A method for analyzing sampling jitter in audio equipment is proposed. The method is based on the time-domain analysis where the time fluctuations of zero-crossing points in recorded sinusoidal waves are employed to characterize jitter. This method enables the separate evaluation of jitter in an audio player from those in audio recorders when the same playback signal is simultaneously fed into two audio recorders. Experiments are conducted using commercially available portable devices with a maximum sampling rate of 192~000 samples per second. The results show jitter values of a few tens of picoseconds can be identified in an audio player. Moreover, the proposed method enables the separation of jitter from phase-independent noise utilizing the left and right channels of the audio equipment. As such, this method is applicable for performance evaluation of audio equipment, signal generators, and clock sources.

翻译：提出了一种分析音频设备采样抖动的方法。该方法基于时域分析，利用记录的正弦波中过零点的时间波动来表征抖动。当同一播放信号同时输入两台录音设备时，该方法能够分别评估音频播放器与录音机中的抖动。实验采用市售便携式设备进行，其最高采样率为每秒192000个样本。结果表明，音频播放器中可识别出数十皮秒量级的抖动值。此外，所提方法利用音频设备的左右声道，能够将抖动与相位无关的噪声分离开来。因此，该方法适用于音频设备、信号发生器及时钟源的性能评估。