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DRA Laboratories - MLSSA Acoustical Measurement System DRA Laboratories Welcome to the home page of DRA Laboratories and the MLSSA Acoustical Measurement System. MLSSA 10WI Rev 9 and MLSSA SPO 4WI Rev 9 Released MLSSA version 10WI Rev 9 will run under Windows XP for analysis-only of measurements stored on disk. MLSSA was also updated to conform to the latest specification for Male and Female STI measurements according to IEC 60268-18 Third Edition (2003-03).
Acoustic solutions manufacturer Vicoustic has released ViTUNE, the company's first acoustic measurement software.More than simply a measurement tool, ViTUNE is designed to help both audio professionals and hi-fi enthusiasts tune their rooms without requiring specialist training. As well as the acoustic analysis and measurement tools in the basic DATS Toolbox package, there are three options in the DATS software that are designed to measure and acoustic data – the Acoustic Analysis Suite, the Psychoacoustics Analysis Suite and the DATS Sound Mapping Software. Acoustic Analysis Suite. The suite covers a wide range of acoustic s.
MLSSA SPO version 4WI Rev 9 was updated to automatically switch the MLSSA RCAI into impedance mode. This feature allows you to automatically switch between T/S measurements of driver parameters and normal acoustic frequency response measurements using a microphone. Many other new software features were added to MLSSA and MLSSA SPO. A list of all new features with full descriptions can be found in the.
This upgrade can be and installed at no charge by owners of MLSSA versions 10WI or higher. The MLSSA, MLSSA SPO and MLSSA RCAI reference manuals were also been updated and are now available online in PDF file format. See below under Online Documentation.
Note that Acrobat Reader's search function can be used to quickly search the PDF manuals. MLSSA 2000 Mothercard Upgrade The MLSSA 2000 mothercard features a pink-filtered MLS output for improved SNR in the bass region. MLSSA 2000 mothercards are full-length ISA cards compatible with ISA bus speeds up to 16 MHz.
A MLSSA 2000 Mothercard Upgrade Kit is available to upgrade your existing hardware and software to the latest version. For details and other features of the MLSSA 2000 mothercard upgrade, please see the brochure.
Theory of Upsampled Digital Audio Upsampling has become a boon to audiophiles who hear significant and sometimes dramatic improvements in the sound quality of CDs played back through commercially available upsampling digital-to-analog conversion products. A great deal of confusion surrounds this advance in digital audio reproduction. The paper published here defines the process of upsampling and presents a scientific explanation of its effects upon digital audio sound quality. For the complete paper, see the Product Literature MLSSA is the industry standard loudspeaker measurement system and the MLSSA Speaker Parameter Option (SPO) is the industry standard for measuring the Thiele-Small parameters of loudspeaker drivers.
MLSSA and SPO both include QC (Quality Control) PASS/FAIL functions for high-speed automated production line testing of loudspeakers and drivers. Other important applications of MLSSA include speech intelligibility measurements according to IEC 60268-16 Third Edition via the Speech Transmission Index (STI) and Rapid Speech Transmission Index (RASTI) as well as room acoustics measurements according to ISO 3382. For details, see the MLSSA Acoustical Measurement System and MLSSA Speaker Parameter Option brochures below. Note also that the microphones listed here are sold only in combination with MLSSA or to those who have previously purchased MLSSA from DRA Laboratories. Ordering Information For current prices and ordering information please contact DRA Laboratories at Online Documentation The following PDF files include a navigation bar and a linked table of contents. They can be searched using Adobe Acrobat Reader version 5.0 and above. DRA Laboratories 4587 Cherrybark Court Sarasota, FL USA Tel +1 941-866-0632 Revised May 28, 2009.
Measurements of the values that describe sounds and noises in terms of their intensities and various qualitative features (such as their spectra or the growth and decay of the sound over time). The principal values measured in acoustics are sound pressure, sound intensity, vibration velocity and particle displacement, the frequency and period of vibrations, propagation velocity, damping factor, and others. The most important characteristic is sound pressure, because the human ear responds to the sound wave pressure. Acoustic measurements are closely linked with electrical measurements and are performed chiefly with electronic measuring instruments. The difficulties experienced in acoustic measurements are due to the complicated spatial distribution of the acoustic values in rooms as well as the variability of sounds and noises over time. For sound pressure measurements a standard microphone is used in air or a hydrophone in water.
The receiving portion of these instruments transforms the received acoustic signals (pressures) into proportional electric voltages, which are then fed to the input of amplifiers with indicators for readout. A sound-level meter is used for measuring various noises.
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An important part of acoustic measurements is building and architectural acoustics—the measurements of the sound isolation of partitions and coverings and of the sound absorption factor of different structural coverings (such as plaster, upholstery, and floors). There are other kinds of acoustic measurements such as measurements of waveguide characteristics, tests of acoustic instruments for communication and broadcasting (that is, of acoustic transmitters and receivers), tests of tape recorders and record players, and of telephone communication. Of special importance is the category of subjective measurements of the hearing sensitivity of people and its deviations from the norm (audiometry).