DATA MODE CONVERGING METHOD

摘要

PURPOSE:To reduce converging time by increasing the tap coefficient update gain when the interval of a signal point to be received substantially is a long region in response to a signal voltage after demodulation and decreasing the gain when shorter. CONSTITUTION:A signal power identification decision section 10 detects the signal power at a point A as the square of a radius (r) so as to identify to which of regions 101-103 the power resides and the result is given to a tap coefficient update gain control section 11 and a weighting control section 14 to the update by the tap position. The control section 11 decides to which degree of weighting is to be applied to the coefficient update gain at the conventional converging state corresponding to the regions 101-103 to adjust the variable tap coefficient gain 13. A control section 14 uses a revision weight section 6i to apply weighting to the update according to the signal of the regions 101-103. The difference between the update and the output of a register 4i storing the preceding tap coefficient is calculated by a subtractor 5i to decide a new tap coefficient.