Sennheiser SpeechLine Instruction Manual download pdf (Page 7)

Sennheiser SpeechLine – True the word

6 | SpeechLine IS microphone series

Pick-up patterns of the microphones

Omni-directional pick-up pattern

Cardioid pick-up pattern

Super-cardioid pick-up pattern

Hyper-cardioid | lobar pick-up pattern

Positioning the microphones

A) Distance from the speaker

Basically, the nearer a speaker is to the microphone, the higher the speech

intel

ligibility. For this reason, gooseneck microphones are optimal from an

acoustic point of view. They position the microphone capsule close to the

speaker while offering excellent orientation.

Boundary layer microphones do not achieve the excellent acoustic

characteristics of gooseneck microphones, but they can be positioned

especially unobtrusively. These microphones can be integrated into any

room due to their small size and the colors they are available in. As a result

of the so-called boundary layer effect, the signal picked up by the

microphone capsule is amplified on a surface (for example a table or a

ceiling panel). In this way, part of the distance to the speaker can be

compensated for again.

B) One microphone for each speaker

In the ideal case, a dedicated microphone is used for each speake

r. This

allows the best possible orientation and distance to the speaker to be

ensured at all times. It is also possible to choose a narrower directional

characteristic. This allows noise coming from the side as well as acoustic

reflections to be minimized, resulting in the highest speech intelligibility.

C) “Shared microphones” - several sp

eakers share one microphone

One microphone per speaker is ideal, but

one microphone shared by two

speakers is often adequate for many applications. A microphone with a

sufficiently wide opening angle should be selected here. The microphone

can thus pick up both speakers if installed centrally before them.

MEB 102-L

MEB 102

An omni-directional pattern picks up the sound uniformly from all

directions.

MEB 104-L

MEB 104

MEG 14-40L

MEG 14-40

ME 34

A cardioid pattern has a wide directional characteristic, i.e. a wide

opening angle. Sound hitting the rear of the microphone is

filtered out completely.

ME 35

A super-cardioid pattern has a slightly stronger directional

characteristic than the cardioid pattern, so it suppresses noise

coming from the side even more strongly but also picks up some

of the sound coming from the rear.

ME 36

A hyper-cardioid or lobar pattern has the strongest directional

characteristic, i.e. it provides the maximum suppression of sound

coming from the side, but it also picks up sound coming from the

rear. However, the ratio is lower than it is with the super-cardioid

pattern.

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Sennheiser SpeechLine Instruction Manual Page 7

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