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FP410 PORTABLE AUT OMAT IC MIXER
The Shure Model FP410 is an automatic microphone mixer
designed foruse ina wide variety ofmulti-microphonespeech
pickup applications. Shure IntelliMix delivers flawless auto-
matic mixing by combining three unique functions:
Noise--Adaptive Threshold,
MaxBus, and
Last Mic Lock-- On.
Noise --AdaptiveThresholddistinguishes betweenconstant
background noise (such as air conditioning) and rapidly
changing sound (such as speech).This function continuously
adjusts the activation threshold so that only speech levels
louder than the background sound will activate an FP410
channel.
MaxBus eliminates the poor audio quality that results when
a talker ispicked upby more thanonemicrophone. Itdoesthis
bycontrollingthenumber ofmicrophonesthatmay activatefor
a single sound source. With MaxBus, one talker will activate
only one FP410 channel, even if multiple microphones are
“hearing” that talker.
LastMicLock--Onmaintains aseamlessaudiomix bykeep-
ing the most recentlyactivated microphone open until anewly
activated microphone takes its place. Without Last Mic Lock --
On,along pauseinconversationmayallowallmicrophonesto
turn off, and it may sound as if the audio signal has been lost.
Last Mic Lock--On ensures that background ambience will al-
ways be present.
Multiple miking situations—with a number of talkers partici-
pating—havealwayspresentedproblemsfortheaudiotechni-
cian. Iftoo few mics areused, thecoverage ofeach talkermay
vary,withone talker(nearestthemic) beinglouderand clearer
than the next. Talkers farthest from the mics will sound
“echoey”andreverberant,asverylittleofthedirectsoundfrom
their mouths reaches the microphones. If too many mics are
used, there’s more background noise and reverberation pick-
up, as well as less gain before feedback if a sound reinforce-
ment (PA) system is used.
It’s somewhat like having multiple video cameras all fo-
cused on the same subject. If these camera signal are com-
bined, the result is a blurred image. When multiple micro-
phonesareopen forasingletalker,theresultisa blurredaudio
signal. But it’s often not practical for someone to turn mics on
when they are needed and off when they are not. The answer
is the FP410 automatic microphone mixer.
The FP410 automatically attenuates (turns down) any mi-
crophone not being used, greatly reducing the excess rever-
beration and feedback problems associated with the use of
conventional multiple microphone and mixer techniques.
When anew talkerstarts tospeak, the FP410immediately se-
lects and silently activates the most appropriate microphone.
Shure IntelliMix electronic signal processing enables the
FP410 to provide clear, natural voice pickup. The FP410 sig-
nificantly reduces theproblems of “boomy”or “muddy”s ound,
insufficient sound level (because of feedback or “howling”),
and operator errors. In fact, operator errors are virtually elimi-
nated because the FP410 needs no operatoror technician for
continual adjustment—once set up, it is completely self --suffi-
cient.
The FP410 has numerous applications in video production
and audio recording, broadcasting, and soundreinforcement.
In anyspeech pickupapplication where multiple microphones
are required, the FP410 dramatically improves audio quality.
Switching from manual to automatic operation allows an indi-
vidual talker’s voice to rise above the background noise and
reverberation to become clearer and more intelligible.
Each FP410 handles up to four microphones or line--level
signals. Any high quality, low--impedance, balanced micro-
phone using a dynamic or condenser* transducer (including
wireless and shotgun types) can be used. Additional FP410
mixers can be interconnected using the rear--panel link jacks.
Completemanualoperationis alsoavailable usingafront--pa-
nel selector switch.
The FP410 is supplied with optional bumpers (feet) for use
onhorizontalsurfaces,ashortcableforlinkingtwoFP410mix-
ers, and a rack--mounting kit for installation in a standard 483
mm (19--inch) audio equipment rack.
TheFP410(100to120Vacoperation;linefuse0.1A) isalso
supplied as the Model FP410E (230 Vac operation; line fuse
0.05 A), and its line cord contains a Schuko ac plug.
*Self--powered or operable on 14 or 48 Vdc phantom power.
Features
Reliable,quick--acting,noise-- free microphone selection----
automaticallyadjusts tochangesin backgroundroomnoise
Front--panelchannel gainandmastercontrols operateasin
conventional mixers
Selectable hold time keeps microphones on during short
pauses in speech
Shure Inc orporated
222 Hartre y Avenue
Evanston IL 60202-3696 U.S.A.
Model F P410 User Guide
27B8392 (TB)
E2000, Shure Incorporated
PrintedinU.S.A.
U.S. Patent 4,658,425; otherpatents pending