Analogue sound and recordingPresentation Transcript
THE ANALOGUE SIGNAL An analogue signal is a continuous signal, it has small fluctuations in it’s signal which are important, unlike digital. An analogue signal is a kind of signal that is continuously variable, as opposed to having a limited number of steps along its range – Digital. A good example of this is an analogue clock - The analogue clock has no physical limit to how finely it can display the time, as its "hands" move in a smooth, pause less fashion. Analogue signals are relatively easy to create and carry from place to place. However, they suffer from the fact that every tiny detail of the pattern matters. If the pattern is slightly altered by unwanted noise or distortion, the output will not be identical to the input. This is why good analogue hi-fi equipment is so hard to make and expensive. Handy explanation
ANALOGUE RECORDING In Greek, ana is "according to" and logos is "relationship") Examples of analogue recordings are Compact Cassette tape recorders and vinyls. It can be argued that analogue is still better than digital in some way; Unlike digital audio systems, analogue systems do not require filters for bandlimiting. These filters act to prevent aliasing distortions in digital equipment. Analogue recordings do not suffer from Jitter either. This is due to analogue time being more accurate, where as digital suffers from inaccuracies. Analogue’s digital range can also be better, the softness of analogue tape clipping allows a usable dynamic range that can exceed that of some PCM digital recorders.
ADVANTAGES OF ANALOGUE The main advantage is the fine definition of the analogue signal which has the potential for an infinite amount of signal resolution. Compared to digital signals, analogue signals are of higher density. Another advantage with analogue signals is that their processing may be achieved more simply than with digital. An analogue signal may be processed directly by analogue components, though some processes arent available except in digital form.
DISADVANTAGES OF ANALOGUE The primary disadvantage of analogue signalling is that any system has noise. As the signal is copied and re-copied, or transmitted over long distances, noise becomes dominant. Electrically, these losses can be diminished by shielding, good connections, and several cable types such as coaxial or twisted pair. The effects of noise create signal loss and distortion. This is impossible to recover, since amplifying the signal to recover attenuated parts of the signal amplifies the noise as well. Even if the resolution of an analogue signal is higher than a comparable digital signal, the difference can be overshadowed by the noise in the signal. Most of the analogue systems also suffer from generation loss.