TNR and PR of Orders

This section describes how to calculate the Tone-to-Noise Ratio and Prominence Ratio for specific orders.

The TNR (or PR) is calculated as a function of time according to the following method:

The signal is split in time frames. Each frame has a length of 32,768 points, and the next frame starts 1638 points later. This ensures a 95% overlap between consecutive frames. For each frame, the TNR (or PR) of an order is calculated and associated to the starting time of the frame. Finally, the TNR (or PR) vs. time is obtained as the sequence of these calculated values vs. the frame times.