Acoustic and Audio Equipment Reference Materials
Reference Articles 1 - 100 of 101
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MEMS Ultrasonic Sensor Solution Enables Intelligent Cabin CPD System
Description: Child Presence Detection (CPD), an important safety measure for children in cars, is a system that uses various sensors to sense children in the car and send a notification warning to the driver. ...
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Association between community noise and children's cognitive and behavioral development: A prospective cohort study
From: Convergence InstrumentsDescription: Noise exposure has been associated with adverse cognitive and behavioral outcomes in children, but evidence on longitudinal associations between community noise and child development in low- and ...
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Space-time characterization of community noise and sound sources in Accra, Ghana
From: Convergence InstrumentsDescription: Urban noise pollution is an emerging public health concern in growing cities in sub-Saharan Africa (SSA), but the sound environment in SSA cities is understudied. We leveraged a large-scale ...
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ACAM_64 Theory of Operation
From: Convergence InstrumentsDescription: Because the processing is implemented digitally, a few features are possible that cannot be done in an optical camera ...
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Piezoelectric Speaker Introduction
Description: Piezoelectric speaker is developed based on the reverse piezo-electrificatio n effect. As a brand new branch of speaker family, its superior high pitch quality, ultra-thin structure, and low power ...
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Learn about Ultrasonic Transducers
From: Transducers USA, Inc.Description: Ultrasonic transducers send and receive waves for many types of sensing. They convert energy into high frequency sound waves in the ultrasonic range. These sound waves are then focused on a target and ...
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Success Story: Technical Grammy Award
From: SCHURTER IncDescription: The "Grammy" is the "Oscar" of the music industry since 1959. In 1994, a "Technical Grammy Award" has also been presented. This goes to people who have made outstanding contributions to the ...
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Convergence Instrument's Technology Supports Great Santiago Noise Maps in Chile
From: Convergence InstrumentsDescription: What is a noise map? ...
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Using MEMS Microphone in Sound Level Meters
From: Convergence InstrumentsDescription: A measurement-class microphone such as a 0.5 in ICP microphone is typically a sizable part of the cost of a sound-level meter (SLM). That high instrument cost in turn constrains applications such as ...
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A Quick Guide for Stopping Industrial Noise
From: Sonic-ShieldDescription: Commercial and industrial machinery is necessary for running large buildings, institutions and businesses. This machinery and its processes are comprised of various noise sources that can negatively ...
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Acoustical Testing Can Lead to Improvements in Productivity and Lower Costs
From: Sonic-ShieldDescription: Maintaining suitable noise levels in a manufacturing or industrial environment often proves challenging as the noise output from machinery can be deafening. Thankfully, acoustical testing - and ...
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Commercial Soundproofing
From: Sonic-ShieldDescription: If you are a business owner it is important to understand the noise ordinances that your community has in place as well as the decibel levels that affect stress and productivity. Different communities ...
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Efficient Implementation of Random Pressure Fields with the Finite Element Method
From: Sonic-ShieldDescription: An efficient technique is developed for use with the finite element method for the vibration prediction of structures subjected to random, spatially distributed excitation pressure fields. User input ...
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How To Solve For Commercial Office Noise Issues
From: Sonic-ShieldDescription: At Sonic-Shield, we use both sound barrier and/or sound absorption materials to dampen or completely deaden noise from a variety of sources. Soundproofing for commercial buildings requires ...
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Industrial & Manufacturing Soundproofing
From: Sonic-ShieldDescription: Industrial noise is one of the labels we use to help us start the process of solving your noise problems. While it is a term used in the industry, industrial noise is a label we use in our process and ...
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Machinery in Plants Expose Workforce to Harmful Levels of Noise
From: Sonic-ShieldDescription: Every year, approximately 30 million people in the United States are exposed to hazardous noise in the workplace which may result in temporary or permanent hearing loss, create physical and ...
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Solving Manufacturing Noise Problems
From: Sonic-ShieldDescription: All types of manufacturing facilities - recycling plants, auto manufacturers, power generation plants, food manufacturers to name but a few, are using machinery that can be linked to harmful and ...
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Sound Absorber FAQs
From: Sonic-ShieldDescription: Sound Absorber FAQs are presented to help you understand the different types of products available and their effectiveness. ...
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Sound Barrier/MLV-FAQs
From: Sonic-ShieldDescription: This Sound Barrier/MLV-FAQs page is our attempt to dispel any fiction about Mass Loaded Vinyl (MLV) and give you the facts in a FAQ format. ...
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Soundproofing a Restaurant
From: Sonic-ShieldDescription: We received a call from a popular casual dining restaurant, that had a game room toward the back of their establishment, which was in a strip mall. Noise from the game room was bleeding into the ...
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Soundproofing Engineering Principles That are Out of This World
From: Sonic-ShieldDescription: It's likely that when you think of 'soundproofing,' you think of residences, manufacturing or even commercial venues for concerts and events. But what few know is that NASA - yes, that NASA - and its ...
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The Manufacturer's Guide to Acoustical Curtains
From: Sonic-ShieldDescription: All types of manufacturing facilities - recycling plants, automotive manufacturers, power generation plants, food manufacturers and more - use machinery that can be linked to harmful and disruptive ...
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What You Need To Know About Noise Pollution & Safety
From: Sonic-ShieldDescription: At this exact moment, you're hearing things - whether you realize it or not. Maybe it's the "quiet" din of a busy office, your dog playing with a toy in the other room, airplanes overhead or sirens in ...
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Operation of a MEMS-Microphone Sound-Level-Meter in Dusty Environments
From: Convergence InstrumentsDescription: MEMS microphones, such as those used in the Noise Sentry RT line of integrating sound-level meters, have definite advantages compared to traditional electrostatic microphones ...
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Acoustical Interactions
From: Sonic-ShieldDescription: Soundproofing fundamentally involves the means by which we can control the propagation of sound through acoustical interactions. It is therefore important to understand how acoustical interactions ...
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Flanking Noise Through a Wall
From: Sonic-ShieldDescription: This application note is about Flanking Noise Through a Wall. In a previous application note, Sound Transmission Through a Wall, we discussed how sound is transmitted through the structure of a wall. ...
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Fundamentals of Sound and Hearing
From: Sonic-ShieldDescription: Sonic-Shield believes an educated customer is our best customer, therefore we want to talk with you about the fundamentals of sound and hearing in order to help you understand your particular noise ...
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How to Combine Decibels for Effective Soundproofing
From: Sonic-ShieldDescription: For effective soundproofing solutions one has to know how to combine decibels. First and foremost, sound from the loudest source will always dominate the overall sound level. The human ear is capable ...
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Improving Room Acoustics
From: Sonic-ShieldDescription: Improving room acoustics is as much of a challenge as providing soundproofing solutions. In a previous application note, Room Acoustics Testing and Analysis, we discussed the performance of a ...
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Interior Sound Transmission
From: Sonic-ShieldDescription: Interior sound transmission is a very common problem. Noise comes from anywhere and finds a way to get through any number of structures, windows, doors, duct work and floors and ceilings to disturb ...
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Noise Transmission Paths
From: Sonic-ShieldDescription: Noise, or unwanted sound, disturbs our peace and quiet in all aspects of our lives. Sound energy can be transmitted through several different media, including gases, liquids and solids. This enables ...
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Sonic-Shield Explains Sound Barriers vs. Sound Absorption
From: Sonic-ShieldDescription: Sonic-Shield explains sound barriers vs. sound absorption. Sonic-Shield offers a full range of soundproofing products and develops customized soundproofing solutions to solve even the most demanding ...
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Sonic-Shield's Soundproofing Glossary
From: Sonic-ShieldDescription: Sonic-Shield's Soundproofing Glossary is designed with the average consumer in mind. Sonic-Shield believes that an educated customer will be our best and most loyal customer. To that end, we have ...
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Sonic-Shield's Soundproofing Process
From: Sonic-ShieldDescription: The development of an effective soundproofing solution starts by first identifying the noise that is offensive, then determining the noise transmission path(s) and measuring the acoustic ...
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Sound Level Meters
From: Sonic-ShieldDescription: A necessary first step in developing an effective soundproofing solution involves the measurement and characterization of the noise frequently accomplished at least in part with sound level meters. ...
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Sound Transmission Through a Wall
From: Sonic-ShieldDescription: Sound transmission through a wall is just one of the ways that sound is transmitted. Soundproofing fundamentally involves the means by which we can control the propagation of sound. This application ...
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Soundproofing a Standby Generator
From: Sonic-ShieldDescription: Soundproofing a standby generator is becoming a more frequently encountered challenge when it comes to soundproofing. Standby generators have become increasingly popular in recent years with home and ...
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Soundproofing a Wall
From: Sonic-ShieldDescription: In previous application notes, Sound Transmission Through a Wall, and Flanking Noise Through a Wall, we discussed how sound is transmitted directly through the structure of the wall and indirectly ...
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Understanding Acoustics
From: Sonic-ShieldDescription: Understanding acoustics, specifically indoor acoustics is important for your interaction with a soundproofing company. Three important acoustical concepts must be understood: decibels (dB), Sound ...
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Noise Curves
From: NTi Audio AGDescription: Noise curves specify the acoustic ambient noise in an indoor environment. The unoccupied room is measured to produce a single maximum value across the complete sound spectrum. This value is used to ...
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Testing safety critical PA systems in a nuclear power plant
From: NTi Audio AGDescription: This article describes considerations and the implementation of retrofitting a fully-automated procedure, for testing a public address system, into a safety-critical environment (a nuclear power ...
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Application Note - Acoustic Transducer Testing with dScope Series III
From: Spectral MeasurementDescription: The requirements for acoustic testing are quite unique within the field of audio analysis, and testing requires particular care to ensure good rejection of unwanted reflections (echoes and ...
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Application Note - Audio Multi-tone Testing using FFT Analysis
From: Spectral MeasurementDescription: Audio analysis with dScope Series III using synchronous multi-tones is fast and powerful. It allows many parameters of the equipment under test to be measured simultaneously, using a single stimulus ...
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Application Note - Broadcast Audio Testing with dScope Series III
From: Spectral MeasurementDescription: The radio broadcast signal chain is a long and complex path involving electro-acoustic transducers, mixers, storage media, interface channels, signal processing and more. Each process within this path ...
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Application Note - FM Multiplex with RDS
From: Spectral MeasurementDescription: The ability to generate an FM Multiplex (MPX) for stereo FM radio reception testing is made possible by the extended audio bandwidth of the dScope Series III audio analyzer. This application note is ...
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Application Note - Impulse Response Testing with dScope Series III
From: Spectral MeasurementDescription: dScope Series III Version 1.2x releases feature a set of tools for measuring impulse responses and derived parameters. Impulse response analysis is a powerful tool which can be used to measure ...
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Application Note - Rapid Bin-Centres Frequency Response Analysis
From: Spectral MeasurementDescription: The dScope Series III is a powerful and comprehensive audio analyzer platform, designed to give the user a great deal of flexibility in analyzing audio signals and carriers, making the system ideally ...
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Performance Challenges in Audio Converter Design - Ian Dennis (Prism Sound)
From: Spectral MeasurementDescription: The habitat of audio converters is ever-changing. Early converters were built into stand-alone digital audio equipment. Later, they were built as stand-alone conversion devices with dedicated digital ...
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Sonic Differences Between Identical CDs
From: Spectral MeasurementDescription: The Numerically-Identical CD Mystery: A Study in Perception versus Measurement The authors investigate claims that numerically-identical CDs can sound noticeably different on replay. It has been ...
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Environmental Noise Control Trends in Instrumentation
From: Convergence InstrumentsDescription: 1 Noise Control Throughout the world, there is renewed effort to control noise levels in residential areas. High noise levels interfere with sleep and various human activities. In the long run it does ...
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Using Acoustic Beamforming for Pass-By Noise Source Detection
From: NIDescription: This application note discusses a technique known as beamforming for determining noise location of passing vehicles. The technique has several challenges including simultaneous acquisition of a large ...
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Characterizing Cabin Noise
From: PCB Piezotronics, Inc.Description: Directives to assess and minimize cabin noise have become a top priority for the aerospace industry. From large commercial jets, to helicopters, to small propeller aircraft the need is the same, which ...
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Do You Hear That?
From: Mouser ElectronicsDescription: Audio. It's hard to imagine a world without sound. It's amazing how much sound enhances our viewing experience. In the U.S. alone, the average home has 2.9 television sets, with 56% owning at least ...
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Controlling Sound Level- Electronic Method
Description: For piezoelectric type audible alarms, the larger the voltage signal applied to the piezoelectric transducer, the louder the sound level. This property can be used to electronically control the sound ...
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Controlling Sound Level- Mechanical Method
Description: These days, it seems that we are constantly being alerted with everything from beeps to buzzers. Personal Computers, virtually all types of home appliances, cars, farm implements, golf carts, medical ...
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Acoustic Myths & Realities: The Egg Carton Test
Description: Since entering the acoustics arena in the seventies, we have heard many stories over and over. One of these is that the acoustic foams are no more than a fancy packaged version of egg cartons. After ...
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Acoustic Myths and Realities: Carpet on the Wall
Description: In the Disco Days of the late 1970 s, floor carpet was often used in studios as acoustical wall treatment. Orange shag was a particular favorite. We had an independent lab test Thick Pile Carpet ...
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Acoustical Myths and Realities (.pdf)
Description: This article was written for the October 2007 issue of Religious Product News. It covers misconceptions about how acoustical materials work and interact with a sound system. Topics include isolation ...
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Acoustics for the Church Studio (.pdf)
Description: This article was published in the July 2007 issue of Technologies for Worship Magazine. The control room serves to monitor and evaluate the recording and for this reason it is critical that it be ...
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Acoustics Then and Now (.pdf)
Description: This article was written for the November, 1999 issue of ProSoundNews. It traces growth in awareness of acoustics from our first showing anechoic wedge foam at AES New York in 1979 through the ...
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An Acoustical Balancing Act (.pdf)
Description: This article appeared in the January 2006 issue of Church Production. Churches share the same laws of physics with recording studios and concert halls, but must apply them differently. Achieving a ...
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Churches Should be Mindful of Sound Control from Above (.pdf)
Description: This article form the June 2007 issue of Church Executive discusses ceiling treatments. Reverberation reduction is essential to speech intelligibility. Retaining a proper level of reverberation is ...
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Cost-Effective Acoustical Treatments for your Home Studio (.pdf)
Description: This article was written for the Winter 2000 issue of Disc Makers Pro Studio Edition at the request of Keith Hatschek. It was later incorporated into his book The Golden Moment, Recording Secrets from ...
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Creating a Home Recording Environment (.pdf)
Description: This article from the August 2004 issue of Singer Magazine discusses the noise isolation and sound shaping concerns for studios. Recording environments in large, dedicated facilities as well as ...
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Don't Correct the Room, Build It Right (.pdf)
Description: This article was written at the suggestion of Custom Retailer for their October 2003 issue. A previous article had implied that room acoustics could be fixed with expensive equalizers. Here it is ...
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From Start to Finish - Safe and Sound Acoustics (.pdf)
Description: This was written at the request of Facility Safety Management for their December 2005 issue. Noise control is essential to hearing preservation and speech intelligibility in safety systems. Heavy mass ...
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Home Project Studio (A Four Part Series) (.pdf)
Description: This series article was written in 2007 for Disc Makers Pro Studio Edition e-Newsletter. It illustrates what can be done to create a professional working environment for recording in residential ...
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POP Art - There's More to Acoustics than the "Plain Old Panel" (.pdf)
Description: This article was written for the March - April 2003 issue of Your Church. It describes the construction, function and uses of various acoustical sound absorbing panels starting with the fabric covered ...
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Project Studio Project, Part One (.pdf)
Description: This article was written for the April 2005 issue of Singer Magazine (now Singer & Musician) by their publisher and Editor-in-chief Robert A. Lindquist. Acoustics First provided construction ...
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Project Studio Project, Part Two (.pdf)
Description: This article is the second part of a series written for the June 2005 issue of Singer Magazine, now Singer & Musician, by their publisher and Editor-in-chief Robert A. Lindquist. This final ...
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Sound Advice for Churches (.pdf)
Description: This profile of Acoustics first appeared in the September 2005 issue of Your Church Magazine. It describes how the company can provide a basic analysis of the sound of a sanctuary, multipurpose room ...
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Studio Acoustics 101: It's the Room (.pdf)
Description: This article was written for the September 2008 issue of Radio World and reprinted in their 2009 Sourcebook. Moving from a world class recording facility, where noise control and acoustics were ...
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Tales from the Input Side (.pdf)
Description: This article was written for the February 2002 issue of Home Toys. Listener may hear sounds not on a record. Recording engineers can trick the ear into hearing sounds beyond what is recorded. The room ...
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What is the Difference Between Microphone Types?
From: Prosig USA, Inc.Description: We're often asked what is the difference between free field microphones, diffuse field microphones and pressure microphones. For a run-of-the-mill 1/2" inch microphone the short answer is nothing. ...
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Comparison Between Sound Intensity Probes and Acoustic Cameras
From: Prosig USA, Inc.Description: Sometimes we are asked about the differences between an acoustic camera and a sound intensity probe and which of the two is better for a particular application. There is no straightforward answer as ...
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Finding Safe Harbor for Electronic Sounding Devices (.pdf)
From: Challenge ElectronicsDescription: Just about any mariner knows the power and appeal of the open air and salty sea. It's a phenomenon that goes back long before mankind even dreamed of mechanical flight. Yet, despite his long-term ...
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Practicing Sound Medicine
From: Challenge ElectronicsDescription: Audible devices are playing an increasingly critical role in modern healthcare. Unfortunately, device manufacturers may not be aware of all the options available to them when it comes to sound ...
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Sonar Listens to Material Properties
From: COMSOL, Inc.Description: During WWII, SONAR was used primarily to detect submarines; today these techniques are used to look for undersea objects such as shipwrecks and for measuring fish abundances and distributions. SONAR ...
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When to Choose the Directional or Noise Canceling Microphone?
Description: The main difference of the appearance between the directional/ noise canceling and the omni-directional microphone is that the former one has air holes on the bottom. The air holes also receive sound, ...
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The sound which microphone received is too low
Description: Normally, the higher the impedance is, the better the sensitivity will be. However if the impedance is too high to get enough voltage/current, the high frequency response may get worse. Input higher ...
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The sound which microphone received is too low
Description: Normally, the higher the impedance is, the better the sensitivity will be. However if the impedance is too high to get enough voltage/current, the high frequency response may get worse. Input higher ...
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Broadcast FM Radio Tuner for Portable Applications
From: Silicon LabsDescription: This document applies to Si4702/03-C Firmware 19 and greater. Worldwide FM band support (76-108 MHz). Digital low-IF receiver. Frequency synthesizer with integrated VCO. Seek tuning. Automatic ...
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Frequency Modulation (FM) Tutorial
From: Silicon LabsDescription: Edwin H. Armstrong, known as one of the founding fathers of radio technology, invented the superheterodyne radio receiver in 1918 and frequency modulation (FM) in 1933 [1]. These two concepts, along ...
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Omnidirectional and Unidirectional Microphone
Description: Imagining that a microphone is set in the center of a sphere, and the sound is generated on the surface of the sphere. Because the sound waves are diffused and diffractive, the SPL which the ...
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The Difference Between the Speaker and the Receiver
Description: The basic structure of the speaker and the receiver is almost the same; the diaphragm generates the sound by the reaction upon the sound coil and magnet. ...
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How To Choose A Buzzer
Description: There are many different kinds of buzzer to choose, first we need to know a few parameters, such as voltage, current, drive method, dimension, mounting type, and the most important thing is how much ...
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Piezo Buzzer & Magnetic Buzzer
Description: A piezo buzzer generates sound because of the piezoelectric effect from the piezoelectric ceramic which drives the metallic diaphragm to vibrate. A magnetic buzzer is based on the electromagnetic ...
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Test condition makes the impact on the sensitivity of microphone
Description: Generally speaking, the sensitivity of the microphone will increase when we raise the impedance at 2.2K of RL, the results as the graph 1 & 2. The sensitivity also rises if we give higher voltage to ...
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The Difference Between The Self-Drive And External-Drive Buzzers
Description: Depend on the driving signal, the buzzer divide into self drive and external drive. However inner circuit/ no circuit, DC/ AC, and active/ passive are all mean the same. ...
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The Reason That Speakers Emit Noise
Description: To analyze the usage, there are a few reasons explain why the speakers emit buzz sound or noise: ...
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Microphone Array
Description: With the constant enlargement of the internet bandwidth, the internet video conference has become possible. However, the wide bandwidth does not mean high quality of sound. The consumers usually need ...
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The Key Point of Soldering and Assembling The Microphone
Description: The diaphragm of the microphone is a very thin mylar membrane, it is easily being contracted and distorted with the high temperature. Therefore, we can only use hand-welded method to process, and the ...
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About waterproof speaker
Description: Generally speaking, a paper diaphragm speaker is easily to have the problem of molding or distortion in a humid environment, and is certainly damaged in the water. On the other hand, the mylar ...
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The Advantages of the Electret Condenser Microphone
Description: Transform sound into electric signal- The best design in theory: The design of electret condenser microphones is based on the theorem that we use charging and discharging motion. ...
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The Buzzer has Noise
Description: When the sound which the buzzer generates is not a clear beep sound, we call it noise or broken sound. There are two possible ways to cause the noise. ...
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The Relationship between Watt and SPL
Description: Base on the premise that all the conditions are the same, if the drive circuit provides enough voltage, the speaker can generate higher sound pressure level. However, with the same voltage, but we use ...
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What Should I Do To the Noise?
Description: If the direct current mix with the alternating current signal, we will hear a stable level, low frequency and continual noise. We can lead the power to the microphone directly, or set a non-join ...
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Small Size Speaker but Generate Higher SPL
Description: n order to increase sound pressure level, we need to vibrate more air molecule by more power under unit time. For the two sizes speakers, the area of diaphragms of the 15mm speakers are around 176mm ...
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Basic Vocabulary in Acoustics
Description: The physical character of sound Sound: The pressure wave which is vibrated in the elastic medium. Wave: The presentation of passing the energy from one place to another place. ...
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The Advantages of the Rubber Holder
Description: Microphone is a component to receive the sound, therefore it is possible to receive any other sound which happens near the microphone at the same time, for instant, when we touch the casing; or the ...
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