Patent ID: 6404976
Filing Date: 2002-06-11
Classification: G11B

Abstract:
A VISS signal detection circuit detecting a VISS signal recorded on a magnetic recording medium, comprising:a plurality of first comparators having threshold values differing from each other, each first comparator comparing a level of said VISS signal with its threshold value to supply an output signal when the level of said VISS signal is higher than that threshold value; a plurality of second comparators having threshold values differing from each other, each second comparator comparing a level of said VISS signal with its threshold value to supply an output signal when the level of said VISS signal is lower than that threshold value; a select circuit selecting an output signal from the first comparator having the second highest threshold value out of the first comparators supplying an output signal at a prior comparison, and an output signal from the second comparator having the second lowest threshold value out of the second comparators supplying an output signal at a prior comparison; and an output circuit providing a detection signal driven to a first level in response to one output signal from said select circuit, and driven to a second level in response to the other output signal from said select circuit.