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Characterizing Digital Audio Transformers with Induced Jitter Histograms

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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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