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Abstract

A method and apparatus for minimizing the effects of non-stationary high-energy noise sources in magnetic data storage channel through the use of an oversampling and post-sampling filtering anti-aliasing procedure. The initial analog data is sampled at a rate sufficiently above the Nyquist rate to avoid aliasing. The high-frequency sampling stream is then digitally filtered to produce a lower-rate digital data stream having a reduced Nyquist rate introduced by the post-sampling digital filter. Because the anti-aliasing post-sampling filter is digital, no phase distortion is introduced in the readback data signal. Because the post-sampling digital filter lowers the Nyquist rate, late digital processing and decoding is accomplished without aliasing at a data rate below the initial Nyquist rate. High-energy noise pulses are preserved without smearing and can be simply removed by the usual error-correction method.

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