Synchronized Swept-Sine: Theory, Application, and Implementation - October 2015
Effect of Microphone Number and Positioning on the Average of Frequency Responses in Cinema Calibration - October 2015
The Measurement and Calibration of Sound Reproducing Systems - July 2015
The Alteration of the Reverberation Times in a Small Theatre and a Concert Hall Using Loudspeaker Equipment
The reverberation time can be changed to a large extent by using electro-acoustical equipment. In a small theatre the reverberation time was raised from 0.75s to 1.2s, and in a concert hall from 1.5s to 3s. Exceeding these values with the help of a reverberation plate led, in the small theater, to distinct changes in the -coloring- of the sound. In the other test there was no coloring of the sound, but the reverberation time was felt to be too long. Using an artificial head with two built-in microphones the various ways in which the sound died away were recorded, and were evaluated via headphones in the laboratory. The radio transmission, which took place at the same time, was not affected as far as quality is concerned.
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