Friday, January 2, 2015

Differences between Analog and Digital Signals

There are two types of signals that can carry information - analog and digital signals. They have been widely applied in people’s daily life. However, there are still some differences between them. First of all, the primary difference between analog and digital signals is that analog signals are continuous electrical signals which play recorded materials in their original form, whereas digital signals are non-continuous electrical signals generated by digital modulation which play materials in their re-sample forms. At the same time, this leads to the quality difference in analog and digital signals. Nonetheless, analog signals are limited to a larger degree because they are only capable of playing what has been recorded in the first place.

Digital signals take the original recording and turn it into the sample of numbers at certain intervals instead of using the original recordings. Afterwards, the number will be stored onto the digital device and then turned into a voltage wave, which enables people to produce more sophisticated recordings. Therefore, the majority of people would agree that digital signals are of much higher quality although they still prefer the more authentic and rough sound of a record being played.

Analog signals are also different from digital signals in terms of the quality loss over time. The quality of signals will be damaged a little each time video tapes and other analog devices are made use of to play these signals. On the other hand, the quality of signals won’t be damaged at all no matter how many times they are going to be played by digital music and video devices. The signal can always remain the same as the original one as long as the number can be read. This is a rather compelling advantage digital signals have over analog signals.