Computer Comm Network

A network is simply defined as something that connects things together for
a specific purpose. The term network is used in a variety of contexts,
including telephone, television, computer, or even people networks.
A computer network connects two or more devices together to share a
nearly limitless range of information and services, including:
• Documents
• Email and messaging
• Websites
• Databases

Signal & System

Signal & system are two words relate dwith each other.Signal have their own meanning same as system.
Here signal is defined as a detectable physical quantity or impulse (as a voltage, current, or magnetic field strength) by which messages or information can be transmitted.
Signal is Classified in two category:-
1.Discrete-time Signal : Discrete-time Signal

Digital Signal Processing

 Digital signal processing (DSP) is the mathematical manipulation of an information signal to modify or improve it by some way. It is characterized by the representation of discrete time, discrete frequency, or other discrete domain signals by a sequence of numbers or symbols and the processing of these signals.DSP is usually to measure, filter and/or compress continuous real-world analog signals.In this firstly analog signal are converted into digital signal by sampling and then digitizing it using an analog-to-digital converter (ADC).

Digital Electronics

Digital electronics or digital (electronic) circuits is related with digital signals.digital signal are those whose represented by discrete interval of times rather then continous time of intervals.

E&l instruments 325-1455 digital electronics board 5

In most cases the number of these states is two, and they are represented by two voltage bands: one near a reference value (typically termed as "ground" or zero volts), and the other a value near the supply voltage. These correspond to the "false" ("0") and "true" ("1") values of the Boolean domain i.e.binary code.
In a digital system, a more precise representation of a signal can be obtained by using more binary digits to represent it While this requires more digital circuits to process the

VHSIC Hardware Description Language (VHDL)

VHDL (VHSIC Hardware Description Language) is a hardware description language used in electronic design automation to describe digital and mixed-signal systems such as field-programmable gate arrays and integrated circuits.

Analyzing the design and then Elaborate it

The IEEE Standard 1076 defines the VHSIC Hardware Description Language or VHDL. It was originally developed under contract F33615-83-C-1003 from the United States .Air Force awarded in 1983 to a team with Intermetrics Inc. as language experts and prime contractor, with Texas Instruments as chip design experts and IBM as computer system design experts. The development of logic synthesis tools that read the VHDL, and output a definition of the physical implementation of the circuit.
VHDL was originally developed at the behest of the U.S Department of Defense in order to document the behavior of the ASICs that supplier companies were including in equipment.

Control System

Open Loop & Closed Loop Control System

A control system is a device, or set of devices, that manages, commands, directs or regulates the behavior of other devices or systems. Industrial control systems are used in industrial production for controlling equipment or machines.
There are two common classes of control systems:-
1. open loop control systems :-  In open loop control systems output is generated based on inputs.

2. closed loop control systems:-  In closed loop control systems current output is taken into. consideration and corrections are made based on feedback. A closed loop system is also called a feedback control system. The human body

Digital Communication

What is digital communication ?

Digital communication systems, by definition, are communication systems that use such a digital
sequence as an interface between the source and the channel input (and similarly between the
channel output and final destination).

The idea of converting an analog source output to a binary sequence was quite revolutionary
in 1948, and the notion that this should be done before channel processing was even more
revolutionary.