Presentation on theme: "IJData, Luleå, Sweden http://www.ijdata.com LspCAD 6 IJData, Luleå, Sweden http://www.ijdata.com."— Presentation transcript:
1IJData, Luleå, Sweden http://www.ijdata.com LspCAD 6IJData, Luleå, Sweden
2LspCAD = Loudspeaker Computer Aided Design A software tool for the construction of loudspeakers.Box modeling with predefined models for the most popular box types.Crossover modeling for both passive and active analog and digital filters.Box models and crossovers can be built in the same design.Design with the objective to both enable fast prototyping and advanced design optimization.Standard and Professional version.Drag and drop interface.
3Main windowUnlimited number of projects open (limited by system memory)Template projectContains templates for popular building blocks such as closed/bass reflex box, active 2nd order HP/LP filter.Wizard properties for most of the templates, speeds up design considerably.
4Schema window Up to 10 schema pages Two operation modes Edit mode, add, move, delete components, pick components from component traySimulate mode, change properties (component values) and see result immediately
5Schema window, edit mode Passive componentsVoltage source wire and GND (not exactly passive but located here anyway)Resistor, Capacitor and Inductor, the latter two with ESR, loss and Ri.Complex impedance component, makes it possible to import measured Z of eg. an inductor.Ideal transformer with N1:N2 turns ratio.Loudspeaker symbol for imported SPL and Z.Connector symbol, makes it possible to connect between schema pages.Switch, makes it possible to route signals in different directions or switch on/off filter legs.
6Schema window, edit mode Active analog/digital componentsIdeal OP amplifierG(s) G(z) fast prototyping filter blocks,Analog HP/LP filter up to 8th orderPeak/Notch, allpass, bass/treble boost and 2nd order HP/LP eq.Matlab directform filter coefficients.Digital Pole/zero and BiQuad.Imported transfer functions.Phase linear FIR filters (up to 4097 filter taps)Sum/add delay and buffer elements for rudimentary digital filters.Models of commercial digital crossovers.
7Schema window, edit mode Box cabinet componentsT/S parameter modelBox load and radiation componentPort and passive radiator componentHorn componentBaffle / Near boundary reflection component, makes it possible to simulate baffle diffraction and the impact of the reflections from the closest walls and floor.Other componentsUser note component, add user notes on the schema
8Schema window, simulate mode In simulate mode component properties are accessed with either a left or a right click on the mouse.Effect of property changes is seen immediately in the graphs.A number of Store/Recall buttons makes it possible to compare designs fast.
9Graphs A number of graphs shows most of the aspects of the design SPL mag and phase and Transfer functionImpedanceVoltage/CurrentGroup delay and time domain responseOff axis simulationPolar plotGraphs can be cloned, this makes it possible to see many graphs at the same time.
10Graphs, polar mapThe polar map displays the off axis reponse as a function of frequencyBoth vertical and horizontal polar map
11Optimizer Optimize SPL, transfer function or impedance Large number of options, slopes, notches/peaks etc.Optimize with penalty function on low load impedanceLock crossover frequencies in a given range.Bandpass boxes can be optimized with a lock on total volume.Undo button makes it possible to revert in case optimization turns out bad.
12SnapshotCompare different designs or the same design under different operating conditions
13Tolerance analysisInvestigate how component variations affect the final resultNominal, min and max data can be exported for pass/fail testing
14Crossover emulator Emulate the crossovers without building them. Use line input or WAV file as sourceCompensates for protection capacitor (recommended for treble units) and cable losses.Emulator impulse response automatically dumped to file for later use in externa convolver such as BruteFIR.
15justMLS Measurement program Measure SPL or transfer functions Measure impedancePossible to merge near and far field measurements
16KHF tool Combine near and far field measurements. Add contribution from port and drivers for a total response.Apply baffle diffraction to nearfield measurement.Side mounted placement of drivers possible.
17TemplatesTemplates are building blocks that are useful in everyday work.Active templatesPassive templatesLoudspeaker boxes
18More features Driver component Off axis simulation, either piston model or imported off axis dataThermal modelingCan link to a baffle / near boundary component for simulation diffraction and reflection effects.
19More features Box modeling Based on electrical analog circuit models of the items constituting e.g a bassreflex box (port, box..)Possible to build arbitrary boxes using building blocksTo make things simpler, templates for well known box types hide the circuit model (optional).
20More features T/S Driver component Thermal modeling Can link to a baffle / near boundary component for simulation diffraction and reflection effects.Bl(x) and Cms(x) nonlinearity modeling, models impact of SPL and ZCan import data from Praxis, CLIO and KlippelBuilt in component editor