METHOD AND APPARATUS FOR MEASURING SIGNAL QUALITY USING EYE PATTERN

摘要

A SIGNAL QUALITY MEASURING METHOD AND APPARATUS IN WHICH A QUALITY OF A SIGNAL DETECTED FROM AN RF SIGNAL READ OUT FROM A DISK OR A COMMUNICATIONS CHANNEL IS MEASURED BY USING EYE PATTERN SIGNALS OF THE DETECTED RF SIGNALS. EYE PATTERN SIGNALS REPRESENTING TIME CHANGE OF A WAVEFORM OF THE DETECTED SIGNAL ARE GENERATED AND A SIGNAL QUALITY VALUE IS GENERATED BASED ON AN EYE DEPTH AND/OR AN EYE WIDTH MEASURED FROM THE EYE PATTERN SIGNALS. A HISTOGRAM (511) OF THE EYE PATTERN SIGNALS IS USED TO IDENTIFY A PLURALITY OF MAIN LEVEL VALUES WHICH ARE USED AS A REFERENCE VALUE IN MEASURING THE SIGNAL QUALITY. ACCORDINGLY, SIGNAL CHARACTERISTICS IN A HIGH-DENSITY STORAGE MEDIUM SYSTEM OR COMMUNICATION SYSTEM MAY BE ACCURATELY REPRESENTED.