| 摘要 |
The present invention relates to a magnetically recorded data reproduction apparatus which reproduces magnetically recorded data using a magnetoresistive head and method thereof. In this invention the recorded data are reproduced by a magnetoresistive head 2 and supplied to a reproduction amplifier 4. The signal from the reproduction amplifier 4 is then supplied to a high-pass filter 5 and a frequency component of, for example, 1 MHz or lower, is cut off. The signal from the HPF 5 is supplied to an integrating equalizer 6, a phase equalizer 7 and an analog cosine equalizer 8. The signal from the equalizer 8 is supplied to an AGC amplifier 10 through a low-frequency component correction circuit 9. The signal from the AGC amplifier 10 is supplied to an A/D converter 11. Further, the signal from the AGC amplifier 10 is supplied to the digital PLL circuit 12 and the extracted clock signal is supplied to the A/D converter 11. The digitized signal is then supplied to, for example, a Viterbi decoder 13 and the decoded signal is obtained at an output terminal 14. Thus, the effect of noise due to the so-called thermal asperity (TA noise) is removed, thereby preventing increases in the error rate of the reproduction signals due to the effect of TA noise and the occurrence of problems in equipment. |
