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KMR-81i / 钮曼 Neumann 强指向话筒(采访)
类别：强指向话筒(采访)
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详细介绍：
它的优点是一个声源，例如一个演员在舞台上，将不会改变其明显的音调平衡时，在这个领域的行动。
应用
猎枪，特别是在录音话筒麦克风凡不能在声源之间的距离来产生足够响亮的信号电平的情况下非常有用。
典型的应用是电影和录像，其中的麦克风不应该出现在画面。
T该KMR 81是专门设计的电子新闻采集。
声学特征
原则上，纽曼话筒猎枪使用的一个压力传感器和干扰梯度管的组合。如果该频率的波长比管长度较长，麦克风的工作压力梯度传感器。 他们工作在更高频率的声波干扰横向传感器。离轴声音来源是拿起了较低水平，但不着色。
因此，非常适合麦克风，记录了乐团的乐器。几个猎枪麦克风拾音地区甚至可能重叠，例如，在一个大舞台上的录音，而不会造成任何问题。
81的KMR不太敏感的风和流行时的噪音比150公里一个类似的高指向性微型麦克风。猎枪麦克风功能极低的自噪声，良好的脉冲响应和高输出水平。
拾音模式
麦克风胶囊是定位在一个房屋管，声学开放，但具有较高的流动阻力。麦克风的方向图是瓣形。声音衰减，对侧向的频率几乎是独立的。有一个81的KMR在90该计划确定材料的音调平衡音频信号°拾音角频率无关的方向性。
滤波器和衰减
麦克风具有10 dB的衰减开关，以防止超载以下单位的投入。
第二个开关激活了200 Hz高通滤波器。 向低频率的麦克风灵敏度衰减约15分贝50赫兹。上述200赫兹的频率范围不受影响。
使用上的位置
猎枪麦克风具有非常高的输出能力和非常低的自噪声水平。
它具有低功耗，重量轻，灵敏度低噪声风和处理，使得它在现场采集的新闻理想工具。
体积小，重心与平衡的中心一起，使操作简单无需任何鞭梢效应。
How但是，当位置和在强风条件下，我们建议使用一个额外的风幕（包括作为标准附件）。风幕是由聚氨酯泡沫，并服务于它的手提箱皮革作为麦克风软填充。
用于移动应用的一个句柄和一个弹性悬挂可用。
干扰特性定向麦克风管猎枪
I干扰/压力梯度传感器
高侧和背面衰减
90 °角记录
切换功能，过滤器或preattenuation
户外使用广泛的附件
重量轻：145克
声学工作原理 干扰传感器
定向模式 超心/叶
频率范围 20 Hz ... 20 kHz
灵敏度为1 kHz的1千欧 18 mV/Pa
额定阻抗 150 ohms 150欧姆
额定负载阻抗 1 kohms 1千欧
等效噪声级，CCIR 1） 23 dB二三分贝
等效噪声级，A权重1） 12 dB-A 12分贝，阿
讯噪比，CCIR 1）（rel. 94分贝声压级） 71 dB 71分贝
讯噪比，A加权1）（rel. 94分贝声压级） 82 dB
最大声压级的总谐波失真0.5％2） 128 dB
总谐波失真0.5最大声压级为2％preattenuation） 138 dB
最大输出电压 1.3 dBu 1.3 dBu的
动态范围的麦克风放大器（A加权） 116 dB
电源电压（P48，符合IEC 61938） 48 V ± 4 V 48伏± 4五号
电流消耗（P48，符合IEC 61938） 0.8 mA 0.8毫安
匹配的连接器 XLR3F
直径 21 mm
长 226 mm
The KMR 81 is a shotgun microphone with a high directivity that remains within the acceptance angle independent of the frequency.
The advantage is that a sound source, for example an actor on stage, will not change its apparent tonal balance when moving within this area.
Applications
Shotgun microphones are particularly useful in recording situations where a microphone cannot be positioned within the desired distance of the sound source to produce a sufficiently loud signal level.
Typical applications are film and video recordings, where the microphone should not appear in the picture.
The KMR 81 has been specifically designed for electronic news gathering.
Acoustic features
In principle, Neumann shotgun microphones use a combination of a pressure gradient transducer and an interference tube. If the wavelength of the frequency is longer than the tube length, the microphones work as pressure gradient transducers. At higher frequencies they operate as interference transducers for lateral sound. Off-axis sound sources are picked up with reduced level, but without coloration.
Therefore, the microphones are well suited to record individual instruments of an orchestra. The pickup areas of several shotgun microphones may even overlap as, for example, during recordings on a large stage, without causing any problem.
The KMR 81 is less sensitive to wind and pop noise when compared to the KM 150 miniature microphone with a similar high directivity. The shotgun microphone features extremely low self noise, good impulse response, and high output level.
Polar patterns
The KMR 81 is a shotgun microphones with a very directional characteristic.
The microphone capsule is positioned inside a housing tube that is acoustically open but has a high flow resistance. The directional pattern of the microphone is lobe shaped. The attenuation of lateral sound is practically independent of the frequency. The KMR 81 has a frequency independent directivity within a pickup angle of 90° for audio signals that determine the tonal balance of the program material.
Filter and attenuation
The microphone has a 10 dB attenuation switch to prevent the input of the following unit from overloading.
A second switch activates a 200 Hz high-pass filter. Toward the lower frequencies the sensitivity of the microphone is attenuated by approximately 15 dB at 50 Hz. The frequency range above 200 Hz is unaffected.
Use on location
The shotgun microphone features very high output capability and a remarkably low self-noise level.
Its low power consumption, light weight, and low sensitivity to wind and handling noise, makes it an ideal tools for news gathering on location.
Small dimensions, together with a balanced center of gravity, make handling easy without any whiplash effect.
However, when on location and during strong wind conditions, we recommend using an additional wind screen (included as standard accessory). The wind screen is made of polyurethane foam and also serves as soft padding of the microphone in its leather carrying case.
For mobile use a handle and an elastic suspension are available
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