Patent ID: 6094316
Filing Date: 2000-07-25
Classification: G11B

Abstract:
A circuit for processing a read signal in a storage device, comprising:a sampling circuit to receive a read signal generated by a transducer in response to proximate contact between the transducer and magnetic flux fields recorded upon a magnetic media surface;said sampling circuit, to convert the read signal into a sample stream;a sample filter coupled to the sampling circuit that differentiates and filters a level shift in the sample stream due to a thermal asperity located on the magnetic media surface to provide a filtered sample stream in which the level shift is removed;a multiplexor coupled to said sampling circuit and said sample filter; anda fixed delay tree search detector coupled to said multiplexor, said detector having a first set of filter parameters that are selected for use during normal operation, and a second set of filter parameters that are selected for use during said contact;wherein said multiplexor provides the output of the sampling circuit directly to said detector during normal operation and provides the output of the sampling circuit to said detector via said sample filter during said contact.