The Multitone System

In an earlier work it was shown that the connection between freedom from interference with communication in radio telegraphy and the use of transmitting sets which send out signals having the quality of a musical tone. Even were this point alone considered, such systems as employed not merely a single note but a series of definitely chosen notes would be regarded as superior. As compared with the usual quenched sets, the "Multitone" sets have another feature wherein they are more desirable. The production of the musical tone should be independent of the characteristics of the source of electrical energy, and also of the constants of the radio frequency circutits. In this respect, the method of transmission which was worked out in the laboratories of the C. Lorenz Company of Berlin is the most greneral solution of the problem so far obtained. By the use of this method, as many tones as may be desired can be simply and easily produced. Furthermore, any influence on the pitch of the musical tone by the source of electrical energy or by the radio frequency circuits is completely avoided. The electrical behavior of such sets is now considered in greater detail, in connection with a number of illustrative diagrams and photographs.