Acoustilyzer AL1 measures RT60 in 1/3 Octave Resolution
Now
the Acoustilyzer is offering reverberation time testing also in 1/3
octave band resolution. By utilizing a specific new set of band limited
pink noise signals the RT60 measurement can be extended from the
standard 1/1 octave band resolution to the increased 1/3 octave band
resolution.
The
required special test signals are available as *.wav files for free
download and installation into the Minirator MR-PRO. The Acoustilyzer
measures RT60 with 1/3 octave resolution according ISO3382 standard,
which applies for room acoustic measurements. With the new MR-PRO test
signals offers the Acoustilyzer an accurate and low cost reverberation
time measurement with 1/1 and 1/3 octave resolution.
Three octave RT60 measurements are combined resulting in a
1/3 octave resolution RT60 graph.
 Technical Details:
The individual measurement signals include 1/3 octave limited pink
noise at six different center frequencies. The RT60 measurement range
from 100Hz to 5kHz includes 18 pieces of 1/3 octave bands. Thus you may
carry out with the Acoustilyzer three RT60 measurements, each with
another test signal, thus all required 18 test results are available.
Then the individual measurement are imported into an Excel template,
automatically combining and visualizing these individual RT60
measurements into a complete 1/3 octave resolution result.
You may download the application note
NTI_AppNote_AL1_with_RT60_third_octave
explaining how to carry out the measurement step by step.
The required test signals for the MR-PRO are available for download at http://support.nti-audio.com/mr2/.
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Bugfix for Minirator
MR-PRO
In
the last newsletter we introduced the firmware V2.01 featuring extended
impedance measurement. During extensive onsite testing we found the
Minirator MR-PRO displaying wrong test results at very low impedances
and short circuits.
This
bug has been fixed immediately. The improved new firmware V2.02 is
available for download now. For any firmware update, please follow the
instructions below.
Firmware-Upgrade Instructions for
Minirator & Digirator
The
Minirator and Digirator are supporting an easy to execute firmware
upgrade procedure. We offer the computer software "MR_Up-date" for free
download, which automatically checks the NTI website for new firmware
versions.
The firmware upgrade takes a few seconds, please follow the instructions below:
1. When updating your Minirator for the first time:
- Download the software "MR_Up-date" from the NTI website http://support.nti-audio.com/mr2/.
- Install and run "MR_Up-date"
- Follow the instructions shown in "MR_Up-date".
2. If you have already updated your Minirator before:
- Switch your computer online.
- Run the software "MR_Up-date" , which automatically checks the NTI website for any new firmware available. No further manual download is required.
- Follow the instructions shown in "MR_Up-date".
3. If you don't have a computer with an on-line connection:
- Use any other computer with on-line access and download the new firmware from the NTI website http://support.nti-audio.com/mr2/
- Run the software "MR_Up-date".
- Follow the instructions shown in "MR_Up-date".
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NTI Acoustic solutions for London Underground
Have you traveled on the London Underground and trying to understand
the station announcements telling you whether you are really on the
right platform? If you are able to recall such scenarios you know the
intelligibility is often bad.
Well, not for much longer. A program has been started to improve the
speech intelligibility in the underground stations, the worst are the
first to be upgraded. The assigned rail service companies decided to
use Minstruments for this task with the professional support of our
British representative Neutrik UK. They purchased a number of Acoustic
& STI-PA Sets including the NTI TalkBox. The Acoustic & STI-PA
Set is assisting the contractors in recording and scientifically
testing the sounds from announcements for audibility and
intelligibility. This allows them to repair or replace faulty
microphones and speakers and improve the audio system performance. The
work has started at Queensway Station and will gradually cover all
stations in the Underground network. So, in the very near future we
will all know if we are on the right line. :-)
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Londo Tube Station |
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Improved speech intelligibility in connecting aisles |
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