OnSemiRhythmSB3231BTE1.0助听器参考设计OnSemi公司的RhythmSB3231是可配置的DSP系统,具有四路自适应反馈抵消的压缩电路,自适应降噪和FrontWave®静态方向性,I2C和SDA编程,模拟或数字音量控制,高质量200位音频处理和高保真CODEC,大功率/高增益功能,16kHz或8kHz带宽.本文介绍了Rhythm™SB3231主要特性,框图,测试电路图,典型可编程和调整应用电路图,以及BTE1.0助听器参考设计主要特性和主要指标,BTE助听器电路框图和主要元件图.Rhythm™SB3231isatrimmer-configurableDSPsystembasedonafour-channelcompressioncircuitfeaturingAdaptiveFeedbackCancellation,AdaptiveNoiseReduction,andFrontWave®staticdirectionality.Basedonaphasecancellationmethod,RhythmSB3231’sadaptivefeedbackreductionalgorithmprovidesaddedstablegaintoenableextragainandusercomfort.Itfeaturesrapidadjustmentfordynamicfeedbacksituationsandresistancetotonalinputs.TheFrontWavedirectionalsystemutilizesapairofmicrophonestocreateafullycustomizablestaticpolarpattern,suchasbidirectional,cardiod,hyper-cardiodandsuper-cardiod.Inadditiontotheseadaptivealgorithms,RhythmSB3231alsosupportsthefollowingfeatures:uptofourchannelWDRC,low-distortioncompressionlimiting,crossfadingbetweenaudiopathsforclick-freememorychanges,eight-bandgraphicequalizer,eightconfigurablegenericbiquadfilters,programmingspeedenhancements,in-channelsquelchtoattenuatemicrophoneandcircuitnoiseinquietenvironments,optionalpeakclipping,flexiblecompressionadjustments,volumecontrol,rockerswitch,noisegenerationfortinnitustreatment,andindustryleadingsecurityfeaturestoavoidcloningandsoftwarepiracy.SoftwareSupportARKisasetofsoftwarebuildingblocksthatcanhelpreducethetimeittakestodevelophearingaidfittingsoftware.ARKonline®isanefficientweb-basedtoolforcreatingproductlibrariesandkeepingthemorganized.Rhythm™SB3231主要特性:FrontWaveDirectionalityAdaptivenoisereductionAdaptivefeedbackcancellationWDRCcompressionwithchoiceof1,2or4channelsofcompressionAutotelecoilwithprogrammabledelayEVOKELite™acousticindicatorsNoisegeneratorfortinnitustreatmentorin-situaudiometryFrequencyresponseshapingwithgraphicEQTrimmercompatibility-fourthree-terminaltrimmerswithconfigurableassignmentsofcontrolparametersI²CandSDAprogrammingRockerswitchsupportformemorychangeand/orvolumecontroladjustmentAnalogordigitalvolumecontrolwithprogrammablerangeHighquality20-bitaudioprocessingHighpower/highgaincapabilitySOUNDFIT®fittingsoftwareConfigurablelowbatteryindicator8biquadraticfilters16kHzor8kHzbandwidth4fullyconfigurablememorieswithaudiblememorychangeindicator96dBinputdynamicrangewithHRX™HeadroomExtension128-bitfingerprintsecuritysystemandothersecurityfeaturestoprotectagainstdevicecloningandsoftwarepiracyHighfidelityaudioCODECSoftacousticfadebetweenmemorychangesDriveszero-biastwo-terminalreceiversE1RoHScomplianthybrid图1.RhythmSB3231框图图2.RhythmSB3231测试电路图图3.RhythmSB3231典型可编程应用电路图图4.RhythmSB3231典型调整应用电路图BTE1.0助听器参考设计TheBTE1.0ReferenceDesignisahardwarereferencedesignforaBehind-The-Ear(BTE)hearingaidusingtheRhythmSB3231preconfiguredDSPsystem.ItcontainsasingleSB3231devicewhichenablesimplementationofacompletedigitalhearingaidwithstate-of-the-artfeaturesandspecifications.ThisreferencedesignassumesthattheBTEwillbeassembledusingpoint-to-pointwiringofthecomponents.Therefore,nodescriptionofaPCBdesignisgiven.AflexPCBimplementationisapreferredcomponentinterconnectmethodforlargeproductionvolumes,butisbeyondthescopeofth...
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