What is synchronous AM mode?
Using synchronous AM (sometimes referred to as AM-Sync, Sync AM, S-AM or AM-S), the original carrier is mixed with a very stable carrier generated by a circuit known as a synchronous detector. As this signal is very stable, it is not subject to distortion because of fading.
What is synchronous or coherent detection?
Here, the same carrier signal (which is used for generating DSBSC signal) is used to detect the message signal. Hence, this process of detection is called as coherent or synchronous detection.
Why the synchronous detection of AM signals is considered as a disadvantage?
Why the Synchronous detection of AM signals is considered as a disadvantage? Explanation: Disadvantage of synchronous detection of AM signal are that it needs an additional system for generation of carrier. It also needs additional system for synchronization of carrier. Moreover receiver is complex and costly.
What is the main difference between synchronous detection and envelope detection?
Envelope detector doesn’t require a carrier signal to extract the message signal as it only draw an outline upon the modulated Carrier Signal only by using a diode and capacitor. Hence it’s not a Synchronous detection.
What is synchronous detection for SSB SC?
Here, the same carrier signal (which is used for generating SSBSC wave) is used to detect the message signal. Hence, this process of detection is called as coherent or synchronous detection.
What are the methods for detecting AM waves?
Envelope detector is used to detect (demodulate) high level AM wave. Following is the block diagram of the envelope detector. This envelope detector consists of a diode and low pass filter. Here, the diode is the main detecting element.
Is coherent and synchronous same?
If two synchronous signals have the same static phase they will be coherent.
What is coherent detection?
Coherent detection allows information to be encoded with two degrees of freedom, which increases the amount of information per channel. From: Optical Fiber Telecommunications VII, 2020.
Can we apply synchronous detection method for demodulation of AM signal?
The simplest form of detection for an amplitude modulated signal utilises a simple diode rectifier. To achieve improved performance a form of demodulation known as synchronous demodulation can be used.
Which of the following is an advantage of using synchronous detectors?
Whatever method of synchronous detection is used, it provides some significant advantages over a diode envelope detector in terms of reduced distortion, increased immunity to selective fading, and low signal performance.
What are the methods for SSB SC detection?
Coherent Detector In this process, the message signal can be extracted from SSBSC wave by multiplying it with a carrier, having the same frequency and the phase of the carrier used in SSBSC modulation. The resulting signal is then passed through a Low Pass Filter.
What is coherent and noncoherent detection?
In coherent detection the local carrier generated at the receiver is phase locked with. the carrier at the transmitter. Hence it is also called synchronous detection. In non coherent detection the local carrier generated at the receiver not be phase. Locked with the carrier at the transmitter.
What is correlation detector?
Through a correlation detector, the collection of such contribution over the entire test signal leads to high expected correlation values when correlating with the fingerprints from the true colluders, and to low expected correlation values when correlating with the fingerprints from innocent users.
What is synchronous detection method?
Synchronous detection is a measurement method where a stimulus is modulated with some frequency and the response is demodulated to bring the signal back down to base band.
What is synchronous detection for SSB-SC?
Why is it called synchronous detector?
In electronics, a synchronous detector is a device that recovers information from a modulated signal by mixing the signal with a replica of the un-modulated carrier. This can be locally generated at the receiver using a phase-locked loop or other techniques.
What is phase difference and path difference?
The phase difference is the difference in the phase angle of the two waves. Path difference is the difference in the path traversed by the two waves. The relation between phase difference and path difference is direct. They are directly proportional to each other.