Date: Jan 5, 2013 3:46 PM
Subject: ETFE and Frequency Data - Resolution of Frequency
I am using the ETFE function to look at the frequency response of my data. I am using 2048 points and the sampling rate is 100Hz (1/100sec). My code looks like this:
ETFE_DATA = etfe(data, 100, 2048);
I noticed the Frequency has a resolution of of 50/2048 (or 0.0244Hz). Shouldn't the resolution be twice that, 50/2048 0.0488Hz?
Similar in the help for FFT, to create your frequency vector you would use:
(100/2)*linspace(0,1,2048/2+1)%you will see the frequency increments are 0.0488Hz.