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Characterizing Digital Audio Transformers with Induced Jitter Histograms
Transformers function in digital audio systems primarily to reject common mode noise interference, to break ground loops and to enhance balance to reduce inductive emissions. A new test characterizes the interference rejection of digital audio transformers used at the receiver input of transmission systems. A sample set of decoded frame sync clocks are accumulated by a statistical time interval analyzer. The analyzer calculates the mean value of the set of periods, the standard deviation (jitter), and provides a period histogram. The histogram and standard deviation establish a basis for comparing the high frequency interference rejection of various transformers and for quantifying the nature of the induced jitter. Test data are presented for 7 different types of transformers.
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