This document provides an incomprehensive guide to iPhone audio development. It discusses getting layered audio into apps by using a combination of standard compression and ADPCM encoding. It also provides some audio tips for iPhone users, such as making custom ringtones, amplifying audio using a sound deflection chamber, and normalizing volume levels using Sound Check in iTunes. The document concludes by thanking the audience and providing a URL to download the presentation.

1. An incomprehensive guide to iPhone
audio development.
IDGA ,Toronto Chapter - August 13th, 2009

2. An incomprehensive guide to iPhone audio development.
Shameless self-promotion
Collaboration between Mind Control Software
and Richard Garfield, legendary creator of the
Magic: The Gathering.
Multi-player strategy game featuring versus
battles that are ~10 minutes long.
Same game play depth and expandability of
Magic, without the intimidating deck-building
feat associated with most TCGs.
“playable by a wide audience, fairly fast, a good
amount of luck, a good amount of strategy, and
something that feels more like a paper game but
still made with a computer” - Garfield
www.mind-control.com/mindtwist/
IDGA, Toronto Chapter - August 13th, 2009

3. An incomprehensive guide to iPhone audio development.
Getting layered audio into your app
The problem
Playing multiple compressed (aac, mp3, alac) files at the
same time.
Why?
There is only one hardware uncompressor available.
Software-based decoding can cause performance
degradation.
IDGA, Toronto Chapter - August 13th, 2009

4. An incomprehensive guide to iPhone audio development.
Getting layered audio into your app
The solution
A combination of standard compression for your
largest file (i.e. background music) and IMA4
(ADPCM) encoding for other audio.
IDGA, Toronto Chapter - August 13th, 2009

5. An incomprehensive guide to iPhone audio development.
Audio tips for iPhone users
Are your pants mumbling softly, or is that your iPhone ringing?
Dealing with low ring tone volume.
Make your own ring tone! (Ringtone Expressions
www.ringtoneexpressions.com )
A loud, high-frequency ring tone is an easy fix.
IDGA, Toronto Chapter - August 13th, 2009

6. An incomprehensive guide to iPhone audio development.
Audio tips for iPhone users
For the audio elitists (I know… it’s still not as good as vinyl).
SoundClip (http://tenonedesign.com/soundclip.php)
A tuned conical deflection chamber designed
to make the audio clearer and louder.
Directs sound from iPhone toward you.
Amplifies iPhone audio by 10dB
IDGA, Toronto Chapter - August 13th, 2009

7. An incomprehensive guide to iPhone audio development.
Audio tips for iPhone users
Resistance is futile, you will be normalized.
A solution to varying volume levels in your music collection.
Go into the Playback tab of your ITunes Preferences
Enable Sound Check
Wait for it to finish, then sync your iPhone
IDGA, Toronto Chapter - August 13th, 2009

8. An incomprehensive guide to iPhone audio development.
Thank you for listening to me
You can download this presentation at:
www.harrymack.com
IDGA, Toronto Chapter - August 13th, 2009