| 摘要 |
PURPOSE:To realize a board type equalizer which is easily controlled and suitable for integration, by connecting a variable gain circuit to an amplifying circuit with frequency characteristics to be equalized. CONSTITUTION:The difference signal obtained by subtracting the output signal of an amplifier 3 with transmission characteristics Q from an input signal Si is inputted to an amplifying circuit 2 with transmission characteristics Q and an amplifying circuit 1 with transmission characteristics P, and the outputs of those circuits 1 and 2 are added by a synthesizing circuit 5 to obtain an output signal So. The transmission characteristics P are regarded as frequency characteristics to be equalized, and the transmission characteristics Q are as variable gain charateristics. Adding the frequency characteristics and variable gain characteristics to the overall characteristics T by the transmission characteristics P and Q realized characteristics of a board type. Even when the transmission characteristics P and Q are exchanged with each other, the characteristics of the board type are realized. |
