CELLULAR MOBILE COMMUNICATION
In late 1991, U.S. Digital Cellular (USDC, IS-54) was introduced. to replace AMPS analog channels 3 times of capacity due to the use of digital modulation ( DQPSK), speech coding, and TDMA technologies. could further increase up to 6 times of capacity given the advancements of DSP and speech coding technologies.
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UNIT-I
www.bharathuniv.ac.inLinear Time Invariant Systems A system satisfying both the linearity and the time-invariance property. LTI systems are mathematically easy to analyze and characterize, and consequently, easy to design. Highly useful signal processing algorithms have been developed utilizing this class of systems over the last several decades.
UNIT-I - OVERVIEW OF EMBEDDED SYSTEMS Embedded System
www.bharathuniv.ac.inDisadvantages High development effort Larger time to market Basic Structure of an Embedded System The following illustration shows the basic structure of an embedded system − Sensor − It measures the physical quantity and converts it to an electrical signal which can be read by an observer or by any electronic instrument like an A2D converter.
INTRODUCTION TO POWER QUALITY
www.bharathuniv.ac.inVoltage fluctuations are relatively small (less than 5 percent) variations in the r.m.s ... making the distortion level on the low-voltage supply network a serious concern. As time goes ... the electric system which can cause problems if the sum of the harmonic currents exceeds certain
UNIT 1 OVER VOLTAGE IN ELECTRICAL POWER SYSTEM …
www.bharathuniv.ac.in2. Indirect lightning strokeS LIGHTNING ,SWITCHING AND TEMPORARY OVER VOLTAGE over-voltage-spike Over voltages are caused on power systems due to external and internal influencing factors. The voltage stress caused by over voltage can damage the lines and equipment’s connected to the system.
UNIT-I INTRODUCTION
www.bharathuniv.ac.inapplication using LabVIEW and an M Series DAQ board on a desktop computer PCI bus in his lab to create a DC voltage and temperature measurement application. After completing the system, he needs to deploy the application to a PXI system on the manufacturing floor to perform the test on new product.
UNIT I - INTRODUCTION OF RELAYS
www.bharathuniv.ac.inθ is the angle by which S 2 lands S 1.If β 1 = β 2 =90 o, the comparator is called cosine comparator and if β 1 =0 and β 2 =180 o, it is a sine comparator. In short, a phase comparator compares two input quantities in phase angle (vertically) irrespective of the magnitude and operates if the phase angle between them is < 90o. There are two types of phase comparators:
BEE501- CONTROL SYSTEM UNIT 1 SYSTEMS AND THEIR …
www.bharathuniv.ac.insystem are compared with mesh equations of the electrical system. Rotational mechanical system is shown in the following figure. The torque balanced equation is (Equation 4) By comparing Equation 4 and Equation 3, we will get the analogous quantities of rotational mechanical system and electrical system. The following table shows these ...
UNIT-I Automobile electrical and electronics Electrical ...
www.bharathuniv.ac.inenough voltage so that it can easily create a spark for burning air/fuel mixture and secondly it exercises control over the timing of spark and transmit it to the apt cylinder. A typical automobile ignition system produces voltage somewhere between 20000 volts and 50000 volts from a 12-volt source. Automobile ignition
Digital image processing - Bharath Institute of Higher ...
www.bharathuniv.ac.inComponents of an Image Processing System 5. Mass Storage Capability Mass storage capability is a must in a image processing applications. And image of sized 1024 * 1024 pixels requires one megabyte of storage space if the image is not compressed. Digital storage for image processing applications falls into three principal categories: 1.
OVERVIEW OF POWER SYSTEM CONTROL - Bharath Institute …
www.bharathuniv.ac.in4. Inter connected areas can be tolerate larger load changes with smaller frequency deviations 5. Central control centre monitors information about frequency, generating unit outputs and tie line power flows to interconnected areas. 6. This information is used by automation load frequency control in order to maintain area
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