Analog and Digital

The differences between analog data vs digital data.

Audio in multimedia has two types which is analog and digital. Both are created using the microphone that turning air pressure which is sound into an electrical analog signal.

As I written in last week topic group discussion, analog is recording made by then imprinting the signal directly onto the master record..

Digital is recording that analog signal and convert it into a digital representation of the sound, which is essentially a series of number for digital software to interpret. It can be copied and placed into disc, hard disk, or online.

Digital takes a few ‘snapshots’ of the number line, while analog takes the whole line into account. Digital record are recorded on a computer program such as Pro Tools and analog would be something that was recorded on tape and produced using manual equipment to mix.

For example, number 1 and 2 on a number line, there are actually an infinite number of points between 1 and 2. This is what analog present. For digital, it only look at certain number of fixed point between 1 and 2 (example, ½, ¼,1 2/6)

In this discussion topic, I have attached an image of wave movement of analog and digital, so that we can know the different of analog and digital wave. 




Two type of compression techniques; lossy and loselss compression. 

Lossy and lossless are category of image compression.

Lossy compression reduces the file size by permanently eliminating certain information, especially redundant information. Example of lossy compression file format is JPEG.

Lossless compression are retains raster values during compression and the file size is also reduced. For example, LZ77 is a lossless compression file type.




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