公开(公告)号：US06498692B1

公开(公告)日：2002-12-24

申请号：US09653746

申请日：2000-09-01

申请人： Martin Aureliano Hassner ,  Francesco Rezzi ,  Barry Marshall Trager

发明人： Martin Aureliano Hassner ,  Francesco Rezzi ,  Barry Marshall Trager

IPC分类号： G11B502

CPC分类号： G11B20/10046 ,  G11B5/02 ,  G11B5/035 ,  G11B5/09 ,  G11B20/10009 ,  G11B2005/0016

摘要： A circuit combines a read signal from an MR/GMR read head with a signal generated by a matched filter, the parameters of which depend on the geometry of the head and the output of which, generated every Nth clock period, includes a real part and an imaginary part that models an expected head response. The combined signal is phase equalized and sent to a complex correlator, which integrates the signal over N clock periods to output a correlated signal having real and imaginary portions of the Nth root of unity which correspond to bits in an N-clock data unit. The real and imaginary portions can subsequently be digitized and analyzed for errors.

摘要翻译： 电路将来自MR / GMR读取头的读取信号与由匹配滤波器产生的信号相结合，其匹配滤波器的参数取决于头部的几何形状，并且其每第N个时钟周期产生的输出包括实际部分， 模拟预期头部响应的虚构部分。 组合信号被相位相等并发送到复相关器，该复相关器对N个时钟周期内的信号进行积分，以输出具有与第N个时钟数据单元中的位相对应的第N个单位根的实部和虚部的相关信号。 实部和虚部可以随后被数字化并分析出错误。