Carpets and curtains deaden echoes and make it easier to distinguish `useful' sounds from unhelpful background noise.
(Carpets and curtains; deaden; echoes) (Carpets and curtains; make; it easier to distinguish `useful' sounds from unhelpful background noise)
Carpets and curtains Carpets and curtains
deaden make
echoes
it easier to distinguish `useful' sounds from unhelpful background noise