And they  they did a lot of experiments where th where ,  um , they take speech  and , um , e they modify  the , uh  they  they  they measure the relative importance of having different , um , portions of the modulation spectrum intact.
Yeah.
And they find that the  the spectrum between one and sixteen hertz in the modulation  is , uh  is im important for speech recognition.
Sure. I mean , this sort of goes back to earlier stuff by Drullman.