# Soundproofing

Sound insulation describes the hindering of the propagation of airborne or structure-borne sound by reflecting the propagating sound at individual points of discontinuity . Sound insulation forms the basis of building acoustics and is characterized by the sound insulation value  R in dB , which indicates how little sound gets into the neighboring room.

Soundproofing is a measure for the acoustic separation of different rooms, e.g. B. in television or recording studios , against unwanted noise from neighboring rooms or from outside. One example is a sound-absorbing practice booth for musicians , in which the passage of sound is prevented with separating surfaces.

## Connection with reflection measures

The reflection is reported as

• Sound reflection factor (quotient of the sound pressure of a reflected sound wave and the sound pressure of the incident wave) or${\ displaystyle r = {\ frac {p _ {\ mathrm {r}}} {p _ {\ mathrm {e}}}}}$
• Sound reflectance ${\ displaystyle \ sigma = r ^ {2}}$

The greater the reflection factor, the stronger the sound-absorbing effect. In practice, this is achieved through the largest possible impedance jump at the reflective interface .

## Impact sound insulation

A typical topic in building acoustics is impact sound insulation . Impact sound is generated by structure-borne sound (steps, kicks, knocking), which in turn stimulates walls or ceilings to emit air-borne sound. Effective footfall sound insulation can be achieved by means of structure- borne sound insulation ( floating screed ) or airborne sound insulation measures ( suspended ceilings ).

## Differentiation from sound absorption

The sound insulation has nothing to do with the acoustic sound absorption or sound absorption required within individual rooms. This describes how much sound energy is converted into heat and is a typical issue in room acoustics .