tell about the basic principles of digital techniques

Remote AC Power Control by Android Application with LCD Display.

XBEE Based Remote Monitoring of 3 Parameters on Transformer / Generator Health with Voice Announcement and Wireless PC Interface.

XBEE Based Remote Monitoring of 3 Parameters on Transformer / Generator Health.

Wireless Message Communication between Two Computers.

Device Control and Authentication using RFID.

Touch Screen Based Home Automation System.

RF based Unique Office Communication System.

Speed Synchronization of Multiple Motors in Industries.War Field Spying Robot with Night Vision Wireless Camera.Pick N Place Robot With Soft Catching Gripper.Automatic Bus Location Announcement System using Microcontroller and GPS.RF Controlled Robotic Vehicle With Laser Beam Arrangement.GSM Based Energy Meter Reading With Load Control Using PIC Microcontroller.Theft Intimation of Vehicle Over SMS to Owner.RFID Technology Based Device Control and Authentication system using PIC Microcontroller.GSM Based Wireless Electronic Notice Board.GSM Based Energy Meter Reading with Load Control.Automatic Dialing to any Telephone Using I2C Protocol on Detecting Burglary.Display of Dialed Telephone Numbers on Seven Segment Displays.

Zigbee Technology Based Industrial Automation.Cell Phone Based DTMF Controlled Garage Door Opening System.Similarly, the phase shift keying changes the phase of the carrier for each symbol and it is less sensitive to noise. It needs larger bandwidths as shown in the figure. In frequency shift keying, the frequency of the carrier wave is varied for each symbol in the digital data. It is sensitive to noise and used for low-band requirements. In an Amplitude shift keying, the amplitude of the carrier wave changes based on the message signal or on the base-band signal, which is in digital format. The most important digital modulation techniques are based on keying such asĪmplitude Shift Keying, Frequency Shift Keying, Phase Shift Keying, Differential Phase Shift Keying, Quadrature Phase Shift Keying, Minimum Shift Keying, Gaussian Minimum Shift Keying, Orthogonal Frequency Division Multiplexing, etc., as shown in the figure. Similar to the analog, in this system, the type of the digital modulation is decided by the variation of the carrier wave parameters like amplitude, phase and frequency. The carrier wave is switched on and off to create pulses such that the signal is modulated. This type of modulation is used for signal generation in al synthesizers, such as the Yamaha DX7 to implement FM synthesis. It is an essential part of many digital transmission coding schemes that underlie a wide range of technologies like GSM, WiFi, and satellite television. Generally, phase modulation is used for transmitting waves. So, for this reason, this modulation is also comes under the frequency modulation. When the phase of the signal is changed, then it affects the frequency. In this type of modulation, the phase of the carrier signal varies in accordance with the message signal. Please refer to this link to know more about Frequency Modulation MCQs Phase Modulation When noise occurs naturally in radio systems, frequency modulation with sufficient bandwidth provides an advantage in cancelling the noise. This type of modulation is commonly used for broadcasting music and speech, magnetic tape recording systems, two way radio systems and video transmission systems. Frequency modulation is used in different applications like radar, radio and telemetry, seismic prospecting and monitoring newborns for seizures via EEG, etc. In this type of modulation, the frequency of the carrier signal varies in accordance with the message signal, and other parameters like amplitude and phase remain constant.

Tell about the basic principles of digital techniques