Sony MDR-NC500D 取扱説明書

ブランド: Sony

モデル: MDR-NC500D

タイプ: 取扱説明書

Sony MDR-NC500D は、音楽や映画鑑賞中の周囲の騒音を低減し、静寂空間を作り出すノイズキャンセリング機能を搭載したヘッドホンです。

このノイズキャンセリング機能は、ヘッドホン本体に搭載された小型の集音マイクで周囲の騒音を検出して、その騒音を打ち消す逆位相の「キャンセル信号」を作り出してドライバーユニットから再生します。

これにより、騒音低減を実現し、より明瞭な音楽や映像を楽しむことができます。

また、ノイズキャンセリング機能を調整するAIノイズキャンセリング機能も搭載し、シーンに合わせて最適なノイズキャンセリング効果を得ることができます。

さらに、軽量メカニズムを採用し、長時間使用していても疲れにくい設計となっています。

本体に再生信号とキャンセル信号を重ねて再生することにより、騒音は小さくなり、よりクリアに音楽を聴くことができます。

Sony MDR-NC500D は、音楽や映画鑑賞中の周囲の騒音を低減し、静寂空間を作り出すノイズキャンセリング機能を搭載したヘッドホンです。

これにより、騒音低減を実現し、より明瞭な音楽や映像を楽しむことができます。

さらに、軽量メカニズムを採用し、長時間使用していても疲れにくい設計となっています。

本体に再生信号とキャンセル信号を重ねて再生することにより、騒音は小さくなり、よりクリアに音楽を聴くことができます。

Product Information

3-280-434-02(1)

MDR-NC500D

Noise Canceling

Headphones

.........................................................................

........................................

2.1.

..........................

2.2.

.....................................................................

2.3.

..................................................................

3 AI

........................................

3.1. AI

..........................................

.............................................

.........................................

...........................................................

...............................................................

7.1.

..............................................................................

7.2.

...........................................................................

7.3.

.......................................................................

7.4. 3

...................................................................................

7.5.

BTL

.....................................................

....................................

1.1.

..............................................................................

•

•AIArtificial Intelligence

•

• SN

•

1 2 3

2.1.

NC NC

2.2.

A/D DSP

DSP DNC

DSP DSP

D/A

A/D,D/A

MDR-NC500D

Audio In

A/D

DSP

DNC

D/A

A/D

2.3.

DNC

DSP

DNC

NC NC

3 AI

NC C

NC A

NC B

3.1. AI

1 AI NC MODE *

2 DSP

AI AINC

DSP

AV Hi-Fi

195 g * 10 %

* MDR-NC60

7.1.

7.2.

7.3.

7.4. 3

3 *

AC 3

AC 100 V 240 V

3 2

7.5. BTL

BTL Bridged Transformer-Less

1.1.

Total Noise Suppression Ratio :

TNSR

TNSR = 10 log (P / P

)

•P

•P =

NC A

NC B

NC C

20.0

17.0

14.9

TNSR 20 dB

ON OFF

(OFF)

(ON)

TNSR

•

• 25 dB A

18.0

20.3

15.0

17.1

18.3

18.9

Content

1. Introduction .......................................................................................................... 4

2. Principle of Operation of MDR-NC500D and Its Configuration ......................... 5

2.1. Feedback Type and Feedforward Type .......................................................................... 6

2.2. System configuration of MDR-NC500D ....................................................................... 7

2.3. Advantages of Digitization ............................................................................................ 8

3. AI Noise Canceling Function ............................................................................... 9

3.1. Operation of AI Noise Canceling function .................................................................. 10

4. Specialized Driver Unit ...................................................................................... 10

5. High-Quality Sound Unique to Digital .............................................................. 11

6. Weight saving mechanism .................................................................................. 12

7. Other Features .................................................................................................... 13

7.1. Monitor function .......................................................................................................... 13

7.2. Swivel mechanism ....................................................................................................... 13

7.3. Detachable connecting cord ........................................................................................ 13

7.4. Power supply ...............................................................................................................13

7.5. High-quality sound BTL headphone amplifier ............................................................ 13

Appendix: Indication of Canceling Performance

for Noise Canceling Headphones ....................................................................... 14

1.1. Total Noise Suppression Ratio .................................................................................... 14

MDR-NC500D is the Digital Noise Canceling Headphones, which Sony developed as the

first of their kind in the world.

For this development, Sony put in all of its acoustical analysis technology, digital signal

processing technology and transducer technology.

By digitizing the noise canceling function, we succeeded in improving the performance in

the following points which, were difficult to be addressed with the conventional analog signal

processing:

• High canceling performance

• AI (Artificial Intelligence) Noise Canceling function

• Excellent sound quality

• Higher Signal to Noise ratio

1.Introduction

2. Principle of Operation of MDR-NC500D

and Its Configuration

The noise canceling headphones make a canceling signal by analyzing with their noise

canceling circuit the surrounding noise collected by the small noise detection microphone built

in their main body.

With this canceling signal superimposed on the regenerative signal from the connected

equipment, reproduction from the driver unit reduces surrounding noise and makes it possible

to listen to music more clearly.

For the noise canceling, the following two methods are mainly used:

• Feedback type

• Feedforward type

1. Waveform of noise

(original sound)

Surrounding noise is collected by

the noise detection microphone

built in the headphones and its

signal is analyzed with the noise

canceling circuit.

2. Inverted sound

waveform

The inverted sound, which can

negate the analyzed noise, is

generated.

3. Sound waveform

canceled by

superimposition

By overlaying the original sound

with the inverted sound, the

original sound is negated. This

reduces noise at the eardrum.

Continued

2.1. Feedback Type and Feedforward

Type

Feedback type

The noise canceling function of the “feedback type” is used in MDR-NC500D.

In the feedback type, the noise detection microphone is placed close to the ear.

By collecting noise in the position closer to the ear, a noise canceling effect with high

accuracy can be obtained.

The audio signal of noise collected by the noise detection microphone is analyzed on real

time with the noise canceling circuit (NC circuit), producing a canceling signal to always

minimize the noise at the eardrum. The canceling signal is reproduced from the driver unit.

Using this method enables the cancellation effect to be increased with the changing

environmental noise addressed.

Feedforward type

In the feedforward type, the noise detection microphone is attached outside the

headphones.

The NC circuit analyzes the noise signal collected by the noise detection microphone to

estimate what kind of sound the noise will become when it comes to the eardrum. And from

this estimated result, a canceling signal to minimize the noise is made and it is reproduced

from the driver unit.

This type enables miniaturization of the headphones since it is not necessary for the noise

detection microphone to be located near the ear where space is limited.

Feedback type Feedforward type

Noise

Driver unit

Noise detection

microphone

NC circuit

Noise

Driver unit

Noise detection

microphone

NC circuit

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Sony MDR-NC500D 取扱説明書

ブランド: Sony

モデル: MDR-NC500D

タイプ: 取扱説明書

Sony MDR-NC500D は、音楽や映画鑑賞中の周囲の騒音を低減し、静寂空間を作り出すノイズキャンセリング機能を搭載したヘッドホンです。

これにより、騒音低減を実現し、より明瞭な音楽や映像を楽しむことができます。

さらに、軽量メカニズムを採用し、長時間使用していても疲れにくい設計となっています。

本体に再生信号とキャンセル信号を重ねて再生することにより、騒音は小さくなり、よりクリアに音楽を聴くことができます。

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