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what about<br />
<br />
1-lowpass = highpass <br />

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Neither comment fully answered my question but each was helpful in giving me ideas and links to other resources so I'm splitting the points amongst everyone for their assistance. 
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Neither comment fully answered my question but each was helpful in giving me ideas and links to other resources so I'm splitting the points amongst everyone for their assistance.

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I was wondering if someone has a software implementation of a low and high pass filter for audio processing. My search results brought up a basic low pass but no high pass implementations. <br />
<br />
Although any implementation would be helpful I would be particularly happy with an implementation in Objective C using the AVAudioRecorder class<br />
<br />
Note: current low pass implementation I've found: <a href="http://mobileorchard.com/tutorial-detecting-when-a-user-blows-into-the-mic/" rel="ugc">http://mobileorchard.com/tutorial-detecting-when-a-user-blows-into-the-mic/</a><br />
<br />
Thanks for you help
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I was wondering if someone has a software implementation of a low and high pass filter for audio processing. My search results brought up a basic low pass but no high pass implementations. 

Although any implementation would be helpful I would be particularly happy with an implementation in Objective C using the AVAudioRecorder class

Note: current low pass implementation I've found: http://mobileorchard.com/tutorial-detecting-when-a-user-blows-into-the-mic/

Thanks for you help

Low/High Pass Filter (Audio)

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.

An algorithm is a self-contained step-by-step set of operations to be performed. Algorithms exist that perform calculation, data processing, and automated reasoning. Starting from an initial state and initial input (perhaps empty), the instructions describe a computation that, when executed, proceeds through a finite number of well-defined successive states, eventually producing "output" and terminating at a final ending state. The transition from one state to the next is not necessarily deterministic; some algorithms, known as randomized algorithms, incorporate random input.

Algorithms

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