Lectrosonics SRb_SRb5P User Manual download pdf (Page 7)

UHF Digital Hybrid Wireless

Rio Rancho, NM

The Smart Noise Reduction algorithm has three modes,

selectablefromausersetupscreen.Theoptimalsetting

foreachapplicationissubjectiveandselectedwhile

simplylistening.

• OFFdefeatsnoisereductionandcompletetrans-

parencyispreserved.Allsignalspresentedtothe

transmitter’sanalogfrontend,includinganyfaint

microphonehiss,willbefaithfullyreproducedatthe

receiveroutput.

• NORMALappliesenoughnoisereductiontore-

movemostofthehissfromthemicrophonepreamp

andsomeofthehissfromlavalieremicrophones.

Thenoisereductionbenetissignicantinthis

position,yetthedegreeoftransparencymaintained

isexceptional.

• FULLappliesenoughnoisereductiontoremove

most of the hiss from nearly any signal source of

reasonable quality and some high frequency envi-

ronmentalnoise,assuminglevelsaresetproperly

at the transmitter.

Supersonic Noise-Based

Dynamic Filter and Squelch

InadditiontoSmartNR,allhybridreceiversare

equippedwithasupersonicnoise-baseddynamiclter

and squelch system. The incoming audio is monitored

forenergyabove22kHz,pilottoneexcepted.Excessive

high frequency energy indicates that the received signal

istooweaktoachieveanacceptablesignal-to-noise

ratio.Undermarginalconditions,avariablelowpass

lterisrolledindynamically,maskingthenoisewhile

preservingasmuchofthetransmittedsignalaspos-

sible.Whenthechannelistoonoisyevenforthelter,

the audio is squelched.

Thisnoise-basedlterandsquelchsystemreplacesa

more or less equivalent system used for many years,

whichbaseditsoperationonRFsignalstrength.Perfor-

mance of the two systems is virtually identical, but the

noise-basedsystemrequiresnocalibrationandthere

isnobetterwaytotrackthesignal-to-noiseratiothanto

measure it directly.

Talkback Function

The Talkback function works with the HH hand held

transmittertouseoneoftheoutputchannelsforcom-

municationwithstaffandcrew.Oneoftheaudiooutputs

is connected to the mixer, recorder or house feed. The

otheroutputisconnectedtoa“com”channel.

Whenthetalkbackbuttononthetransmitterispressed,

theaudiooutputonthereceiverisswitchedtothe

oppositeoutputjack.Whenthebuttonisreleased,the

audiooutputtogglesbacktotheoriginaloutputjack.

Turn On and Turn Off Delays

Abriefdelayisappliedwhenthereceiverispoweredup

ordowntopreventaudiblenoisesuchasathump,pop

or other transient noise.

Audio Output Level

Asetupscreenisprovidedforadjustingtheaudioout-

putlevelin1dBincrementsfrom-50to+5dBuusing

thefrontpanelUPandDOWNbuttons.

Test Tone

Toassistinmatchingtheaudiolevelsofequipment

connectedtotheSRb5PorSRb,a1kHzaudiotest

tone,adjustablefrom-50to+5dBuin1dBincrements,

is available at the XLR connector. This tone is available

throughtheTONEsetupwindow.

Power Supply

TheSRb5PandSRbisoperatedfromanexternalDC

powersource.Thepowersuppliesareprotectedfrom

damagetothereceiverthatcouldoccurifapositive

groundpowersourceisapplied.

LCD Display

Thedisplayhasfourprimarywindows.Pressingthe

FrontPanelSELbuttonstepsthrougheachofthese

windows.

Ifabatterygetslowononeofthetransmitters,ames-

sagewillinterruptthedisplayeveryfewsecondsand

ﬂash a low battery warning.

Afterpoweristurnedoffandbackonagain,theunit

defaults to the main window and to the most recent fre-

quency,audiolevel,transmitterbatterytypeandother

user settings.

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Lectrosonics SRb_SRb5P User Manual Page 7

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