. The Bell System technical journal . so infinitesimal; that is, the series of discrete lines of theFourier series spectrum merge into a continuous spectrum. Mathe-matically this continuous spectrum is represented by the expression F(t) = [s cos (qt + e) dq, (1) which is known as the Fourier integral. Physically we are to picturethis infiinte series of sustained sinusoids as having such amplitudesand phases that the algebraic sum of their instantaneous values is 2 Carrier Current Telephony and Telegraphy, by E. H. Colpitts and O. ; Transactions of the American Institute of Electrica
. The Bell System technical journal . so infinitesimal; that is, the series of discrete lines of theFourier series spectrum merge into a continuous spectrum. Mathe-matically this continuous spectrum is represented by the expression F(t) = [s cos (qt + e) dq, (1) which is known as the Fourier integral. Physically we are to picturethis infiinte series of sustained sinusoids as having such amplitudesand phases that the algebraic sum of their instantaneous values is 2 Carrier Current Telephony and Telegraphy, by E. H. Colpitts and O. ; Transactions of the American Institute of Electrical Engineers,volume XL, page 205, 1921. Application to Radio of Wire Transmission En-gineering, by L. Espenschied; presented before The Institute of Radio Engineers,January 23, 1922. 92 BELL SYSTEM TECHNICAL JOURNAL zero for all instants before and after the disturbance in question, andequal to the instantaneous value of the wave thruout its Fig. 1, curve A represents a telegraph dot, curve B gives the rela- TELEGRAPH AMPLITUDE-FREQUENCY CHARACTERISTICOF TELEGRAPH DOT
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