H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
324/36, 340/71,
H04Q 1/20 (2006.01) G01R 27/28 (2006.01)
Patent
CA 1157133
Favin-20 75. MULTITONE FREQUENCY RESPONSE AND ENVELOPE DELAY DISTORTION TESTS Abstract of the Disclosure Accurate and reliable measurement results are obtained in a test system (FIG. 1) employing digital data acquisition units when measuring frequency response or envelope delay distortion of a network or communication facility by employing a unique test signal (21-tone) including a plurality of tones, each tone having amplitude, frequency phase component values determined and assigned in accordance with prescribed criteria. The phase component values are determined in accordance with a relationship dependent on the number of tones in the test signal, and in one example, are initially assigned on a random, one-to-one basis to the tones. In a specific embodiment, a test signal is utilized having 21 tones. Further problems arising from nonlinearities on the facility under evaluation are minimized by transmitting the 21-tone test signal a plurality of times and by reassigning the phase component values to the tones each time the test signal is transmitted. In a specific example, the phase component values are re- assigned to the tones in counterclockwise, circular fashion after each transmission of the test signal until each tone has taken on each phase component value. Once measurements, i.e., data records, of the transmitted test signal have been obtained, they are utilized to obtain a spectrum, and in turn, the frequency components of the spectrum are employed to obtain the desired measurement of frequency response or envelope delay distortion.
364829
Favin David L.
Lynn Peter F.
Snyder Paul J.
Kirby Eades Gale Baker
Western Electric Company Incorporated
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