Raumakustische Untersuchungen in zahlreichen Konzertsälen und Rundfunkstudios unter Antoendung neuerer Meβverfahren

The following acoustical measurements have been carried out in 31 different rooms (V = 550 to 22 000 m³):

1. Measurement of the reverberation time as a function of the frequency,

2. Recording of the reverberation curves with the “impulse glide method”,

3. Measurement of sound pressure as a function of the frequency and calculation of the frequency irregularity,

4. Recording of the directional distribution of the sound at 2 kc/s and calculation of the “directional diffusiveness”,

5. Recording of the reflections of a short pulse and measurement of the “50 ms energy part”.

The results of these measurements show that only the methods 4 and 5, developed according to the geometrical conception of room acoustics, give more information for the judgement of the hearing conditions of a certain place in a room than the reverberation time does. The subjective significance of the observed phenomena has still to be cleared in detail by means of hearing tests carried out with suitable electroacoustical methods. For this purpose the measured directional distributions and time sequences of the sound reflections will be very useful.