Method and apparatus for spectral cross coherence

A machine implemented method for spectral analysis in computing hardware comprising:

• using an adaptive filter having a first weight, scanning data to generate a first power-frequency spectrum with a first resolution;
• using a conventional filter having a second weight, scanning the same data to generate a second power-frequency spectrum with a second resolution;
• and
• cross-correlating the first power-frequency spectrum of the adaptive filter and the second power-frequency spectrum of the conventional filter to determine a measure of cross coherence, the measure of cross coherence identifying a spectral feature of the data, wherein the measure of cross coherence is a power-frequency spectrum with a higher resolution than the first resolution of the first power-frequency spectrum or the second resolution of the second power-frequency spectrum, the measure of cross coherence adapted to resolve at least two closely spaced features at the higher resolution.

A machine implemented method for spectral analysis in computing hardware comprising:

• in a processor:
• filtering data with an adaptive filter to determine a first power spectrum estimate representing a region of interest, the first power spectrum estimate having a first resolution;
• filtering the same data with a conventional filter to determine a second power spectrum estimate, the second power spectrum estimate having a second resolution;
• determining a measure of cross coherence between application of the adaptive filter and the conventional filter to the same data based on the determined region of interest by cross-correlating the first-power frequency spectrum of the adaptive spectral estimation filter with the second power-frequency spectrum of the conventional spectral estimation filter, wherein the measure of cross coherence is a power-frequency spectrum with a higher resolution than the first resolution of the first power-frequency spectrum or the second resolution of the second power-frequency spectrum, the measure of cross coherence adapted to resolve at least two closely spaced features at the higher resolution;
• and
• identifying a spectral feature of the measure of cross coherence.