(left) Frequency dependence of attenuation as ... atmospheric absorption can be neglected except where long distances or very high frequencies are involved. Ref.: Cyril Harris, "Absorption of Sound in ...

Sound waves with very high frequencies are called ultrasound ... A small device called an ultrasound probe is used, which gives off high-frequency sound waves. We can't hear these sound waves ...

Amateur radio operators and shortwave listeners have a common enemy: QRM, which is ham-speak for radio frequency interference ... in his quest to lower his noise floor. Having suffered from ...

When the sounds have very different energy distributions, or when there is a frequency dependence involved, such as with SOUND INSULATION or other noise control, then an analysis of the frequency ...