sonar (n)

Lärm (m)

Sie decken Türspalte ab, um Luftströmungen, Staub- und Lärm abzuhalten.

Bei sehr hohen Lärmpegeln kommen meist noch Vibrationsbelastungen hinzu.

Dichtungen in allen Türöffnungen verhindern Lärm- und Partikelemissionen.

noise (n)

For example, rooms can be separated acoustically using special insulation designed to muffle footfall noise.

The ear is most sensitive to noise in the frequency range from 1 to 6 kHz.

Their features include low noise, low maintenance and low play.

sound (n)

The effectiveness of the sound insulation depends on the excitation frequency.

The following formula shows how wave length , frequency and sound velocity are related: .

Measurements can also be taken at the source of the sound.

噪声 (n)

声音 (n)