Envelope detector for non-zero mean signal (Matlab)

1. How do you calculate envelope of signal in Matlab?
2. How do you find the envelope of a signal?
3. How to use SNR in Matlab?
4. Which filter is used for the envelope detection?

How do you calculate envelope of signal in Matlab?

The envelopes are determined using a sliding window of length wl samples. [ yupper,ylower ] = envelope( x , np ,'peak') returns the upper and lower peak envelopes of x . The envelopes are determined using spline interpolation over local maxima separated by at least np samples.

How do you find the envelope of a signal?

In the EMD algorithm, the upper and lower envelopes of signals are obtained by using two steps: 1) identify all the local extrema; 2) interpolate between extrema by a cubic spline [9]. The interpolative envelope includes the upper and lower envelopes.

How to use SNR in Matlab?

r = snr( xi , y ) returns the signal-to-noise ratio (SNR) in decibels of a signal, xi , by computing the ratio of its summed squared magnitude to that of the noise y : r = mag2db ( rssq ( xi (:))/ rssq ( y (:))) .

Which filter is used for the envelope detection?

This envelope detection method involves squaring the input signal and sending this signal through a lowpass filter.