title: Applying a Band-pass filter on the iOS
body: <p>I am developing an application where I need it to analyze the incoming frequency with the built-in microphone on the iphone/ipad. I know that I need to use FFT and I have found a framework that can help me on that. My only concern was is there is a code or framework that includes Band-Pass filtering? Suggestions are welcome.</p>
  
  <p><strong>EDIT</strong>
  Pardon my ignorance. I previously posted that I wanted to use just a Band-Pass equation, when I found out that Band-pass is both Low &amp; High Pass filters. I still welcome suggestions.</p>