I am simulating a feature detector in noisy environment which consist of AWGN Noise and Impulsive Noise. But I am getting a strange result as Signal with Impulsive+AWGN noise has better detection probability then with Signal with only AWGN. I know its wrong at some point. How Is it possible that signal with more noise like Impulsive noise has better detection possibility. Please share your experience.
Our ears have a hearing threshold- i.e. a minimum amount of sound power that is required for them to detect. Thus, a pure tone that is less than the threshold will not be detected. If white noise is added to the tone such that the total power of the tone and noise exceeds the threshold, then the ear can hear the tone.
Perhaps you have some sort of similar non-linear effect going on.