Talking Audio


In light of a glitch that happened late Sunday with TWiT 187, it is perhaps appropriate to talk about digital audio structuring.

There are three main sampling rates used with digital audio. Those rates are:

  • 11.025 kHz -- Wireline Telephone Quality
  • 22.050 kHz -- AM Radio Quality
  • 44.100 kHz -- Compact Disc Audio Quality
A typical sample rate that programs from Erie Looking Productions stick with is 44.1 kHz if file size caps permit. For the longest time such was not possible as the Drupal implementation LISNews ran on had a ten megabyte cap. At this point, the current Drupal implementation lets us get away with files up to twenty megabytes in size. Our sample rate and bit rate change every week as we try to optimize content to sound good within the cap we have to work with.

Something we try to avoid is using the 11.025 kHz sample. In most respects such sounds awful. It can be useful, though, if you have a sizable audience operating with lower than average bandwidth. Last night the folks at the TWiT Cottage mistakenly released in the main MP3 feed their low-resolution file encoded at the 11.025 kHz sample rate with a bit rate of only sixteen kilobits per second. Such works great if you have to be in the American Pacific on a slow link and still want content and have a high tolerance for distortion and digital artifacts.

At this point, there is no plan to release programs from Erie Looking Productions in such a low-bandwidth version. It does not seem that such will serve the audience well. If there is demand, such as getting a version of the program available under the ten megabyte cap iPhones cope with for over-the-air podcast downloads, then reconsideration may be possible.

Creative Commons License
Talking Audio by Stephen Michael Kellat is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.

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