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EASERA makes all of the most useful and
important audio test and measurement tools – MLS (Maximum
Length Sequence), TDS (Time Delay Spectrometry) and dual-FFT
– available to anyone with a laptop PC and a “good”
sound card.
For the past six months, audio professionals have been beta-testing
EASERA, exploring the benefits of its uniquely powerful and
flexible software architecture, which allows extensive post-processing
and comparison of different measurement and analysis methods.
Their feedback has been incorporated into the first full release
of EASERA, which is now available from Renkus-Heinz.
Software Design Ahnert’s EASERA takes advantage of GHz
CPU performance to turn a sound-card-equipped laptop computer
into a complete audio measurement system and a powerful analysis
tool that offers easy access to multiple views of the same
measurements. Four independent modules - a measurement module,
a signal generator, a real time analyzer, and a post-processing
module – are included in the program. EASERA is a two-channel
measurement system with a maximum sample rate of 48 kHz. EASERA
PRO allows up to 32 simultaneous inputs and outputs with individual
volume controls, record and playback modes and re-sampling.
at sample rates of up to 192 kHz. Optional modules include
an MLS module that includes Hadamard Transform and Cross Correlation
functions, and the TEF-TDS module developed together with
Gold Line that implements Time Delay Spectrometry measurement
and processing entirely in software. The TDS software includes
a tracking filter that provides superior noise immunity, and
requires a TEF-USB AD/DA converter/preamp. The TEF-USB input
device, or a high-performance sound card, is required for
use with the MLS module.
While some advanced functions require specific hardware components
such as calibrated microphones, EASERA can be used with any
microphone and supports all currently available sound cards.
The software is compatible with all Windows® sound drivers,
including Direct Sound®, Wave and ASIO drivers.
Designers of audio components, sound systems and listening
environments all understand that no single measurement technique
captures everything that we hear. EASERA is designed to provide
multiple views of the same data stream for easy comparison
and more penetrating analysis and understanding than has been
possible up to now. EASERA’s post-processing engine
calculates all acoustic functions and measures according to
ISO Standard 3382, based on octave or 1/3 octave filters.
The real time analyzer provides multiple views suitable for
fast on-site analysis or to obtain a precise view of the acoustic
environment. Functions and measurements include “waterfall”
Energy Time Curves (ETC), Impulse Response, STI, %ALCONS,
Direct and Total SPL, RMS, Crest Factor, distortion, and many,
many more. EASERA exports data in a variety of formats, including
WAV, EASE®, TEF® and MLSSA®. Automated transforms,
and in fact all of EASERA’s functions, are available
through a target-oriented user interface. The number of data
sets is limited only by PC memory, and FFT block size is limited
only by CPU capabilities.
Measurements can be taken using a variety of stimulus signals:
Time Delay Spectrometry, a sweep, a MLS (Maximal Length Sequence),
a noise excitation signal or custom user-defined signals.
EASERA supports up to 32 bit data resolution (hardware dependent,
and can compensate for the hardware frequency response as
well as for the loudspeaker and microphone used. An automated
input volume control maximizes S/N.
Once data has been acquired, EASERA’s powerful editing
features include user-defined filters and windows, addition,
division, merging and cutting of files, smoothing, averaging,
integrating, and differentiating. The RTA module displays
a real-time level chart, a level histogram or a spectrogram.
Measurements can be weighted and displayed on logarithmic
or linear scales in a range of resolutions.
Like EASE® and AURA®, developed by the sister company
Acoustic Design Ahnert, EASERA is distributed by Renkus-Heinz.
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