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Austriamicrosystems AS3400单路情形噪音扫除(ANC)处置赏罚赏罚妄图

宣布时间:2012年01月30日 14:01    宣布者:1770309616
要害词: AS3400 , Austriamicrosystems , 情形噪音
Austriamicrosystems公司的AS3400/10/30集成了情形噪音扫除(ANC)功效的扬声器镌汰年夜器,能降低本底情形噪音,前进了手持装备,耳机,语音通讯装备等的音频质量。ANC处置赏罚赏罚的带宽10Hz~2000Hz,噪音降低10dB-30dB,主要用于耳机,手持装备,手机,免提卡和语音通讯装备。

AS3400/10/30扬声器驱动用具有手机、耳机的情形降噪功效。它的目的是,经由历程增添配景情形噪音,提高声响质量,例如,听音乐、德律风攀谈时。

其全方位的模拟,使功耗降低,系统BOM资源也降低,具有自然的语音增强。这在DSP的情形中是难能名贵的。该器件的设计公正,可以很容易地应用到现有的架构上。
20120612165411557.jpg
图1 AS3400反映方框图

其外部的OTP-ROM可以凭证须要,用来存放麦克风增益校准设置。

AS3400/10/30可以用在不合的装备中,以协调噪音扫除,过滤功效,和结构设计。该设计接纳了质朴的,前馈拓扑结构,有用地增添了低频配景噪声。其反映拓扑和1或2个过滤级,可用于较年夜的频率规模,以增添噪声,以致可以实验传输功效,如,扬声器平衡,Baxandall平衡,高/低弃置过滤,和设置一个预界说的环路带宽。经由历程特定尺寸的,质朴的R,C元件,用户优化了过滤器回路,以用于特定的手机和结构设计。

20120612165411931.jpg
图2 AS3430反映应用案例电路图

年夜多数手机完成将一个单一的噪音检测麦克风的应用。两个麦克风,可以用来让手机机械设计的无邪性,增添他们的职位。应用桥接形式,允许以致推动高阻抗耳机。

AS3400/10/30主要特点

•麦克风输入

– 128增益法式模范@0.375dB,静音,带有AGC

–差分,低噪音的麦克风镌汰年夜器

–单端或差分形式

–极体传声器刷新电源

–麦克风增益OTP编程

–高效力的耳机镌汰年夜器

– 2×34mW,0.1%THD@16Ω,1.5V电源

–100dB信噪比

–桥接形式,例如300Ω负载

–点击和弹出下启动,形式切换

•线路输入

–经由历程串行接口或针脚的音量控制

– 64法式模范@0.75dB和静音,弹出的增益设置

–单止平面声或单声道差分形式

• ANC处置赏罚赏罚

–向前撤消

–反映撤消滤波器环路转达函数,经由历程质朴的RC组件可界说

–临盆,软件校准质朴

–12db~30dB的降噪(耳麦依附)

–10Hz~2000Hz宽频有源噪声衰减(依附于耳机)

•监视功效

–赞助的听证,即监测

–结实(OTPPROG),周围的声响镌汰年夜,以填补耳机自动衰减

–音量控制情形扩声与结实混淆(OTP PROG)衰减LINEIN

•增量功效

–在吸收蹊径上有或没有音乐的ANC

–刷新的静态规模播放

–在临盆历程当中OTP ROM的自动微调(4倍可编程)

•性能参数

– 5/3.8mA@1.5V stereo/mono

ANC; <1μA 静态

– 217Hz扩年夜PSRR
20120612165411960.jpg
图3 AS3430差分正馈应用案例电路

•接口

– 2线串行控制形式及音量输入

–经由历程Line-In或2线串行接口校准

(专利请求中)

–单电池或结实的1.0V~1.8V电源,外部CP

•封装

– AS3400, AS3410 QFN24 [4mm×4mm] 0.5mm间距

– AS3430 QFN32 [5mm×5mm] 0.5mm间距

AS3400/10/30应用

该装备是耳片、耳机、免提、移动德律风、语音通讯装备的较理想选择。

Austriamicrosystems公司的AS3400/10/30集成了情形噪音扫除(ANC)功效的扬声器镌汰年夜器,能降低本底情形噪音,从而前进了手持装备,耳机,语音通讯装备等的音频质量。ANC处置赏罚赏罚的带宽10-2000Hz,噪音降低10-30dB,主要用于耳机,手持装备,手机,免提卡和语音通讯装备。本文简介了AS3400/10/30主要特点,反映和正馈方框图,反映应用案例电路图与差分正馈应用案例电路图。

The AS3400/10/30 are speaker driver with Ambient Noise Cancelling function for handsets, headphones or ear pieces. It is intended to improve quality of e.g. music listening, a phone conversation etc. by reducing background ambient noise.

The fully analog implementation allows the lowest power consumption, lowest system BOM cost and most natural received voice enhancement otherwise difficult to achieve with DSP implementations. The device is designed to be easily applied to existing architectures.

An internal OTP-ROM can be optionally used to store the microphones gain calibration settings.

The AS3400/10/30 can be used in different configurations for best trade-off of noise cancellation, required filtering functions and mechanical designs.

The simpler feed-forward topology is used to effectively reduce low frequency background noise. The feed-back topology with either 1 or 2 filtering stages can be used to reduce noise for a larger frequency range, and to even implement transfer functions like speaker equalization, Baxandall equalization, high/low shelving filter and to set a predefined loop bandwidth.

The filter loop is optimized by the user for specific handset electrical and mechanical designs by dimensioning simple R, C components. Most handset implementations will make use of a single noise detecting microphone. Two microphones could be used to allow for increased flexibility of their location in the handset mechanical design. Using the bridged mode allows to even drive high impedance headsets.

AS3400/10/30主要特点:

Microphone Input

&#1048708; 128 gain steps @ 0.375dB and MUTE with AGC

&#1048708; Differential, low noise microphone amplifier

&#1048708; Single ended or differential mode

&#1048708; Improved supply for electret microphone

&#1048708; MIC gain OTP programmable

High Efficiency Headphone Amplifier

&#1048708; 2x34mW, 0.1% THD @ 16Ω, 1.5V supply,

100dB SNR

&#1048708; Bridged mode for e.g. 300Ω loads

&#1048708; Click and pop less start-up and mode switching

Line Input

&#1048708; Volume control via serial interface or volume pin

&#1048708; 64 steps @ 0.75dB and MUTE, pop-free gain setting

&#1048708; Single ended stereo or mono differential mode

ANC processing

&#1048708; Feed-forward cancellation

&#1048708; Feed-back cancellation with filter loop transfer function definable via simple RC components

&#1048708; Simple in production SW calibration

&#1048708; 12-30dB noise reduction (headset dependent)

&#1048708; 10-2000Hz wide frequency active noise attenuation (headset dependent)

Monitor Function

&#1048708; For assisted hearing, i.e. to monitor announcements

&#1048708; Fixed (OTP prog.) ambient sound amplification to compensate headphone passive attenuation

&#1048708; Volume controlled ambient sound amplification mixed with fixed (OTP prog.) attenuation of LineIn

Incremental Functions

&#1048708; ANC with or without music on the receiving path

&#1048708; Improved dynamic range playback

&#1048708; OTP ROM for automatic trimming during production (4 times programbable)

Performance Parameter

&#1048708; 5/3.8mA @ 1.5V stereo/mono ANC; <1μA quiescent

&#1048708; Extended PSRR for 217Hz

Interfaces

&#1048708; 2-wire serial control mode & volume inputs

&#1048708; Calibration via Line-In or 2-wire serial interface (patent pending)

&#1048708; Single cell or fixed 1.0-1.8V supply with internal CP

Package

&#1048708; AS3400, AS3410 QFN24 [4x4mm] 0.5mm pitch

&#1048708; AS3430 QFN32 [5.x5mm] 0.5mm pitch

AS3400/10/30应用:

The devices are ideal for Ear pieces, Headsets, Hands-Free Kits, Mobile Phones, and Voice Communicating Devices.
20120130133015349.gif
图1。AS3400反映方框图
20120130133019945.gif
图2。AS3400前馈方框图
20120130133021903.gif
图3。AS3400前馈ANC方框图
20120130133022975.gif
图4。AS3430反映应用案例电路图
20120130133023453.gif
图5。AS3430差分正馈应用案例电路图
概略请见:
AS3400_10_30_Datasheet_EN_v1.pdf (1.5 MB, 下载次数: 15)
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