akustik_profi_5e91bd-1669206959699__PID:538f0ad4-3de4-4001-9947-0bcc69e34ca3

Acoustics lexicon

Reverberation ("t" time and calculation)

  • ... is the significant room acoustic parameter...
  • ... is the time that elapses until the sound level in the room has dropped by 60 decibels
  • ... can be easily measured
  • ... or can be roughly estimated by sighting

Source: W.C. Sabine

clip3db282a7-1669632062426__PID:a8b336d5-22c6-4e03-b4e9-572ca10317c5

Sound attenuation = Sound absorption ("a")

  • Room acoustic parameter
  • Obstruction of sound propagation by absorption of airborne sound (physical definition).
  • The sound is not reflected from the surface, but absorbed
  • Unpleasant reverberation is reduced by absorption
  • Goal: Change room sound to improve room acoustics, create optimal listening conditions.

Sound insulation

  • Building acoustics parameter
  • Improve acoustic separation between rooms

Frequency ranges ("Hz")

  • Frequency = The frequency of oscillations. Small number of oscillations produce low tones, the more oscillations, the higher the tones.
  • Room acoustics: 63 - 8,000 Hz
  • Hearing range of the human ear: 16 - 20,000 Hz
  • Building acoustics: 100 - 3,150 Hz

Sound pressure level dB (A)

  • is a logarithmic quantity for describing the strength of a sound event. Colloquially, sound level usually refers to loudness or noise intensity.
  • We perceive a 10 dB increase in level as approximately doubling the volume Examples:
  • Kindergartens: approx. 80-85 dB
  • quiet conversation 40 - 60 dB
  • heavy road traffic 70 - 90 dB

Standards / Guidelines / Recommendations

  • DIN 4109: Sound insulation in building construction
  • ArbStättV and UVV Noise § 15

Recommendations only:

  • DIN 18041: audibility in small to medium-sized rooms
  • DIN 18032: Audibility in sports halls - Halls and rooms for sports and multipurpose use
  • VDI 2058: Assessment of noise at the workplace taking into account different activities
  • VDI 2569: Sound insulation and acoustic design in the office

Evaluation of the sound absorption capacity of materials

  • a: Schallabsorptionsgrad: Werte zwischen 0 (vollständige Reflexion) und 1 (vollständige Absorption). Absorption je nach Frequenz unterschiedlich.
  • as: Frequency-dependent sound absorption coefficient: absorption values at 18 frequencies between 100Hz -5000Hz
  • aw: weighted / weighted sound absorption coefficient: measure of sound absorption capacity: a value between 0 and 1. For complete reflection, a=0, for complete absorption, a=1.