Sony A846 - Manual (Page 96)

ModelName: Falcon_E
PartNumber: 4-164-613-11
  Using the Noise Canceling Function
Table of
Cont
ents
Home Menu
Inde
x
Listening to External Audio Sources
[External Input Mode]
You can enable the Noise Canceling function when you listen to audio from
external audio sources, such as audio devices in airplanes.
Using with external audio devices
Using with in-flight entertainment systems

Connect the supplied headphones to the player, and from the
Home menu, select [Noise Canceling]

[Noise Canceling: On/
Off]

[On].

Connect the audio source device to the player using the supplied
audio input cable.

From the Home menu, select [Noise Canceling]

[NC Modes].
You can listen to the audio source device with reduced ambient noise.
Continued 
To headphone jack
Supplied audio input cable
Supplied plug adaptor
Supplied audio input cable
To in-flight entertainment systems
BACK/HOME button
5-way button
[Noise Canceling]