Analogue and digital signals, Basic Computer Science

Analogue and digital signals:

Analogue (continuous) information is made available in virtually all aircraft equipment.  Figure 1 shows the analogue signal created by a variable resistor.  In the circuit +0V is present at the output "A" when the potentiometer is at position 1 and +5V when at position 2.  These values would represent either a 1 (+5V) or a 0 (+0V).  However, it can be seen from the graph of the analogue signal that it does produce distinct values of +5V and +0V as the potentiometer moves from one end to the other.

1958_ANALOGUE AND DIGITAL SIGNALS.png

Analogue Signal Representation

A digital signal is one that contains two distinct values (1 and 0).  Figure 2 shows a digital signal being produced by use of a switch.  With the switch in the open position, +0V will be present at point (logic 0).  When the switch closes, +5V will be present at point (logic 1).  Digital signals are often considered to be either "ON" or "OFF" (logic 1 or 0).

1184_ANALOGUE AND DIGITAL SIGNALS1.png

 

Signals in analogue form can be processed using operational amplifiers and other devices in various configurations and ultimately converted to an observable output by a suitable output device. 

Systems, which are completely analogue, are limited in the accuracy that can be achieved both physically and economically, they also suffer from error and distortion for various reasons such as non-linearity, drift, crosstalk, noise etc.  Digital systems, especially since the advent of integrated circuits, offer improvements over analogue systems in most respects, thus modern processing systems employ fixed analogue and digital circuitry (hybrid systems) in which, of course, conversion from one form to the other must take place at certain points within the system. 

Hybrid systems are more common than all digital systems presumably because of the simplicity of analogue transducers, and the nature of the information to be processed lends itself more readily to analogue representation.  For example it would be difficult to digitize an audio signal without converting it from changing air pressure to an electrical analogue by means of a microphone (transducer). 

 

Posted Date: 9/13/2012 8:06:49 AM | Location : United States







Related Discussions:- Analogue and digital signals, Assignment Help, Ask Question on Analogue and digital signals, Get Answer, Expert's Help, Analogue and digital signals Discussions

Write discussion on Analogue and digital signals
Your posts are moderated
Related Questions
The three main elements of the control unit are: 1. Decoder this is used to decode the instructions that create a program when they are being processed, and to establish in what ac


Problem - programming language: A Problem is to carry out a particular task. For solving the problem, some input has to be given to the system. The system will process or mani

Explain how ICT can be used for achievement of each of the following business objectives, illustrating your answer with examples: 1. Customer intimacy 2. Low-cost leadership

Question 1 Describe HSV and CMYK color models Question 2 Describe gamma and its importance Question 3 What are the steps involved in image manipulation? Que

prove that the build heap operation is O(N)


I need to create mulitple queues assignment that run concurrently. It is like a queue simulation with  number of checkouts with a random probability of clients, joining any one


Ask queswhat is the advanages of eeprom?