Patent ID: 8126668

Claim:
A method of signal detection, comprising the steps of: (a) dividing a received input signal into a frame unit using a computer; (b) transforming an input signal present in a first frame into a first frequency signal and an input signal present in a second frame into a second frequency signal using a computer; (c) computing first power spectrum information and second power spectrum information utilizing the transformed first and second frequency signals, respectively using a computer; (d) obtaining a delta spectrum entropy value corresponding to a difference of the computed first and second power spectrum information using a computer; and (e) judging if a predetermined input signal is included in a predetermined frame among at least one of the first and second input signals through comparing the delta spectrum entropy value with a critical value using a computer; wherein the first frame and the second frame are selected according to a time sequence among the divided frame, and steps (b) to (e) are repeatedly implemented for every selected first frame and second frame; wherein the step (d) includes: (d-1) computing delta spectrum information which is a difference between the first power spectrum information and the second power spectrum information; (d-2) normalizing the computed delta spectrum information; and (d-3) obtaining the delta spectrum entropy value from the normalized delta spectrum information; and wherein the computed delta spectrum information at the step (d-2) is normalized by the following equation, P ⁡ [ S ′ ⁡ ( i , n ) ] =  S ′ ⁡ ( i , n )  ∑ m = 1 M / 2 ⁢  S ′ ⁡ ( m . n )  in which P[S′(i,n)] represents normalized delta spectrum information corresponding to i th frequency component of n th frame, S′(i,n) represents delta spectrum information corresponding to i th frequency component of n th frame, S′(m,n) represents delta spectrum information corresponding to m th sample of n th frame, and M represents the number of samples included in one frame.