TalkBox - Acoustic Signal Generator - Manual

OPERATING MANUALNTi Audio TalkBox 2 3© NTi Audio AGRelease 1.15.6e / Dec 2011All information subject to change without notice. © All rights reserved.® Minirator is a registered trademark of NTi Audio. ™ XL2, EXEL, M4260, M2210 and TalkBox are trademarks of NTi Audio.NTi Audio contact details: NTi Audio AG Im alten Riet 102 9494 Schaan Liechtenstein, Europe Tel. +423 - 239 6060 Fax +423 - 239 6089 E-mail info@nti-audio.com Web www.nti-audio.comNTi Audio is an ISO 9001:2008 certified company.Made in Switzer land2 3Index:1. Introduction ........................................................................................................42. Overview .............................................................................................................5General .............................................................................................................6NTi Audio TalkBox Controls ...............................................................................7Side & Rear Panel ........................................................................................... 133. How to use the NTi Audio TalkBox ..................................................................14Procedure ....................................................................................................... 14Output Level ................................................................................................... 14Lombard Effect ............................................................................................... 15CF-Card ........................................................................................................... 16My Own Files ................................................................................................. 174. Battery Option ................................................................................................. 185. Related Products ..............................................................................................206. Further Information ..........................................................................................21Registration .....................................................................................................21International Warranty and Repair ...................................................................22Warnings .........................................................................................................23Calibration Certificate ......................................................................................23CE Declaration of Conformity .........................................................................247. Technical Data ...................................................................................................254 51. IntroductionCongratulations and thank you for buying NTi Audio’s TalkBox, a product specially suited as test signal source for speech intelligibility measurements. This product pro-vides, in combination with an NTi Audio Acoustic Analyzer, the all-in-one solution for fast and comprehensive STI-PA testing of a complete public announcement system. Additionally, various other test signals are supported for further test applications. We are convinced you will enjoy using itThis manual describes the NTi Audio TalkBox operation and functions in detail. Fur-ther application information can be found on the web site.The NTi Audio TalkBox product package includes the following items:NTi Audio TalkBox• Protection Cover mounted with NTi Audio lanyard• CF-Card with test signals & individual calibration data• Mains Power Supply & Power Cord• CD “NTi Audio TalkBox”, backup copy of Memory Card• Carrying Pouch• User Manual• 4 52. OverviewNTi Audio TalkBox greatly simplifies the acoustical feed of the STI-PA intelligibility test source signal into closed sound reinforcement systems. It presents the stan-dardized voice-like acoustical signal emission simulating a human talker according to IEC 60268-16, combined with a TNO certified speech intelligibility signal at stan-dardized levels.NTi Audio TalkBox6 7GeneralNTi Audio TalkBox features human head-like dimensions. A build-in combination of solid state generator and DSP ensures highest playback accuracy and lowest sample frequency deviations with minimized jitter effects. The internal precision loudspeaker is individually calibrated to achieve a very flat frequency response in the typical frequency range of the human voice. Each TalkBox is individually equal-ized and calibrated and has an excellent frequency response accuracy of +/- 1 dB over the relevant frequency range. The radiation characteristic complies with the ITU-T P.51 in wide ranges.The perfect frequency response and the precisely correct playback sampling rate are specifically important to minimize systematic errors when performing STI-PA measurements.SpeakerThe IEC60268-16 standard specifies a sound pressure level for a speaker simulator of 60 dBA in 1 meter distance. The NTi Audio TalkBox levels are calibrated to comply with this standard. To avoid operating failures the TalkBox has no volume control.Mic Stand MountThe exact positioning the NTi Audio TalkBox in front of a microphone (at the place where a real human speaker would be) is easy using a conventional mic stand. A universal mic stand mount is available at the bottom of the box.6 7NTi Audio TalkBox ControlsBD2Version A:Version D:Version C:Version B:Revision:Sheet No:PCB:Designed:Project:Title:Date NameDrawn:Part No:CA1 3 4 5NTI AGIm alten Riet 102, FL-9494 Schaan, LiechtensteinPhone: 00423 239 60 60, www.nt-instruments.comTHIS DRAWING IS THE EXCLUSIVE PROPERTY OF NTI AG - WITHOUT THEIR WRITTEN CONSENT IT IS NOT PERMITTED TO BE COPIED OR GIVEN TO THIRD PARTIES1 2 3 4 5DCBA24.03.2005 G. Kühne02.05.2005TalkBoxPrintkontur/ElektronikBox1/1 C150 000 058G. KühneScale: 1 : 1 Weight:Tolerance:+-0.1mmAlle Masse in mm Oberfläche:Schwarz eloxiert Material: Alu 1,5mm, zum eleoxieren geeignet21.02.2005Output ModeMute LineOut SelectTrackCF CardPlay ClipLine In Line OutG. Kühne13.06.2005 G. KühneElektronikbox an den vier Ecken mit Schweisspunkt von innenLeiterplatte M 1:2Output Mode SelectorPower LEDLine OutLine InCF CardPlay LED Clip LEDSelect Track SwitchNTI Audio TalkBox ControlsOutput Mode SelectorThe output selector switch offers the following three modes:BD2Version A:Version D:Version C:Version B:Revision:Sheet No:PCB:Designed:Project:Title:Date NameDrawn:Part No:CA1 3 4 5NTI AGIm alten Riet 102, FL-9494 Schaan, LiechtensteinPhone: 00423 239 60 60, www.nt-instruments.comTHIS DRAWING IS THE EXCLUSIVE PROPERTY OF NTI AG - WITHOUT THEIR WRITTEN CONSENT IT IS NOT PERMITTED TO BE COPIED OR GIVEN TO THIRD PARTIES1 2 3 4 5DCBA24.03.2005 G. Kühne02.05.2005TalkBoxPrintkontur/ElektronikBox2/2 0002150 000 058G. KühneScale: 1 : 1 Weight:Tolerance:+-0.1mmAlle Masse in mm Oberfläche:Schwarz eloxiert Material: Alu 1,5mm, zum eleoxieren geeignet21.02.2005Leiterplatte M 1:2G. KühneOutput ModeMute LineOut SelectTrackCF CardPlay ClipLine In Line OutThe audio signal is available at the speaker and the Line Out.BD2Version A:Version D:Version C:Version B:Revision:Sheet No:PCB:Designed:Project:Title:Date NameDrawn:Part No:CA1 3 4 5NTI AGIm alten Riet 102, FL-9494 Schaan, LiechtensteinPhone: 00423 239 60 60, www.nt-instruments.comTHIS DRAWING IS THE EXCLUSIVE PROPERTY OF NTI AG - WITHOUT THEIR WRITTEN CONSENT IT IS NOT PERMITTED TO BE COPIED OR GIVEN TO THIRD PARTIES1 2 3 4 5DCBA24.03.2005 G. Kühne02.05.2005TalkBoxPrintkontur/ElektronikBox2/2 0002150 000 058G. KühneScale: 1 : 1 Weight:Tolerance:+-0.1mmAlle Masse in mm Oberfläche:Schwarz eloxiert Material: Alu 1,5mm, zum eleoxieren geeignet21.02.2005Leiterplatte M 1:2G. KühneOutput ModeMute LineOut SelectTrackCF CardPlay ClipLine In Line OutThe audio signal is muted (no signal at Line Out and speaker).BD2Version A:Version D:Version C:Version B:Revision:Sheet No:PCB:Designed:Project:Title:Date NameDrawn:Part No:CA1 3 4 5NTI AGIm alten Riet 102, FL-9494 Schaan, LiechtensteinPhone: 00423 239 60 60, www.nt-instruments.comTHIS DRAWING IS THE EXCLUSIVE PROPERTY OF NTI AG - WITHOUT THEIR WRITTEN CONSENT IT IS NOT PERMITTED TO BE COPIED OR GIVEN TO THIRD PARTIES1 2 3 4 5DCBA24.03.2005 G. Kühne02.05.2005TalkBoxPrintkontur/ElektronikBox2/2 0002150 000 058G. KühneScale: 1 : 1 Weight:Tolerance:+-0.1mmAlle Masse in mm Oberfläche:Schwarz eloxiert Material: Alu 1,5mm, zum eleoxieren geeignet21.02.2005Leiterplatte M 1:2G. KühneOutput ModeMute LineOut SelectTrackCF CardPlay ClipLine In Line OutThe audio signal is available at the Line Out. The speaker amplifier is muted.8 9Power LEDThe red Power LED indicates the following: fastflashingThe power up sequence is in process (about 10 seconds)continuously onThe TalkBox is powered on and ready for operation.slowflashingThe outputs are muted bythe Output Mode Selector or• the External Mute Input• 8 9CF-CardThe supplied CF-Card needs to be pushed into the provided slot. Up to 15 test sig-nals can be stored on the CF-Card. The size of the test signals is as big as required for the looped operation. The selected signal is further processed and seamlessly looped by the built in DSP. The CF-Card is FAT32 formatted and can be read/written by any PC/MAC with CF-Card reader. The TalkBox repeats the selected audio track as long as mains power is connected. Besides the STI-PA test signal the CF-Card contains the following additional wave forms: CF-Card Track List:1 STI-PA (Standard) 60dBASPL @ 1m2 Pink Noise 60dBASPL @ 1m3 White Noise 60dBASPL @ 1m4 Sine 1 kHz 60dBASPL @ 1m5 Male Speaker (German) 60dBASPL @ 1m6 Male Speaker (English) 60dBASPL @ 1m7 Delay Test Chirp8 -9 -A STI-PA (Lombard) 70dBASPL @ 1mB Pink Noise 70dBASPL @ 1mC White Noise 70dBASPL @ 1mD Sine 1 kHz 70dBASPL @ 1mE Male Speaker (German) 70dBASPL @ 1mF Male Speaker (English) 70dBASPL @ 1m10 11Any hot swap of the CF-Card is not supported. In case the CF-Card has been removed during operation it shall be returned and the mains power shortly disconnected to initiate the operation again.File format of audio signals*.wav file• Sample rate: 44100 Hz• Mono • 16 Bit• PCM linear quantization • File name formatThe first character of wav-file name matches the output selector switch position. So the audio files names are e.g. “1anyName.wav” or “8anyName.wav”, whereby “anyName” may describe the content of the wav-file for example “1_STIPA.wav”. The maximum length of the filename is 8 digits, e.g. “xxxxxxxx.wav”.Calibration dataThe CF-Card keeps additionally the individual calibration data of the NTi Audio TalkBox. The file is named “xxx.cal”. The CF-Card is labeled with the serial number of the corresponding TalkBox, so the CF-Card and the NTi Audio TalkBox do have the same serial number, guaranteeing accurate and calibrated operation. The serial number on the CF-Card must match with the serial num-ber of the NTi Audio TalkBox, otherwise the acoustical parameters of the TalkBox are out of specifications.10 11Play LEDThe green Play LED indicates the following:continuously onThe audio signal is replayed• At Line In mode (= Select Track switch set to “0” ) and input • signal > -30 dBuflashing Error indication, which might be caused byThe CF-Card is not plugged in or damaged• The file “serialnumber_xxx.cal” is not found on the card• The selected audio file is not available, damaged or of wrong • formatSelect Track Switch This switch allows the following selections: “0”This position selects the input signal from the input connector “Line In” to the speaker.“1” - “F” These positions select the individually stored audio tracks from the CF-Card in hex-order form (1, ... , 9, A, B, C, D, E, F).Clip LEDThe red Clip LED is activated when the Line In mode is selected (= Select Track switch set to “0”). Reduce the input level when the Clip LED flash-es.12 13Line InXLR input connector for external audio signals.The Line In mode (Select Track switch = “0”) enables to play an external audio sig-nal with the NTi Audio TalkBox. In the Line In mode the Play LED indicates an input signal > -30 dBu and the Clip LED is activated at input signals > +15 dBu. The DSP based equalization introduces a signal propagation delay of 59 ms be-tween the Line-In and the acoustical output. Consequently and in order to guaran-tee synchronicity between the acoustical output and the line-output for delay time measurements the latter is also delayed by 59 ms.Line OutUsing the balanced line out, the TalkBox operates as a signal generator. The stored signal of the CF-Card or any connected signal from the Line In connector is directly send to the Line Out connector (not equalized).12 13Side & Rear PanelNTi Audio TalkBox Side & Rear PanelExternal Mute InputNTi Audio TalkBox LabelSerial NumberDC InNTI TalkBoxS/No.: TNN039Swiss MadeSelect Track "0" for Line InputDC in10-18VExternalMuteExternal Mute InputThe External Mute Input provides the possibility to mute the NTi Audio TalkBox from a remote position, such as by using a mobile phone or radio control devices. Clos-ing an external switch connected with this 3.5mm jack connector (connecting dip & ring) will mute the audio signal equally to the output selector switch in mute posi-tion. This feature is of great help e.g. at STI-PA measurements in large buildings.Power SupplyThe TalkBox handles an input voltage range of 10-18 VDC. An external power supply (for worldwide operation) is supplied as standard. The wide input voltage range al-lows the operation even from a battery pack. 14 153. How to use the NTi Audio TalkBoxUsing the NTi Audio TalkBox as acoustical test source for STI-PA measurements provides two major advantages:Extended test coverage• Easy to handle test signal injection• The human head sized NTi Audio TalkBox replaces and simulates a real speaker when measuring speech intelligibility. Such a setup considers the entire signal path including the used microphone, the acoustical characteristics of the speaker’s cabin and existing background noise.ProcedurePosition the NTi Audio TalkBox at the typical speaker position in front of the • speaker’s microphone.Connect the external power supply. After approx 10 seconds the start up process • is completed and the NTi Audio TalkBox is ready for operation.Selected the required track number with the Track Selection Switch.• Output Mode: Set the selector switch to • Speaker for acoustical output• LineOut for electrical output signal or• Stop the signal using the Mute position.• Output LevelThe output level of the provided standard STI-PA test signals is 60 dBA @ 1 m dis-tance to the speaker. Additionally further test signals at other levels are provided, please see the CF-Card Track List for details.14 15Lombard EffectAt increasing environmental noise the human persons speaking into the micro-phone at PA systems gradually increase the sound pressure level of their speech. The standardized speaking level is 60 dBA. Our ears recognize a speaking level in-crease of 10 dBA as subjective double sound pressure level. To verify the PA system operating in good order at this physical effect, the following shall be carried out:Follow the prior described measurement procedure, using the STI-PA test • signal with 60 dBA @ 1m.Select the STI-PA test signal with 70 dBA @ 1m and verify the operation of • the PA system; no clipping shall occur.16 17CF-CardWe recommend to use original CF-Cards, NTi Audio # 600 000 087, only. Other CF-Cards may not be compatible with the NTi Audio TalkBox, thus e.g. wav-files are not replayed. For operation the calibration file xxx.cal has to be copied on a new CF-Card. You may format the CF-Card as follows:Connect the CF-Card to the PC, the card is recognized e.g. as letter “z”.• Select “Run…” from the Windows Start menu, see picture below.• Insert the term: format z: /fs:FAT32 /a:512 /x• The CF-Card is formatted to FAT32 with 512 byte cluster size and can now be • used with the NTi Audio TalkBox.Format CF-Card16 17My Own FilesYou can load your own audio files onto the CF-Card and replay with the NTi Audio TalkBox. Kindly observe the following details:Do not delete the calibration data file labeled “xxx.cal“The NTi Audio TalkBox requires the calibration data to meet the product specifica-tions. A back up copy of the calibration data is on the NTi Audio TalkBox CD en-closed, containing the original data of the CF-Card.File format of audio signals*.wav file• Sample rate: 44100 Hz• Mono • 16 Bit• PCM linear quantization • File name formatThe first character of the wav-file name matches the output selector switch posi-tion. So the audio files names are e.g. “nr_anyName.wav”, whereby “nr” is the Talk-Box selection switch position and “anyName” describes the content of the wav-file for example “9_myfile1.wav” or “A_myfile2.wav” - “F_myfile3.wav”. The maximum length of the filename (=anyName) are 8 digits.LevelThe test signal level shall be physically tested by using an NTi Audio Acoustic Ana-lyzer and the source data adjusted to requirements.LengthThe minimum length of your wave file is 100ms.18 194. Battery Option (NTi Audio # 600 000 086)DescriptionFor enabling mains power independent operation, a re-chargeable Li-Ion Battery pack is available for the Talk-Box. Its size has been optimized to perfectly fit to the side of the TalkBox. The battery comes complete with all the connectors, adaptors and works perfectly with the TalkBox power supply for charging. An integrated charge indicator shows the remaining energy in the bat-tery. Supplied Welcroe strips simplify the mounting of the battery to the TalkBox. A fully charged battery drives the TalkBox for more than 7 hours under worst case conditions. The battery pack contains Li-Ion batteries. Please recycle the bat-• tery pack in accordance with local regulations. Only charge the battery with the TalkBox power supply. Store the • battery on a dry place. Never attempt to connect the output of the battery to the output • of an external deviceCharge the batteryAs the battery comes only partially charged, please charge the battery for min. 5 hours prior its first use. Connect the TalkBox power supply to the IN con-18 19nector of the Battery pack. The connectors are compatible. The red charge LED will light up during the charge process. Once the battery is full the red LED will go off and the rightmost green (Full) LED will go on. The DC output of the battery pack is disabled during the charge process and thus not usable.Use of the batteryConnect the DC output of the battery pack with theDC input of the TalkBox using the provided connectioncable and the G/G4 adaptor. As soon as theconnection is established, the NTi Audio TalkBox startsrunning. For storage or when not used for a longerperiod of time, please disconnect the battery cablepreventing the complete discharging of the battery. To check the charge indication, press the blackcharge test button and the three green LED will indicate the charge level.Technical dataBattery type: Li-Ion BatteryInput voltage: 12V - 24V DC, 1A max.Output voltage: 9V, 2A max.Capacity: 39 Watt hours nominalDimensions: 153 mm x 93 mm x 23mm (6” x 3.72” x 0.9”) Weight: 400g (0.8lbs)Running time with battery pack (typical)Idle mode: Standby, Electrical output: 15 hoursSTI-PA: Output on (60dBSPL) 12 hoursSTI-PA Lombard: Output on (70dBSPL) 7 hours20 215. Related ProductsXL2 Audio and Acoustic AnalyzerThe XL2 analyzer forms the unique combination of a state-of-the-art Sound Level Meter, a com-prehensive Acoustical Analyzer as well as a pow-erful Audio Analyzer. The wide range of function-alities are tailored for challenging applications in Installations, Live Sound, Studio, Broadcast and Environmental Noise measurements.The measurement microphones M4260 (Class 2) and M2210 (Class 1 frequency response) are available for acoustical measurements. The XL2 generates the 48 V phantom power supply for the microphones and reads the included elec-tronic data sheet of the M4260 and M2210 au-tomatically. This promotes faster setup and en-sures accurate measurements. Additionally the XL2 logs the calibration data and microphone serial number at each measurement. STI-PA Measurement Option for XL2The STI-PA analyzer option allows the re-liable measurement of the speech trans-mission index according to the latest IEC standards within 15 sec. Besides the single value STI or CIS test result, a detailed view of the modulation indices and individual band level results is provided.20 216. Further InformationRegistrationRegister as a customer with NTi Audio and benefit from the following possibilities:Keep your products up-to-date • Access free firmware and software updates. Activate options • Enable additional functions for your products.Access premium content • Access downloads, information and specific support for your products. Receive application and product news • Sign in for the NTi Audio Newsletter. Get fast worldwide support • Register your products for fast support. Confirm your ownership • Allows us to contact you with important product notifications and provides a product record in case of loss or theft.How to RegisterOpen the web page “http://my.nti-audio.com”.• You are prompted to login or create the My NTi Audio Account.• The web page “My NTi Audio Products” opens.• Select the product type and enter the serial number.• Confirm with “Register”.• Now the product is listed in the table “My NTi Audio Products“.• 22 23International Warranty and RepairInternational WarrantyNTi Audio guarantees the functionality of the NTi Audio TalkBox against defects in material or workmanship for a period of one year from the date of original purchase, and agrees to repair or to replace at its discretion any defective unit at no cost for either parts or labor during this period.RestrictionsThis warranty does not cover damages caused through accidents, misuse, lack of care, the attachment or installation of any components that were not provided with the product, loss of parts, connecting the instrument to a power supply, input signal voltage or connector type other than specified or wrongly polarized batteries. In par-ticular, no responsibility is granted for special, incidental or consequential damages. This warranty becomes void if servicing or repairs of the product are performed by any party other than an authorized NTi Audio service center or if the instrument has been opened in a manner other than specified in this manual.No other warranty, written or verbal, is authorized by NTi Audio. Except as other-wise stated in this warranty, NTi Audio makes no representation or warranty of any kind, expressed or implied in law or in fact, including, without limitation, merchan-dising or fitting for any particular purpose and assumes no liability, either in tort, strict liability, contract or warranty for products.RepairIn the case of faulty functioning or damage please contact your local NTi Audio part-ner for assistance. If your instrument needs to be returned for service, kindly follow the service guidelines at www.nti-audio.com/service.22 23WarningsIn order to avoid any problems during the operation of the instrument, follow the notes listed below:Remove the transport protection cover prior using the TalkBox.• The NTi Audio TalkBox includes a high precision electromechanical transduc-• er with open air gap. Dust could degrade the function of this transducer. Please take care to use and store the NTi Audio TalkBox only in clean environ-ments.Read this manual thoroughly prior using this product.• Use the product for the intended purpose only.• Do not disassemble the • product.Never use the • product in a damp environment.Calibration CertificateThe NTi Audio TalkBox has been carefully tested during production and corresponds to the specifications listed in “Technical Data”. NTi Audio recommends yearly calibrations of the instrument. For the calibration of your instrument kindly follow the service guidelines at www.nti-audio.com/service.24 25CE Declaration of ConformityWe, the manufacturer NTi Audio AG Im alten Riet 102 9494 Schaan Liechtenstein, Europehereby declare that the product “NTi Audio TalkBox”, released in 2005, conforms to the following standards:EMC-Directives: 89/336, 92/31, 93/68Harmonized Standards: EN 61326-1This declaration becomes void in case of any changes on the product without writ-ten authorization by NTi Audio. Date: 15. September 2005Signature: Position of signatory: Technical Director 24 257. Technical DataWaveforms Up to 15 different signals •Waveforms can be added / changed by the user •Factory signal set •NTi Audio STI-PA Test Signal (TNO verified), Reference Speech Signal, White Noise, Pink Noise, Delay Test Signal, Sine 1 kHzLine Out XLR, balanced 100 Ohm, unbalanced 50 Ohm •Maximum output level: +18 dBu, •1 kHz file with 60 dB @ 1 meter: typically -11 dBuLine Input XLR, balanced 38 kOhm •Max. input level: +18 dBu (acc. to EBU R68, ITU-R rec. 645) •Internal delay from XLR input to speaker: 59 ms •CF-Card 256 MB included, FAT32 formatted, NTi Audio # 600 000 087 •Wav-file format: 16 Bit, 44.1 kHz mono •Acoustical Flatness STI-PA band levels (in axis): • typ < +/- 0.5 dB @ 24°C • typ < +/- 1.0 dB @ 10°C - 30°CAcoustical Output Level STI-PA: 60 dBA • SPL @ 1 m +/- 0.5 dB, acc. to IEC60268-16STI-PA band sensitivity gradient: - 0.07dB / °C (average) •Others see track list in user manual •Power Supply 10 - 18 VDC, 10 Watt •External switching power supply included (110 V .. 240 V) •External Mute Jack 3.5 mm (1/8“), floating switch requiredMounting Mic Stand 5/8” with Adapter to 3/8”Dimensions (LxWxH) 150 x 150 x 175 mm (5.9 x 5.9 x 6.9 inch)Weight 3.5 kgOperating Temperature 0° to +45° C (32° to 113° F)26 27Typical Frequency Response Chart NTi Audio TalkBox:60 dBSPL @ 1 m = 66 dBSPL @ 0.5 m • 10 kHz6766656463626160686970100 Hz 1 kHz10 HzFrequencySound Pressure Level dBSPL @ 0.5m+/-1 dB Tolerance26 27You may stick this table onto your NTi Audio TalkBox:1 STI-PA (Standard) 60dBASPL @ 1m2 Pink Noise 60dBASPL @ 1m3 White Noise 60dBASPL @ 1m4 Sine 1 kHz 60dBASPL @ 1m5 Male Speaker (German) 60dBASPL @ 1m6 Male Speaker (English) 60dBASPL @ 1m7 Delay Test Chirp89A STI-PA (Lombard) 70dBASPL @ 1mB Pink Noise 70dBASPL @ 1mC White Noise 70dBASPL @ 1mD Sine 1 kHz 70dBASPL @ 1mE Male Speaker (German) 70dBASPL @ 1mF Male Speaker (English) 70dBASPL @ 1m28 2928 293030E 500 dt 12.11 1. Introduction 2. Overview General NTi Audio TalkBox Controls Side & Rear Panel 3. How to use the NTi Audio TalkBox Procedure Output Level Lombard Effect CF-Card My Own Files 4. Battery Option 5. Related Products 6. Further Information Registration International Warranty and Repair Warnings Calibration Certificate CE Declaration of Conformity 7. Technical Data