JVC HAFX40R manual Special technology for HA-NC250, Technolog, y to block, noise

Special technology for HA-NC250

●	Sound-insulating ear pads
	Soft memory foam cushions
●
	with extremely smooth surface
●
	ear pads that fit exactly on
Technolog	your ears create a seal to
	block background noise.
y to block
noise

Dual housing structure

Dual acoustic wall blocks incoming background noise.

61

Equipped with advanced noise cancellation technology

●Advanced noise cancelling with “feedback technology”

●Standard noise cancelling

Technolog y to reduce noise

Even after reducing background noise, some will remain.

A microphone close to the driver unit picks up such remaining noise and the feedback circuit produces the appropriate amount of additional anti-phase sound. Every nuance of audio becomes clear through this feedback technology.

	Microphone
			An additional amount of
			anti-phase sound is added to
		Detected	reduce noise; the microphone
			monitors noise continuously.
Anti-phase sound is		noise
						Remaining noise is
added to reduce
						almost eliminated.
noise; however				Reduced	noise
the microphone
picks up
neighbouring noise.

Add anti-phase sound to reduce noise

Microphone

Detected noise

Reduced noise

Anti-phase wave

Anti-phase wave