Noise Control is the manner in which environmental detection is implemented in high and premium products. Six Signatures, or acoustic identifiers are incorporated into the rationale: Quiet, Speech, Speech in Noise, Noise, Machine Noise and Wind. Noise Control uses a unique method of sound qualification and quantification to determine how to process each sound.
Quiet affects low-level inputs using fixed expansion ratios of .7 for the moderate setting and .4 for the maximum setting. Speech, Speech in Noise and Noise combined together ensure environments remain comfortable by adaptations based on overall channel input level and signal to noise ratio. Machine Noise affects steady state inputs based on overall channel input level. With the wind algorithm, low frequency gain is adapted to reduce the turbulence generated by wind. This influences the low frequency channels of the hearing aid (number of channels will depend on technology level of the product).
For Quiet, there is a choice of three settings: Off, Moderate or Maximum 
. For the remaining categories, there is a choice of four settings: Off, Slight, Moderate or Maximum 
. By default, Inspire sets most of the Noise Control settings to Moderate in the Normal memory, which provides a 1 to 10 dB gain adaptation. Increasing the setting to Maximum will broaden the range of gain adaptation to 1 to 20 dB. Setting the Noise Control to Slight provides a 1 to 5 dB adaptation in gain. Setting an Noise Control to Off disables the specific feature.
The gain adaptation is level and frequency dependent. The greatest gain adaptation will occur in the channel(s) where the classified input is the loudest. For multi-memory products, the amount of gain adaptation can be set independently in each memory.