Panasonic HDC-HS100 Operating Instructions Manual page 54

Function
Microphone setup
[SURROUND]:
Sound is recorded with
5.1 ch surround microphone.
[ZOOM MIC]:
Directivity of the microphone
is interlocked with the zoom
operation. Sounds near the
front of the unit are recorded
more clearly if you zoom in
(close-up) and surrounding
sounds are recorded more
realistically if you zoom out
(wide angle).
[FOCUS MIC]:
Directivity of the centre is
enhanced for recording audio
near the front of the unit
more clearly.
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Effect/Setting method
Directivity (sound sensitivity direction) of the built-in
microphones can be adjusted.
Select the menu. (F 24)
[RECORD SETUP] [MIC SETUP]
This function's default setting is [SURROUND].
desired setting