iPS 232: Andrew’s Audio Data-Transfer Adventure

Panel: Jaim Zuber Andrew Madsen Gui Rambo Special Guest: None In today’s episode, the iPhreaks panel talk about Andrew’s client project that he’s been working on. To combat an issue, he has been using the audio port on the iPhone in order to transport data. With this, you don’t need any approval from Apple and the hardware is very simple. They go more in depth about how this process works and how iPhone updates affect it, such as the loss of the headphone jack. In particular, we dive pretty deep on:  About the ProjectHow does it work?Bell 202Frequency Shift KeyingHow does it work with iPhones without new headphone jacks?What libraries are available?JM FSK-25 ModemAndrew wrote his own library as wellHow do you get around transmission issues?Erroring checkingWhat type of device is on the other side?How do you structure your data?What other apps can use this?How is the audio with Bluetooth?Tech supportGetting into the DSP weedsZero cross detector to determine frequencyChannel CodingHow can I learn about the Core Audio APIs?Audio Queue ServicesAnd much, much more! Picks: Gui System-Bus-Radio Andrew 34th Anniversary of the Original MacAltair 8800 Playing Music Over Am RadioMini vMacSoft Modem Arduino Library Jaim Trade Wars