How do noise suppressors in older turbojet engines reduce sound footprint?

Noise suppressors in older turbojet engines primarily work through mechanisms that absorb and dissipate sound energy rather than converting frequencies. The correct choice focuses on the fundamental operation of noise suppressors which is to reduce the overall sound footprint by utilizing various designs and materials that effectively attenuate the noise produced during engine operation.

The process of absorbing sound waves involves using materials that have the ability to dampen sound, which is essential for noise suppressors. These materials are specifically designed to tackle sound vibrations, helping to minimize the noise that escapes from the engine.

Furthermore, enclosing the engine does not necessarily result in reduced noise; while it may contain some noise, it doesn't actively suppress or absorb it. Using advanced materials can indeed enhance noise suppression but without the specifics regarding frequency conversion, they do not directly contribute to reducing sound in the same way as absorption does.

Therefore, the mechanism that fundamentally aligns with how noise suppressors effectively manage sound emissions is absorption. This allows older turbojet engines to operate with a diminished sound profile while maintaining performance.