The seat rows only backscatter frequencies above a certain threshold, though, so they act, in effect, as a sound filter.

每排座椅只反射高于一定频率的声音，因此实际上它们充当的是声音过滤器。

youdao

In humans the vocal tract acts as a filter on the sound from the source, and the "source-filter theory" held that the separate, fine control of the vocal tract to be the product of a long evolution in the development of the subtleties of speech.

BBC: Helium-huffing gibbons 'sing with soprano technique'

The sound is reproduced either by the sound system of the S-Class or by Sennheiser Noise Gard headphones, which filter out any unwanted ambient noise for unparalleled listening pleasure.

ENGADGET: Brabus iBusiness luxury sedan puts an iPad at every seat, a Magic Mouse at every hide-covered armrest