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Summary of Contents for Convergence Instruments ACAM 64
- Page 1 ACAM_64 User’s Manual December 18 2021 Bruno Paillard...
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Page 2: Table Of Contents
INTRODUCTION _____________________________________________ 3 WARNINGS _________________________________________________ 3 THEORY OF OPERATION ______________________________________ 3 Frequency, Aperture Size, and Image Resolution ____________________________________ 4 Spatial Sampling and Upper Frequency Limit _______________________________________ 4 Field of View (FOV) _____________________________________________________________ 5 Audio Beamformer _____________________________________________________________ 5 FEATURES __________________________________________________ 5 ACAM_64 APPLICATIONS _____________________________________ 6 GETTING STARTED __________________________________________ 6 Software Installation ____________________________________________________________ 6... - Page 3 TROUBLESHOOTING ________________________________________ 10 USB Driver Installation _________________________________________________________ 10 Electrostatic Discharges ________________________________________________________ 10 ACAM_64...
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Page 4: Introduction
Introduction ACAM_64 is a USB-connected acoustic camera and beamforming acoustic array. Its 64-microphone array allows it to produce 32x32-pixel (128x128-pixel interpolated) real-time images showing sound sources in its field of view. Warnings Never blow air at or near the microphones. •... -
Page 5: Frequency, Aperture Size, And Image Resolution
Figure 1 An array of microphones captures the sound waves hitting the array from many different directions. For every pixel, a massively parallel digital processing engine applies specific delays, and sums the acoustic signals from every microphone, so that the signals from a specific angle of incidence (azimuth and elevation) arrive in phase. -
Page 6: Field Of View (Fov)
between sources that are within the field of view, and sources that are outside, leading to artifacts such as phantom images. For ACAM_64, the distance between microphones is 23 mm, so that frequencies up to 7.5 kHz can be imaged properly. In practice the array is sampled at 16 kHz, with a Nyquist frequency of 8 kHz. The anti- aliasing filters in the camera ensure that the signal energy is low above 7.5 kHz. -
Page 7: Acam_64 Applications
ACAM_64 Applications Detection, tracking and recording of acoustic sources. • • Soundproofing. • Mechanical product design for acoustical performance. Getting Started Software Installation • On the PC that is used to setup the instrument, run Instrument_Manager_Installer.exe. This installs the Instrument_Manager application, as well as its USB driver and documentation. Note: Perform the software installation above BEFORE connecting the instrument to the PC for the first time. -
Page 8: Instrument_Manager Application
Instrument_Manager Application Figure 2 Instrument Manager Controls 1. Real-time acoustic image 2. Cursor 3. Instrument information 4. Instrument frequency response 5. Frequency response controls 6. Trace of past levels (in dB) 7. Image persistance control 8. Lin/Log image mapping 9. Image interpolation button 10. -
Page 9: Main Functions
1. Connect the instrument to an available USB connector on the PC. 2. Make sure that the operation LED turns green. If not, review the installation procedure, or see section Troubleshooting 3. Go Start\All-Programs\Convergence_Instruments\Instrument_Manager Instrument_Manager.exe. 4. The front-panel described in appears, and the application tries to connect to the Figure 2 instrument. -
Page 10: Persistance Control
7.2.7 Persistance Control This control adjusts the persistence of the image. This is the equivalent of the exposure time for an optical camera. A persistence of a 200 to 300 ms is recommended for most applications. A longer persistence will allow the averaging of the image over longer time periods, and therefore present images with less noise. - Page 11 Troubleshooting USB Driver Installation If the Instrument_Manager application is unable to communicate with the ACAM_64 it may be because the USB driver failed to install properly. To check the USB driver installation, follow the procedure below: 1. Make sure the Instrument_Manager application has been installed BEFORE the instrument is connected to the PC for the first time.
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