| 摘要 |
PROBLEM TO BE SOLVED: To improve the performance of a line interface circuit in a communication network. SOLUTION: A method for reinforcing stability related to an individual line interface circuit 20 includes a step for measuring a phase angle between a battery voltage and an output voltage. The measurement of the phase angle is processed by a digital signal processor 213 for composing a comparator circuit 231 in order to generate the output voltage in the case where the phase angle is not 45 deg.. A new output voltage is given to the line interface circuit and re-calculated to decide whether or not this phase angle is closer to 45 deg.. In an alternative execution form, a data base 227 including plural output voltages and electric parameter values is stored in the digital signal processor and instructed by the measured phase angle between the battery voltage and the output voltage. |
