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Recording of Music on CD's.

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Introduction

Assessment 2: Recording of Music on CD's Introduction In the early 1980's when CD's were first introduced, there were required to hold data (e.g. computer software, music etc) in a digital format! What do we all want in a CD? Well for the example we would use a music CD. The main aim would be to create a recording with very high fidelity which means the similarity between the original signal and the reproduced signal. The reproduction of sound which no matter how many times a track is played would still be the same quality as you first played it! In this report, it will show you how analogue and digital technology work with CD's. Analogue Just out of general interest, the word 'Analogue' comes from two Greek words meaning "word for word". An example of how another analogue device works is a clock. The hands of the clock make a complete circuit in a minute or in an hour or in half a day, depending on which hand it is. The hands would continually go around just as the Earth turns completely around on its axis in a day. ...read more.

Middle

Digital data works exactly like this which is why it can reproduce what it had originally just by using numbers. Digital recordings can that avoids the disadvantages that analogue get. It does not try to draw the information that is being saved. As an alternative, it converts the information into a mathematical code that ignores the flaws of whatever 'medium' (The carrier between a source of information and its intended audience!) is storing the data. Figure 1.3 shows what a CD looks like: Converting Data To make output of sound better quality and efficient, we would have to convert an analogue sound into digital before it is outputted! How is this done might you ask? Well digital recording converts the analogue wave into a stream of numbers and records the numbers instead of the wave which we saw on the graph diagrams figures 1.1 and 1.2. The conversion is done by a device called an 'analogue to-digital converter' (ADC). To play back the music, the stream of numbers is converted back to an analogue waves by a 'digital-to-analogue converter' (DAC). The analogue wave produced by the DAC is put through an amplifier which produces the sound out through speakers. ...read more.

Conclusion

By connecting an amplifier with high gain to this output, differences between different players could be detected. It is even possible to determine differences between the original CD and several CD-ROM copies (the brand as well as writing speed). There is a link between the sound quality of the CD-player (used as data source only for the DAC) and the signal at the PLL sound output. This feature makes it possible for the DAC owner to listen to the 'quality' of the CD-player and possibly to improve it. The PLL sound output is something like a subjective clock spectrum analyser. Conclusion Over the years, technology has moved very rapidly especially with the recording of music as a digital signal on a CD and the way analogue signal is regenerated on a CD player. Today most would listen to a digital form of music but the processes still involve analogue signals along the way! Here we have showed that although just playing a CD could be as easy as pressing the 'Play' button, the logic and processes are somewhat unknown to many! At the end of the day these advances would only make listening to music more enjoyable for people. Name: Lan Cun Nim Student Number: 031155108 Systems & Signals (EE1FSS) ...read more.

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