Accoustics in theatres and multipurpose halls; measures to avoid impairing the audience's hearing by high sound-pressure levels from loudspeaker reproduction— 3 стр.
Measurement and assessment of aircraft noise; aircraft noise monitoring systems within the meaning of article 19a of the Luftverkehrsgesetz (Civil Aviation Law)— 6 стр.
Measurement of airborne noise emitted by machines; enveloping surface method; machine sets in hydroelectric power stations and water pumping plants— 11 стр.