. Elements of acoustical engineering. Electro-acoustics; Sound. 298 ARCHITECTURAL ACOUSTICS two stations. The master unit contains an amplifier, microphone, loud speaker, and a talk-listen switch. The remote unit consists of a micro- phone, loud speaker, and talk-listen switch. In some of these systems the loud speaker with suitable electrical compensation is also used as a microphone. Additional stations and appropriate switching systems may be added for communicating between a number of rooms. The voice currents are carried in two ways: in one by direct wire, and in the other by using a high
. Elements of acoustical engineering. Electro-acoustics; Sound. 298 ARCHITECTURAL ACOUSTICS two stations. The master unit contains an amplifier, microphone, loud speaker, and a talk-listen switch. The remote unit consists of a micro- phone, loud speaker, and talk-listen switch. In some of these systems the loud speaker with suitable electrical compensation is also used as a microphone. Additional stations and appropriate switching systems may be added for communicating between a number of rooms. The voice currents are carried in two ways: in one by direct wire, and in the other by using a high frequency carrier on the power mains. The latter system does not require wiring but has the disadvantage that in large buildings having several separate systems cross-talk may occur. J. Radio Receiver Operating in a Living Room^''. — The radio receiver and phonograph represent by far the largest number of complete reproducing systems. For this reason, the performance of a radio receiver in a room is an extremely important problem. Equations , and for n^ / POSlTlONSl. /V/iA 0 IMA in l^i\l\J "jvqy]"i/i^iw|nw^| PLAN VIEW (/I 10 u IT 0, 10 30 - A. -^ f\ \M\HK 4 "r WVw HiimwvLj n Fig. Apian view of a living room with a radio receiver. The graphs show the response frequency characteristics for various positions in the room. the direct and reflected sound are applicable to a radio receiver in a room. In the case of a theatre it is possible to adjust the loud speakers so that the direct sound is the same in all parts of the auditorium. It is not practical to arrange the loud speakers in a radio receiver so that there will be no variation of the direct sound with distance. In view of the rather small distances and relatively small volume of the room this is not very important. It is important, however, that the directional characteristic be independent of the frequency and sufficiently broad to send direct sound into all listen- ing areas. The
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