Sony MDR-NC500D - Manual (Page 10)

10 GB
In order that feedback type headphones obtain
a wider canceling range, it is necessary to minimize
the time delay between the output of the driver unit
and the input to the noise detection microphone.
By integrating the noise detection microphone
with the driver unit to minimize the time delay,
MDR-NC500D achieved a stable and wider range
canceling performance.
Moreover, the use of re-informed diaphragm
significantly improved the canceling performance
against environmental noise with a high sound
pressure that is generated in a very low frequency.
3.1. Operation of AI Noise Canceling function
The operation of actual AI Noise Canceling function is as follows:
1. Press the AI NC MODE button to start the analysis program. *
2. Built-in DSP analyzes the sound information of noise from the noise detection
microphone.
Its specific value is extracted from the signal and the most effective noise canceling
mode is selected.
3. The noise canceling operation is started in the selected mode.
* During analysis, reproduction of music source and noise canceling function are temporarily stopped in order to
gather exact noise information.
MDR-NC500D completes the above-mentioned processing
in a short time of about 3 seconds.
The analysis algorithm of AI Noise Canceling (AINC)
developed a proprietary calculation technique based on the
Auditory psychology emphasizing the frequencies, which make
noise more audible to the ear.
It is the very realization of “smart headphones” which can
follow man's feeling.
With the AI Noise Canceling function only made possible
by Digital, please enjoy its comfortable canceling effect.
4.Specialized Driver Unit
DSP used in
MDR-NC500D
Driver unit