Seagate Technology Incorporated

Nersi Nazari

Chandra Chuda Varanasi

A method is provided for encoding and decoding binary data, using a non-quasicatastrophic and phase invariant matched spectral null code for a partial response channel. The method is particularly suited for partial response systems wherein the order of the higher order null in the transfer function of the partial response channel is .gtoreq.1, resulting in signal-to-noise (SNR) gain at the channel output. In a preferred form, the method is used to develop a rate 3/10 Nyquist-null trellis code.

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Scotts Valley, CA, United States of America

Nersi Nazari