CgistFall2010ITEC2110-04Project1

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In this project I demonstrate the effect on file size (and therefore download speed) of saving an audio file in various formats


Format

File size

Dialup download time

ADSL download time

Download

Using Audacity I produced a .wav format file which is:

7.56 MB

18 minutes

9.91 seconds

click here

Using Audacity I produced a .mp3 format file which is:

943.31 KB

2 minutes & 25 seconds

1.24 seconds

click here


The effect of different sampling criteria on audio quality:


All the audio downloads (shown above) are full CD quality sampled at 44,100 samples per second with a 2 byte quantization level.

Below I demonstrate the effect of changing the sample rate and quantization level:

Format

File size

Dialup download time

ADSL download time

Download

Using Audacity I produced a .wav format file which has a sample rate of 22050 samples per second and a quantization level of 16 bits : (http://en.wikipedia.org/wiki/.wav)

5.88 MB

14 minutes

7.71 seconds

click here

Using Audacity I produced a .wav format file which has a sample rate of 22050 samples per second and a quantization level of 8 bits : (http://en.wikipedia.org/wiki/.wav)

2.94 MB

7 minutes

3.86 seconds

click here

Using Audacity I produced a .wav format file which has a sample rate of 8000 samples per second and a quantization level of 16 bits : (http://en.wikipedia.org/wiki/.wav)

2.25 MB

6 minutes

3.30 seconds

click here

Using Audacity produced a .wav format file which has a sample rate of 8000 samples per second and a quantization level of 8 bits : (http://en.wikipedia.org/wiki/.wav)

1.26 MB

3 minutes

1.65 seconds

click here

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