Digital receiver and optical communication system that uses same
First Claim
1. A digital receiver, comprising:
- an analog-to-digital conversion portion setting discrimination levels in accordance with a discrimination level control signal, converting an analog input signal into a digital signal based on the set discrimination levels, and outputting the digital signal;
a discrimination level adjusting portion generating the discrimination level control signal and outputting the discrimination level control signal to the analog-to-digital conversion portion;
a transfer function information portion for generating information about a transfer function of the analog-to-digital conversion portion which is dependent on the discrimination levels; and
a transfer function correcting portion performing signal processing on the digital signal so as to cancel a gap between the transfer function of the analog-to-digital conversion portion and an initial transfer function, which is set in advance, based on the information about the transfer function.
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Accused Products
Abstract
A digital receiver includes: an analog-to-digital (AD) converter (102) for setting discrimination levels in accordance with a discrimination level control signal and converting an analog input signal into a digital signal based on the set discrimination levels; a discrimination level adjusting circuit (104) for generating the discrimination level control signal and outputting the discrimination level control signal to the AD converter; a signal quality monitoring portion (108) for generating a transfer function correction control signal, which is information about a transfer function of the AD converter; and a transfer function correcting circuit (106) for performing signal processing on the digital signal so as to cancel a gap between the transfer function of the AD converter and an initial transfer function based on the transfer function correction control signal.
22 Citations
11 Claims
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1. A digital receiver, comprising:
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an analog-to-digital conversion portion setting discrimination levels in accordance with a discrimination level control signal, converting an analog input signal into a digital signal based on the set discrimination levels, and outputting the digital signal; a discrimination level adjusting portion generating the discrimination level control signal and outputting the discrimination level control signal to the analog-to-digital conversion portion; a transfer function information portion for generating information about a transfer function of the analog-to-digital conversion portion which is dependent on the discrimination levels; and a transfer function correcting portion performing signal processing on the digital signal so as to cancel a gap between the transfer function of the analog-to-digital conversion portion and an initial transfer function, which is set in advance, based on the information about the transfer function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification