NOISE REDUCTION DEVICE

摘要

A noise elimination device according to the present invention includes a signal separation unit that divides input frequency information generated from an input signal on a time-domain into suppression target band information including a cyclic noise as the main component and intended sound band information including intended sound band information as the main component, a first frequency reverse-conversion unit that converts the suppression target band information into time-domain information and thereby outputs a suppression target signal, a second frequency reverse-conversion unit that converts the intended sound band information into time-domain information and thereby outputs an intended sound signal, and a cyclic noise information storage unit that accumulates the suppression target signal and thereby stores noise history information including information corresponding to at least one cycle of the cyclic noise.

主权项

1. A noise elimination device comprising:
a frequency conversion unit configured to convert an input signal in a form of time-domain information into frequency-domain information and thereby outputs input frequency information; a signal separation unit configured to divide the input frequency information into suppression target band information and intended sound band information, where a main component of the suppression target band information a frequency band information of a cyclic noise mixed in the input signal, and a main component of the intended sound band information is information other than the frequency band of the cyclic noise; a first frequency reverse-conversion unit configured to convert the suppression target band information into time-domain information and thereby outputs a suppression target signal; a second frequency reverse-conversion unit configured to convert the intended sound band information into time-domain information and thereby outputs an intended sound signal; a cyclic noise information storage unit configured to accumulate the suppression target signal and thereby stores noise history information including at least one cycle period of the cyclic noise; a noise filter that artificially reproduces the suppression target signal by using the noise history information as a reference signal, and generates a suppression signal having a reversed relation to the suppression target signal and outputs a difference value between the suppression signal and the suppression target signal as a residual signal; and an adder that combines the residual signal with the intended sound signal and thereby generates an output signal.