JPS6411423A - Equalization system for loss of subscriber line - Google Patents

Abstract

PURPOSE:To equalize line loss by increasing two negative feedback noninverting amplifiers in gain linearly almost from the frequency where the loss of a subscriber line begins to have primary or secondary inclination to the Nyquist frequency. CONSTITUTION:The gain characteristic of a 1st-stage negative feedback noninverting amplifier 1 increases linearly almost from the frequency where the loss of the subscriber loss begins to have the primary inclination through a circuit 7 and an RF 1 to the Nyquist frequency. The gain characteristic of a 2nd-stage negative feedback noninverting amplifier 2 increases linearly almost frequency where the loss of the subscriber line begins to have the secondary inclination through a circuit 8 and an RF 2 to the Nyquist frequency. A subscriber equalizer has the gain obtained by adding both gains, its characteristic has the primary and secondary inclinations, and the line loss of the subscriber line having the primary inclination and secondary inclination can be equalized.