Transfer function compatibility for information for information storage reproduction
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United States of America Patent
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Jan 29, 2002
Grant Date -
N/A
app pub date -
Jan 27, 2000
filing date -
Nov 16, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus are provided for enabling a reproducing apparatus, having a read channel which utilizes a second transfer function, to recover accurately data which has been recorded on a medium with a first transfer function. A compatibility circuit (73) derives a data rate from the medium, and causes the read channel to sample the data steam acquired from the medium at a multiple of the data rate, thereby creating a multiply-sampled data stream. Further, the compatibility circuit manipulates the multiply-sampled data stream to generate a deformatted read data stream. In particular, a deformatter (62) of the compatibility circuit selects only some bits of the multiply-sampled data stream to generate a modified data stream; and the applies a reverse of the first transfer function to generate a deformatted read data stream.
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