Data transfer method, block synchronizing signal detecting method, and reproducing apparatus
AssigneeSony Corporation
InventorsAkira Itou, Toshihiko Hirose
Life of this patent
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Abstract
There is provided a method of detecting a block sync signal in which a sync signal and code sequence can be distinguished from each other to recognize the head of a block composed of a plurality of code words at the time of data reading or reception. A sync word detector (10) is supplied with a window signal Sync_window generated based on a parity OK signal supplied from a parity check circuit (12) and indicating a period between the sync word included in signal read from the medium (1) and the ID information, and detects the sync word as to a bit string detected by a PRML Viterbi detector (6) with the use of the Sync_window signal.
Claims17
A data transmission method in which data is transmitted with a block sync signal added to the head of a block composed of a plurality of code words, wherein the block sync signal has more than one succession of 9 same bits when the maximum length of a succession of same bits in a code sequence is Tmax=8.
A data transmission method in which data is transmitted with a block sync signal added to the head of a block composed of a plurality of code words, wherein in a detection trellis having a time-varying structure and used for maximum likelihood detection of a code sequence including the block sync signal from an output sequence of a transmission channel, block sync signals different in start-point state from each other are unique, respectively, and identical in end-point state to each other.
A block sync signal detection method of detecting a block sync signal transmitted as an addition to the head of a block composed of a plurality of code words, wherein:
- in a detection trellis having a time-varying structure and used for maximum likelihood detection of a code sequence including the block sync signal from an output sequence of a transmission channel, block sync signals different in start-point state from each other are unique, respectively, and identical in end-point state to each other;
- and
- the block sync signal detection is done with the use of a window signal having a detection window that is based on a detected sync signal.
A block sync signal detection method of detecting a block sync signal transmitted as an addition to the head of a block composed of a plurality of code words, wherein:
- in a detection trellis having a time-varying structure and used for maximum likelihood detection of a code sequence including the block sync signal from an output sequence of a transmission channel, block sync signals different in start-point state from each other are unique, respectively, and identical in end-point state to each other;
- and
- a block sync signal is detected, the start-point state of the block sync signal in the detection trellis is detected according to the uniqueness of the detected block sync signal and a branch metric is preset after detection of the block sync signal.
A player in which a code sequence including a transmitted sync signal is detected from an output sequence of a transmission channel having a predetermined characteristic, the player comprising:
- a non-time-varying detection means for detecting a code sequence including a block sync signal from an output sequence of a transmission channel;
- a sync signal detection means for detecting a block sync signal from an output from the non-time-varying detection means and outputting the information;
- a Viterbi detection means initialized with a block sync signal information output from the sync signal detection means to make Viterbi detection of a code sequence including a block sync signal from the transmission-channel output sequence with the use of a detection trellis having a time-varying structure;
- and
- a window signal generation means for generating a window signal having a block sync signal detection window that is based on a block sync signal detected by the sync signal detection means and a detection output from the Viterbi detection means;
- the sync signal detection means detecting a block sync signal with the use of the window signal generated by the window signal generation means.
Dependencies are inferred from the claim text.