Patent ID: 7295394

Claim:
A method of equalizing and demodulating an information signal recorded in a magnetic recording medium by a partial response signal processing system, the method comprising: equalizing and demodulating said information signal if an isolated reversion producing waveform reproduced from said magnetic recording medium indicates an asymmetry γ>0, wherein γ(%)=[[(PW 1 )−(PW 2 )]/PW 50 ]×100; wherein PW 50 is a full width at half maximum of the isolated reversion producing waveform, PW 1 is a width between a peak amplitude of the isolated reversion producing waveform and a point on a right-hand side of the peak amplitude at which the isolated reversion producing waveform has a value equal to half of the peak amplitude, PW 2 is a width between the peak amplitude of the isolated reversion producing waveform and a point on a left-hand side of the peak amplitude at which the isolated reversion producing waveform has a value equal to half of the peak amplitude, and PW 50 is equal to a sum of PW 1 and PW 2 ; wherein if coefficient terms of the partial response are 1, a 1 , a 2 , . . . , a 2n , 1 +  ∑ k = 1 n - 1 ⁢ a k  <  ∑ k = n + 1 2 ⁢ n ⁢ a k  ; wherein if coefficient terms of the partial response are 1, a 1 , a 2 , . . . , a 2n+1 , 1 +  ∑ k = 1 n ⁢ a k  <  ∑ k = n + 1 2 ⁢ n + 1 ⁢ a k  ; ⁢ and wherein n is an integer not less than 1.