Mary Ann Seidler - Audio Compression

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Mary Ann Seidler's pitch about the advantages of using uncompressed audio for STL's at the annual IEEE symposium in Washington http://ow.ly/i/12Xbt

Audio Compression:
Are we squeezing the life out of radio?

Mary Ann Seidler
Elenos USA

Herb Squire

Welcome!

www.elenos.com

• 1990’s – MPEG standards introduced

• Mid 1990’s Cascading tests
performed….

www.elenos.com

ISO-MPEG Compression Guidelines

Bit Rate Number of Transcodings
384 kb/s 10
256 kb/s 5
192 kb/s 2
128 kb/s 1

www.elenos.com

Why is cascading such a problem
for these algorithms?

www.elenos.com

MPEG codecs are perceptual

www.elenos.com

Source material is often pre-compressed

• Music
• Commercials
• Voice overs
• Sound effects

www.elenos.com

Where do we have some control?
• Audio codecs
• Smart phones
• Smart phone apps
• Remotes
• Automation systems
• Satellite feeds
• Remote studios
• STL links

www.elenos.com

News
Source

News Remotes
Bureau News
Satellite

RADIO
STATION

Advertising
Automation
Agency

Voice
overs STL

Transmitter

www.elenos.com

Example of a compression chain

128k 128k 256k 256k 256k
MP3 L2 L2 MP2 MP3

News News Radio
bureau Satellite Automation STL Transmitter
source Station

www.elenos.com

“Look (or even better…listen) to what
they’ve done to my song, Ma”

www.elenos.com

“The Curse of the Cascading Codecs”
Will we soon need warning labels?

www.elenos.com

Yes, we care…

But does anyone else?

www.elenos.com

• HTC recently purchased Dr. Dre’s company for
$30 million dolllars….
– Someone is putting their money on $$ for audio
quality

www.elenos.com

Young people prefer quality audio
Survey results from Sean Olive,
Director of Acoustic Research – Harman International, 2011

www.elenos.com

Why should audio quality matter
to us in radio?

www.elenos.com

Why should audio quality matter
to us in radio?
We’ve come from this…

www.elenos.com

Why should audio quality matter
to us in radio?
…to this

www.elenos.com

It’s just too easy to turn us off

www.elenos.com

So what can we do?

Here are four suggestions:

www.elenos.com

Insist on higher bit rates

128k 128k 256k 256k 256k
MP3 L2 L2 MP2 MP3

News News Radio
bureau Satellite Automation STL Transmitter
source Station

www.elenos.com

Minimize compression in STL’s

www.elenos.com

For more information, contact me:

Maryann@elenos.com

www.elenos.com

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Mary Ann Seidler - Audio Compression

1. Audio Compression: Are we squeezing the life out of radio? Mary Ann Seidler Elenos USA Herb Squire Welcome! www.elenos.com

2. • 1990’s – MPEG standards introduced • Mid 1990’s Cascading tests performed…. www.elenos.com

3. ISO-MPEG Compression Guidelines Bit Rate Number of Transcodings 384 kb/s 10 256 kb/s 5 192 kb/s 2 128 kb/s 1 www.elenos.com

4. Why is cascading such a problem for these algorithms? www.elenos.com

5. MPEG codecs are perceptual www.elenos.com

6. Source material is often pre-compressed • Music • Commercials • Voice overs • Sound effects www.elenos.com

7. Where do we have some control? • Audio codecs • Smart phones • Smart phone apps • Remotes • Automation systems • Satellite feeds • Remote studios • STL links www.elenos.com

8. News Source News Remotes Bureau News Satellite RADIO STATION Advertising Automation Agency Voice overs STL Transmitter www.elenos.com

9. Example of a compression chain 128k 128k 256k 256k 256k MP3 L2 L2 MP2 MP3 News News Radio bureau Satellite Automation STL Transmitter source Station www.elenos.com

10. “Look (or even better…listen) to what they’ve done to my song, Ma” www.elenos.com

11. “The Curse of the Cascading Codecs” Will we soon need warning labels? www.elenos.com

12. Yes, we care… But does anyone else? www.elenos.com

13. www.elenos.com

14. • HTC recently purchased Dr. Dre’s company for $30 million dolllars…. – Someone is putting their money on $$ for audio quality www.elenos.com

15. www.elenos.com

16. Young people prefer quality audio Survey results from Sean Olive, Director of Acoustic Research – Harman International, 2011 www.elenos.com

17. Why should audio quality matter to us in radio? www.elenos.com

18. Why should audio quality matter to us in radio? We’ve come from this… www.elenos.com

19. Why should audio quality matter to us in radio? …to this www.elenos.com

20. It’s just too easy to turn us off www.elenos.com

21. So what can we do? Here are four suggestions: www.elenos.com

22. Draw up a plan www.elenos.com

23. Test your audio chain www.elenos.com

24. Insist on higher bit rates 128k 128k 256k 256k 256k MP3 L2 L2 MP2 MP3 News News Radio bureau Satellite Automation STL Transmitter source Station www.elenos.com

25. Minimize compression in STL’s www.elenos.com

26. For more information, contact me: Maryann@elenos.com www.elenos.com

27. Thank you! www.elenos.com

Mary Ann Seidler - Audio Compression

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Mary Ann Seidler - Audio Compression