Fixed rate constrained channel code generating and recovery method and means having spectral nulls for pilot signal insertion
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United States of America Patent
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Jan 28, 1986
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N/A
app pub date -
Jan 28, 1983
filing date -
Jan 28, 1983
priority date (Note) -
Expired
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Abstract
The generation of NRZ representations of RLL encoded datastreams utilizes a length oriented arithmetically recursive RLL encoder whose finite state encoding transition space has assigned RLL symbols to state transitions. By constraining the paths, and hence restricting the set of allowable RLL symbol streams, then selectable notch frequencies in the spectra of the NRZ representation can be secured. Recovery of data is obtained by the logical dual of this process. Also, a NRZ bit stream representation exhibits a frequency spectrum notched at f/kn Hertz if k NRZ source codestreams are k-way interleaved.
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