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To measure the distortion factor, the PWM output signal must be converted to an analog signal. Add a low-pass filter (LC filter) in series with the output of the class-D Speaker Amplifier and convert it to an analog signal. For the constants of the low-pass filter (LC filter), please refer to the datasheet. When using Audio Precision's Audio Analyzer, input the analog signal converted by AUX-0025 to the Audio Analyzer to measure the distortion factor.
