Patent ID: 6826350
Filing Date: 2004-11-30
Classification: G06K,H04H,H04N

Abstract:
A high-speed signal search method characterized in providing:a first step that generates a feature quantity sequence for a pre-recorded reference signal; a second step that sets the input signal window for the input signal that has been input; a third step that generates a feature quantity sequence for the input signal of this input signal window; a fourth step that calculates the input signal similarity value showing the degree of similarity between the feature quantity sequence generated in the first step and the feature quantity sequence generated in the third step; a fifth step that calculates the skip width showing the amount that the input signal window can be moved based on the input signal similarity value calculated in the fourth step; and a sixth step that determines the position of the input signal window based on the skip width calculated in the fifth step, sets the input signal window to this position; and further: calculates the input signal similarity value for each position of the input signal window by repeating the third step to the sixth step; and determines whether or not the reference signal exists at the position that the input signal window presently shows in the input signal based on the result of comparing the input signal similarity value and the predetermined threshold value.