Webinars on Demand

Audio & Acoustic Basics
Evacuation Systems
Noise Measurement
Live Sound and Systems
Room & Building Acoustics
Quality Control
XL3 Acoustic Analyzer

Basics of Sound Level Measurements

Introduction to the essential aspects of sound level measurements. Explains terms such as Leq, frequency or time weighting, min/max level, measurement microphones, calibration etc.

Basics of Sound Level Measurements with the XL2

Useful Link from this Webinar

  • More information about the XL2 Sound Level Meter click here

Sound Level - Definition, Calculation, Practice

Covers the technical definition of sound pressure level, an explanation of how to sum sound levels from different sources, and more, together with practical examples.

Sound Level Defintion, Calculation and Practice


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Key Parameters of Sound Level Measurements

Key Parameters of Sound Level Measurements


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Acoustic Principles - Sound Propagation

The webinar introduces the basic principles of sound propagation, such as sound generation, near & far-field, reflections and absorption etc.

Acoustic Principles: Sound Propagation

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Basics of FFT Analysis

The presentation provides an introduction to the fundamental FFT calculation procedure, and explains the key parameters of this measurement method.

Basics of FFT Analysis

Useful Links from this Webinar

  • Website with overview on FFT Fast Fourier Transform
  • Website with additional information regarding FX100 Audio Analyzer
  • Website with additional information regarding XL2 Analyzer 

Advanced Topics of FFT Analysis

The webinar covers advanced aspects of FFT analysis, such as window functions, aliasing, averaging, display modes or calculations with FFT data.

Advanced FFT Analysis

Useful Links from this Webinar

  • Website with overview on FFT Fast Fourier Transform
  • Website with additional information regarding FX100 Audio Analyzer
  • Website with additional information regarding XL2 Analyzer 

Fast Frequency Response Measurement

A key performance parameter of most audio devices or acoustical installations is the frequency response. Therefore, it is of great interest to have a fast, yet accurate method at hand to measure this characteristic.

The webinar introduces the so-called Fast Pink Noise approach that is based on a special cyclic noise signal and a matching analyzer sampling period. This method avoids a long settling time, while allowing to acquire a stable and precise result with 1...4 seconds. The Fast Pink Noise approach is suited for characterizing the frequency response of electronic instruments as e.g amplifiers or mixers, but also acoustic devices such as loudspeakers.

Advanced FFT Analysis

Basics of Sweep Analysis

The webinar covers basic aspects of Sweep analysis, including the types of sweeps, parameters used, and presents a practical sweep measurement.

Basics of Sweep Analysis

Useful Links from this Webinar

  • Website with additional information regarding FX100 Audio Analyzer 

Advanced Topics of GlideSweep Analysis

The webinar covers the fundamental principle of GlideSweep, test parameters, the aspects of acoustic testing and more.

Advanced GlideSweep Analysis

Signal Generation with the MR-PRO

The webinar explains the key issues of audio signal generation, covers related issues such as Crest factor or level units, and provides practical examples.

Signal Generation with the MR-Pro

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Basic Sound Level Calculations

Can the formula shown be true? If so, under what conditions? In this webinar we will deal with easy-to-understand calculations and estimations from the audio and acoustics world. The knowledge imparted should help you to check results and measured values for their plausibility. As usual, we illustrate the theory shown with practical presentations.

Basic Sound Level Calculations

More Sound Level Calculations

In the course of our presentation on Basic Sound Level Calculations, we received many questions from our audience, e.g.

  • Is it possible to subtract a sound source from a known overall level?
  • How loud must a sound level be, compared to the ambient noise, to allow an accurate measurement?
  • What is the relationship of sound level vs. distance?
  • How can I calculate the Noise Exposure Level from an Leq measurement?

In this webinar, we will therefore respond to the raised issues and illustrate the theory behind, together with practical presentations.

More Sound Level Calculations

Acoustic Measurements - What can go wrong?

Are you sure that your measurement results are correct and accurate?
Have you excluded all potential impacts that might compromise the acquired data?

In this webinar we give an overview of the most common causes for inaccurate or even false results of electroacoustic measurements. We present some basic rules for a reliable test setup, the monitoring of the measurement itself as well as the subsequent analysis of the collected data to identify or exclude possible errors. In addition, we illustrate typical pitfalls and their effects in a practical presentation.

Acoustic Measurements - What can go wrong

Evacuation Systems: Configuration, Testing, Maintenance

Overview on how to verify an evacuation system with the XL2 Acoustic Analyzer.

Evacuation Systems: Configuration, Testing and Maintenance

Useful Links from this Webinar

  • Download the STIPA reporting tool from the XL2 Support website
  • Installed Sound & Evac Test Solution here.
  • 24/7 Evacuation System Monitoring here 

Speech Intelligibility

This webinar explains the measurement methods, workflow and result reporting for Speech Transmission Index for Public Address (STIPA) according to the latest standard IEC60268-16, edition 2011.

STIPA Measurements with the XL2, Basics


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Testing of Distributed Audio Systems

The webinar explains the basic test setup and strategy for 100V voice alarm systems. Furthermore, it covers the most common terms and parameters such as complex impedance, phase, power factor or the recommended test signal level and frequency.

Testing of Distributed Audio

 

Rating Level, for Industrial and Environmental Noise Assessments

The Rating Level Lr is used to assess the level of disturbance of industrial or environmental noise. Its evaluation begins with a measurement of the averaged sound pressure level LAeq. Penalties are applied for tonal and impulsive characteristics dependent on the time of the day.

The webinar explains how to objectively identify the relevant impulses and tones using both survey grade and engineering grade methods including FFT tonal assessment by the reference method, and how to calculate the applicable penalties.

Rating Level of Industrial or Environmental Noise with the XL2

Useful Links from this Webinar

  • More information about the XL2 Sound Level Meter here 

Advanced Principles of Sound Level Measurements

Explanation of the most frequently used sound level measurements, e.g. instantaneous level, equivalent level, maximum and peak level, percentiles etc.

Advanced Principles of Sound Level Measurements

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  • More information about the XL2 Sound Level Meter here

Analysis and Reporting of Long-Term SPL Measurements

Overview and explanation of the available software solutions for the analysis and documentation of long-term sound level measurements with the XL2.

Analysis and Reporting of long-term Sound Level Measurements

Useful Links from this Webinar

  • Download the reporting tools you need from the XL2 Support website
    - Data Explorer PC-Software (Advanced reporting)
    - Sound Level Meter (Live events, DIN15905, SLV, Vlaams Geluidsrapport)
    - Noise Exposure
    - STIPA

  • More information about the XL2 Sound Level Meter here

Solutions for Unattended Noise Monitoring

NTi Audio offers three solutions for unattended noise monitoring with the XL2 Sound Level Meter,

  • Managed mode
  • Gateway mode
  • Autonomous operation.

The webinar provides an overview on these three modes, explains the individual setup procedures and introduces the available options and accessories.

Unattended Noise Monitoring Solution with the XL2

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Collect and Present NoiseScout Data

An unattended noise monitor typically provides the sound levels of interest, plus additional information such as alarms or weather data. Consequently, the operator not only wants to reliably collect the relevant data, but also to present it to his colleagues, the customer or the public in an appropriate way.

The webinar explains the data collection methods supported by the NoiseScout platform and introduces various solutions for presenting the acquired information to different recipients.

How to collect and present NoiseScout Data

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Noise Analysis with Data Explorer

The webinar presents typical applications and best practices of noise analysis with the Data Explorer software.

Noise Analysis with the Data Explorer Software

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Noise Curves

Backgrounds and practical application hints on Noise Curve measurements with the XL2 Acoustic Analyzer.

Noise Curve Measurements with the XL2


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  • Read about the XL2 instrument you need to measure Noise Curves here

Preparing for Long-Term Sound Level Measurements

Step-by-step explanation of the settings essential to prepare and log a long-term sound level measurement. Includes hints on the practical use of the XL2 and hints on available post-processing tools.

Preparing for Long-Term Sound Level Measurements

Useful Links from this Webinar

  • More information about the XL2 Sound Level Meter here

Combining Sound Level Measurements into a Single Report

An often-recurring challenge in the analysis of long-term sound level measurements is the integration of various data sets into a single final report. For instance, several 24-hour recordings may have to be concatenated into one project, or the overall Rating Level be calculated based on a group of results. This webinar therefore explains the process of combining sound level measurements, explains the difference between the Day/Night vs. the Rating Level, and proposes a practicable procedure to create a single professional report from the project data.

Combining Sound Level Measurements into one single report

Useful Links from this Webinar

  • Find more information about Unattended Noise Monitoring here 

Sound Level Measurements in an Industrial Environment

Overview on professional sound level measurements in an industrial environment. Includes an explanation of basic measuring parameters and preparations, as well as practical application hints.

Sound Level Measurement in an industrial environment


Useful Links from this Webinar

  • More information about the XL2 Sound Level Meter here

How to Measure Sound Power

Sound Power is a standardized measure used to specify the total radiated energy per time of a noise-emitting device. It is usually measured in a room with known acoustic properties, in order to obtain accurate and reproducible results.

The webinar explains the basic requirements and procedures of a Sound Power measurement and introduces the related tools provided by NTi Audio.

How to measure the Sound Power

Introduction to Live Event Monitoring

Technical basics of sound level measurements, legal restrictions, as well as preparations and execution of live event monitoring including reporting tools.

Introduction to Live Event Monitoring with the XL2

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Live Event Monitoring with the XL2 Projector PRO

Live Sound Monitoring with the XL2 Projector PRO

Sound System Troubleshooting

When setting up a sound system, you frequently encounter problems such as no signal, hum or bad sound quality. The XL2 Audio Analyzer, together with the MR-PRO Signal Generator represent the perfect combination of handy tools that assist you to cope with these challenges.

The webinar covers the most common issues that may result in sound system flaws, be it for live sound or a permanent installation. We will explain efficient and quick approaches to identify and overcome such issues in practice.

Sound System Troubleshooting

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Reverberation Time Measurements

Introduction to Reverberation Time measurements with the XL2.

RT60 Reverberation Time Measurements with the XL2

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Measuring Sound Insulation

The webinar introduces the standard procedures for measuring the airborne and impact sound insulation, and provides additional information about the required equipment and the related terms and standards.

Measuring Sound Insulation with the XL2

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Acoustic Performance of Classrooms

The acoustic performance directly affects the speech intelligibility within a classroom, which in turn has a big impact on the learning success of the students.

The webinar therefore explains how to evaluate the acoustic performance, introduces typical target specifications, and introduces potential measures to improve a deficient classroom.

Acoustic Performance in Classrooms, XL2

How to test Smart Devices

Testing the quality of loudspeakers or microphones built into smart devices can be tricky, simply because there are no input or output connectors provided. The webinar presents a practical solution to this challenge, by introducing the concept of 'open loop' testing. This approach allows quick measurement of the most relevant acoustic parameters such as frequency response, sensitivity or audible distortions in an industrial environment.

How to test Smart Devices

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Audio Quality of Smart Devices

This webinar highlights the challenge of evaluating the Audio quality of the output of devices that have no connected input. The test signal first has to be stored on the Device Under Test (DUT) and then replayed by the DUT during the test measurement. Further, the Audio analyzer must trigger from and synchronize correctly to this incoming asynchronous signal.

Audio Analysis of Smart Devices

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How to test Digital MEMS Microphones

It is increasing common to find microphones being used in communication devices, consumer electronics, cars and household appliances; especially digital MEMS microphones. Typically, these are arranged as an array of multiple microphones. Thus the localization of a person speaking (Beamforming/Noise Cancellation) can be achieved.

From the point of view of the production test engineer this poses various challenges; the generation of a homogeneous sound field, the parallel processing of several channels, and the interpretation of the data obtained. This webinar therefore explains the basic operation of digital MEMS microphones and demonstrates strategies and approaches to testing them.

Testing of digital MEMS Microphones

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Basic Operation of FX-Control Software

The FX100 Audio analyzer offers an almost unlimited range of measurement functions, automation capabilities and result presentation modes. The proper understanding of these features, together with the ability to using them adequately plays a major role for the efficient operation of this instrument. The FX-Control software application is the key to set up the system and to execute the measurements according to your requirements. This webinar introduces the general concept of this application, explaining the various operation modes, data acquisition & logging as well as result visualization.

Basics of the FX-Control Software

Useful Links from this Webinar

  • Website with additional information regarding FX100 Audio Analyzer
  • Accessories for the FX100 Audio Analyzer
  • FX-Control Software - Regulators, Calculations Items and Pass/Fall Limits is covered in the webinar below 

FX-Control Software - Regulators, Calculation Items and Pass/Fail Limits

In addition to its standard range of audio measurement tools, the FX-Control software offers various features & options to meet the individual requirements of your application, e.g.

  • 'Regulators' that allow to adjust the FX100 Generator level or to optimize the Analyzer input range,
  • 'Calculation items' to execute either pre-defined or customized calculations with the acquired results,
  • the definition of tolerance bands and the application of limits to execute a Pass/Fail test.

The webinar explains these options in detail and shows, how they can be used to cover the specific demands of your project.

FX-Control Software - Regulators, Calculations and Tolerances

Useful Links from this Webinar

  • Website with additional information regarding FX100 Audio Analyzer
  • Accessories for the FX100 Audio Analyzer 

FX-Control Software - Data Logging & Reports

The FX100 Audio Analyzer, together with the FX-Control software offer a huge range of functions & features to execute virtually all tests & measurements required to cover your application. After completion of these measurements, the acquired data usually have to be integrated into a customized report.

The presentation therefore explains the available default features and options to collect, process and export the measurement results and auxiliary data.

FX-Control Data Logging and Reports

Useful Links from this Webinar

  • Website with additional information regarding FX100 Audio Analyzer
  • Accessories for the FX100 Audio Analyzer 

Amplifier Test Sequence

Introduction of the required equipment and steps that are executed for testing a D-class amplifier with the FX100 Audio Analyzer.

Amplifier Test Sequence with the FX100 Audio Analyser

Useful Links from this Webinar

  • Website with additional information regarding FX100 Audio Analyzer
  • Accessories for the FX100 Audio Analyzer 

FX100 Applications: Dealing with Power [W]

Explanation on how to adjust / measure the output power / power consumption of a device with the FX100 Audio Analyzer.

FX100 Applications: Power

Useful Links from this Webinar

  • Website with additional information regarding FX100 Audio Analyzer
  • Accessories for the FX100 Audio Analyzer 

How to Set Meaningful Pass/Fail Tolerances

The webinar proposes a step-by-step procedure to establish a reliable and relevant audio test for simple audio devices. It focuses on the required steps to set meaningful tolerance limits, even in cases where no test specifications are available.

How to set meaningful pass and fail limits

Useful Links from this Webinar

  • Website with additional information regarding FX100 Audio Analyzer 

How to Set Up a Loudspeaker Test

Presentation of a typical setup procedure for loudspeaker quality control with the FX100 Audio Analyzer.

How to set up a Loudspeaker Test with the FX100

Useful Links from this Webinar

  • Website with additional information regarding FX100 Audio Analyzer
  • Solutions website regarding speaker, driver and cabinet testing with the FX100 Audio Analyzer 

Interfacing the FX100 to External Devices

Introducing the alternatives to connect external devices such as a foot switch, stack light, barcode scanner etc. to the FX100 Audio Analyzer in the typical test configurations.

Interfacing with FX100 to external equipment

Useful Links from this Webinar

  • Website with additional information regarding FX100 Audio Analyzer
  • Accessories for the FX100 Audio Analyzer 

Microphone Testing with the FX100

Presenting typical test setups and procedures for measuring and verifying the performance of microphones with the FX100 Audio Analyzer.

Microphone Testing with the FX100 Audio Analysator

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Test Sequence Design Made Easy

Introduction to the design of consecutive FX100 test procedures by using the sequencer tool of the FX-Control software.

Test Sequence Design made easy

Useful Links from this Webinar

  • Website with additional information regarding FX100 Audio Analyzer 

Measuring Vibrations with the XL2

The webinar explains the fundamental vibration level measurements and units for Pass/Fail test applications. Furthermore, it shows the operation of the XL2 Vibration Meter and sensors in practice.

Measuring Vibrations with the XL2 Vibration Meter

Testing Active Noise Cancelling (ANC) Headphones

Headphones or earbuds with Active Noise Cancelling (ANC) are very popular, as they improve the user's comfort and listening experience. However, because of their behavior, it is more difficult to measure their performance.

In this webinar, we will present a solution to determine the active, passive and total noise reduction as a function of frequency, by using an FX100 Audio Analyzer and a headphone test fixture from Larson Davis with an ear simulator and ear cup.

Testing Active Noise Cancelling (ANC) Headphones

Sound Level Fundamentals

The presentation explains the fundamental principle of sound level measurements. It furthermore introduces standard parameters and answers frequently asked questions regarding weighting, averaging, etc.

Sound Level

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Practical Aspects of Sound Insulation Measurements

Sound insulation measurements require a high level of experience and application know-how. The webinar therefore focuses on practical aspects such as the correct positioning of the sound source and the microphone, the optimum workflow and other frequently asked questions.

Sound Insulation with the XL2 - Practical Aspects

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Latency Fundamentals and Measurement

Latency, i.e. the time delay of a signal on its way from the sender to the listener, is normally annoying and therefore unwanted. Controlling latency can improve the listening experience of an audience. The webinar discusses potential causes of latency in audio, and introduces best practices for measuring latency in different applications. Also, some practical demonstrations of latency measurements will be shown.

Latency Fundamentals and Measurements

Bluetooth Audio Device Testing

In recent years, a growing number of audio devices such as smartphones, headsets, TV sets, loudspeakers etc. allow communication via a Bluetooth interface. Consequently, there is a rising demand for manufacturers of these devices to reliably verify the quality of this communication during the production process.

This webinar covers the fundamentals of Bluetooth audio performance testing, explains the challenges, and proposes practical solutions.

Bluetooth Audio Device Testing

Calibration of Test Instruments

The presentation explains the relevant terms and standards related to the calibration of test instruments, such as adjustment, calibration, traceability or conformance. Furthermore, it describes the typical procedure of a device calibration, including RMA-handling, calibration execution and certification.

Calibration of test instruments

Testing Quality of Microphones

We have to apologize, this webinar is no longer available. However, you are welcome to download the presentation via the link below. If you have any questions, please do not hesitate to contact us.

Download here

Teaser Webinar Testing Quality of Microphones

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Introduction XL3 Acoustic Analyzer

This webinar offers a first introduction to our brand-new XL3 Acoustic Analyzer, i.e.

  • Operating the XL3
  • Connectivity / remote control
  • Which measurement functions are supported
  • Data logging & export

XL3 Introduction Webinar

Read more about the XL3 Sound Level Meter 

Sound Level Measurements with the XL3 Acoustic Analyzer

In this webinar, we provide a comprehensive look at the applications & features of the XL3 Acoustic Analyzer in Sound Level Meter mode.
 

Sound Level Measurements with the XL3 Acoustic AnalyzerRead more about the XL3 Sound Level Meter

XL3 API for Seamless Noise Monitoring

The webinar guides you through the utilization of the XL3 Acoustic Analyzer's API (Application Programming Interface). This robust tool enables full control of the XL3 in two principal ways,

  1. Traditional communication through queries and responses - an established approach that is fully supported by the XL3.
  2. The streaming API, which is a powerful tool particularly well-suited for the implementation of monitoring applications.

Our primary focus is on the second method. Thereby, we establish an example of a noise monitoring software, which covers various aspects such as configuration, streaming measurement values, audio recordings and SOH (state of health) information. The example is implemented by using Python. It is worth noting that while Python skills are beneficial, they are not mandatory to comprehend the webinar content.

 

XL3 API for seamless nose monitoring

Read more about the XL3 Sound Level Meter