Vox User Manual
Contents
1. IEC 60268 16 rev 4 IEC 61672 Class 2 ANSI S1 4 Type 2 VOX SPEECH INTELLIGIBILITY TESTER Operating manual VOX 01 Contact information and support The VOX 01 is designed and manufactured in the Netherlands and supplied by SDi USA You can contact SDi at the following address SDi 1345 Campus Parkway Suite A18 Wall Township NJ 08736 Tel 732 751 9266 Fax 732 751 9241 Email sales sdifire com Web www sdifire com Updates of the system s firmware and documentation are released online www sdifire com NOTE Screenshots and product pictures shown in this manual correspond to the VOX 01 hardware platform 1 1 running firmware version 1 1 Once you update the firmware the screenshots may not fully correspond to what is being displayed on your device s screen SDi 2014 All rights reserved SDi and VOX Speech Inteligibility Tester are registered trademarks Document version 1 12 release date September 2014 Applies to model s VOX O1 VOX 01 Operating Manual Contents Contact information and support 2 1 Introduction 4 2 General use and safety precautions 5 Safety precautions when charging 5 Safety precautions related to connectors 6 3 Getting started 7 4 Using the VOX 01 8 Quick STIPA 8 STIPA pro 11 SPL meter 14 Settings 16 Calibration 18 Status 20 Accessing saved measurements from a PC 20 5 Power a2. will also work calibration AN Measured level Reference level awa 94 1 94 0 asa A 110 100 90 80 70 60 50 Calibration module while measuring a 1 kHz calibration tone To start calibrating apply the calibrator to the microphone or place the microphone in a known sound field Then press start Do not worry if the reference level shown is incorrect you can change this after the measurement An octave band spectrum will be shown while the equivalent continuous A weighted sound level is measured Once this measurement is finished the VOX 01 will show the results VOX 01 Operating Manual calibration Measured level Reference level awa 94 1 94 0 aa Calibration factor was change iR Calibration factor will be Calibration module showing calibration results The new calibration factor sensitivity adjust of the device is shown as well as the original calibration factor as currently used in the device The differences between the old and new value are typically small less than one dB unless you have connected a different signal source or microphone than the device is currently calibrated for The calibration factor is derived from the measured LAeq as well as the reference level of your calibration signal source You can now change the reference signal level press the cor responding button on the right of the screen and enter the correct value The
3. a few times e If the battery charge indicator appears to become inaccurate e g the bat tery is drained quickly from the point that the indicator still shows 50 charge it also helps to completely discharge and recharge the battery 7 If you start using the VOX 01 after a long period of storage we recommend that you first top off the charge before using the instrument You may also want to check if the date and time settings were preserved VOX 01 Operating Manual 4 It is normal for the total battery capacity to slowly decrease over time After 500 charge recharge cycles the battery capacity is normally at 80 to 90 of its original capacity depending on the way the device is used and recharged 5 We recommend that you do not charge while measuring The instruments measuring electronics are highly sensitive the digital charging circuitry may have an impact on the noise floor of the pre amplifier and microphone while noise and hum from the AC charger may also be inserted Although the electronics have been protected against such sources of interference we still recommend against recharging while doing actual measurements Power saving recommendations How long the device can be used on a single charge depends on the mode and intensity of use Power conservation settings can be controlled from the device s hardware settings menu With its default settings approximately 350 STIPA measurements can be carried out over the
4. calibration factor will be re calculated If you are satisfied that the new calibration factor is correct press save Note that the new calibration settings only take effect once you press save We recommend that you verify your new calibration in the SPL meter app Re apply your calibration signal source and check that the correct reference level is measured Once you press save the measured calibration factor is committed perma nently to the device s non volatile memory This overrides earlier calibrations VOX 01 Operating Manual Status System status information can be read using the status module If you contact SDi for technical support you may be asked to provide some of the information displayed here such as the firmware version and hardware revision The status app is not used to make changes to the system Accessing saved measurements from a PC When you connect the VOX 01 to the USB port of a PC or Mac a dialog window will appear on the VOX 01 asking if you wish to start data transfer If the VOX 01 is powered off when you connect it through USB it will power on automatically The VOX 01 will present itself to the USB host as a mass storage device This allows you to access the internal file system of the VOX 01 You will see these directories folders s Battery battery status information Calibr Calibration data SPL SPL measurement results 7 STIPA STIPA measurement results s System system
5. course of an 8 hour day without recharging Some ways to extend the battery life Switch off the device when you do not plan to use it for a while e Choose conservative power settings in the hardware menu The LCD back light is a considerable factor in the overall drain on the battery 5 Disable pre amp phantom power if you use a microphone that does not need it Use of power banks and external battery packs For very long measurement sessions the battery capacity of the internal battery may be insufficient If you cannot spare a few hours of recharge time in the middle of your session we recommend that you use an external USB battery pack aka power bank You can also power the VOX 01 from an AC power source through its own charger or any USB power source but it is not recommended to power the device this way while measuring The device will be more susceptible to electronic noise and ground loop effects Even though the device has been certified to comply with the applicable EMC standards also when connected to an AC source the signal quality is always slightly better when powered from batteries When you connect the VOX 01 to an external battery pack a dialog will appear asking you whether you want to charge the device We recommend that you do not recharge the intermal battery from the power bank so choose no This way all power will be supplied by the external power bank The internal battery will not be charged
6. nor discharged while meas uring Note that the battery pack should have an output current rating of at least 1500 mA VOX 01 Operating Manual 6 Cleaning maintenance and calibration With normal use no further maintenance is needed beyond normal cleaning periodic re calibration ofthe device We recommend that you have the device checked and calibrated at our factory or at an external calibration specialist at least once every 2 years We recommend having the battery pack replaced after approx 500 charge recharge cycles We recommend that you clean the instrument with a soft cloth LCD display cleaner can be used to clean the touch screen provided that the following precautions are taken Do not spray cleaner directly onto the display Only use cleaning liquids specifically intended for LCD screens Battery disposal The device contains an 4 8v rechargeable NiMH battery pack At the end of K the life cycle of this product care should be taken to dispose of this battery pack responsibly in compliance with rules and regulations for recycling of batteries that apply in your region MAKE SURE THAT THIS BATTERY PACK IS REMOVED BEFORE DISPOSING OF THE DEVICE If you are unable to remove the battery pack youself by unscrewing the back lid of the device make sure that you mention the presence of an NiMH battery pack when hand in the entire device for recycling VOX 01 Operating Manual 7 Product warranty The device is co
7. screen will not respond to presses while the backlight is turned off but measurements will continue to run whether the backlight is on or off VOX 01 Operating Manual Calibration The VOX 01 the instrument itself as well as the microphone is calibrated before leaving the factory A calibration certificate is included with the device However it is recommended that you carry out your own user calibrations from time to time especially under the following conditions g You are using the device in temperatures considerably above or below room temperature 7 You are planning to use the device again after a prolonged period of storage s You are planning to do measurements for which a high degree of accuracy is required e g certification measurements Compact calibrators with Class 2 Type 2 compliance are available from a number of vendors These calibrators generate a test tone which is adaptively adjusted to a fixed accu rately know signal level usually 94 0 dB This makes calibration relatively easy insert the microphone tip into the port of the calibrator using an adapter with suitable dimensions for the microphone tip 1 4 7mm The device should now measure the nominal signal level produced by the calibrator The VOX 01 is easily calibrated with any stable sound source of a known reference level This can be a calibrator but a steady sound field the level of which is measured by another calibrated SPL meter
8. touch screen digitizer The system date and time are changed by means of the arrows up down Remember that you changes are not applied until you press set clock 4 system O A calibrate ach R touch Date and time in the settings module The VOX 01 has an internal real time clock that keeps running even when the device is powered off The clock needs to be adjusted if the battery has been depleted completely for instance when the device has not been used for a very long time The system date and time are used for time stamping the saved data If you download measurement data over USB the file creation date time are only accurate if the internal real time clock of the VOX 01 was updated to the right date and time Press the calibrate touch button if the response of the touch screen appears to be inaccurate Calibration takes place by pressing exactly on the indicated marks near the corners of the screen We strongly recommend that you use a stylus for calibration to obtain N calibration settings that are as accurate as possible Not that false responses during the calsibration procedure tapping completely in the wrong place may render the touch screen unusable VOX 01 Operating Manual microphone A 48V phantom 48V 48V Turn off LCD backlight after IN turn ON f turn OFF 5 minutes Mic preamp gain 04B 20dB 30 s 1 min 2 mins 5 mins 0dB adjust adjust 48V phantom power may damage external devic
9. a fully IEC 60268 16 rev 4 compliant test signal compatible with all STIPA meters that conform with the standard 0 0 25 0 50 0 75 Qualification A Excellent ualification Excellent enp empo STI measurement screen of the Quick STIPA module in digit mode left and bar mode right In order to carry out an STI measurement complete the following steps 7 Power on your VOX 01 and go to Quick STIPA Now start playback of the STIPA test signal through the channel or system which you intend to test Note that the STI that you will now measure will characterize all parts of your transmission path from playback device up to the microphone of your VOX 01 VOX 01 Operating Manual 4 Tap Start on the VOX 01 7 Wait for 25 seconds while the measurement takes place Make sure that signal playback is not interrupted and that the acoustic environment is stable and free from impulsive sounds such as door slams 5 You will see that the STI on your screen stabilizing towards its end value 7 Optionally you can press save once the measurement is finished to store the data to be browsed or downloaded to PC later A measurement number is assigned to each saved measurement This number is displayed at the bottom right of the screen preceded by a character above the battery indicator That is really the entire procedure If you are new to STIPA measurements please consult tutorials and standards to mak
10. are updates Firmware updates are released through the website www sdifire com Before updating your firmware always check 7 If the update you downloaded is intended for your device type the VOX 01 7 If you have sufficient battery charge to complete the update cycle without interruption Interrupting the power supply during the update process may render your device unusable If this happens try to repeat the update procedure If this does not work please contact support sdifire com Executing a firmware update is easy ki Choose and download the correct firmware update package from www sdifire com Connect the VOX 01 to any PC or Mac through USB 7 When prompted on the LCD screen choose connect through USB s The VOX 01 s internal file system can now be accessed from your computer in the same way as any mass storage device Copy the firmware updated package to the folder named updates g Now restart the VOX 01 using its power button The firmware update procedure will automatically start You will be able to see the progress of the update procedure which may take between 3 and 30 minutes depending on the size of the update package on the LCD display Never interrupt the firmwate update procedure Make sure that the VOX 01 is fully charged or connected to a stable power source before starting the update procedure Please be aware that the update procedure may take a significant amount of time depending on the up
11. bination of the above settings is measured simultaneously However not all of these combinations are displayed only two level measurements are displayed at the same time Each of these two levels is shown in its own bar graph and its own digit field The red graph corresponds to the red field the blue bar graph to the blue field You are free to select which level to display in each of the two fields Tap the set button in the level field to choose time weighting frequency weighting max hold and time integration settings for the corresponding field VOX 01 Operating Manual The settings screen in the SPL module allows you to set the measurement time Once you press start the measurement will run for as many seconds as you choose here You may also choose to let measurements run continuously you then determine the measurement time manually by choosing the moment you press stop The SPL meter module also features are measurement browser that lets you review previously saved sound pressure level measurements A few things to note about SPL measurements and the SPL meter module By definition max hold and EQ are mutually exclusive settings The elapsed measurement time is shown above the progress bar If the measurement interval is set to continuous the measurement will run until it is manually stopped The progress bar itself is not used when measuring continuously When you press save
12. cial ports marked Boost or Charge These can then also be used to charge the instrument Note the instrument will NOT charge from a standard USB port on a PC or Mac The current supplied through a computer USB port is normally in A N sufficient to charge the device The fact that the device may be powered from such a USB port does not necessarily imply that there is sufficient current left to also charge the battery The VOX 01 has internal charge circuitry that optimizes your charge time while safeguarding the life span of your battery pack Ifyou are not using the VOX 01 for a prolonged period you can safely keep the VOX 01 connected to a charger A small trickle charge will be drawn making sure that your VOX 01 stays at full charge A few charging tips 4 When connected to the supplied charger the battery is usually at 90 charge within 2 5 hours The last 10 is topped off at a much lower cur rent When in a hurry you may choose not to wait for this much slower top off phase e A LED next to the USB shows the charge status While blinking alter nating between green and orange the battery is still charging The LED burns constant green as soon as the battery is full If you find over time that the battery capacity is reduced significantly com pared to its original capacity we recommend that you fully discharge the batteries and then fully recharge them If necessary this procedure may be repeated
13. data from the current measurement is stored Results based on all time and frequency weightings supported by the module are saved not just the results that are currently displayed However since the instantaneous levels fluctuate throughout the measurement these cannot be saved as a single number representing the entire measurement interval So for each saved measurement just the maximum level max hold and equivalent continuous level EQ are saved As a logical consequence the measurement browser can only display Max Hold and EQ results from earlier measurements If you set a display field to show instantaneous values the measurement browser will leave this display field blank You can use the measurement browser to look go back to earlier measurements and see what the level is with different time and frequency weightings applied The measurement number series used for SPL measurement is separate from the STIPA measurement numbers An SPL measurement and a STIPA measurement can have the same number without data being over writen VOX 01 Operating Manual Settings The settings module will allow you to configure the generic settings of the device in addition to the module specific settings found in each module The following attributes can be set Time and date s Time interval before the backlight automatically switches off to save power 4 Phantom power to the microphone 7 Microphone pre amplifier gain Calibration of the
14. date package that you are installing VOX 01 Operating Manual 9 Technical specifications Functionality Speech Transmission Index STIPA Octave band Real Time Analyzer in STIPA pro mode Sound Pressure Level meter A C Z slow fast Leq Anounced for 2014 firmware updates 1 3 and 1 1 RTA FFT analyzer Standards compliance IEC 60268 16 rev 4 IEC 61672 class 2 ANSI S1 4 type 2 Acoustic Effective noise floor lt 26 dB A Linear range 30 124 dB with supplied microphone Linear range electric input 22 125 dB Microphone Omnidirectional free field microphone Flat frequency transfer conforms with class 2 type 2 require ments 48V phantom powered 30 mV Pa sensitivity Display Resistive LCD touch screen 320x240 pixels 65k colors Luminance typ 250 Cd m2 Durability 100k finger slides 1M taps Data storage 4 GB internal storage for data and program code Accessible from PC through USB mass storage mode Environmental Temperature 5 35C 41 95F Relative humidity 5 90 non condensing Power NiMH battery pack 4 8V nominal typ 2200 mAh Typical battery lifetime gt 4h Max charge current 1 8A Electromagnetic Complies with EN 61326 1 2006 compatibility FCC part 15 compliant class A device Mechanical specs Size approx 210 x 85 x 55 mm excl microphone Weight 530 g including microphone Rear mounted tripod adapter Hook for carrying cord Bundled items Carrying case measuring instrument class 2
15. e VOX 01 Operating Manual STIPA pro The STIPA pro module is also used to measure the Speech Transmission Index but unlike the quick STIPA module it also comprises features that allow you to analyze and manipulate your measurement data in greater detail Rud NasxK ing disabled 99 8 99 8 88 8 78 8 68 8 54 8 40 0 ssoves SS OHOOO on Hao SENGYGYES mangana sanane an an an an an an ani SESISIH gt USUSUG AKA ANA pa ponpon pa aa a aan a SSeosso ue 00008 enp STI and spectrum and measurement details screen in the STIPA pro module The STIPA pro module has five screens STI and spectrum display measured STI octave spectrum and dBA level Measurement details display all measurement details including the MTF Settings configure the STIPA pro module Additive noise enter and enable disable a noise spectrum to add to data Browse measurements review saved measurements Measurements are usually started from the STI and spectrum or the measurement details screen STI measurements are set up and started in the same way as when using the Quick STIPA module see above However in the STIPA pro module more details about the measurement are shown and the user has more elaborate options to configure the measurement Measurements are started stopped and saved in the same way as with the Quick STIPA module by using the buttons at the bo
16. e informed decisions about the STIPA signal playback level measuring positions number of repeated measurements etc The Quick STIPA module also shows some additional measurement information The A weighted sound pressure level The qualification band a letter between A and U that is used in some standards and defined in IEC 60268 16 rev 4 A label bad excellent the characterizes intelligibility based on the STI The arrows in the blue bar on the top of the display van be used to navigate through the different screens for each module The Quick STIPA app has three screens STI settings and browse measurements amp settings data shown as large digits STI qualification bands z change are displayed Use red buttons above to control the way data is presented 89 06800 00000 Settings screen and browse measurements screen The latter screen is nearly identical to the STI measurement screen but with previous back buttons instead of start stop and save buttons The settings screen give you some options to control the appearance of your measure ment results VOX 01 Operating Manual 4 Choose between presentation of the STI in large digits or as a bar plot 7 Choose whether or not you want to see the qualification bands displayed The browse measurements screen allows you to review earlier saved measurements without having to download your data to a PC f
17. e settings menu IMPORTANT connecting equipment not designed for 48V phantom power to the VOX 01 connector with phantom power switched on will permanently damage the connected device The manufacturer explicitly denounces responsibility for any damages to third party hardware resulting from exposure to the VOX 01 s phantom power VOX 01 Operating Manual 3 Getting started You should receive your VOX 01 with sufficiently charged batteries to start the device and get acquainted with its features We do recommend that you fully charge the device using the supplied charger before starting your first real measurement session The device is powered on by pressing the red power button once Note the power button can also be used to power the device off If you press the button while the device is in operation you will see a dialog window asking confirmation before powering off If the power button is kept pressed for 10 seconds in the power on state the device will be forced into the off condition This can be used to reset the device if it becomes unresponsive keep pressed to 10 seconds to switch off then press again to restart The VOX 01 will boot into the main menu You can launch its different modules from this menu VQX SPEECH INTELLIGIBILITY TESTER main menu STIPA quick SPL pro STIPA meter tion Specialized Fire Products 100 STIPA pro module that gives you access to all STI measurement deta
18. erably hotter than that check ventilation and contact support if the problem persists Update PC drivers VOX 01 is approached as a mass storage Driver problem device Select USB data transfer mode when dialog window appears on the VOX 01 screen Device in measurement mode Backlight time out event Adjust backlight time out in power saving settings Pressing power button turns the display back on Internal software problem Keep the power button pressed for 10s This forces the device to shut down Then press the power button again to restart If the problem persists contact support VOX 01 Operating Manual Specialized Fire Products SDi 1345 Campus Parkway Suite A18 Wall Township NJ 07753 Tel 732 751 9266 Fax 732 751 9241 Email sales sdifire com Web www sdifire com SPEECH INTELLIGIBILITY TESTER VOX 01 Operating Manual version 1 1 SDi 2014 All rights reserved
19. es Only use with 10 mins 30 mins never phantom powered microphones such as the standard SMxx mic ape Microphone pre amp settings left and power saving settings right The internal microphone amplifier of the VOX 01 features an adjustable gain setting Adjust Adjustment of the pre amp gain is hardly ever necessary since the system has a very wide linear dynamic range of 130 dB However if you wish to connect an external signal source which operates at lower signal levels than the VOX 01 microphone you can choose adjust the pre amp gain by approximately 20 dB Note that this value of 20 dB is not exact recalibration will be needed With the standard microphone this setting should be 0 dB You can also set the backlight to automatically switch off if the touch screen has not been touched for a while This time out can be set between 30 seconds and 30 minutes or the backlight can be set to never turn off at all The backlight time out option saves a considerable amount of battery pow er But keep in mind that it will cause the screen to black out without turning the device off Don t forget to turn the device off when you finish working with the device the fact that the screen is dark does not necessarily mean that the device is turned off If the LED next to the USB port burns then the device is still turned on To turn the backlight back on again if a back light time out has occurred press the power button The touch
20. files 7 Update place update packages here to update the firmware upon reboot IMPORTANT you can access the VOX 01 system files so that you can easily backup and restore the device However keep in mind that some of the internal software of the VOX 01 is run directly from the files displayed here If you remove or change any of these files your VOX 01 will not work properly anymore Instructions on how to perform firmware updates is given in the section 8 of this manual In order to process and analyze the results further copy all results files from the VOX 01 to a local folder on your PC If you leave the measurements on the VOX 01 then the VOX 01 will simply continue its measurement numbering series where it left off If you remove the measurements the VOX 01 will start over with measurement 1 The measurement files are saved in csv format These files can be imported in almost all worksheet application such as Microsoft Excel This will allow you to analyse the data further and pre process the data for the purpose of reporting VOX 01 Operating Manual 5 Power and charging Charging instructions We recommend that you charge your VOX 01 only with the USB charger supplied with the instrument Alternatively you can charge the device through any external USB wall charger wall wart with a charge current of 1500 mA or higher Some PCs allow increased charge currents to be drawn from their USB ports sometimes through spe
21. g any data not actually shown during the measurement itself 7 Measurements can also be retrieved over USB please refer to the section accessing saved measurements on a PC for further instructions For larger numbers of measurements processing of these saved data files e g through worksheet software may be more efficient than inspection through the measurement browser VOX 01 Operating Manual SPL meter The VOX 01 is also Sound Pressure Level meter also known as SPL meter or SLM that complies with IEC 61672 Class 2 and ANSI S1 4 Type 2 In fact the VOX 01 electronics far exceed the requirements for a Class 2 Type 2 device The layout and buttons of the SPL meter app are similar to the STIPA module featuring three screens SPL measurements settings and browse measurements a SPL measurements AN SPL measurements screen The following sound pressure level measurement settings are supported Time weighting Fast F and Slow F 7 Frequency weighting Z linear unweighted A weighted C weighted 7 Max hold holds and displays the maximum level during the measurement interval used with either Fast or Slow time weighting 7 Equivalent continuous EQ computes the time integrated level over the measurement interval the level shown corresponds to the level of a contin uous signal containing the same amount of energy as the measured signal Once a measurement has started each com
22. h care We recommend that you always use a lanyard to secure your device against dropping by suspending it around your neck or wrist If you use a tripod to mount the device during measurements we recommend that you use a sturdy model with a sufficiently wide base 4 Do not expose the device itself the measuring microphone or charger to rain moisture or liquids of any kind Take special care to prevent liquids to permeate into the device through the connectors or along the display bezel Do not operate at ambient temperatures over 35 C 95 F 5 Do not use close to flames or open fire 7 Do not use in environments where flammable or explosive materials are used Do not keep the device powered on while unattended for prolonged periods of time 3 During transportation and storage keep the device in a suitable casing or container preferably its original case The device needs to be protected from shocks and vibration due to transportation or falling excessive temperatures liquids and moisture and any other external conditions that could do damage to the device Care should be taken that other objects cannot come into direct contact with the display during transportation ki Make sure that the device is switched off before transportation and storage Safety precautions when charging The VOX 01 is a battery powered rechargeable device with an internal low self discharge NiMH battery pack This battery pack is designed fo
23. ils Quick STIPA simple module to quickly do STIPA measurements SPL meter Sound Pressure Level meter module Settings change the system s hardware configuration Calibration calibrate the VOX 01 and its microphone Status general information on the measurement system All modules will be explained in detail in the following sections of this manual Apart from these modules the VOX 01 has two specific operating modes charging via USB and data transfer via USB These modes will also be explained further on in this manual VOX 01 Operating Manual 4 Using the VOX 01 Quick STIPA The Quick STIPA module is intended to do simple and straightforward STI measurements using the STIPA test signal A comprehensive explanation of the STI method is beyond the scope of this device manual there are several online and offline resources that provide guidance and information on doing STI measurements In this manual we will briefly explain how to set up your equipment for measuring the STI The Quick STIPA module makes the process as simple as possible For any STI measurement you need a source of the STIPA test signal as well as an STI analyzer In your case the analyzer is your VOX 01 What the signal source is depends on what kind of measurement you aim to carry out The Embedded Acoustics reference STIPA test signal is included with the VOX 01 on a USB flash drive and can also be downloaded from the SDi website free of charge This is
24. ion induced by the channel settings STI qualification bands are displayed Level dependent model change features turned ON Noise NOT included in displayed STI take from last 1 dB 1dB measurement 00000 00000 empty empty Settings screen left and additive noise screen right The settings screen gives the user three options 7 Choose whether or not to display STI qualification bands A U as standardized in IEC 60268 16 These bands are used in certain applications 7 Choose to enable or disable the level dependent model features level dependent masking and the speech reception threshold For standard measure ments these features should be turned ON Only when all electric transmission chains are tested without any acoustics involved should these features be turned off since there is no acoustic level reference in those cases s Choose whether or not to computationally add noise to the measurement VOX 01 Operating Manual There are two ways to include the influence of background noise in your STI measure ment Simply do your measurement in the actual noise environment The STI method is designed to incorporate the effects of any noise present during the measurement representatively in the measured STI This approach works well if the noise field is stable and free from fluctuating and impulsive components 5 If you have the option to physically turn the noise off then it is often
25. irst g Use to blue buttons at the bottom of the screen to scroll back and forth through your saved measurements 7 Note that the measurement number displayed above the battery indicator corresponds to the measurement currently shown on the screen gt Interpreting larger numbers of STIPA measurements by using the browse measurements screen will be inefficient we recommend downloading the data to a PC for this Please take note of the following features of the Quick STIPA module g On the bottom left of the screen a red recording dot is displayed when ever a measurement is running Below this red dot the progress of the cur rent measurement is indicated by a progress bar s The save button is only operational when new unsaved measurement data is available from a finished measurement If this is not the case the save icon is colored gray 7 The VOX 01 calculates a heuristic reliability metric for each STI measure ment If the measurement is found to be unreliable e g due to disturbance by impulsive sounds then a red cross is displayed across the STI value Crossed out STI values are often seen at the beginning of measurements when the calculation has not ran long enough to compute a reliable STI As soon as the cross disappears the STI value can be trusted to be within the usual STI measurement error of 0 03 00008 aap A crossed out STI value means that the measurement is not yet sufficiently reliabl
26. ltage on the USB power supply and or audio connector 5 Any mechanical damages to the display caused by mechanical forces ap plied to the screen surface such as scratches Normal wear and tear The following voids warranty 4 Repair attempts by an unauthorized party Replacement of battery packs by an unauthorized party Removal of product stickers tamper proof seals bar codes or serial numbers VOX 01 Operating Manual Malfunctions that are found to result from any of the above conditions are not covered by warranty Repairs will take place only at the expense of the owner If claimed under war ranty an examination fee may be charged and transportation costs will be charged to the owner Please do not attempt to open your VOX 01 yourself as there are no user serviceable parts inside If you do see a legitimate need to open the device yourself please contact SDi first so we can discuss preserving your warranty rights Please be aware that the product is protected by tamper proof seals A worldwide pick up and return service is included in the warranty This means that we will have the defective unit picked up at your location at no charge provided that it is presented in its original equipment case packed in a cardboard box with suitable cushioning material Service maintenance contracts are available from SDi For further information please contact SDi at service sdifire com VOX 01 Operating Manual 8 Firmw
27. microphone USB charger int charger adapters US EU UK AU USB charg ing data cable manual carrying cord USB flash drive with test signals VOX 01 Operating Manual 10 Troubleshooting System does not power on after Battery empty Connect wall charger for at pressing power button least 30 minutes System does not recharge after connecting through USB Display shows error messages green text Battery lifetime is too short Battery indicator is inaccurate Device warms up during use Device not recognized by PC when connected through USB Display backlight turns off no response to touch screen Device hangs becomes un responsive or will not power up after resetting and or LED next to USB port burns red Charge current too low Use bundled wall charger standard PC USB ports do not supply enough current to charge Error on display processor or in If the problem persists contact communication between DSP support and display processor Battery not fully charged Keep device on charger for at least 4 hours Battery is worn Have battery replaced after ap prox 400 charge cycles Battery charge measurement Completely drain the battery system poorly calibrated e g and then fully recharge Repeat due to self discharge after pro if necessary longed shelving Lack of ventilation Warming up of the device to temperatures of approx 35 C 95 F is normal If the device runs consid
28. more accurate to add the noise computationally in a so called post hoc calculation The VOX 01 does this for you if you enter the noise spectrum in the additive noise screen and change the setting to Noise included in displayed STI If you wish to add noise computationally the screen additive noise should be used to en ter the noise spectrum Note that the noise spectrum that you enter is only used if you also select the corresponding option in the settings menu You can browse through all measurements saved earlier in the browse measurements screen The following tips and pointers may be useful to remember when browsing STI measure ments with Quick STIPA and STIPA Pro Measurements saved in Ouick STIPA can be browsed in STIPA pro and vice versa The measurement numbering range is shared between these modules This means that you can use STIPA pro to investigate measure ments done with Quick STIPA in more detail using the browsing screen in STIPA pro G The settings you choose in STIPA pro additive noise level dependent masking affect the current measurement but also affect which data is shown in the measurement browser This means that you can always enter a noise spectrum and see how this affects measurements you did earlier on Similarly you can go back later on and see what affect level dependent masking has for a certain measurement 7 This implies that all data for each measurement is always saved includin
29. nd charging 21 Charging instructions 21 Power saving recommendations 22 Use of power banks and external battery packs 22 6 Cleaning maintenance and calibration 23 Battery disposal 23 7 Product warranty 24 8 Firmware updates 26 9 Technical specifications 27 10 Troubleshooting 28 EC declaration of conformity 29 VOX 01 Operating Manual 1 Introduction Congratulations on purchasing the VOX 01 STIPA meter the most advanced instrument for measuring the Speech Transmission Index ever built designed and manufactured by the inventors of STIPA The VOX 01 is also a fully compliant Class 2 Type 2 Sound Pressure Level meter Using the VOX 01 is quite easy thanks to its touch screen operation and intuitive menu structure Most users will get the hang of doing measurements with the VOX 01 without spending much time with this manual Nonetheless we strongly recommend that you do read through this manual before starting to use your VOX O1 in order to get acquainted with the various features of the device and the procedures for charging and maintaining your device Class 2 Type 2 microphone Touch screen Power button N Status LED USB charge amp data port Tripod mount Hook for carrying cord Serial number VOX 01 Operating Manual 2 General use and safety precautions The VOX 01 is a sophisticated electronic measuring instrument that should be used maintained and stored wit
30. r many years of operation and therefore cannot be swapped out by the user Recharging takes place through the mini USB connector found on the left side of the device The VOX 01 is charged through the USB connector using high currents of up to 1500 mA While being charged the device will heat up DO NOT CHARGE THE DEVICE WHILE IT IS INSIDE A CLOSED CON TAINER BOX BRIEFCASE ETC Please make sure that the device can shed excess heat while charging VOX 01 Operating Manual A The supplied charger includes adapters for use worldwide and operates on a wide AC voltage range of 100 240V Do not use the charger if the casing appears cracked or broken or if it has been exposed to fluids or moisture Contact with components inside the charger while this is plugged in may result in serious injury or death Safety precautions related to connectors A A The VOX 01 features a USB connector and an XLR connector to which the microphone is attached If you connect external devices to these connectors please ensure that these connections are protected against over voltage and power surges The voltage supplied to the USB port should not exceed 5 5V As the USB power circuitry is connected to the battery pack excessive voltage applied to the USB port may cause the battery pack to catch fire or explode The XLR connector supplies 48V phantom power to the microphone This phantom voltage can be switched on and off through the hardwar
31. ttom of the screen The STI and spectrum screen shows not only the current STI value and the A weighted sound pressure level but it also shows an octave band spectrum of the measured signal in the 7 octave bands from 125 Hz to 8 kHz The STI analysis is carried out in these octave bands The scale of the octave band spectrum plot can be modified by tapping on the triangualar arrows to the left of the plot VOX 01 Operating Manual The measurement details screen shows all the diagnostic details of an individual STI measurement s OCT The octave center frequency Hz 7 REL The octave band levels relative to the STIPA signal spectrum this is effectively the frequency transfer function of the tested channel in octaves g MTI Modulation Transfer Index This quantifies the contribution to the overall STI from each octave band mr the m values modulation transfer function in octave band OCT for modulation frequency mf These m values are uncorrected not adjusted for masking effects and additive noise Since the STIPA signal features two modulation frequencies per octave band there are also two m values per octave band The modulation frequencies are also shown mf s TI the Transmission Index per octave band for each modulation frequency These measurement details will enable more experienced operators to determine not only the speech intelligibility of the tested channel but also the causes of intelligibility reduct
32. vered by a full service worldwide pick up amp return warranty until 24 months after the date of purchase Please direct all warranty claims to SDi 1345 Campus Parkway Suite A18 Wall Township NJ 08736 Tel 732 751 9266 Fax 732 751 9241 Email sales sdifire com Web www sdifire com Please email us and wait for our response typically within a business day before shipping your hardware back We may ask you to fill out an RMA form and we will supply you with a reference number for your warranty claim If you can provide a complete statement of the problems you are experiencing this will help us solve your hardware issues as soon as possi ble Always provide the ID number of your device found on the bar code label on the back of the device your name and address and your date of purchase If you did not purchase directly from SDi also include dated proof of your purchase In general our warranty programme covers all defects except for those resulting from acci dents misuse including improper electrical connections and improper maintenance The following is explicitly excluded from product warranty Any damage resulting from dropping falling or excess vibration 7 Any damage done by liquids including damage resulting from excessive use of screen cleaning liquids 4 Any damage resulting from incorrect electric connections to the device through the USB and or audio connectors Any damage done by power surges or overvo
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