Linear array microphone KEM 975

measurementcapacitorcardioid

The cardioid plane mic KEM 975 is a line array microphone system with a largely frequency-independent polar pattern, which – in the horizontal plane – has the features of a cardioid mic and – in the vertical plane – the features of a directional mic with an operating angle of approx. 30 degrees. Thus, the polar pattern is adapted to the frequent case that the sound source to be captured is wide in space or moves around in it and at the same time, sound coming from other directions is to be suppressed. The sound to be rejected may consist of disturbing noises or reflections from ceiling, table surfaces or floor areas. Due to its directional characteristics, it can be used for recording very extensive in width sound sources, depth or moving. Since the complete analogue signal processing there are no signal delays. Delta capsule Below approx. 800Hz, the mic cannot maintain its clubbed directivity in the vertical plane anymore due to its length and approaches a cardioid polar pattern more and more with decreasing frequency. With a optional Delta capsule (developed with the Institute for Broadcasting Technology), the directivity and directionality are increased in this frequency range which forms an equilateral triangle together with the 2 outermost capsules. Thus, a frequency-constant directivity index is realised across the entire range down to 100Hz. The result is a better spatial separation of sound sources with low-frequency signal portions and a more consistent spaciousness in the recorded signal over the frequency spectrum, particularly advantageous for music recordings. For video conferences, or as a speaker’s mic, it can be used without the Delta capsule.