Two General Classifications of Sound or Noise:
Ambient Noise, or Airborne Sound, includes conversation, television, radio, dog barking, etc. This type of sound is measured by its Sound Transmission Class (STC).
Impact Sound is the resulting vibration or noise created when objects collide with the flooring surface, such as heels when walking or running on the floor, dropping items on the floor, a bouncing ball, dragging a chair across the floor, etc.This type of sound is measured by its Impact Insulation Class (IIC).