TWO-DIMENSIONAL DEMODULATION METHOD, TWO-DIMENSIONAL DEMODULATION APPARATUS AND HOLOGRAPHIC APPARATUS
First Claim
1. A two-dimensional demodulation method for reproducing a data page, by means of maximum likelihood decoding processing, from a recording medium on which the data page has been recorded as a set of a plurality of two-dimensional modulation pattern symbols, each of which comprises a plurality of pixels, and which have been modulated two-dimensionally,the method comprising:
- a step of determining a value of pixel deviation in a reproduction image obtained by receiving light from the recording medium on an image sensor;
a step of splitting an output signal of the image sensor, which indicates the reproduction image of the light received from the recording medium, into signal symbol data by division into blocks in accordance with the two-dimensional modulation pattern symbols; and
a step of carrying out maximum likelihood decoding for each of the signal symbol data in accordance with the pixel deviation value.
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Accused Products
Abstract
A two-dimensional demodulation method for reproducing a data page by means of decision feedback Viterbi detection processing from a recording medium on which a data page has been recorded as a set of a plurality of two-dimensional modulation pattern symbols each of which comprises a plurality of pixels, and which have been modulated two-dimensionally, the method comprising: a step of determining a value of pixel deviation in a reproduction image obtained by receiving light from the recording medium on an image sensor; a step of splitting an output signal of the image sensor which indicates the reproduction image of the light received from the recording medium into signal symbol data by division into blocks in accordance with the two-dimensional modulation pattern symbols; and a step of carrying out decision feedback Viterbi detection for each signal symbol data in accordance with the pixel deviation value.
17 Citations
19 Claims
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1. A two-dimensional demodulation method for reproducing a data page, by means of maximum likelihood decoding processing, from a recording medium on which the data page has been recorded as a set of a plurality of two-dimensional modulation pattern symbols, each of which comprises a plurality of pixels, and which have been modulated two-dimensionally,
the method comprising: -
a step of determining a value of pixel deviation in a reproduction image obtained by receiving light from the recording medium on an image sensor; a step of splitting an output signal of the image sensor, which indicates the reproduction image of the light received from the recording medium, into signal symbol data by division into blocks in accordance with the two-dimensional modulation pattern symbols; and a step of carrying out maximum likelihood decoding for each of the signal symbol data in accordance with the pixel deviation value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17)
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9. A two-dimensional demodulation apparatus which reproduces a data page by means of maximum likelihood decoding processing from a recording medium on which the data page has been recorded as a set of a plurality of two-dimensional modulation pattern symbols, each of which comprises a plurality of pixels, and which have been modulated two-dimensionally, comprising:
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an image sensor; a component which determines a pixel deviation value for a reproduction image obtained by receiving light from the recording medium on the image sensor; a component which splits an output signal of the image sensor which indicates the reproduction image of the light received from the recording medium into signal symbol data by division into blocks in accordance with the two-dimensional modulation pattern symbols; and a component which carries out maximum likelihood decoding for each of the signal symbol data in accordance with the pixel deviation value. - View Dependent Claims (10, 11, 12, 18)
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13. A holographic apparatus which reproduces a data page by means of maximum likelihood decoding processing from a recording medium on which the data page has been recorded as a set of a plurality of two-dimensional modulation pattern symbols, each of which comprises a plurality of pixels, and which have been modulated two-dimensionally, comprising:
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an image sensor; a component which determines a pixel deviation value for a reproduction image obtained by receiving light from the recording medium on the image sensor; a component which splits an output signal of the image sensor which indicates the reproduction image of the light received from the recording medium into signal symbol data by division into blocks in accordance with the two-dimensional modulation pattern symbols; and a component which carries out a maximum likelihood decoding for each of the signal symbol data in accordance with the pixel deviation value. - View Dependent Claims (14, 15, 16, 19)
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Specification