Envelope extraction

1. What is an envelope of a signal?
2. How does envelope detector work?
3. What is envelope distortion?
4. How do you find the envelope of a signal?

What is an envelope of a signal?

As an imaginary curve, the envelopes of a signal are the boundary within which the signal is contained. Envelopes contain some information of signals, though it is an imaginary curve, for example, demodulating amplitude modulated (AM) signals by them.

How does envelope detector work?

An envelope detector (sometimes called a peak detector) is an electronic circuit that takes a (relatively) high-frequency amplitude modulated signal as input and provides an output, which is the demodulated envelope of the original signal.

What is envelope distortion?

Warping or distorting a design to fit a particular shape is a tool commonly used in Illustrator to create the illusion of motion or fluidity. The effect is achieved with a tool called envelope distort, which basically requires merging one object—either text or a shape—to fit into the shape of something else.

How do you find the envelope of a signal?

The envelope of a signal x(t) should be: abs(hilbert(x(t))) in MATLAB. > analytical signal a(t)=x(t)+j(hilbert(x(t)) of a real value signal, > then the envelope of the original signal is abs(a(t)).