HighlandPark

HighlandPark is a codename for noise cancellation technology used in iPhone 4, iOS 5 and later. It is possibly developed in cooperation with Audience Inc.

syslog excerpts
*** ** **:**:** localhost kernel[0]: HighlandParkAudioDevice::start: 0x813cd000, highland-park mIICNub: 0x8117ae80, mIISNub: 0x81af6900, mSerialNub: 0x81b0a000, sampleRate = 44100, ol=8, oi=7

iPhone 4 GSM (and Rev A)
The version found inside this device is

iPhone 4 CDMA
The version found inside this device is

iPhone 4S
The version found inside this device is