Howtosignalprocessing
- What does an envelope detector do in the frequency domain?
- How do you implement an envelope detector?
- What is envelope frequency?
What does an envelope detector do in the frequency domain?
An envelope detector can be used to demodulate a previously modulated signal by removing all high frequency components of the signal. The capacitor and resistor form a low-pass filter to filter out the carrier frequency.
How do you implement an envelope detector?
Method 1: Squaring and Lowpass Filtering
This envelope detection method involves squaring the input signal and sending this signal through a lowpass filter. Squaring the signal effectively demodulates the input by using itself as its own carrier wave.
What is envelope frequency?
In beating waves
Likewise the beat frequency is that of the envelope, twice that of the modulating wave, or 2Δf. If this wave is a sound wave, the ear hears the frequency associated with f and the amplitude of this sound varies with the beat frequency.
