ALERTING PROCESS

Abstract

An alerting process is presented that uses the steps of first receiving at least a first signal from a signal source for a predetermined short interval. The first signal is analyzed over the predetermined short interval to obtain the spectral energy of the first signal within contiguous incremental frequency bands that extend over the frequency spectrum of interest. The energy value obtained for each incremental frequency band is then stored as a short term integrated value in a memory at an address location corresponding to the incremental frequency. Successive short term integrated values are then integrated over a predetermined long term interval to obtain a long term integrated value for each respective incremental frequency band. Each short term integrated value is then divided by the corresponding long term integrated value to obtain an enhanced STI frequency value for each incremental frequency band. The frequency of each enhanced STI frequency value exceeding a predetermined threshold is then stored in a memory system. A present track frequency value is calculated as the centroid of adjacent stored STI frequency values. Present track frequency values are correlated with past track frequency values to form and extend frequency tracks. The variance value for each present track frequency value is calculated for a predetermined number of past frequency values corresponding to the same frequency track. An alert signal is provided in response to a variance value exceeding a predetermined threshold.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1WILLIAM A. WILSON