Patent ID: 9203449
Filing Date: 2015-12-01
Classification: H04B

Abstract:
1. A delay quantity estimation apparatus comprising: a first correlation value arithmetic unit to calculate a first correlation value as a correlation value between a first input signal and a feedback signal delayed with a first delay value; a second correlation value arithmetic unit to calculate a second correlation value as a correlation value between the first input signal and a feedback signal delayed with a second delay value; and a delay quantity estimation unit to estimate a delay quantity of the feedback signal on the basis of a first difference value as a difference between the first correlation value and the second correlation value, wherein the second delay value is equal to a value given by adding a certain value to the first delay value, the first correlation value arithmetic unit calculates a third correlation value as a correlation value between a second input signal and the feedback signal delayed with a third delay value with respect to the second input signal, the second correlation value arithmetic unit calculates a fourth correlation value as a correlation value between the second input signal delayed with the certain value and the feedback signal delayed with the third delay value, and the delay quantity estimation unit estimates a delay quantity of the feedback signal on the basis of the first difference value and a second difference value as a difference between the third correlation value and the fourth correlation value.