Loudspeaker Echo
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Loudspeaker Microphone Processing Result
OpenSynergy’s Voice Software Development Kit (Voice SDK) provides high quality audio signal processing to improve in-car speech recognition and hands-free telephony. It comprises noise reduction, full-duplex echo cancelling and optional dual microphone array-technology for directional microphony.
Benefits
• Worksoutofthebox
• Independenceofspeechrecognitionsoftware
• EasyintegrationwithLinuxandAndroidOS
• Simultanousapplicationofvoicerecog-nition,hands-freetelephonyandin-carcommunication
• Flexiblenoisereductionandsignaloutputdependingonusecase
• Excellentsupport
Technical Benefits
• Hardwareindependent
• IndependentofDigitalSignalProcessor(DSP)
• VeryefficientuseofDSP,ifavailableonHW
• Optimizedcodewithsmallfootprint
• Minimumtuningrequirements
• Fullparameteraccessforsystemconfigu-ration
• Widebandandultrawidebandapplications
Main Features
• Noise reduction–Singlemicrophonenoisereduction
• Acoustic Echo Cancelling -Fullduplextechnology
• Array technology–Directionalmicrophony
• Library for echo cancelation & noise reduction
• Audio sampling rates up to 24 KHz
Use Cases
• Hands-free voice application
• Speech recognition
• Enhanced voice quality connection in noisy environments
• Bluetooth or wire-based phone support
OpenSynergy,COQOSSDK,BlueSDK,IrDASDK,VoiceSDK,UpdateSDK,Qonformat,andotherOpenSynergyproductsandservicesmentionedhereinaswellastheirrespectivelogosaretrademarksorregisteredtrademarksofOpenSynergyGmbHinGermanyandinothercountriesaroundtheworld.Allotherproductandservicenamesinthisdocumentarethetrademarksoftheirrespectivecompanies.Thesematerialsaresubjecttochangewithoutnotice.ThesematerialsareprovidedbyOpenSynergyGmbHforinformationalpurposesonly,withoutrepresentationorwarrantyofanykindandOpenSynergyGmbHshallnotbeliableforerrorsoromissionswithrespecttothematerials.©OpenSynergyGmbH2016
Head Unit BluetoothTxRx
either/or
Phone
electricalacous�cradio
Echo
Voice
Noise
Datasheet - Voice SDK
AudioSignalFlowofanInfotainmentSystem
Key Facts:• Full-duplexechocancelling,Echo
ReturnLossEnhancement(ERLE)>45dB,Category1ofITU-TP.340,compliantwithVDA1.6
• Singlemicrophonenoisereductionupto20dB(tuneable)
• Optionaldualmicrophonearraytechnologyforacousticfocusontheuser
• Supportof8kHzupto24kHzaudiosamplingrate
Acoustic Echo CancellingAcousticEchoCancelling(AEC)isoneofthekey components of Voice SDK. It is an ext-remely robust solution realizing full-duplexcommunication inawidevarietyofuseca-ses. It enables a VDA-compliant hands-freesystemwith an Echo Return Loss Enhance-ment (ERLE) of at least 45 dB. Fully linearecho cancelling is combinedwith non line-ar processing (residual echo suspression),maintainingfull-duplexoperationtothegre-atestpossibleextent.
Single Microphone Noise ReductionNoiseReduction(NR) is thesecondcoreal-gorithm of an automotive hands-free SDK.With only one microphone, NR is capableofattenuatingstationaryor slowlymodula-tingnoise componentsup to20dB. This isachieved by a proprietary algorithm,whichis capable of distinguishing between voicecomponents and slowly modulating noisecomponents,whicharetypicalforautomoti-vehands-freeapplications.ThelevelofnoiseattenuationindBisatuneableparameter.
Array TechnologyWithtwomicrophones,noisereductioncanbe furtherenhanced compared toa single-microphonesolution.Thesecondmicropho-neprovidesspatialinformationaboutsitua-tions of both voice signal and disturbances
that come from different directions. As aresult also non-stationary disturbances likeinterferingvoicescanbeefficientlyreduced.OpenSynergyoffersdifferent variantsof ar-ray technologies for different microphonespacings andmicrophone types (conventio-nalcardioidECMsormodernMEMSmicro-phones).
Additional Components of Signal Processing• Equalizers(receive(Rx)andtransmit
(Tx))cancompensateacousticeffectsofvehicleinterior
• Dynamicrangecompressionincreasestheloudnessofspeechandavoidsovermodulation(clippingprotection)
• AutomaticGainControl(AGC)adjuststhemicrophongainfordifferentloudnessofuservoices
• Noisedependentvolumecontrolincreasesloudspeakeroutputwhentheenvironmentalnoiselevelgrows.
DeliveryVoiceSDKcomeswithexcellentsupport,andaccess to product updates. OpenSynergy isabletotestthecustomer’ssystemdesignbe-foreprovidingthelibrary.Acompletecheckoftheaudioloop,andpreconfigurationcanbemadeavailable.PCbasedtuningtoolsareprovided.EngineeringServicesareavailableto port Voice SDK to the customer’s hard-wareor tohelp in configurationor integra-tiontasks.
Contact
OpenSynergy GmbHOlafSchmidtDirectorBusinessDevelopmentRotherstraße20D-10245BerlinGermanyE-Mail:[email protected]:+4930/6098540-0
OpenSynergy GmbHRudiLatuskeDirectorSalesBluetoothandSalesManagerSouthStarnbergerStr.2282131Gauting / MünchenGermany E-Mail: [email protected]: + 49 89 8934 13-33web: www.opensynergy.com
OpenSynergy, Inc.(USA) BretonBuckleyBusinessDevelopmentManager,North-America765East340SouthSuite106AmericanFork,Utah84003USAE-Mail: [email protected]: +16199621725Web: www.opensynergy.com
December,2015
OpenSynergy,COQOSSDK,BlueSDK,IrDASDK,VoiceSDK,UpdateSDK,Qonformat,andotherOpenSynergyproductsandservicesmentionedhereinaswellastheirrespectivelogosaretrademarksorregisteredtrademarksofOpenSynergyGmbHinGermanyandinothercountriesaroundtheworld.Allotherproductandservicenamesinthisdocumentarethetrademarksoftheirrespectivecompanies.Thesematerialsaresubjecttochangewithoutnotice.ThesematerialsareprovidedbyOpenSynergyGmbHforinformationalpurposesonly,withoutrepresentationorwarrantyofanykindandOpenSynergyGmbHshallnotbeliableforerrorsoromissionswithrespecttothematerials.©OpenSynergyGmbH2016
Datasheet - Voice SDK
2-Mic-Array
ResidualEcho
AGC /compressor EQ
Tx
Rx
Linear Echo
Noise-Reduct.
EQ
Mandatory
Op�onal
LevelControl
TuningLink
Noise-DependentVolume Control
BuildingBlocksofVoiceSDK
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