Loading patent…
AssigneeSiemens Aktiengesellschaft
InventorsGerhard Blaess, Karl Bauernfeind
Estimating the term…
Cross-talk attenuation characteristics and/or other transmission characteristics are measured by means of a method which applies a test pulse to the input of an object under test, the test pulse being composed of a plurality of component frequencies having predetermined amplitudes and initial phase angles, with the output of the test object being evaluated by means of Fourier analysis, using an FFT processor. The effective noise is substantially reduced by transmitting plural test pulses, and calculating the mean value of plural results produced sequentially by the FFT processor. Alternatively, the effective noise is reduced by reducing the widths of the effective pass bands of the evaluation by carrying on the evaluation over a period which exceeds the period of a single test pulse, or by setting the amplitudes of some components of the test pulse to zero and increasing the amplitudes of the remaining components.
A method of measuring the transmission characteristics of a test object by applying a test pulse to the input of the object and by evaluating, by Fourier analysis, the deformation of the test pulse as it is produced at the output of the object under test, said test pulse being formed of a plurality of components having different frequencies and predetermined amplitudes and initial phase angles, and formed according to the equation:
A method of measuring the transmission characteristics of a test object by applying a test pulse to an input of said test object, and by evaluating, by Fourier analysis, the deformation of said test pulse as it is produced at the output of said object under test, said test pulse being formed of plural components having different frequencies and predetermined amplitudes and initial phase angles, and formed according to the equation:
Apparatus for measuring the transmission characteristics of a test object comprising in combination first storage means located at the input side of an object under test for storing a plurality of sampling values corresponding to the magnitude, at consecutive time intervals formed of a plurality of frequencies, means of a test pulse for reading out said sampling values from said first storage means in succession, means for applying said test pulse to the input end of said object under test, second storage means at the output of said object under test for storing a first set of amplitude values, means at the output of said object under test for sampling sequential intervals of the test pulse as it is produced at said output and for supplying said sampled values to an FFT processor, apparatus connected to said FFT processor for forming the mean value of a plurality of results produced by said FFT processor, and means for comparing said mean values with said first set of stored values for determining a transmission characteristic of said object under test.
Dependencies are inferred from the claim text.