Patent ID: 6972603
Filing Date: 2005-12-06
Classification: H04J,H04L

Abstract:
1. A Maximum Time Interval Error (MTIE) test signal generating apparatus in which a signal obtained by modulating a clock signal from a reference clock generator in terms of phase by means of a predetermined MTIE test signal is input to a maximum time interval error (MTIE) measuring unit including a low-pass measuring filter having a predetermined high-cut characteristic at an input portion thereof so as to generate the predetermined MTIE test signal which enables measurement of a predetermined MTIE characteristic based on the signal, comprising: a cycle-amplitude setting portion which sets a cycle corresponding to an observation time of each of desired plural specific points for a predetermined MTIE characteristic of plural MTIE characteristics and an amplitude corresponding to a difference in the MTIE value between adjacent specific points of the desired plural specific points; plural signal generating portions which generate plural signals each having a cycle corresponding to an observation time of each of the desired plural specific points and an amplitude corresponding to a difference in MTIE value between adjacent specific points of the desired plural specific points, the cycle and amplitude being set by the cycle-amplitude setting portion and having repetitive waveforms in which after the signal amplitude increases from its lower limit value to its upper limit value during each observation time, it decreases from the upper limit value to the lower limit value and then outputting to each of the desired plural specific points; a holding time setting portion which sets a holding time for holding the upper limit value and the lower limit value of the repetitive waveform of the signal over the predetermined time so that at least a signal cycle having the shortest cycle of the plural signals generated by the plural signal generating portions is longer than a predetermined time corresponding to the predetermined high-cut characteristic of the low-pass measuring filter in the MTIE measuring unit; and a synthesizing portion which synthesizes the plural signals output from the plural signal generating portions by summing and outputting as the predetermined MTIE test signal.