Patent ID: 6995932

Claim:
A detection circuit for detecting data in a read data signal generated by a head of a perpendicular recording system, the read data signal including at least one of data and transients, a transient detect signal indicative of one of the transients, the detection circuit comprising: a first path comprising a filter and a first data detector responsive to the filter; the filter to generate a filtered data signal in which low frequency components of the read data signal are attenuated; the first data detector, operable for detecting data in the filtered data signal, to generate a first detected data signal; a second path including a second data detector, operable for detecting data in the read data signal, to generate a second detected data signal; and a switch, controllable in response to the transient detect signal, to select either the first detected data signal when the transient detect signal indicates a transient is detected or the second detected data signal to a data processor when the transient detect signal does not indicate a transient is detected.