Correction, fixed noise/speech

This options takes the background noise and assumed speech spectrum into account. The button opens up a new dialog box where the necessary data can be entered as shown below.

This includes the background noise and the assumed speech level on the microphone, both expressed as octave band sound pressure levels in dB, for the octave bands that are included in the STI calculation. For RASTI only data from the 500Hz and 2kHz bands are used. The background noise can be measured with WinMLS if the input chain (including the microphone) is calibrated. Alternatively a sound level meter may be used to measure the background noise.