Emphasis

No. 4 is for selecting emphasis. For normal usage we do not recommend emphasis, the exception is if you are using MLS as stimulus. If you are measuring using MLS and you are not measuring speech parameters (STI/RASTI), we recommend using Pink as filter

If you are measuring STI/RASTI and do not require to include distortion components, you can use sine sweep as excitation signal instead of MLS and no emphasis. The exponential sine sweep separates the distortion components from the measurement and can therefore not be used if distortion is to be included (distortion will give a poorer STI/RASTI rating).

If you are measuring STI/RASTI and want to include background noise in the measurement, you should use Pre/Output only and select filter STI/RASTI as shown below.

If you are measuring STI/RASTI and want to include background noise in the measurement, you also need to set the total duration exactly twice the length of the maximum decay time. An example of this is shown below