Bedrock SM50 Manuel utilisateur
Bedrock SM50
Operating manual
© 2015 Embedded Acoustics BV Document version 1.4
IEC 60268-16 rev. 4
IEC 61672 Class 2 / ANSI S1.4 Type 2
2 Bedrock SM50 operating manual © Embedded Acoustics BV, 2015
Contact information and support
The Bedrock SM50 is designed and manufactured by Embedded Acoustics BV in the
Netherlands, by the very team that originally developed the Speech Transmission Index.
You can contact the manufacturer at the following address:
Embedded Acoustics BV
Ampèreweg 18
2627 BG DELFT
The Netherlands
www.embeddedacoustics.com
www.bedrock-audio.com
Phone: +31 88 8770700
Fax: +31 88 8770799
Email: [email protected]
Updates of the system’s firmware and documentation are released online :
www.bedrock-audio.com
NOTE: Screenshots and product pictures shown in this manual correspond to the SM50
hardware platform 1.0 running firmware version 1.4. Once you update the firmware, the
screenshots may not fully correspond to what is being displayed on your device’s screen.
© Embedded Acoustics BV, 2013-2015. All rights reserved.
Embedded Acoustics and Bedrock are registered trademarks.
Document version 1.4, release date May 2015. Applies to model(s): SM50.
2 Bedrock SM50 operating manual © Embedded Acoustics BV, 2015
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 SM50 8
Quick STIPA 8
STIPA pro 12
SPL meter 16
Real-Time Analyzer (RTA) 19
Settings 21
Calibration 24
Status 26
Accessing saved measurements from a PC 26
5. Power and charging 28
Charging instructions 28
Power saving recommendations 29
Use of power banks and external battery packs 29
6. Cleaning, maintenance and calibration 30
Battery disposal 30
7. Product warranty 31
8. Firmware updates 33
9. Buttons, icons and symbols 34
10. Technical specifications 36
11. Troubleshooting 37
EC declaration of conformity 38
4 Bedrock SM50 operating manual © Embedded Acoustics BV, 2015
1. Introduction
Congratulations on purchasing the Bedrock SM50 STIPAmeter, the most advanced instru-
ment for measuring the Speech Transmission Index ever built, designed and manufactured
by the inventors of STIPA. The SM50 is also a fully compliant Class 2 / Type 2 Sound
Pressure Level meter and a 1/1 and 1/3 octave Real-Time Analyzer. It offers a wide range
of measurement options, catering to a wide variety of different acoustic measuring needs.
Using the SM50 is quite easy, thanks to its touch-screen operation and intuitive menu
structure. Most users will get the hang of doing measurements with the SM50 without
spending much time with this manual. Nonetheless, we strongly recommend that you do
read through this manual before starting to use your SM50, in order to get acquainted with
the various features of the device and the procedures for charging and maintaining your
device. With a little care, you can expect years and years of reliable and trouble-free opera-
tion from the SM50.
Class 2 / type 2
microphone
Power button
Charge status LED
USB charge & data
port
Touch screen
Tripod mount
Hook for
carrying cord
Serial number
4 Bedrock SM50 operating manual © Embedded Acoustics BV, 2015
5
2.General use and safety precautions
The SM50 is a sophisticated electronic measuring instrument that should be used, main-
tained 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 35oC/95F
• 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.
• Use the charger only with the international adapter suitable for your region.
• Make sure that the device is switched off before transportation and storage.
• 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 tem-
peratures, liquids and moisture, and any other external conditions that
could do damage to the device. Care should be taken that other objects can-
not come into direct contact with the display during transportation.
Safety precautions when charging
The SM50 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 there-
fore cannot be swapped out by the user. Recharging takes place through the mini USB
connector found on the left side of the device.
The SM50 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.
6 Bedrock SM50 operating manual © Embedded Acoustics BV, 2015
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 SM50 features a USB connector and an XLR connector (to which the
microphone is attached). If you connect external devices to these connec-
tors, please ensure that these connections are protected against overvoltage
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 phan-
tom power to the SM50 XLR connector (with phantom power switched on)
will permanently damage the connected device and/or the SM50. The man-
ufacturer explicitly denounces responsibility for any damages to third-party
hardware resulting from exposure to the SM50’s phantom power.
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7
3. Getting started
You should receive your SM50 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.
First of all, connect the microphone to the instrument using the XLR connector at the top
of th device. Next, the device is powered on by pressing the red power button once.
Note: the power button is also 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 SM50 will boot into the main menu. You can launch its different modules from this
menu.
STIPA pro
: app that gives you access to all STI measurement details
Quick STIPA
: simple app to quickly do STIPA measurements
SPL meter
: Sound Pressure Level meter app
Settings
: change the system’s hardware configuration
Calibration
: calibrate the SM50 and its microphone
Status
: general information on the measurement system
RTA
: Real-time analyzer
All modules will be explained in detail in the following sections of this manual. Apart from
these modules, the SM50 has two specific operating modes: charging via USB, and data
transfer via USB. These modes will also be explained further on in this manual.
8 Bedrock SM50 operating manual © Embedded Acoustics BV, 2015
4. Using the SM50
Quick STIPA
The Quick STIPA module is intended to do simple and straightforward STI measure-
ments 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, such as our own white
paper on this topic.
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 SM50. You can choose whatever type of STIPA
signal source that suits your application best (TalkBox, media player or otherwise).
The Embedded Acoustics reference STIPA test signal is included with the SM50 (on a USB
flash drive) and can also be downloaded from the Bedrock 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.
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 SM50 and go to Quick STIPA
• Now start playback of the STIPA test signal through the channel or system
which you intend to test.
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9
• 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
SM50.
• Tap “Start” on the SM50
• Wait for 18 seconds while the measurement takes place. Make sure that
signal playback is not interrupted, and that the acoustic environment is sta-
ble and free from impulsive sounds (such as door slams). Note: the STIPA
pro module uses a longer measurement time of 25s. A measuring time of 18s is
a reasonable minimum, within the range allowed by the standard, to arrive at
accurate results.
• 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.
The steps described above are essentially 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 module has three screens: “STI”,
“settings”, and “browse measurements”.
The “settings” screen gives some options to control the appearance of your measurement
results:
• 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 the 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.
“
10 Bedrock SM50 operating manual © Embedded Acoustics BV, 2015
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.
Reviewing 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 refer
to the section “accessing saved measurements through a PC.”
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
whenever a measurement is running. Below this red dot, the progress of the
current 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 qualification band (a letter between A and U) is just a different way to
represent the STI number; it is fully redundant. We currently recommend
working only with the STI value itself, unless the use of qualification bands
is explicitly required.
• The SM50 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.
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