Patent ID: 6775629
Filing Date: 2004-08-10
Classification: G06F,H04L

Abstract:
A method for determining one or more signal parameters for a tone in an input signal, the method comprising:receiving samples of the input signal, wherein the input signal includes the tone; generating a frequency transform of the samples; identifying a frequency location proximate to an amplitude peak in the frequency transform, wherein the amplitude peak corresponds to the tone; selecting two or more frequency bins proximate to the frequency location in the frequency transform; and determining a tone frequency value that minimizes a difference between at least a first expression and a second expression; wherein the first expression comprises a sum of two or more numerator terms divided by a sum of two or more denominator terms, wherein the first expression includes a tone frequency variable; wherein each numerator term and each denominator term corresponds to one of the frequency bins; and wherein the second expression comprises a sum of one or more of the numerator terms divided by a sum of one or more of the denominator terms, wherein the second expression includes the tone frequency variable; wherein the tone frequency value comprises a frequency of the tone.