Sony VPCZ2390X - Manual (Page 103)

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Using Peripheral Devices >
Using the Noise Canceling Headphones
Using the Noise Canceling Headphones
A pair of noise canceling headphones may be supplied with your computer.
Some features and options in this section may not be available on your computer.
See the specifications to find out about the configuration of your computer.
Your computer is equipped with the Digital Noise Canceling processor that detects ambient noises and outputs an antiphase
wave to reduce the noises.
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You can use the noise canceling headphones as a microphone by using the built-in microphone on the headphones.