What are the characteristics of amplitude modulation?
amplitude modulation (AM), variation of the amplitude of a carrier wave (commonly a radio wave) in accordance with the characteristics of a signal, such as a vocal or musical sound composed of audio-frequency waves.
What are the advantages of amplitude modulation?
Advantages and Disadvantages of Amplitude Modulation Demodulation can be done using few components and a circuit. It requires a very high bandwidth that is equivalent to that of the highest audio frequency. The receiver used for AM is very cheap. Noise interference is highly noticeable.
What is amplitude modulation explain the block diagram of a practical AM transmitter?
Amplitude Modulated (AM) transmitter. Fig gives the block diagram of amplitude modulated radio transmitter. It consists of two sections (i) Audio frequency (AF) section and (ii) Radio frequency (RF) section. AF section. The AF section of the transmitter generates the modulating wave (signal).
What is major disadvantage of amplitude modulation?
Disadvantages: It requires more than twice the amplitude frequency to modulate the signal with a carrier. Amplitude modulation systems are susceptible to noise generation. This deteriorates the quality of the original signal at the receiving end and causes problems in the quality of the signal.
What is the role of transmitter in communication system Mcq?
What is the role of the transmitter in the communication system? Explanation: Transmitter is used to produce radio waves which are then sent to the antennae to transmitted. It encodes or modulates the message signal before transmission. Transducer converts a signal from one form of energy to other.
What is amplitude modulation explain the block?
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to that of the message signal being transmitted.
How is amplitude modulation used in a radio signal?
Fig 1: An audio signal (top) may be carried by a carrier signal using AM or FM methods. Amplitude modulation ( AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave.
How is the modulation index of an AM transmitter displayed?
Modulation index is normally expressed as a percentage, and may be displayed on a meter connected to an AM transmitter. So if , carrier amplitude varies by 50% above (and below) its unmodulated level, as is shown in the first waveform, below. For , it varies by 100% as shown in the illustration below it.
How is the modulation factor related to the carrier wave?
As amplitude modulation is simple it is widely used. The ratio of change of amplitude of the carrier wave to the amplitude of the normal carrier wave is called the modulation factor. It describes the depth of modulation i.e. the extent in the variation of the amplitude of carrier wave due to the signal.
What’s the difference between AM and DSB amplitude modulation?
Each sideband is equal in bandwidth to that of the modulating signal, and is a mirror image of the other. Standard AM is thus sometimes called “double-sideband amplitude modulation” (DSB-AM) to distinguish it from more sophisticated modulation methods also based on AM.