Datasheet

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Figure 21 The cardioid (left) and omnidirectional (right) pick-up patterns [41]
Due to the pick-up pattern of the cardioid microphone it is commonly used as a general
microphone, such as used for vocals or speech, while on the other hand the omni-
directional microphone picks up sound from every direction, such as ambient noise.
Due to pattern the microphone needs to be fixed into position while the sound source
can be moving, but in this instance it is being used to pick up the audio from the stu-
dents while they address the lecturer. Unfortunately due to the style of the microphone,
as it picks up ambient noise, the subject of sound may be drowned out by other noises,
and is something that is definitely needed to be taken into consideration when figuring
out what kind of system is most efficient in the desired case. [42]
Figure 22 shows the ConnectPro solution in action at Metropolia’s Boulevardi campus,
with the cardioid microphone. In the image the camera and audio settings have been
set and the lecturer can be seen in the small camera feed window. The setting up pro-
cess of the Adobe ConnectPro solution took around 3 hours and was rather straight
forward, with the exception of not having enough USB-ports available in the PC, so an
external USB-hub was procured, which added about 20 more minutes to the whole
build-time. Due to the rooms restrictions the omni-directional microphone was placed
onto a window ledge approximately in the middle of the room, to the left-hand side of
the podium. This was done to maximise the amount of sound being picked-up by the
microphone, since it could not be placed directly in the middle of the room. The camera
was positioned to side and slightly behind the computer screen for optimal viewing an-
gle of both the presenter and the screen behind them, and although as can be seen in
Figure 22, the cardioid microphone was placed on the table right in front of the pre-