VisiSonics Digital Array Microphones (VDAM)
Easily deployed and configured array microphones that provide unmatched performance/price
The VisiSonics Digital Microphone Array (VDAM) system’s patented digital microphone array technology offers the ultimate in flexibility.The VDAM system provides the ability to chain several microphones together in series, reducing wire clutter. Since the A to D conversion is done right at the microphone capsule, the architecture completely eliminates the costly add-ons (preamplifiers, analog to digital equipment, and processing computers) necessary to the operation of other microphone arrays.
Our system easily connects directly to your computer using, industry standard, USB2.0 and data can be streamed into Matlab so that you can tryout your algorithms on the fly! Alternately, they can be streamed to disk or SSD for later analysis.
To supplement our microphone arrays, we offer a microphone array toolbox for Matlab, where we provide documentation and example code from Matlab and C for simple Beamforming algorithms and Speech Enhancement.
VisiSonics’ Panoramic Audio Camera’s powerful acoustic forensic analysis capabilities and realistic soundscape reproduction are now available as a VR experience. Many manufacturers are developing head mounted displays (HMD) for virtual reality, and VisiSonics has integrated its software output with the much talked about HMD from Oculus, the DK-1, and the soon to be released DK-2.
Audio technicians can now more intuitively use the enhanced hearing capability. Experts and managers need not be present at the scene of a test to experience and visualize the results. The HMD tracks what you are looking at in the audio/visual scene where suspected noise sources/leaks can be identified by simply looking in that direction.
You can make full surround recordings to share and show a before and after recording to easily demonstrate noise problems and/or your solutions to colleagues, customers and interested parties “in-situ” both visually and acoustically. The VisiSonics Panoramic Audio Camera/Oculus HMD integration is the next step in telepresence applications where at your desk or on your couch is “As Good As Being There”.
When rotating machine (or its part) vibrates, it generates acoustic signals related to rotational speed that are caused by mechanical flaw such as misalignment, imbalance, bearing defect, etc.
Order (harmonic component) analysis has been one of the most popular analysis methods for detecting such flaws in various fields of industry: automotive; aerospace, industrial equipment, household appliances, etc. Reliability engineers mostly rely on order analysis for examining rotating machinery. Behavioral analysis for rotating or reciprocating machinery is essentially related with the rotational speed and its harmonic components.
Some of those components are observable in acoustic signal itself in the time domain. However the pattern appears fairly complex. One way to reduce this complexity is to apply a power spectrum. It is more distinguishable in the frequency domain by depicting machine-related signal component. In the power-spectrum, signals that are periodic in the time domain appear as peaks in the frequency domain. For example, if a vibration peak occurs twice every revolution at the same shaft position, a peak appears at the second order in the order spectrum. However, the power spectrum is not applicable when the speed of rotating machine changes.
Order tracking is a method to evaluate orders (harmonic component) regardless of the rotation speed of machine. This can be done by synchronizing the sampling of input signals to the instantaneous angular position of the machine shaft using a resampling technique. As illustrated in Figure 1, rather than a constant number of samples per time, this results in a constant number of samples per revolution and transforms the analysis to the order domain rather than the frequency domain.
RealSpace 3D Audio
To create a convincing artificial audio environment for a user wearing headphones, sound processing must faithfully reproduce the acoustic spatial cues which would have been received at the ears from a real audio environment. These cues include those created by scattering off the listeners’ body (using a head-related transfer function or HRTF) and cues due to the environment (using customizable room models). RealSpace 3D achieves high resolution by including proprietary adjustments necessary to accommodate the complex interplay between the two cues.
Our proprietary algorithms are efficient, and are already being incorporated in gaming engines. A native library and a Unity plugin are available. The latter supports complex scripting, and allows the game designer to interactively design the audio experience. Perception of 3D is enhanced when the HRTF of the user is customized. VisiSonics is developing technologies for HRTF personalization resolved by rapid measurement on anthropometry (physical measurements), and machine-learning based customization from a HRTF database.