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HEWLETT-PACKARD JOURNAL T E C H N I C A L I N F O R M A T I O N F R O M T H E - h p - L A B O R A T O R I E S Vol. 7 No. 3 'UBLISHED BY THE HEWLETT-PACKARD COMPANY, 275 PAGE MILL ROAD, PALO ALTO, CALIFORNIA NOVEMBER, 1955 Square Wave and Pulse Testing of Linear Systems A>J arbitrary input wave, when transmitted ber of sinusoids, the output from a linear sys through even an ideally linear system, can tem will consist of these same sinusoids modi be altered in a number of ways. Such a wave fied only in amplitude and phase. Each will be can be altered, for example, in size, shape, and transmitted by the system as if it alone were time of occurrence. There is, however, one class present (superposition). The simple sum of the of waves or functions