Name: - BHAVESH PATWAL
Tutor : - JAY PATEL
Date: - 20th November, 2012
I . Analogue Signals : -
Analogue signal is a form of transmitting data such as voice, image or video using continuous signals. This is a relatively inexpensive way to transmit data. Analogue communications are usually sent via twisted cables or fibre optic cables and they are transmitted via a carrier signal which is set at a specific frequency.
The primary disadvantage of analogue signalling is that any system has noise – i.e., random unwanted variation. As the signal is copied and re-copied, or transmitted over long distances, these apparently random variations become dominant Living examples: What we speak is analog signal.
II. Digital Signals : -
Digital Signals are much more common and desirable method of transmitting data. Digital information is put into a synchronized order to enable transmission. The information is then decoded when it reaches its final destination. There are not many opportunities for errors when using this method so information arrives intact and in the best quality possible. One more aspect about digital signals they are binary digits that is they are represented using bits (Binary digits) Until recently, most telephone, radio and television signals were sent via analogue communication devices and are still used in circumstances where information is sent just a short distance due to the inexpensive nature of Analogue technology. In situations where analogue was primarily the method of transmitting data, digital is now taking over. This is because analogue is often open to interference and the communication is not always as clear as it should be. Many countries have now stopped using analogue TV completely as the picture and sound quality is far superior on digital TV. III. Relative merits: -
A. Basic differences
Analogue signals are continuous signals and Digital are discrete signals Generally...