Patent ID: 6351540
Filing Date: 2002-02-26
Classification: G10H

Abstract:
A digital echo adding circuit, comprising:a distortion adding circuit to digitally add distortion components to an input signal, the distortion adding circuit having an inverting circuit to receive and invert in polarity the input signal, a distortion component generating circuit to raise the input signal to an n-th power to a generate an n-times frequency component that is n-times that of the input signal, n being an integer, a level-converting circuit to convert a level of the input signal according to a predetermined level conversion characteristic function, a first adder to add output signals of the inverting circuit, the distortion component generating circuit, and the level-converting circuit, and output an added signal, and a second adder to add the input signal and the added signal of the first adder, to create an output signal of the distortion adding circuit; a digital delay circuit to delay the delayed signal of the distortion adding circuit by a predetermined time and digitally output a delayed signal; and an equalizer circuit to receive the output signal of the digital delay circuit, to provide the delayed signal with a predetermined frequency characteristic, and output a resultant signal to the distortion adding circuit to form a feedback circuit.