Podcasting in the Classroom Presented by: Jason Arruzza, AIS
What is Podcasting? § a digital audio file (usually MP 3 or AAC) made available for download on the internet through an RSS 2. 0 feed. § The web address of the media file is contained in the enclosure tag of an item in the XML file. § A podcast's RSS feed is updated each time a new media file is published. § An aggregator for podcasts (such as i. Tunes or i. Podder) is used to subscribe to the RSS feed.
Who can podcast? § anyone can create their own “radio”-style show and broadcast it to the world in very little time and at very little cost. § required: a computer, a mic and the internet.
http: //audacity. sourceforge. net/
What is Audacity? § Audacity is a rapidly evolving multi-platform soundfile editor that is freely available § Audacity 1. 2. 3 includes: § a good set of editing tools, § support for Linux Audio Developer's Simple Plugin API (LADSPA) effects, § multitrack recording capability. § Its user interface is well-designed, uncluttered and simple to navigate. § Supported file formats include WAV, AIFF, AU, SND, and MP 3; Audacity also exports to OGG format. § Standard cut/copy/paste operations are supported as well as Undo/Redo functions.
Resources § Audacity homepage/download § http: //audacity. sourceforge. net/ § Audacity Help, FAQ, etc § § Audacity Tutorials § § http: //audacity. sourceforge. net/help/tutorials Audacity wiki § § http: //audacity. sourceforge. net/help/documentation http: //audacityteam. org/wiki/ Audacity User Manual § http: //audacity. sourceforge. net/audacity-manual-1. 2. zip
About sound files § The most popular and most common cross-platform uncompressed audio file formats are. AIFF (Audio Interchange File Format - Mac) and. WAV (Microsoft Windows Wave). § both support 16 -bit, 44 KHz stereo and polyphonic sound (sound with more than two channels). § this quality is approximately 10 MB per minute in size since it is high quality). § audio file formats include u-law, which use the suffix. au and so are often called AU files § MPEG audio (suffix. mpeg and. mpg). MPEG files are compressed (ie: ~ 1/5 the size of a. wav or. aiff file) but with a slight loss of quality. § When creating a sound file can set preferences to adjust the quality of the file by adjusting Bit Rate, Channel and Sample Width § basically choosing a mono channel together with the lowest sample width and the lowest sample rate you will create a lower quality, smaller file. § Ogg is an advanced binary audio format similar to the mp 3 format. It is patent and royalty free, and is supported on most platforms.
Bit Rate § is the frequency at which bits are passing a given "point". § quantified using the bit per second (bit/s) unit. § bit rate measures number of bits/time § 4 kbit/s – minimum necessary for recognizable speech § 8 kbit/s – telephone quality § 32 kbit/s – MW quality § 96 kbit/s – FM quality § 128 kbit/s – CD quality Source: Wikipedia
Audacity Activity: § Import a sound/music file into a track § Record a new voice track over § Edit as necessary § Add effects § Save as. mp 3 file
Contact Details Jason Arruzza Education Consultant – ICT Across the Curriculum Level 4, 99 York Street, Sydney NSW 2000 Phone (02) 9299 2845 Fax (02) 9290 2274 Web aisnsw. edu. au Email jarruzza@aisnsw. edu. au ABN 96 003 509 073
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