Computer Science Education

Definition - What does Modulation mean? Modulation is a process through which audio, video, image or text information is added to an electrical or optical carrier signal to be transmitted over a telecommunication or electronic medium. Modulation enables the transfer of information on an electrical signal to a receiving device that demodulates the signal to extract the blended information. Modulation is the process of changing the parameters of the carrier signal, in accordance with the instantaneous values of the modulating signal Types of modulation Analog Modulation: Analog modulation is the simplest form of the modulation. In analog modulation, the modulation is applied continuously in response to the analog information signal. a) Amplitude modulation: Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a high frequency car...

Q.1 What is Multiplexing? Multiplexing refers to the ability to transmit data coming from several pairs of equipment (transmitters and receivers) called low-speed channels on a single physical medium (called the high-speed channel ). Whereas, a multiplexer is the multiplexing device that combines the signals from the different transmitters and sends them over the high-speed channel . A demultiplexer is the device which separates signal received from a high-speed channel into different signal and sends them to receivers. There are four basic multiplexing techniques: Frequency Division Multiplexing (FDM) Time division Multiplexing (TDM) Code division Multiplexing (CDM) Space-division Multiplexing (SDM) FDM (Frequency division multiplexing) (FDM) is the technique used to divide the available bandwidth into a number of smaller independent logical channels with each channel having a small bandwidth. The method of using a number of carrier frequencies each of which is ...

Q.1 What is Data Transmission? Sol: Data transmission  refers to the process of transferring data between two or more digital devices. Data is transmitted from one device to another in analog or digital format. Basically, data transmission enables devices or components within devices to speak to each other. Q.2 How does data transmission work between digital devices? Data is transferred in the form of bits between two or more digital devices. There are two methods used to transmit data between digital devices: serial transmission and parallel transmission. Serial data transmission sends data bits one after another over a single channel. Parallel data transmission sends multiple data bits at the same time over multiple channels. Types of Data Transmission Q.3 What is serial Transmission ? Sol: When data is sent or received using  serial data transmission , the data bits are organized in a specific order, since they can only be sent one after anot...