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Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science [email protected]

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Page 1: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Automating Course Content Distribution

with PodcastingRichard Lucic

Associate Chair of Computer [email protected]

Page 2: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Topics

What is Podcasting?

Podcasting Tools

Digital Audio Concepts

Context for Podcasting in Education

Outcomes

Podcasting Resources

Page 3: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

What is Podcasting?Subscription-Based Automated Media File Delivery

Server-Client Model

Built on RSS & XML (ISIS 270 BodyWorks Course)

Grass roots Media ! (www.podcastalley.com)

Going Mainstream?NASA

NPR

Sound of Medicine, Indiana University

Page 4: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

iPodderX Podcast Client

Page 5: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Podcasting Tools

Clients

Servers

Aggragators (iPodder.org)

Audio Recording Gear (NASA vs Reel Reviews Radio)

Page 6: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Audio Recording Gear

16 bit mono at a sample rate of 8 kHz,

.wav (PCM)

Page 7: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Audio Recording Gear

16 bit stereo at a sample rate of 44.1 kHz,

.wav or MP3

Page 8: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Audio Recording Gear

16 bit stereo at a sample rate of 44.1 or

48 kHz,.wav, MP3, MP2, or .bwf

Page 9: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Audio Recording GearBehringer Eurorack UB 802 Mixing Board

Marantz PMD 670 Digital Recorder

Symetrix 528e Voice Processor

Mic Preamp

De-esser

Compressor

Equalizer

Aphex 204 Aural Exciter and Optical Big Bottom

ElectroVoice RE 20 Microphone

Page 10: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Audio Processing Software

Audacity

Bias Peak 4.x

BBE Sonic Maximizer

Lame MP3 Encoder

Page 11: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Digital Audio Concepts

Sound Wave Travels at 770mph

Voice 300-3500 Hz

Hearing 20- 20,000Hz

Page 12: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Bit Depth vs Sample Rate

Time

Bit Depth

Sample Rate

Page 13: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Bit Depth

Bit depth of 16 provides a resolution of 65,536 levels

Page 14: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Sample Rate

Nyquist Theorem states that 22,050 Hz sample rate can produce frequencies up to 11,000Hz..... plenty good for voice (300-3500 Hz)

Page 15: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Audio Tradeoffs

CD 44.1 kHz, 16 bit depth

Pro audio 48 kHz, 24+ bit depth

Why not sample at max possible?22-44 kHz just capturing noise

The more info you present to the encoder, the more bandwidth it must utilize to reproduce it.

File size become unnecessarily large

Page 16: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Recommendation for Podcasting

Bit Depth 16

Sample Rate 22,050 Hz (some MP3 players do not play files recorded at sample rates of 22 or 48 kHz) = 5 mbytes/min

Encode to MP3 at 64 Kbps = 0.5 mbytes/min

Include ID3 Tag Metadata

Page 17: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Context for Podcasting in Ed.Record Lectures

Multimedia File Portability

Field Interviews

Audio Report Assignments

Sound Recordings

Podcasts

Page 18: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

OutcomesEnhanced Learning

Increased Enthusiasm/Quality

Ubiquity/Portability

Facilitation

Preparation Overhead

Audio Quality

Clipping

Reel Reviews Radio

NASA

File Naming Conventions

Page 19: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Clipping

Page 20: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

File Naming Convention

Page 21: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Podcasting ResourcesTools

http://www.podcastexpert.com

http://www.podcast.net

http://www.reelreviewsradio.com

Worth Listening Examples

http://www.itconversations.com

http://www.graperadio.com

Page 22: Automating Course Content Distribution with Podcastinglucic/podcasting.pdf · Automating Course Content Distribution with Podcasting Richard Lucic Associate Chair of Computer Science

Contact Info

[email protected]

919-660-6524