Threshold setting apparatus for adjustably setting a threshold for use in identifying serial data from a baseband signal

Apparatus for identifying and reproducing serial data carried on a baseband signal with respect to a threshold, comprising:

• a waveform distortion estimating circuit for estimating, based on the baseband signal, a relation between a center of a dynamic range of the baseband signal and a crossing point at which a positive-going edge curve crosses a negative-going edge curve of an eye pattern formed by the baseband signal to produce estimated information;
• a reproducing circuit for identifying the serial data with respect to a relative relation in DC level between the baseband signal and the threshold to reproduce the identified serial data;
• and
• a setting circuit for adjustably setting the threshold in dependence upon the estimated information to said reproducing circuit.

Apparatus for identifying and reproducing serial data carried on a baseband signal with respect to a threshold, comprising:

• a waveform distortion estimating circuit for estimating, based on the baseband signal, a relation between a center of a dynamic range of the baseband signal and a crossing point at which a positive-going edge curve crosses a negative-going edge curve of an eye pattern formed by the baseband signal to produce estimated information;
• a reproducing circuit for identifying the serial data with respect to a relative relation in DC level between the baseband signal and the threshold to reproduce the identified serial data;
• and
• a setting circuit for adjustably setting a DC level of the baseband signal in dependence upon the estimated information to said reproducing circuit.