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A method for analyzing sampling jitter in audio equipment is proposed. Themethod is based on the time-domain analysis where the time fluctuations ofzero-crossing points in recorded sinusoidal waves are employed to characterizejitter. This method enables the separate evaluation of jitter in an audioplayer from those in audio recorders when the same playback signal issimultaneously fed into two audio recorders. Experiments are conducted usingcommercially available portable devices with a maximum sampling rate of 192~000samples per second. The results show jitter values of a few tens of picosecondscan be identified in an audio player. Moreover, the proposed method enables theseparation of jitter from phase-independent noise utilizing the left and rightchannels of the audio equipment. As such, this method is applicable forperformance evaluation of audio equipment, signal generators, and clocksources.