The acoustical properties of a closed room influence the development in time and space of the sound pressure that is caused by the occurrence of a sound in the room. The time function originated by the sound source thus acquires, on its way to the listener, additional information concerning the room in which the sound takes place, and this the author called the room information. With electroacoustical transmission, the room information may be made audible in the listening room by way of its own channel. Measurements of the optimum loudnsess of the room information transmitted indicate that it is a function of the size and reverberation-time of the originating room.
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