	US 7,522,660 B2
	Pulse pattern generating apparatus
Chie Sato, Musashino (Japan); Shinji Kobayashi, Musashino (Japan); Hirotoshi Kodaka, Musashino (Japan); Ikurou Aoki, Musashino (Japan); Kousuke Doi, Musashino (Japan); Akira Toyama, Musashino (Japan); Morio Wada, Musashino (Japan); Hiroyuki Matsuura, Musashino (Japan); Hiroshi Sugawara, Musashino (Japan); Masamichi Ohashi, Musashino (Japan); Hironori Okita, Musashino (Japan); Yasukazu Akasaka, Musashino (Japan); Tsuyoshi Yakihara, Musashino (Japan); and Akira Miura, Musashino (Japan)
Assigned to Yokogawa Electric Corporation, Tokyo (Japan)
Filed on Jul. 23, 2004, as Appl. No. 10/897,073.
Claims priority of application No. 2003-322383 (JP), filed on Sep. 16, 2003.
Prior Publication US 2005/0058190 A1, Mar. 17, 2005
Int. Cl. H04B 3/46 (2006.01)

U.S. Cl. 375—224 [702/124]

6 Claims

1. A pulse pattern generating apparatus that generates a test signal of a predetermined pattern for measuring waveform quality of a digital signal by using plural digital-analog converters and outputs the test signal to a test subject, the apparatus comprising:

a parameter setting unit for setting values of plural parameters that determine the shape of an eye pattern of the test signal;

wherein the parameter setting unit displays a screen where a user can input values via a user interface in order to set and change a cross point position, relative to the rest of the eye pattern, and to set and change an amplitude of the eye pattern;

a storage unit for storing output values to the digital-analog converters corresponding to the values of the parameters within setting ranges in which the values of the parameters are set;

an arithmetic operation unit for calculating output values to the digital-analog converters from the values of the parameters from the parameter setting unit and the output values in the storage unit;

a voltage value setting unit for setting, for the digital-analog converters, voltage values to be outputted from the digital-analog converters on the basis of the result of calculation by the arithmetic operation unit; and

wherein the arithmetic operation unit performs interpolation from the output values in the storage unit and thus calculates output values corresponding to the values of the parameters set by the parameter setting unit.