A method for measuring perceived effort of understanding speech in noise was developed and tested. This method assesses perceived listening effort using a visual analogue scale in different noise types and at fixed signal-to-noise ratios.
In each signal-to-noise ratio, subjects were presented with five sentences, which they were asked to repeat. Having done this, they then rated the effort associated with listening to speech in background noise. The Dantale II corpus was used as speech material, and both unmodulated and modulated, speech-shaped background noise was used.
The reason the subjects were asked to repeat the sentences was to make sure they made an effort to understand the speech being presented. As well as rating perceived effort, they were asked to comment (using short sentences or keywords) on the effort required in each listening situation.