Patent ID: 9082455
Filing Date: 2015-07-14
Classification: G11B

Abstract:
1. A method for digital partial response asymmetry compensation of a digital data signal, the method comprising: providing pulses of the digital data signal having a pulse length equal to or smaller than a first value to a first signal path and providing pulses of the digital data signal having a pulse length equal to or greater than a second value to a second signal path, the second value being larger than the first value; determining an asymmetry value of the digital data signal by measuring envelopes of the pulses in the first signal path and measuring envelopes of the pulses in the second signal path; determining upper and lower thresholds by evaluating upper and lower envelopes of the pulses in the first signal path and the asymmetry value; and selecting and compensating only asymmetric parts of the digital data signal using the determined upper and lower thresholds.