Modeling of a Simple Loudspeaker Enclosure|
Short video showing how to build a simple loudspeaker model with a rear volume and a radiating
front surface. Topics include basic loudspeaker behavior, importing Thiele-Small parameters,
and plotting electrical impedance.|
Acoustic Microphone Modeling
Short video showing how to build a simple ported microphone model as one may see in a cellphone or
tablet. Topics include front port Helmholtz resonance, using graph buffers, effects of acoustic
cloths to keep out foreign material, and exporting model parameters to the clipboard.|
Introduction to Ear Simulators and their use in the Ares Acoustic Modeler
An introduction to ear simulators used in the telephony and audio industries, including mechanical "ears" and
"real pinna" ears used on head and torso simulators (HATS). A description of how the Ares Acoustic Modeler
handles these simulators are given as well as examples of how to use the simulators.|
One limitation of ear
simulators is in capturing the behavior of devices which go into an ear canal. The IEC-711 or ITU Type 2 ear
simulator is designed to model the effects of audio devices which drive the entrance of the ear canal, but not
devices which are inserted into the canal. Ares can be used to overcome this limitation and model the effects
of inserting devices into the ear canal. This is done through the uses of ports with negative
lengths. A discussion of how to do this starts at 39:00.
Prior to the December 20, 2016 release of
Ares version 1.400, there was an error in the IEC-711's ERP to DRP transfer function. This has been corrected.
This error is discussed at 49:50 in the video.
An example of how to create your own "custom ear simulator model"
is discussed at 52:40. Custom ear simulators are important when your audio device interacts with an ear in ways
that the original ear simulators weren't designed to capture.
NOTE: This video says that the lower left node of the Ear Simulator element produces an equivalent HATS diffuse
field pressure that would generate the DRP pressure. However, since this video was made, an option has been
added to allow you to select this node to produce the equivalent diffuse or free field HATS pressure, not just
the diffuse field pressure.
Using a the graph element in the Acoustic Modeler
Lengthy video going through all of the features in the Modeler's graph element. Topics include using
graph buffers, plotting pressure, velocity, displacement, impedance, electrical quantities. Plotting
magnitude, real and imaginary parts, phase, linear vs dB values, octave plotting, as well as
metrics as well as: average level, speech weighting, Zwicker loudness (Sone/Phon), RLR, and SLR. Applying
A, B, C, ITU P.50 speech, and psophometric weightings. Importing and exporting data and using response masks.|
Plotting and Exporting Impedance Data From the Ares Acoustic Modeler
Short video showing how to plot and export impedance data from a headset model using the graph element.|
Introduction to Acoustically Modeling Porous Material in Ares
Introduction to the physical effects of porous material on the acoustic process, the porous material modeler in Ares, and an example of using it in the modeler.
Some of the applications of porous materials is in increasing the effective volume of a speaker cabinet and adding damping to long port being used as a waveguide.
Using Knowles and Sonion elements in Ares Acoustic Modeler
This video provides a brief introduction to using Knowles Electronics and Sonion Corporation's microphone and speaker/receiver elements.|
Microphone Modeling using Sensitivity and Impedance Tables
This video shows how to model an omni microphone using complex
frequency dependent sensitivity and acoustical impedance lookup tables. The acoustical resistor, acoustical
transfer function, and omni microphone are used to model the complex behavior. The lookup tables can be
supplied by the microphone vendors.|