Viterbi decoder method and apparatus with RI detector in...

Details Viterbi decoder method and apparatus with RI detector in... Viterbi decoder method and apparatus with RI detector in...

2008-01-17

2011-11-01

Trimmings, John (Department: 2117)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S700000, C714S746000, C714S751000, C714S752000, C714S792000, C714S796000, C360S078040, C360S077020, C360S029000, C360S025000, C360S026000

Reexamination Certificate

active

08051365

ABSTRACT:
Apparatus and methods are disclosed for decoding data stored on a data storage medium. A disclosed decoding method and decoder include a radial incoherence (RI) detector that increases the probability of detecting RI and improves the decoding performance in terms of the bit error rate of the decoded signal. RI is detected by comparing an input signal to the decoder against a RI threshold value and generating a RI-type signal. The RI detector may include a filter for filtering out noise and error in the RI-type signal, an adaptive threshold unit that adjusts the RI threshold value based upon the RI-type signal, a transition-based threshold unit that adjusts the RI threshold value based upon each transition in the input signal, or a path-based threshold unit that adjusts the RI threshold value based upon a best surviving path corresponding to the input signal, in combination or alone.

REFERENCES:
patent: 7082005 (2006-07-01), Annampedu et al.
patent: 7349167 (2008-03-01), Erden et al.
patent: 7362536 (2008-04-01), Liu et al.
patent: 2003/0099052 (2003-05-01), Annampedu et al.
patent: 2005/0264922 (2005-12-01), Erden et al.

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