Basics – Signals und sound

• characteristics of signals and sound
  • description of harmonic quantities
  • statistical quantities for describing signals
• sound pressure level (SPL)
  • definition of sound pressure level
  • summation of sound pressure levels
  • averaging
• Bandpass filter – Third octave and octave filters
• Sound power and sound power level

Perception and evaluation of sound signals

• weighting in frequency domain
• weighting in time domain
• rating of sound, rating level according to TA Lärm

Sound propagation in free field

• plane wave
• impedance
• sound intensity
• spherical wave

Sound reflection, sound transmission and sound absorption

• power balance
• surface impedance und reflection factor
• sound insulation

Fundamentals of room acoustics

• reverberation time of rooms
• reverberation time and sound absorption
• sound power and sound pressure in the diffuse sound field
• sound pressure level and sound power level in rooms
• technical sound absorbers