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Sony MDR-NC300D Product Information

Sony MDR-NC300D Product Information

Noise canceling headphones
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Download this manual See also: Operating Instructions, Product Information
Noise Canceling Headphones
降噪耳机
Product Information
产品信息
MDR-NC300D
©2009 Sony Corporation
Printed in Malaysia
4-145-681-31(1)

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Summary of Contents for Sony MDR-NC300D

  • Page 1 Noise Canceling Headphones 降噪耳机 Product Information 产品信息 MDR-NC300D ©2009 Sony Corporation Printed in Malaysia 4-145-681-31(1)

  • Page 2: Table Of Contents

    Contents 1. Introduction ............................................... 3 2. Outstanding Noise Canceling Performance ..................................4 2-1 Principles of Noise Canceling Mechanism ..................................4 2-2 DNC Software Engine ........................................6 2-3 Automatic AI Noise Canceling Function ..................................8 2-4 Noise Canceling Optimization ...................................... 10 3. High Quality Sound Technology ......................................12 3-1 High Quality Sound by Digital Sound Enhancer ............................... 12 3-2 S-Master Full Digital Amplifier..................................... 16 3-3 Large 16 mm Dynamic Driver Unit ..................................... 17 4. Wearing Comfort ............................................ 18 4-1 Vertical In-The-Ear Headphones .

  • Page 3: Introduction

    1. Introduction Quiet surroundings are as important to the quality of sound reproduction as choosing the right audio equipment. But in today’s world, your actual listening environment, especially when using a portable music device, is likely to be far from ideal with exposure to all kinds of noise. Since 1995, Sony has pursued the ideal listening environment through the development of noise canceling headphones and we have succeeded in creating the ultimate noise canceling ear receivers using digital signal processing. This pamphlet describes the features of the MDR-NC300D headphones in terms of the technologies – Sony’s acoustic technology, signal processing technology and circuit technology – that have been built into the design of the headphones. Features of the MDR-NC300D digital noise canceling headphones  Outstanding digital noise canceling performance  High-quality sound design  Excellent wearing comfort...

  • Page 4: Outstanding Noise Canceling Performance

    2. Outstanding Noise Canceling Performance 2-1 Principles of Noise Canceling Mechanism The MDR-NC300D headphones are equipped with a feed-forward noise canceling (NC) mechanism which cancels noise near the eardrum by estimating what kind of noise it will be when it reaches the eardrum based on the ambient noise collected by the noise detection microphone, and generating an inverted sound waveform. As shown in the figure, the noise canceling performance greatly depends on the efficiency and precision of the NC circuit to generate the noise canceling waveform. The NC circuit uses the newly developed integrated DNC processor <CXD9952GR>. Compared with the previous analog type, it boasts excellent noise canceling performance and outstanding sound quality.
  • Page 5 Leaked noise near eardrum Noise Added in space near eardrum Detection microphone (noise canceling) Newly developed integrated DNC processor Driver unit Inverted-phase noise canceling waveform generated by NC circuit circuit <CXD99GR>...

  • Page 6: Dnc Software Engine

    2-2 DNC Software Engine Sony’s unique digital noise canceling technology and high quality audio processing technology come together in the Integrated DNC processor to maximize the merits of digital processing, as shown in the figure. The noise picked up by the noise detection microphone is digitalized by the A/D converter, and the optimal canceling signal is generated through high-speed, high-precision digital filter processing by the DNC Software Engine at the heart of the processor. After audio enhancement processing by the Digital Sound Enhancer (see page 12) via the A/D converter, the music signal from the media player is added to the noise canceling signal in the DNC Software Engine. The added signal is faithfully reproduced by the S-Master Full Digital Amplifier (see page 16), enabling high noise canceling efficiency and dynamic music reproduction.
  • Page 7 [Merits of digitalization] Noise detection microphone  In principle, computation is not affected by external electrical noise Analog Digital S-Master A/D converter circuit circuit Digital Amplifier Driver unit  High precision and no variation DNC Software Engine AI Noise Analog Digital Analyzer ...

  • Page 8: Automatic Ai Noise Canceling Function

    2-3 Automatic AI Noise Canceling Function The characteristics of ambient noise vary depending on the situation. For example, the characteristics of ambient noise on a plane, on a bus or a train, or in an office environment are different. The AI Noise Analyzer inside the processor constantly monitors and analyzes the ambient noise. This function selects in real time the most appropriate of the noise canceling modes provided by the headphones (Mode A: low to midrange frequency NC, Mode B: ultra-low frequency NC, Mode C: wideband NC). In other words, it selects the mode that minimizes noise at the eardrum. This advanced software function enables users to enjoy the optimum noise canceling effect automatically in any noise environment. Typically, “Mode A: low to midrange frequency NC” effectively reduces the noise present mainly on a plane; “Mode B: Tips ultra-low frequency NC” effectively reduces the noise present mainly on a bus or train; and “Mode C: wideband NC” effectively reduces the noise present mainly in an office environment (OA equipment, air conditioning, etc.). The AI Noise Analyzer analyzes the actual ambient noise in the user’s environment and selects the most effective noise canceling mode.
  • Page 9 AI Noise Automatic analysis in real-time, Noise Analyzer Selects optimal NC mode Noise detection microphone [Mode A: low to midrange frequency NC] [Mode B: ultra-low frequency NC] [Mode C: wideband NC] Noise canceling ratio Noise canceling ratio Noise canceling ratio Frequency Frequency Frequency...

  • Page 10: Noise Canceling Optimization

    2-4 Noise Canceling Optimization The shape of the human ear varies subtly from person to person. When you wear In-The-Ear headphones, there may be a very slight gap between your ear canal and the headphones depending on the shape of your ear. The size of the gap varies from individual to individual. Air leaking through this gap affects the loudness of the noise reaching your ears through the gap and this also affects the noise canceling efficiency. Noise canceling optimization corrects individual differences in the noise canceling effect by electrically adjusting the size and spectrum of the noise canceling signal, thereby ensuring the best noise canceling effect for each individual.
  • Page 11 Air leakage through gap Headphone Ear canal Frequency Noise canceling signal compensation by Noise Canceling Optimization Wearing headphones NC OPTIMIZE NC OPTIMIZE button for noise canceling optimization...

  • Page 12: High Quality Sound Technology

    3. High Quality Sound Technology 3-1 High Quality Sound by Digital Sound Enhancer While the headphones offer exceptional noise canceling performance, the newly developed Digital Sound Enhancer delivers clear, natural sound. The digital equalizer ensures high quality music reproduction and provides three sound modes suited to the environment and music source. Digital Equalizer The acoustical design of noise canceling headphones generally emphasizes low frequency in order to maximize the effect with limited electric power, but this impact on the quality of the reproduced sound. To solve this problem, a digital equalizer is provided on the audio input side.
  • Page 13 The digital equalizer suppresses the impact on the sound quality and delivers high quality sound that gives full play to the intrinsic performance of the driver unit. By applying the high-precision, high-sound quality digital equalizing technology accumulated through Sony’s AV amplifiers and Hi-Fi audiovisual apparatus and adopting the newly developed computation method optimized to the system, it is possible to reproduce a music source with a sense of realism from deep bass to smooth highs. Characteristic of acoustical system Characteristic of digital equalizer Total characteristic Desired characteristic Frequency Frequency Frequency...
  • Page 14 Three sound modes Three sound modes suited to the characteristics of the music source ensure easy listening in any noise environment.  NORMAL: This mode maximizes the merits of the noise canceling headphones to produce clear, natural sounds.  BASS: This mode boosts the bass sounds that give punch to modern dance music.  MOVIE: This is the sound mode suited to an AV sound source with wide dynamic range, such as a movie. Compression processing increases the volume of quiet sounds such as conversation and reduces the volume of loud sounds like explosions, thereby adjusting the overall volume to a listener-friendly level. Moreover, dialog is made much easier to hear by slight emphasis of the core midrange frequency, ensuring clear, natural sounds even on a train or plane or in other noise environments.
  • Page 15 Explosion Human voice range Output signal Explosion Input signal Compression Dialog Dialog Whisper Whisper Signal processing flow Frequency Noise  Compression effect  Midrange frequency emphasized Movie mode (Image)

  • Page 16: S-Master Full Digital Amplifier

    3-2 S-Master Full Digital Amplifier The headphones are equipped with Sony’s retuned S-Master full digital amplifying technology. Digitization right until output ensures faithful sound reproduction to a degree not achieved with analog amplifiers. S-Master S-Master Digital signal Digital logic processor Digital power amplifier Digital waveform data Audio pulse signal Analog signal S-Master power amplifier configuration...

  • Page 17: Large 16 Mm Dynamic Driver Unit

    3-3 Large 16 mm Dynamic Driver Unit 1. mm driver unit 1 mm driver unit A large 16 mm dynamic driver unit is used as the closed ear receiver. In addition to the improved canceling of loud/ultra-low frequency environmental noise, this makes the most of the merits of wideband regeneration and the broad dynamic range to produce clear, natural sounds with a wide, balanced frequency range. Integrated Structure of Driver Unit Conventional unit MDR-NC00D (MDR-NC) For the sake of miniaturization, the driver unit has been integrated with the casing. As well as eliminating unwanted air leakage from the gaps between components, this has reduced unwanted vibration and attained a smooth response in the low range.

  • Page 18: Wearing Comfort

    4. Wearing Comfort 4-1 Vertical In-The-Ear Headphones The introduction of the large 16 mm driver means that the headphones are worn with the driver positioned at right angles to the ear canal, enabling rich bass sounds to be enjoyed with no stress on the ear.

  • Page 19: Hybrid Earbuds In 7 Sizes

    4-2 Hybrid Earbuds in 7 Sizes The hybrid silicone earbuds use silicone in a combination of two hardnesses. The hard core maintains the shape of the sound exit and prevents deterioration of sound quality caused by crushing of the tip. The soft exterior allows better molding to the ear canal, providing a secure fit and wearing comfort for extended listening. Seven types of earbud are provided to suit different shapes of ear. Earbud size Section of earbud Small  Diameter  Large Low hardness silicone – High (blue) (purple) Height (orange) (green) (light blue) – High hardness silicone (red) (yellow)
  • Page 20 目录 1. 介绍 ......................3 2. 卓越的降噪性能 ....................4 2-1 降噪装置的原理 ..................... 4 2-2 DNC Software Engine ..................6 2-3 自动AI降噪功能 ..................... 8 2-4 降噪最佳化 ....................10 3. 高音质技术 ....................12 3-1 采用 Digital Sound Enhancer 的高音质 ..............12 3-2 S-Master 全数字放大器 ..................16 3-3 16 mm 大型动态驱动单元 ..................17 4. 佩戴舒适度 ....................18 4-1 垂直入耳式耳机 .................... 18 4-2 7 种尺寸的混合耳塞 ..................19...

  • Page 21: 介绍

    1. 介绍 对于声音再现的品质而言，安静的环境与选择正确的音频设备同样重要。 但在当今的世界，您实际的聆听环境（特别当使用便携式音乐设备时）可能已远离理想的环境并暴露于各种噪声中。 从 1995 年开始，Sony 致力于开发降噪耳机以寻求理想的聆听环境，并且我们成功地使用数字信号处理技术创造了最 终的降噪耳机。 本小册子描述MDR-NC300D耳机所采用的Sony声学技术、信号处理技术和电路技术等设计方面带来的优点。 MDR-NC300D数字降噪耳机的优点  非常卓越的数字降噪性能  高音质设计  极佳的佩戴舒适度...

  • Page 22: 卓越的降噪性能

    2. 卓越的降噪性能 2-1 降噪装置的原理 MDR-NC300D 耳机装有前馈降噪（NC）装置，此装置根据噪音侦测麦克风收集到的环境噪音估算到达耳膜的噪音类型， 并产生一个反向声音波形从而对耳膜附近的噪音进行降噪。 如图所示，降噪性能主要取决于NC电路的效率和精度来产生降噪波形。 NC 电路采用最新开发的集成 DNC 处理器<CXD9952GR>。与先前的模拟类型相比，其表现出极佳的降噪性能和卓越的音质。...
  • Page 23 耳膜附近泄漏的噪音 噪音 耳膜附近增加的空间（降噪） 侦测麦克风 最新开发的集成 DNC 处理器 驱动单元 NC 电路产生的反向相位降噪波形 NC 电路 <CXD9952GR>...

  • Page 24: Dnc Software Engine

    2-2 DNC Software Engine 如图所示，集成的 DNC 处理器采用的 Sony 独特数字降噪技术和高质量音频处理技术完全发挥了数字处理的优点。 噪音侦测麦克风拾取的噪音由 A/D 转换器进行数字化，并且由处理器核心 DNC Software Engine 经高速、高精度数字 滤波器处理从而产生最佳的降噪信号。 由Digital Sound Enhancer（参阅第 12 页）经 A/D 转换器进行音频增强处理后，媒体播放器的音乐信号会加入 DNC Software Engine 的降噪信号。 S-Master 全数字放大器（参阅第 16 页）会忠实再现加入的信号，并能提供高降噪效率和动态声音再现。...
  • Page 25 [数字化的优点] 噪音侦测麦克风  原则上，计算不受外部电子噪音影响 模拟 数字 S-Master NC NC A/D 转换器 电路 电路 数字放大器 驱动单元  高精度和无变化 DNC Software Engine AI 噪音 模拟 数字 分析器  数 字滤波器可产生模拟滤波器无法产生的复杂波形 Digital Sound A/D 转换器 模拟 数字 Enhancer 频率 频率 CXD9952GR Walkman 和其它 AV 设备...

  • Page 26: 自动Ai降噪功能

    2-3 自动AI降噪功能 环境噪音特性视情形而定。例如，飞机、公共汽车或火车上的环境噪音特征，或办公室环境中的环境噪音特征是不同的。 处理器内的 AI 噪音分析器持续监控并分析环境噪音。此功能实时选择耳机提供的最适当的降噪模式（模式 A：低频到 中频 NC，模式 B：极低频 NC，模式 C：宽频 NC）。换句话说，它选择使耳膜处的噪音减到最小的模式。 此高级软件功能使用户在任何噪音环境中自动获得最佳的降噪效果。 一般来说，“模式 A：低频到中频 NC”主要有效减少飞机上的噪音；“模式 B：极低频 NC”主要有效减少公 提示 共汽车或火车上的噪音；“模式 C：宽频 NC”主要有效减少办公室环境（OA 装置、空调等）中的噪音。 噪音 AI 分析器分析用户环境中的实际环境噪音并选择最有效的降噪模式。...
  • Page 27 AI 噪音 噪音 实时自动分析、选择最佳 NC 模式 分析器 噪音侦测麦克风 [模式 A：低频到中频 NC] [模式 B：极低频 NC] [模式 C：宽频 NC] 降噪比 降噪比 降噪比 频率 频率 频率 DNC Software Engine...

  • Page 28: 降噪最佳化

    2-4 降噪最佳化 每个人的耳朵形状均略微有所不同。 当您佩戴入耳式耳机时，视您的耳朵形状而定，在您的耳道与耳机之间可能会有细微间隙。间隙的大小因人而异。 此间隙造成的空气泄漏会影响噪音通过间隙到达耳朵的响度，也会影响降噪效果。 降噪最佳化通过电子调节降噪信号的尺寸和频谱来修正降噪效果的个体差异，由此确保各个个体的最佳降噪效果。...
  • Page 29 间隙的空气泄漏 耳机 耳道 频率 降噪最佳化的降噪信号补偿 佩戴耳机 NC OPTIMIZE 用于降噪最佳化的 NC OPTIMIZE 按钮...

  • Page 30: 高音质技术

    3. 高音质技术 3-1 采用 Digital Sound Enhancer 的高音质 当耳机提供出众的降噪性能时，最新开发的 Digital Sound Enhancer 可产生清晰、自然的声音。数字均衡器确保高音 质再现并提供符合环境和音源的三种声音模式。 数字均衡器 降噪耳机的声学设计通常强调低频，以便在有限的电源环境下发挥最大的效果，但是此设计会影响再现声音的质量。 若要解决此问题，音频输入端即提供了数字均衡器。...
  • Page 31 数字均衡器可抑制对音质的影响，并产生使驱动单元的固有性能最优的高音质。 通过应用 Sony 的 AV 放大器和 Hi-Fi 视听设备使用的高精度、高音质数字均衡技术，并采用可优化系统的最新开发 的计算方法，可再现从深沉低音到平滑高音的真实感觉的音源。 声学系统的特性 数字均衡器的特性 全部特性 想要的特性 频率 频率 频率...
  • Page 32 三种声音模式 符合音源特性的三种声音模式确保在任何噪音环境中舒适聆听。  NORMAL: 此模式最大化降噪耳机的优点以产生清晰、自然的声音。  BASS: 此模式会增强现代舞曲音乐的低音效果。  MOVIE: 此声音模式适合电影等带有宽动态范围的 AV 音源。 压缩处理增加会话等安静声音的音量，并减少类似爆炸等的大声声音的音量，由此 调节整体音量到适合聆听者的等级。 此外，通过轻微强调核心中频使对话更容易听到，即使在火车或飞机上或其它噪音 环境中，也能确保声音清晰自然。...
  • Page 33 爆炸 人声范围 爆炸 输入信号 输出信号 压缩 对话 对话 耳语 耳语 信号处理流 频率 噪音  压缩效果  强调中频 电影模式（图像）...

  • Page 34: S-Master 全数字放大器

    3-2 S-Master 全数字放大器 耳机装有 Sony 重新调谐的 S-Master 全数字放大器技术。直到输出时的数字化处理确保忠实的声音再现，而此程度是 模拟放大器无法达到的。 S-Master S-Master 数字信号 数字逻辑处理器 数字功率放大器 数字波形数据 音频脉冲信号 模拟信号 S-Master 功率放大器结构...

  • Page 35: Mm 大型动态驱动单元

    3-3 16 mm 大型动态驱动单元 13.5 mm 驱动单元 16 mm 驱动单元 16 mm 大型动态驱动单元用作封闭型耳朵接收器。 除了改善高/极低频率环境噪音的降噪之外，充分利用了宽频再现和宽动态范围 的优点以产生宽广、平衡频率范围的清晰、自然的声音。 驱动单元的集成结构 常规单元 MDR-NC300D （MDR-NC22） 驱动单元集成于外壳内，从而达到外形小巧的目的。同时消除了不必要的器件 间间隙的空气泄漏，减少了不必要的震动，并达到了低频范围内的平滑响应。...

  • Page 36: 佩戴舒适度

    4. 佩戴舒适度 4-1 垂直入耳式耳机 采用 16 mm 大型驱动器表明：佩戴耳机时，驱动单元可位于耳道 内的正确角度，能在不压迫耳朵的情况下，欣赏丰富的低音。...

  • Page 37: 种尺寸的混合耳塞

    4-2 7 种尺寸的混合耳塞 混合硅胶耳塞使用混合两种硬度的硅胶。坚硬的核心部分维持声音输出口的形状，并防止顶端压迫而造成的音质失真。 柔软表面改善与耳道的贴合度，实现了长时间聆听佩戴服帖且舒适。附带七种尺寸的耳塞以适合不同的耳形。 耳塞尺寸 耳塞截面图 小  直径  大 低硬度硅胶 － LL 高 （蓝色） （紫色） 高度 （橙色） （绿色） （浅蓝色） 低 SS MS － 高硬度硅胶 （红色） （黄色）...