In this case, the compression is lossless. This is nice example of digital compression - recording the data in a way which takes up less space, but you can still recreate the original signal. These change numbers tend to be small, so it turns out they can be recorded more compactly (requiring fewer 0's and 1's). So one way to 'compress' the audio, so it takes up less space, is to record just the changes - for each sample, record how much change it is from the previous sample. For audio, the samples tend to look like this: 12000, 12002, 12006, 12007, 12010, 12006, 12005.Īs a practical matter, each sample number tends to be very close to the sample numbers that come just before and just after it in time. With this picture of a signal digitized into a series of sample numbers, you can understand a bit how compression works. Lossy compression works very well with media image/sound/video data.As a practical matter, MP3 sounds great.very effective lossy compression, about 10x less space

The compressed version does an ok lossy job, using about half the space.On playback, estimate the missing numbers as the average of the surrounding numbers Example lossy scheme for the audio data:.This compression is lossless, recreating signal perfectly.Compression: rearrange the data to use fewer bytes.The resulting numbers are much smaller, requiring fewer bytes to store.

Then record the differences, one sample to the next (aka delta).

What if we just record the first number.

The numbers are quite near to each other - typical for signals.

Suppose we have this series of sample numbers:.

Lossless compression keeps all the original detail (vs.Compression adjusts how data is stored to use fewer bytes.

Mp3 compressor registration code