Acoustic-X™ is software developed to assist in the optimization process of small-room acoustics. Its goal is to provide users with information that will allow them to make correct and intelligent choices to improve the sound quality of their space. In order to achieve this goal, Acoustic-X™ uses several software modules, each dedicated to individual acoustic calculation tasks. Reviews accissible via this site.
http://www.pilchner-schoustal.com/old/a … ftware.htm

Reflex Software: http://www.mjm.qc.ca/en/reflex.html

CARA SOFT: http://www.acousticsoftwarereviews.com

AURORA – Software auralisation on PC
Aurora is a suite of plugins for CoolEdit: the room acoustic impulse response can be measured and manipulated, for the recreation of audible, three-dimensional simulations of the space.
http://www.ramsete.com/Aurora/

Acoustic Software Resources 1
An extensive collection of liks to acoustics and audio software.
http://www.ecgcorp.com/velav/vldocs/software.html

Acoustic Software Resources 2
Some Audio, Acoustics, Circuit Board design and other links
http://staff.niagara.edu/mls/softsor.html

Acoustic Software Resources 3
Several additional links to all branches of Acoustic Software. However most can be found via Acoustic Software Resources 1.
http://www.scientific-computing.co.uk/a … ftware.htm

Audio Toolbox Plus – TerraSonde
This is a hybrid of equipment and software. This equipment and software has won some Awards
http://www.terrasonde.com/

AudioTester (Shareware Eur 33.45, USD 28)
audiotestsystem: spectrumanalyzer,wavegenerator and oscilloscope with a soundcard.
http://www.sumuller.de/audiotester/

BEASY Acoustic Design
Professional software: Noise control and reduction, Architectural Acoustics, Environmental Acoustics, Sound propagation through sound absorbing materials, and much more.
http://www.beasy.com/products/acousticdesign/index.html

CARA 2.1 PLUS ($49.95 US Dollars )
The Windows software for audio and home theater enthusiasts! CARA calculates the acoustics of your room with 3D modeling of your sound room, loudspeakers, and listener locations. A test CD is also available at $19.95 or as total package at $64.95
http://www.rhintek.com/ e

CATT-acoustic
This is professional room-acoustic software. Also has FIReverb suite. Expensive
http://www.catt.se/ e

CLARA (ca 350 Euros)
Saint-Gobain Acoustic Comfort Software (Saint-Gobain Isover/Saint-Gobain Glass). Select and evaluate acoustically different construction systems which meet the requirements of European comfort classes.
http://www.isover.com/gb/frameset.asp?b … rubrique=5

CLIO electrical and Acoustical tests
PC-based system for electrical and Acoustical measurements. CLIOwin implements three different measurement techniques: MLS (Maximum Length Sequences), Sinusoidal Sweeps and FFT Averaging.
http://www.mclink.it/com/audiomatica/clioman.htm

COMET Acoustics Software (Professional = expensive)
Collins & Aikman Launches COMET 5.0 Acoustic Software. COMET is a computational simulation tool for comprehensive vibration and acoustic prediction for the automotive, aerospace and other high tech industries. COMET utilizes various analytical techniques to accurately predict the transmission, radiation and scattering of acoustic waves and their interaction in a variety of media including fluids, foams, and solids.
http://www.colaik.com/default.asp

EASE v3.0 for Windows
EASE v3.0 is an acoustic simulation software program designed for the Windows operating system that provides sound system designers an invaluable tool for predicting the performance of a sound system in a given venue. The software program is primarily geared toward large-room acoustics (churches, stadiums, arenas, theaters, etc.) and includes numerous acoustical design and analysis tools for Contractors, Engineers and Acoustical Consultants.
http://www.jblpro.com/ease/

ETF 5 (MLS software) – Acoustisoft (ca 150$)
ETF software is a highly accurate PC based acoustic measurement system designed to meet the needs of both hi fi enthusiasts and professionals. Two channel MLS measurements provide accurate results with even low cost standard pc sound cards.
http://www.etfacoustic.com/index.html

Fluidyn acoustic software
Professional software for environmental and room acoustics.
http://www.fluidyn.com/Home/Index_Home.htm

HpW-Works the Measurement System (69 – 300$)
HpW Works is a complete software based measurement system for the Intel HW platform. Analyzes a DUT using a sound card, wave files and text (ASCII) files. Various signal analysis are performed like RMS, DR, THD, THD-N and more. Check the customer list.
http://www.hpw-works.com/

INSUL Marshall Day acoustics
INSUL is a quick and accurate tool for predicting the sound insulation of walls, floors and ceilings. Price ca 1000 $
http://www.insul.co.nz/

MLSSA Acoustical Measurement System
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 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 on the site..
http://www.mlssa.com/

NEMPEE Acoustics Software
a tool for acoustics engineers and architects to assist in providing maximum acoustical performance in building design. For example, an auditorium requires a specific design in order to reflect sound. This program can set up everything precisely and generate reports on the acoustics of a room. It considers surface area, building materials, and volume.
http://www.nempee.com/AcouSoft.htm

Nicolet technologies
Some professional, presentation and analysis software, also have hardware.
http://www.niti.com/software.html

ODEON – Room Acoustics Software
Professional program (expensive). This site includes lots of interesting publications in .pdf format. August 2001 an agreement has been made with Brüel & Kjær to become worldwide sole distributor of ODEON.
http://www.dat.dtu.dk/~odeon/

PC Audio/Visual Technical Web Site. VERY GOOD LINKS
Audio Testing-Related Hardware and Software Links. It lists the most common acoustic programs, known in the Audio, Studio world. Also includes tests on sound cards.
http://www.pcavtech.com/links/index.htm

Ramsete in 3 editions (Lite, Classic & II)
Room acoustic modeling – Ramsete is the first publicly available software based on the Pyramid Tracing computing scheme, which is quite different from traditional Ray Tracing or Cone Tracing schemes.
http://www.ramsete.com/

SEAM acoustic and vibration prediction software
Cambridge Collaborative’s SEAM software provides a methodof analysis that is particularly well suited for studying the dynamic response of complex structures at high frequencies. SEAM is used to predict interior noise and vibrationin aircraft, automobiles, and construction equipment cabs as well as the radiated noisefrom ships and the vibroacoustic environments for spacecraft. Other applications includemachinery noise, industrial noise, and building acoustics.
http://www.seam.com/

SIA Software – Smaart Live & Acoustic Tools
SmaartLive provides a practical and affordable PC-based implementation of a dual-channel FFT analyzer designed specifically for audio professionals. Acoustic Tools include lots of possibilities.
http://www.siasoft.com/smaart.html

SOPRAN (SOund particle Programme for Room Acoustics and Noise immission)
developed at the Fraunhofer Institute of Building physics IBP, allows the room acoustic design of auditoria (concert halls, theatres, multipurpose halls) and workplaces (factory buildings, open-plan offices).
http://www.ibp.fhg.de/rata/en/sopran-e.html

STx – Austrian Academy of Sciences
There is a FREE Real Time Analyser and a Trial version of STx itself. STx is the Windows version of the well-established S_TOOLS workstation for acoustics, speech and signal processing, which was first developed under DOS using the AT&T DSP32 signal processor card. STx now runs on 600 MHz PC systems equipped with Accelerated Graphics Port (AGP) cards and standard sound cards.
http://www.kfs.oeaw.ac.at/software/stx_download.htm

Sample Champion – PureBits (ca 100 – 500 Euro)
Professional Software Tools Audio Analysis and Processing. Sample Champion is an accurate and easy to use audio measurement software. It has been designed for acoustical technicians, sound engineers, scientists and students. With this software you’ll be able to easily perform Impulse response measurements, FFT analysis and much more.
http://www.purebits.com/index.html

Speaker Workshop FREEWARE
Speaker Workshop – test and design your own loudspeakers
http://www.audua.com/

Spectra Series software – MLS software - ST SPECTRA Sound Technology
SpectraLab, SpectraPro, SpectraPlus, etc. Several programs available in in different price ranges. The side also includes acoustic Test and Measurement PC based hardware and equipment.
http://www.soundtechnology.com/download-center.htm

Spectrafoo for MAC computers – Metric Halo Labs
SpectraFoo provides standards-based level metering, high-speed, high-resolution spectral analysis, the unique Phase Torch, correlation metering, triggerable waveform display, power balancing and a variety of power, envelope and spectral histories and phase analysis on any number of input or output channels. The SpectraFoo range is absolutely essential for broadcast and critical mixing & mastering.
http://www.mhlabs.com/products/

Spectrogram v 5.0.8
FREEWARE: Spectrogram can provide either a scrolling time-frequency display or a spectrum analyzer scope display in real time for any sound source connected to your sound card. Spectrogram allows unlimited recording and playback of the sounds from the audio spectrum display and can provide very high resolution spectrum analysis of wave files with a wide choice of frequency bands and frequency resolution and either linear or logarithmic frequency scales.
http://www.hitsquad.com/smm/programs/SPECTROGRAM/

Spectrum Analyzer v2.0 BETA FREEWARE
This small program is intended to measure the frequency response of a listening room with the aid of a regular computer. It records short sound sequences, performs a FFT then displays a cute diagram. The site also includes: Implementing Reverberation Algorithms with Matlab. These files are dedicated to the generation of artificial sound reverberation.
http://homepages.spider.lu/holzem/#

Steve Ekblad’s Free Audio Software Page + On-Line Audio Tools
A huge list of interesting things. Thanks to several manufacturers for providing a valuable resource for the hobbyist by providing these programs for a no-cost-trial [read shareware or demo] to the end user or in some cases totally free of registration fee requirements [freeware]!
http://www.wssh.net/~wattsup/audio/

The PC AV Tech Brings You:
Here is a web site built using CoolEdit and SpectraLab to perform technical tests published on the site.:
http://www.pcavtech.com/index.htm

ULYSSES Acoustic Design and Simulation Software – ca 1000$
ULYSSES© was developed with the intention to be a very fast, precise and really easy to use acoustic calculation, simulation and sound system design tool for our own consulting business. It features true 3-D CAD-based calculation, simulation and design routines for room acoustics and sound system design.
http://www.ifbsoft.de/

Visual Ears – KB Acoustics (ca 95 $)
Visual Ears, is an easy to use computer program that, through mathematical simulation, will help you find a “listening sweet spot” which minimizes the effects of standing waves (20-200Hz) and boundary reflections (20-500Hz). Visual Ears can handle rooms with sloped/cathedral ceilings and accomodates most speaker designs including sub/satellite systems. Read also the linked pages to the very positive test reports in Soundstage en Audiophilia magazine
http://www.kbacoustics.com/visualears/index.html

WinMLS – software for acoustics, vibrational & audio measurements
When visiting the site, you’ll see no typical commercial site, but this is professional software. Is available in cheap lite until professional expensive versions. Look at the Links page for references. Note from Eric: MLS measurement methods can have extreme advantages for insulation measurements by excluding background noise (equaling extended dynamic range).
http://www.nvo.com/winmls/door/

Dirac  Catt  Ulysess Arta

Audio Precision

AUDIO PRECISION ATS-2
October 2003—This PC-controlled audio analyzer features analog and digital inputs and outputs; generation of test signals for both analog and digital devices; multifunctioned audio analysis/spectrum analysis/multitone analysis/harmonic analysis; and a full complement of graphing and report options. ATS-2 puts a broad set of capabilities and high measurement performance into a lightweight, compact and affordable general-purpose instrument. www.audioprecision.com

Aislar supone impedir que un sonido penetre en un medio, o que salga de él. Por ello, para aislar, se usan tanto materiales absorbentes, como materiales aislantes. Al incidir la onda acústica sobre un elemento constructivo, una parte de la energía se refleja, otra se absorbe y otra se transmite al otro lado. El aislamiento que ofrece el elemento es la diferencia entre la energía incidente y la energía trasmitida, es decir, equivale a la suma de la parte reflejada y la parte absorbida. Existen diversos factores básicos que intervienen en la consecueción de un buen aislamiento acústico:

* Factor másico. El aislamiento acústico se consigue principalmente por la masa de los elementos constructivos: a mayor masa, mayor resistencia opone al choque de la onda sonora y mayor es la atenuación. Por esta razón, no conviene hablar de aislantes acústicos específicos, puesto que son los materiales normales y no como ocurre con el aislamiento térmico.
* Factor multicapa. Cuando se trata de elementos constructivos constituidos por varias capas, una disposición adecuada de ellas puede mejorar el aislamiento acústico hasta niveles superiores a los que la suma del aislamiento individual de cada capa, pudiera alcanzar. Cada elemento o capa tiene una frecuencia de resonancia que depende del material que lo compone y de su espesor. Si el sonido (o ruido) que llega al elemento tiene esa frecuencia producirá la resonancia y al vibrar el elemento, producirá sonido que se sumará al transmitido. Por ello, si se disponen dos capas del mismo material y distinto espesor, y que por lo tanto tendrán distinta frecuencia de resonancia, la frecuencia que deje pasar en exceso la primera capa, será absorbida por la segunda.
* Factor de disipación. También mejora el aislamiento si se dispone entre las dos capas un material absorbente. Estos materiales suelen ser de poca densidad y con gran cantidad de poros y se colocan normalmente porque además suelen ser también buenos aislantes térmicos. Así, un material absorbente colocado en el espacio cerrado entre dos tabiques paralelos mejora el aislamiento que ofrecerían dichos tabiques por sí solos.

La reflexión del sonido puede atenuarse también colocando una capa de material absorbente en los paramentos de los elementos constructivos, aunque estas técnicas pertenecen más propiamente al ámbito de la acústica.

En los espacios cerrados, el fenómeno preponderante que se ha de tener en cuenta es la reflexión. Al público le va a llegar tanto el sonido directo como el reflejado, que si van en diferentes fases pueden producir refuerzos y en caso extremos falta de sonido. A la hora de acondicionar un local, se ha de tener en cuenta, tanto que no entre el sonido del exterior (Aislamiento acústico).

Además, en el interior se ha de lograr la calidad óptima del sonido, controlando la reverberación y el tiempo de reverberación, a través, de la colocación de materiales absorbentes y reflectores acústicos.

En los espacios abiertos el fenómeno preponderante es la difusión del sonido. Las ondas sonoras son ondas tridimensionales, es decir, se propagan en tres dimensiones y sus frentes de ondas son esferas radiales que salen de la fuente de perturbación en todas las direcciones. La acústica habrá de tener esto en cuenta, para intentar mejorar el acondicionamiento de los enclaves de los escenarios para aprovechar al máximo sus posibilidades y mirar como redirigir el sonido, focalizandolo en el lugar donde se ubique a los espectadores.

Los griegos construyeron sus teatros, donde las obras dramáticas y las actuaciones musicales, en espacios al aire libre (espacios abiertos) y aprovecharon las propias gradas en donde se ubicaban los espectadores (gradas escalonadas con paredes verticales) como reflectores, logrando así que el sonido reflejado reforzase el directo, de modo que llegaban a cuadruplicar la sonoridad del espacio que quedaba protegido por las gradas. El tamaño de los teatros griegos, alguno de los cuales, gracias a sus propiedades acústicas, llegó a tener capacidad para 15.000 espectadores, no ha sido igualado.

Los romanos utilizaron una técnica parecida, no obstante, la pared de las gradas no era plana, sino curva, lo que permitía que se perdiese menor cantidad de sonido y lo focalizaban mejor hacia un mismo punto (Planteamiento similar al del reflector parabólico). Sin embargo los más grandes entre los romanos solamente tenían capacidad para unos 5.000 espectadores. La pérdida de las condiciones se debió en gran parte a que la orchestra, que el teatro griego servía para reflejar el sonido, en Roma fue el lugar que ocupaban los senadores y otros cargos, con lo que empeoraron las condiciones.

Actualmente (2005), se aprovechan los conocimientos que la cultura clásica nos ha legado y los recintos abiertos, se construyen con paredes curvas abombadas en forma de concha o caparazón. Los materiales utilizados tienen propiedades reflectoras para facilitar el encaminamiento del sonido hacia donde se ubican los espectadores. El problema es que no hay una respuesta en frecuencia no es uniforme y los graves llegan con mayor dificultad hasta el auditorio que los agudos.

Una señal de audio es una señal electrónica representada electricamente exacta de una señal sonora; normalmente está acotada al rango de frecuencias audibles por los seres humanos que está entre los 20 y los 20 000 Hz, aproximadamente (el equivalente, casi exacto a 10 octavas).

Dado que el sonido es una onda de presión se requiere un transductor de presión (un micrófono) que convierte las ondas de presión de aire (ondas sonoras) en señales eléctricas (señales analógicas).

La conversión contraria se realiza mediante un altavoz —también llamado altoparlante en algunos países latinoamericanos, por traducción directa del inglés loudspeaker—, que convierte las señales eléctricas en ondas de presión de aire.

Un sólo micrófono puede captar adecuadamente todo el rango audible de frecuencias, en cambio para reproducir fidedignamente ese mismo rango de frecuencias suelen requerirse dos altavoces (de agudos y graves) o más.

Una señal de audio se puede caracterizar, someramente, por su dinámica (valor de pico, rango dinámico, potencia, relación señal-ruido) o por su composición espectral (ancho de banda, frecuencia fundamental, armónicos, distorsión armónica, etc.).

Así, por ejemplo, una señal que represente voz humana (señal vocal) no suele tener información relevante más allá de los 10 kHz, y de hecho en telefonía fija se toman sólo los primeros 4 kHz. Con 2 kHz basta para que la voz sea comprensible, pero no para reconocer al hablante.