音频应用中麦克风的MEMS技术

　　音频应用中麦克风的MEMS技术

　　新一代的麦克风为新功能、高质量的音频和更低的成本打开了机会。

　　使用相同的CMOS硅技术集成电路，微机械器件（MEMS）比传统的麦克风更小，更可靠，可以表面安装。这允许麦克风被放置在许多不同的地方，开辟新的功能，如噪声消除，以及允许安装麦克风阵列，用于检测和指导音频流的方向。

　　微机械加工采用标准CMOS工艺技术的变化，在硅中构建物理结构而不是电子结构。这些可以在加速度计和陀螺仪麦克风或运动传感器膜片的设计不同，利用老旧的工厂，成本更有效。

　　Using CMOS technology also allows standard interfaces to be implemented on the same silicon， increasing the integration and reducing both the system power consumption， as there are less chip-to-chip connections， and the overall bill of materials. As the reliability has improved， these factors have driven the technology into the consumer market， particularly in mobile phones. The low profile and surface-mount capability that comes from the MEMS approach means the microphones can be mounted easily anywhere in a design and allows the end equipment to be thinner.

　　These devices are used in high volumes in mobile terminals， laptop and notebook computers as well as voice-over-IP terminals， and digital still and video cameras. Also， they are increasingly being used to provide voice control in gaming and virtual-reality input devices and even for industrial systems， as well as noise cancellation and even antitheft systems.