0
When an AM signal is received, the receiver must perform a converse process to get the original signal ( Information Signal ) back .
This process is known as detection or demodulation, the simplest process which is used widely in AM radios is the Envelop Detector .
Envelop Detector is an electronic circuit which is used to recover ( Demodulate ) the original signal in AM systems, its constructed from just one diode, one capacitor and one resistor .
This is essentially just a halfwave rectifier which charges a capacitor to
a voltage = the peak voltage of the AM signal .
However .. the output of the detector follows the envelop of the modulated signal.
On the positive cycles of the input signal, the diode conducts and the capacitor charges
up to the peak voltage of the input signal.
As the input falls below this peak value, the diode is cut off, because the capacitor
voltage is greater than the input signal voltage, thus causing the diode to open.
The capacitor now discharges through the resistor at slow rate .
The discharge process continues until the nest positive half-cycle. When the input signal
becomes greater than the output across the capacitor, the diode conducts again and the process is repeated .
Wiki User
∙ 16y ago
Wiki User
∙ 12y agoEnvelope detection is done to detect the envelope in am output signal.
Add your answer:
Earn +20 pts
What is meant by Repetition rate of an AM envelope?
Repetition rate of an AM envelope refers to the frequency of the modulating signal thus the shape of the envelope is identical to the shape of the modulating signal.
How are synchros used in error detection?
Control systems are synchros which are used in error detection. They provide a voltage to be converted to torque through an amplifying method.
Longform of RADAR?
Acronym for RAdio Detection And Ranging.
Is the phase shift caused by the post detection filter a lead or lag?
lead
What metal is used in fire detection?
Like the first person said, bismuth.
Advantages and disadvantages of envelope detection compare to synchronous detection?
One of the Advantage of synchronous detection is that it causes less distortion when compared to envelope detection. Also synchronous works well with Single sideband signals.
Advantages and disadvantages of envelope detection amplitude modulation compare to synchronous am detection?
ADVANTAGES OF IDS
Disadvantages of DSB-SC modulation?
-Carrier not available in receiver -Envelope detection not possible
Why do you use envelope detection in an M-ary Frequency Shift Keying noncoherent Modulator?
Envelope detection is used in an M-ary Frequency Shift Keying noncoherent modular because LOs are not required. Moreover, an estimate of 1dB of more power compared to the Frequency Shift Keying coherent demodulation.
What 8 letter word has one letter in it?
The answer is an envelope. It contains a letter.
Can you help with a sentence for the word detection?
detection
What starts with e ends with e and contains only one letter?
The word is "envelope" (which usually holds only one letter).
How does the nuclear envelope allow materials in and out of the envelope?
It does
What part of speech is envelope?
Envelope is a noun.
Used for error detection?
Used for error detection
What is the prepositional phrase in don't forget to put a stamp on the envelope?
on the envelope.
What is the possessive form of envelope?
The possessive form for the noun envelope is envelope's.Example: The envelope's flap wasn't sealed.
