Vox VOX-01 Manuel utilisateur
Operating manual
IEC 60268-16 rev. 4
IEC 61672 Class 2 / ANSI S1.4 Type 2
SPEECH INTELLIGIBILITY TESTER
VOX
SPEECH INTELLIGIBILITY TESTER
VOX
Specialized Fire Products
SPEECH INTELLIGIBILITY TESTER
VOX
VOX-01
2 VOX-01 Operating Manual
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:
Updates of the system’s firmware and documentation are released online :
www.sdifire.com/support/#productsoftwareupdates
NOTE: Screenshots and product pictures shown in this manual correspond to the VOX-01
hardware platform 1.8 running firmware version 1.8. Once you update the firmware, the
screenshots may not fully correspond to what is being displayed on your device’s screen.
© SDi, 2017. All rights reserved.
SDi and VOX Speech Intelligibility Tester are registered trademarks.
Document version 2.0, release date October 2017. Applies to model(s): VOX-01.
SDi,
3535 Route 66, Building 6
Neptune, NJ 07753
Tel: 732-751-9266
Fax: 732-751-9241
Email: [email protected]
Web: www.sdifire.com
See page 46 for new
features added in V2.0
3
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
Real-Time Analyzer (RTA) 16
Fast Fourier Transform Anazlyzer 18
Reverberation Time Meter (RT60) 20
LAEQ Logging 26
5. Power and charging 38
Charging instructions 38
Power saving recommendations 39
Use of power banks and external battery packs 39
6. Cleaning, maintenance and calibration 40
Battery disposal 40
7. Product warranty 41
8. Firmware updates 43
9. Technical specifications 44
10. Troubleshooting 45
VOX-01 Operating Manual
Oscilloscope 30
USB Audio Device Mode 31
Settings 32
Calibration 34
Status 36
Accessing saved measurements from a PC 36
Accessing saved measurements from a PC 37
11. New in Update 2.0 46
4
Class 2 / Type 2
microphone
Power button
Status LED
USB charge &
data port
Touch screen
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, a 1/1 and 1/3 octave Real-Time Analyzer, a Fast Fourier Transform
Analyzer, a Reverberation Time Meter, an Oscilloscope, and much more. Its wide range of
measurement options cater to a variety of different acoustic measuring needs.
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-01, in order to get acquainted with
the various features of the device and the procedures for charging and maintaining your
device.
Tripod mount
Hook for
carrying cord
Serial number
VOX-01 Operating Manual
5
2. General use and safety precautions
The VOX-01 is a sophisticated electronic measuring instrument that should be used,
maintained and stored with 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.
• 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
• Do not use close to flames or open fire.
• 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.
• 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.
• 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 for 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
6
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
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 hardware 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
STIPA
pro
quick
STIPA
SPL
meter
settings calibra-
tion status
main menu
100%
SPEE CH INT ELLIGIBILITY TESTER
VOX
Specialized Fire Products
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
STIPA pro
: module that gives you access to all STI measurement details
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.
menu.
7
VOX-01 Operating Manual
8
4. Using the VOX-01
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 a fully
IEC-60268-16 rev.4 compliant test signal, compatible with all STIPA meters that conform
with the standard.
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:
• 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.
Quick STIPA
VOX-01 Operating Manual
9
• Tap “Start” on the VOX-01
• 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).
• You will see that the STI on your screen stabilizing towards its end value.
• 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 make 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”.
“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
10
• Choose between presentation of the STI in large digits or as a bar plot
• 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 first.
• Use to blue buttons at the bottom of the screen to scroll back and forth
through your saved measurements.
• Note that the measurement number displayed above the battery indicator
corresponds to the measurement currently shown on the screen.
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:
• 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.
• 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.
• 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.
A crossed-out STI value means that the measurement is not (yet) sufficiently reliable
VOX-01 Operating Manual
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