User:Hchen2:projects 2

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Contents

Audio Project

Using 28.8Kbps for dial up downloading speed and 1.5Mbps for DSL downloading speed.

Uncompressed vs. Compressed

Format

File size

Download time (Dialup)

Download time(DSL)

Link to Download

Using Audacity I produced a 44,100hz and 32 bits[WAV] format file which is

56.6MB

4 hr 34 Min 45 Sec

5 Min 16 Sec

Click here to download this version

Using Audacity I produced a MP3 format file which is:

3.85 MB

18Min 41 Sec

0 Min 21 Sec

Click here to download the MP3 version


Quantization and Sampling Rates

CD quality audios are usually sampled at 44,100 samples per second with a 2 byte quantization level.

Format

File size

Dialup download time

ADSL download time

Download

With Audacity, here is a [WAV] format file which has a sample rate of 44100 samples per second and a quantization level of 32 bits:

56.6MB

4Hours 34 Min 45 Sec

5 Min 16 Sec

click here to download this version

With Audacity, here is a [WAV] format file which has a sample rate of 44100 samples per second and a quantization level of 16 bits:

28.3 MB

2 Hours 17 Min 22 Sec

2 Min 38 Sec

Click here to download this version

With Audacity, here is a [WAV] format file which has a sample rate of 8000 samples per second and a quantization level of 16 bits:

28.3 MB

2 Hours 17 Min 22 Sec

2 Min 38 Sec

Click here to download this version


Reflection Questions

  • What's the difference between WAV format and MP3 format and how different formats affect downloading time ? (Hint: file size; compression)
Answer: mp3 file is smaller
  • Do you know any other audio format? Please list at least two.
Answer: AIFF, RAW
  • How sampling and quantization affect audio quality?
Answer: IT CHANGE THE QUALITY OF FILE AND THE SIZE.


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Special thanks to Stephen Kent who re-organized the submission template.

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