Process for testing A/D and/or D/A converters or electric transmission networks comprising such converters or connected in series with said networks, particularly for testing codecs for PCM apparatuses, and device for the application of said process

摘要

Method for testing analog-to-digital converters and / or digital-to-analog converters or communications transmission sections which contain such converters or are connected in series with them, for digital communication devices, in particular for testing codecs for PCM devices, and Device for performing the method. The device under test is loaded with an analog, preferably sinusoidal, periodic measurement signal or with digital samples of such a measurement signal, with a numerical ratio between the period of the measurement signal and the system-specific sampling period such that all sampling times within a predetermined test period have different relative time positions in the periodicity interval of Have measurement signal. This creates a large amount of output information from the test object, which in its entirety describes the test object's response to the measurement signal as precisely as desired. This output information is optionally stored in a memory after analog-digital conversion in a standard encoder and is available for determining the properties sought for the test object, e.g. of the level-dependent distortions, using a computer.