When measuring the performance of analog-to-digital converters it is necessary to measure harmonic distortion in the digital domain. A new method is described that allows the accurate measurement of harmonics to well below -100 dB without any of the usual restrictions on input frequency. The method involves the use of a modified triangular window whose length is derived from the data record by a simple zero-crossing technique. The window function consists entirely of integers and can therefore be easily implemented using fixed-point arithmetic.
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