ITEC2110:Fall2010:PodcastProject:wtaylor

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William Taylor's Podcast (Audacity) Project

Using 28.8Kbps for dialup downloading speed and 1.5Mbps for DSL downloading speed. Using 1024 as the conversion between KB and MB. Second remainders above .5 rounded up.

Uncompressed vs. Compressed

Format

File size

Download time (Dialup)

Download time(DSL)

Link to Download

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

39.5 MB

3 Hours 7 Min 16 Sec

3 Min 31 Sec

file is too big for download

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

3.6 MB

0 Hour 17 Min 4 Sec

0 Min 19 Sec

Click here to download this 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

DSL download time

Download

Using Audacity I produced a .wav format file which has a sample rate of 44100 samples per second and a quantization level of 32 bits:

10.6 MB

0 Hours 50 Min 15 Sec

0 Min 57 Sec

Click here to download this version

Using Audacity I produced a .wav format file which has a sample rate of 44100 samples per second and a quantization level of 16 bits:

10.6 MB

0 Hours 50 Min 15 Sec

0 Min 57 Sec

Click here to download this version

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:

10.5 MB

0 Hours 49 Min 47 Sec

0 Min 56 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)(Read the wiki page for more information)
Answer: WAV is lossless uncompressed audio and MP3 is lossy compressed audio. Since WAV is uncompressed, it is much larger and will take much longer to download than an MP3.
  • Do you know any other audio format? Please list at least one.
Answer: OGG (Ogg Vorbis), FLAC (Free Lossless Audio Codec)
  • How sampling and quantization affect audio quality?
Answer: Sampling affects the number of sound samples recorded (the integrity and clarity of the recording). The fewer samples there are, the more information lost and thus the sound is more distorted. Quantization affects the accuracy of the samples. The more bits in quantization, the more true the recording sounds to the source.



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

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