SbakerFall2010ITEC2110-04Project1

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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:

10.12 MB

24.1 minutes

13.3 seconds

click here

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

10.12 MB

24.1 minutes

13.3 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 : (link the .wav to wikipedia .wav entry)

5.88 MB

14 minutes

7.7 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 : (link the .wav to wikipedia .wav entry)

2.94 MB

7 minutes

3.9 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 : (link the .wav to wikipedia .wav entry)

2.52 MB

6 minutes

3.3 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 : (link the .wav to wikipedia .wav entry)

1.26MB

3 minutes

1.7 seconds

click here

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