METHOD AND A DEVICE FOR ESTIMATING A TIME DELAY BASED ON A CROSS-CORRELATIVE OPERATION, WHICH ARE GENERATED BY A SINGLE SIGNAL SOURCE AND ESTIMATES A DELAY TIME OF SIGNALS INPUTTED TO A PLURALITY OF MICROPHONE OR ANTENNAS

摘要

PURPOSE: A method and a device for estimating a time delay based on a cross-correlative operation are provided to prevent errors of estimating the time delay even though a maximum value of a cross-correlation function is arranged between a sampling time and the next sampling time.;CONSTITUTION: A device (100) for estimating a time delay includes an input unit (110), a digital converting unit (115), a cross-correlation operator (120), and a time delay estimating unit (130). The input unit receives a plurality of signals from the outside and generates first and second signals. The digital converting unit digitalizes the first and second signals, thereby generating first and second digital signals. The cross-correlation operator generates third digital signals that the second digital signals are delayed as much as a predetermined period, generates a first cross-correlation function by mutually cross-correlation operating, and generates a second cross-correlation function by mutually cross-correlation operating the first and third digital signals.;COPYRIGHT KIPO 2013;[Reference numerals] (110) Input unit; (115) Digital converting unit; (120) Cross-correlation operator; (122,AA) Fourier converter; (123) Natural signal generating unit; (124,BB) Cross-correlation calculator; (125,CC) Inverse Fourier transformer; (130) Time delay estimating unit; (131,EE) Integer part estimating unit; (132,DD) Fraction part estimating unit; (133) Comparator; (134) Delay estimator