Digital envelope detector

1. What does an envelope detector do?
2. What is envelope detection in ultrasound?
3. Is envelope detector and diode detector same?
4. What is an ideal envelope detector?

What does an envelope detector do?

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.

What is envelope detection in ultrasound?

In medical ultrasound (US) imaging, the envelope detection is a commonly used digital signal processing (DSP) technique to extract the magnitude of the oscillating broadband radio-frequency (RF) signals from the high-frequency echo carrier before any back-end processing (Chang et al., 2007).

Is envelope detector and diode detector same?

Envelope Detector

Here, the diode is the main detecting element. Hence, the envelope detector is also called as the diode detector.

What is an ideal envelope detector?

The ideal envelope detector is a circuit which takes the absolute value of its input, and then passes the result through a lowpass filter. The output from this lowpass filter is the required envelope signal.