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■───┘ B E A T P R O U D L Y P R E S E N T S: └───■
└──────────────────────────────────────────────────────────────────────┘
...Grenander.Software.Workshop.LoudSpeaker.Lab.v3.1.3-BEAT....
Date.: 0707 2006 Supplier.: Team BEAT
Disk.: [xx/01] Cracker..: Team BEAT
Type.: Loudspeaker design
URL..: http://www.lsp-lab.com
■ ┌──────────────────────────────────────────────────────────────┐ ■
├───┘ R E L E A S E N O T E S └───┤
└──────────────────────────────────────────────────────────────────────┘
This is the 3:rd big revision of LoudSpeaker LAB and it is now
totally re-written in C++ which is an object oriented
language. The program can be used for box design, x-over
design and measurement.
Box Design
At the moment is it possible to design and simulate closed,
vented and band-pass enclosures. Passive radiator and dual
vented band-pass enclosures will be added soon as a free
upgrade. The drivers is stored in a big database this has the
advantage of easier selection of a driver, if you measure the
Thiele-Small parameters can they easily be inserted in to the
driver database. In previous versions where the parameters
entered in another window which was hiding the curve windows,
in version 3 is the curves shown in the resizable design
window.
X-Over Design
The x-over part have been totally re-written, the simulator is
now a nodal analyzer like SPICE. You can either start a new
design with the guide or you can place components by yourself
in any combination by dragging them from the toolbar. The
simulation result is collected in one window where you can
zoom in on a specific curve by just double clicking on one of
the curves (zoom out by double clicking again).
Issues
At the moment are there a bug in the simulator that makes the
result only valid for 1:st and 2:nd order filters, this will
be fixed ASAP.
Measurement
This is the heart of the program and the wave engine have full
support for 192 kHz/24 bit audio with VXD or WDM (WinMe/2K/XP)
mode, so most of the good soundcards out there should work.
The measurement support absolute measurements and it will only
require a good multi-meter with a low voltage (<= 30 Volts)
ave or rms AC mode for calibration (the procedure use a 110 Hz
sine wave).
Time-Domain Stimulus Types
White MLS
Pink MLS
Spike
External Wave File
The MLS is the preferred choice for acoustic impulse
measurements but for electrical measurements is a spike just
as good. The external wave file is for those who want to test
strange stimulus waveforms.
Frequency-Domain Stimulus Types
Gated Sine Wave
Log Sine Sweep
The Gated Sine Wave is used for distortion testing and the Log
Sine Sweep is used for near field high resolution measurements
and impedance measurements.
Analysis Result Windows
Frequency Response
Polar-Plot - This window is combined with a frequency graph
where you can select which frequencys that is visible in the
polar-plot.
Impedance - This can show both single impedance curves and
complete Thiele-Small impedance curve pairs.
Impulse (PIR) - This window also have these result curves:
Step Response, Shroeder Plot, ETC and Log Square.
CSD (Waterfall) - This can be shown in standard 3D form or as
a sonogram where the color show the magnitude.
Multi-Graph - Can show several frequency and impedance curves
at the same time (good for comparison and documentation).
Quality Control
The program have full support for QC testing, the lower and
upper limits can be manipulated separately and they can be set
to check different columns. Sweep tables are also supported
for fast testing e.g. with 3 frequency's like 20, 1000 and
20000 Hz. The editing of the limit values takes place in an
Excel like window.
Post Processing
An impulse response can be processed with an Adaptive PIR
Filter which remove most of the reflections on the curve, this
makes it possible to make far-field measurements down to
around 100 Hz in a normal living room. And there is of course
smoothing, normalization etc for frequency and impedance
curves.
Instruments
L-C-R meter
Function Generator
Oscilloscope
Spectrum Analyzer
RTA
These instruments is very valuable for real-time measurements
like when optimizing the placement of your speakers or just
for electrical measurements.
Calculators
There is a menu with curve calculators, you can Add, Subtract,
Multiply, Divide and Average curves, you can also merge far
and near field measurements to form an anechoic equivalent
frequency response.
Import/Export
The program can import a whole bunch of formats including the
MLSSA formats, the file is analyzed when it is imported so it
can also import many unknown file types. Export of frequency
curves, impedance curves and polar plot's is possible in text
format, impulse curves can be exported in both text and PCM
Wave format.
Hardware
There is no measurement box bundled with LoudSpeaker LAB
anymore. I recommend Behringer UB802 mixer and a Behringer
ECM8000 microphone as a good starting point, for those who
want better quality do I recommend you to take a look at
Earthworks Audio Products measurement microphones. There are
many soundcards out there and I have used Terratec (EWX 2496
and DMX 6 Fire LT) and Creative (Extigy and Audigy 2 NX USB)
cards while developing, with these should everything work
flawlessly.
■ ┌──────────────────────────────────────────────────────────────┐ ■
├───┘ I N S T A L L N O T E S └───┤
└──────────────────────────────────────────────────────────────────────┘
Just run LspLAB313.exe to install.
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├───┘ / __ / __/ / /| | / / └───┤
│Updated On/ /_/ / /___/ ___ |/ / │
`─[o8/o5]─/_____/_____/_/ |_/_/───────────[ cAN yOU fEEL tHE bEAT? ]──'