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I changed the deployment target to 6.1 and I am running the sample app on an iPhone 6 with iOS 8.1.2 and apple corded headphones. The apple headphones helped reduce the noise.
I did some more tests between OpenEars 2.0 and 1.71, and I am still getting a bit more noise with 2.0. I have found these settings to work best for me so far:
[[OEPocketsphinxController sharedInstance] setSecondsOfSilenceToDetect:0.2];
[[OEPocketsphinxController sharedInstance] setVadThreshold:3.0];
I was hoping for better recognition accuracy and better noise reduction in 2.0 because I wanted to add more words to my vocabulary and more functionality to my app. I will continue testing, but I will consider this case closed. Thanks!