Audio Algorithm/code

I need some objective-c code that can be run on the iPhone/iPad that can listen for a word and recognize when that word is said. ## Deliverables I need code written in Objective-c or C that can be run on the iPhone? to listen for a word and recognize when that word has been said.? 1. It must be fairly accurate. (I am not only listening for any sound, specifically a certain word or group of words. 2. The word(s) should be dynamic. Each area of the the application I am developing will use different words. 3. Using 3rd party libraries is fine as long as they are free to use (or cheap if you get approval from me). They just need to be able to run on the iPhone/iPad 4. Code should be well written and commented so I can understand what is going on. 5. All proposals will be considered. Questions? Feel free to ask!