Sony Walkman 4-141-609-11 (1) Operation Manual page 114

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Using Noise Canceling Function
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Hints
 You can change between "External Input Mode" and "Quiet Mode" (  page 115) by
selecting "External Input Mode" or "Quiet Mode" on the screen.
 If you disconnect the supplied audio input cable, the Noise Canceling function enters
"Quiet Mode" (  page 115) automatically.
Notes
 Some in-flight entertainment systems may not be connectable to the player.
 When connecting to an audio device, plug the supplied audio input cable into the
headphone jack of the device. Do not plug it into the LINE OUT jack.