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USM-69 / 钮曼 Neumann 多方向立体声录音话筒
类别：录音话筒
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详细介绍：
其在外观上和先前该公司前不久推出的bcm 104话筒一模一样，但是从其新添的“绿色”neumann标牌上，用户还是可以立即辨认出这是一款neumann动圈话筒。
为了加强低频响应，设计人员有意扩大了bcm 705振膜舱周围的空间，并将其同话筒的后输入端口进行了连接。尽管bcm 705是专门为近距离扩音设计的，但是，由于临近效应，还是会产生少许的低频效果，这使得该款话筒成为那些喜欢同话筒保持一定距离，但又希望能够产生优质、坚实低频响应的音乐人士的理想选择。
此外，bcm 705还采用了kms 105和bcm 104话筒所使用的金属丝网防“噗”罩，从而避免了像md 431那样在振膜舱前面添加一层泡沫。该防“噗”罩可以被卸下进行清洗，无需使用任何工具。其所配备的防风罩也在bcm 104基础上进行了一定的改进。
USM 69立体声麦克风有两个独立的双膜片胶囊。这些都是垂直安装和旋转互相攻击。定向拾音模式可以选择分别为每胶囊。这些胶囊彼此独立运作。
应用
USM 69立体声电容话筒是一种强度立体声录音室麦克风。它是用于XY和MS录音合适。
建设
麦克风放大器组成部分和胶囊头.该放大器部分包含两个麦克风放大器经营相互独立。他们有一个非常低自我噪音。
两个完全独立的麦克风胶囊定位高于对方头部的胶囊内密切合作。他们的隔膜曾用金溅射聚酯薄膜。反对超过270 °范围内降低一个大写胶囊旋转。在较低的胶囊系统颜色标记有助于确定其中的角度上胶囊被旋转。
当声波到达不同方向的麦克风胶囊，他们会产生不同强度的音频信号而已，但不随时间的不同，因为胶囊靠近并且在两个声音同时到达胶囊。其结果是一个强度立体声信号，可以概括为优秀单声道兼容在一起，而不会造成干扰。
拾音模式
USM 69有两个内置的旋转开关。五极格局都胶囊可以选择在麦克风本身。因此，没有特别的交流电源适配器供电单位或者是必要的。
两个输出直接连接到任何48伏幻象供电的连接器。
除了通常的极性模式：全向，心形，图- 8，我们增加了hypercardioid和广角心形图案。
内置DC转换器中生成所需要的胶囊偏光电压。
电气特性
该放大器具有高输出能力和极低的自噪声。远处传来的声音来源，以及在近距离很响亮的声源，因此可以记录没有任何问题。
每个放大器都有一个有源滤波器。它能有效地抑制干扰，由亚音速风或结构噪声引起的。同时，通过过滤器防止超载极低频能量输出变压器。
用作单声道麦克风
麦克风也可以作为完全独立的单声道麦克风。有许多应用程序时，重要的是要有一个作为备份第二单声道麦克风，或当不同极性响应特性的麦克风输出必须同时提供。
两个麦克风通道的输出可以被连接（级联）。除个别方向图等特点，是通过组合现有的两个通道。
操作安全
两个麦克风系统的运作完全相互独立。
第二个放大器将受到影响，即使在与供电电压的一个渠道，或在一个输出短路接地故障的情况。
在单声道麦克风是使用可靠的，即使只是其中一个系统操作和连接。它的简单和多余的电路，保证了低故障率。
如果DC转换器不断失败，麦克风内的二极管电路确保两个系统将继续运行。心形图案的自动选择。.其灵敏度降低3分贝。
切换立体声麦克风
两个压力梯度传感器双膜胶囊
MS -或XY -立体声
胶囊270 °旋转
噪音极低
光圈和接机的角度自由可选择的
8方向特性reproducably切换，全方位，宽角度心形，心形，hypercardioid
声学工作原理 压力梯度传感器
直接有理模式 8全方位，宽角度心形，心形，hypercardioid，图- 8
频率范围 20 Hz ... 20 kHz
灵敏度为1 kHz的1千欧 13 mV/Pa
额定阻抗 150 ohms
额定负载阻抗 1 kohms
等效噪声级，CCIR 1） 24 dB
等效噪声级，A权重1） 13 dB-A
讯噪比，CCIR 1）（rel. 94分贝声压级） 70 dB
讯噪比，A加权1）（rel. 94分贝声压级） 81 dB
Maximum SPL for THD 0.5% 2)dB 119分贝
电源电压（P48，符合IEC 61938） 48 V ± 4 V
电流消耗（P48，符合IEC 61938） 2 x 0.7 mA
匹配的连接器 XLR5F
重量 510 g
直径 30 + 48 mm
长 293 mm
The USM 69 i stereo microphone has two separate dual-diaphragm capsules. These are mounted vertically and rotate against each other. The directional polar patterns can be selected separately for each capsule. The capsules operate independently from each other.
Applications
The USM 69 i condenser stereo microphone is a studio microphone for intensity stereo recording. It is suitable for XY and MS recordings.
Construction
The microphone consists of the amplifier section and the capsule head. The amplifier section contains two microphone amplifiers operating independently from each other. They have an extremely low self noise.
Two completely separate microphone capsules are positioned closely above each other within the capsule head. Their diaphragms are made out of gold-sputtered polyester film. The upper capsule rotates against the lower one over a range of 270°. Color markings on the lower capsule system help to identify the angle by which the upper capsule has been rotated.
When sound waves reach the microphone capsules from different directions they will generate audio signals with different intensity only, but not with time differences, since the capsules are in close proximity and the sound arrives at both capsules simultaneously. The result is an intensity stereo signal that can be summed together for excellent mono compatibility without causing interference.
Polar patterns
The USM 69 i has two built-in rotary switches. The five polar patterns of both capsules can be selected at the microphone itself. Therefore, no special AC power supply units or powering adapters are necessary.
The two outputs attach directly to any 48 V phantom powered connectors.
In addition to the usual polar patterns: omnidirectional, cardioid, and figure-8, we have added a hypercardioid and a wide-angle cardioid pattern.
A built-in DC converter generates the required capsule polarizing voltages.
Electrical features
The amplifiers feature high output capability and extremely low self noise. Distant sound sources, as well as very loud sound sources at close range can therefore be recorded without any problem.
Each amplifier has an active filter. It effectively suppresses subsonic interference as caused by wind or structure borne noise. At the same time, the filter prevents the output transformers from overloading through very low frequency energy.
Use as a mono microphone
The microphones may also be used as completely independent mono microphones. There are many applications when it is important to have a second mono microphone as a backup, or when the outputs of microphones with different polar response characteristics must be available simultaneously.
The outputs of the two microphone channels can be linked (cascaded). In addition to the individual directional patterns, other characteristics are available through the combination of both channels.
Operational safety
Both microphone systems operate completely independent from each other.
The second amplifier will be unaffected, even in case of a faulty ground of the supply voltage for one of the channels, or a short circuit in one of the outputs.
The microphone is reliable in mono usage, even if only one of the systems is operated and connected. Its simple and redundant circuitry guarantees a low failure rate.
Should the DC converter ever fail, a diode circuit within the microphone ensures that both systems will remain operational. The cardioid pattern is automatically chosen. The sensitivity is reduced by 3 dB
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