Parallel Filter Detection With Pulse-Width Discriminator
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
The present detection circuit is used in a magnetic recording application. It features two separate filter paths with different filter functions in each path. Also, the filter in each path is followed by a pulse-width discriminator which takes advantage of the individual characteristics of each filter to enable accurate detection of signals containing large amounts of third harmonic distortion. Analog data from a magnetic recording head is amplified by preamplifier 10 and possibly has some filtering of the signal by filter 11. At this point, the analog data stream is divided into two paths which separately process the analog signal in parallel. The first path through filter 12, comparator 13, pulser 14, and delay 15 is the same as would exist in a normal detection design.