Judgment level setting method and data receiver
First Claim
1. (Amended) An evaluation level setting method to be employed in a data reception apparatus which receives a signal in which one or more bits of data is assigned as one data symbol to a signal level, comprising:
- receiving an initialization pattern signal which is outputted from a data transmission apparatus, at turn-on of power or immediately after reset;
establishing clock synchronization on the basis of the initialization pattern signal, and setting evaluation levels with which signal levels are subjected to threshold evaluation;
calculating ideal values of the respective signal levels on the basis of the evaluation levels which are set according to the initialization pattern signal, and holding the ideal values; and
adjusting the gain of a received signal on the basis of a difference between the signal level of the received signal and an ideal value of the signal level, thereby to correct variations in the received signal.
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Accused Products
Abstract
It is an object to provide an evaluation level setting method for accurately evaluating signal levels, and a data reception apparatus, in multi-valued transmission for transmitting data while assigning one or more bits of data as one data symbol to a signal level.
A data transmission apparatus outputs an initialization pattern signal at turn-on of power or after reset, and a data reception apparatus establishes clock synchronization on the basis of the received initialization pattern signal, and starts data reception after setting of evaluation levels to be used for threshold evaluation of signal levels.
29 Citations
9 Claims
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1. (Amended) An evaluation level setting method to be employed in a data reception apparatus which receives a signal in which one or more bits of data is assigned as one data symbol to a signal level, comprising:
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receiving an initialization pattern signal which is outputted from a data transmission apparatus, at turn-on of power or immediately after reset;
establishing clock synchronization on the basis of the initialization pattern signal, and setting evaluation levels with which signal levels are subjected to threshold evaluation;
calculating ideal values of the respective signal levels on the basis of the evaluation levels which are set according to the initialization pattern signal, and holding the ideal values; and
adjusting the gain of a received signal on the basis of a difference between the signal level of the received signal and an ideal value of the signal level, thereby to correct variations in the received signal. - View Dependent Claims (2, 3)
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4. (Deleted)
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5. (Amended) A data reception apparatus for receiving a signal in which one or more bits of data is assigned as one data symbol to a signal level, comprising:
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a synchronization detection unit for performing clock reproduction on the basis of received signal levels, thereby to detect establishment of synchronization;
an evaluation level holding unit for calculating evaluation levels with which the respective signal levels are subjected to threshold evaluation, and holding the evaluation levels;
a data symbol value holding unit for calculating ideal values of the respective signal levels on the basis of the set evaluation levels, holding the ideal values, and calculating a difference between the signal level of a received signal and an ideal value of the signal level;
a loop filter for storing the difference between the signal level of the received signal and the ideal value of the signal level; and
a multiplier for adjusting the gain of the received signal on the basis of the output from the loop filter, thereby to correct variations in the received signal. - View Dependent Claims (6, 7, 8)
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9. (Deleted)
Specification