STORAGE DEVICE AND STORAGE METHOD
First Claim
1. A storage device comprising:
- a selection circuit that selects one mapping rule from a plurality of mapping rules in which each of bit labels having a bit length of (n+1) or more is mapped to n M-ary symbols, when M is defined as an integer of 3 or more and n is defined as an integer of 2 or more;
a first conversion circuit that converts a data block in data into an M-ary symbol sequence using the selected one mapping rule;
a second conversion circuit that converts the converted M-ary symbol sequence into an M-step pulse width signal;
a recording medium that records converted M-step pulse width signal; and
a readback circuit that equalizes the signal read from the recording medium to the M-ary symbol sequence and restores the data.
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Accused Products
Abstract
according to one embodiment, in a storage device, a selection circuit selects one mapping rule from a plurality of mapping rules in which each of bit labels having a bit length of (n+1) or more is mapped to n M-ary symbols, when M is defined as an integer of 3 or more and n is defined as an integer of or more. A first conversion circuit converts a data block in data into an M-ary symbol sequence using the selected one mapping rule. A second conversion circuit converts the converted M-ary symbol sequence into an M-step pulse width signal. The recording medium records the converted M-step pulse width signal. A readback circuit equalizes the signal read from the recording medium to the M-ary symbol sequence and restores the data.
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20 Claims
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1. A storage device comprising:
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a selection circuit that selects one mapping rule from a plurality of mapping rules in which each of bit labels having a bit length of (n+1) or more is mapped to n M-ary symbols, when M is defined as an integer of 3 or more and n is defined as an integer of 2 or more; a first conversion circuit that converts a data block in data into an M-ary symbol sequence using the selected one mapping rule; a second conversion circuit that converts the converted M-ary symbol sequence into an M-step pulse width signal; a recording medium that records converted M-step pulse width signal; and a readback circuit that equalizes the signal read from the recording medium to the M-ary symbol sequence and restores the data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A storage method comprising:
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selecting one mapping rule from a plurality of mapping rules in which each of bit labels having a bit length of (n+1) or more is mapped to n M-ary symbols, when M is defined as an integer of 3 or more and n is defined as an integer of 2 or more; converting a data block in data into an M-ary symbol sequence using the selected one mapping rule; converting the converted M-ary symbol sequence into an M-step pulse width signal; recording the converted M-step pulse width signal on a recording medium; and equalizing the signal read from the recording medium to the M-ary symbol sequence and restoring the data. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification