New Concept of Using Coherence Function in Digital Signal Analysis

Quick progress in development of digital computational techniques has also been reflected in signal analysis. However, faster and more accurate arithmetic calculations are far from being a cure-all for all the problems conditioned by physical properties of phenomena. Limitations resulting from nature of the Fourier transformant or other features of non-linear relationships do not disappear. Therefore, it seems crucial that new interpretations methods are applied in order to bypass these limitations. On the other hand, many forms of description used to be of quite restricted use because of limited computing power, and the situation has changed only recently. According to the Authors, high capacity of digital analysis opens new possibilities of applying the coherence analysis. The paper considers an idea of using the coherence function for two tasks: identification of non-linear analytic model and improvement of accuracy narrow-band analysis.