System Configuration Of Mdr-Nc500D - Sony MDR-NC500D Operating Instructions Manual

Noise-canceling headphones
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Comparison between Feedback Type and Feedforward Type
Feedback type
Feedforward type
Noise canceling effect
Excellent
Good
Anti dependency of noise
canceling effect against
Better
Average
individual difference / fitting
difference
Miniaturization
Less suitable
More suitable
2.2. System configuration of MDR·NC500D
The Internal Block Diagram of MDR-NC500D is shown below:
AID
converter
---+
Audio In
·
·
· ·
·
· ·
- - - - '
,
· . .
"'-.''''.
-
Headphone
"~::rt,, -+i>~[(]
Driver unit
'-<J~ction
'--:-:-----'
Microphone microphone
•••••••••
~
•••,••
~
••••. '
amplifier
Internal Block Diagram of Noise Canceling
Headphones of MDR-NC500D
The noise detection microphone of MOR-NC500D collects noise
around the ear.
The noise signal is digitized through the microphone amplifier and
high-speed AID converter and is inputted in Digital Signal Processor
(OSP). Then the DNC software engine inside DSP generates the canceling
signal, which is inverted to the original noise.
Meanwhile, the regenerative signal of a music source supplied from
the audio input terminal is digitized by the high-speed AID converter and is
inputted in DSP. Then, its frequency characteristic is adjusted by the digital
equalizer inside OSP. After the canceling signal is added, the regenerative
signal is reproduced as a sound by way of the high-speed 01 A converter,
the headphone amplifier and the driver unit.
Mixing of the reproduced sound and the outside noise at the ear
negates only environmental noise, making it possible to enjoy music etc.
calmly.
High-speed
AID,
D/A
converter
Continued

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