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audioXpress Magazine

audioXpress Magazine      March 2022


audioXpress Magazine March 2022


  audioXpress remains the authority on audio and reproduced sound by connecting manufacturers and distributors with developers, buyers and consultants around the globe! It's readers are the audio product designers, consultants, integrators, DIY enthusiasts, opinion leaders and your best customers. All of them agree that the coverage of trending topics, unique in the audio industry, make audioXpress a must read.

Every month, audioXpress combines the best educational articles on topic such audio electronics, speaker and headphone design, amplifiers (from tube to Class D), acoustics, practical test and measurement, audio engineering praxis, and standards. audioXpress provides inside stories on new audio developments, on R&D Stories, the most complete objective reviews of innovative products and software, and selects some of the best DIY audio projects from worldwide experts.



From The Editor's Desk
4 From the Editor's Desk
The Internet Of People
'Things will soon be back to normal' is no longer sustainable.
Editorial By J. Martins


5 Client Index


8 Enter the (Tiny) Dragon
KEF KC62 Subwoofer with Uni-Core Driver Technology
By Oliver A. Masciarotte and Kent Peterson
Following the review of the KEF LS50 Meta speakers for
audioXpress, this article details the latest KC62 compact
subwoofer, combining KEF's force-canceling and Uni-Core
technologies. Oliver Masciarotte reviews this subwoofer and
speaks with Jack Sharkey, Senior Technical Engineer at
GP Acoustics. Then, Kent Peterson measures the subwoofer
using the Klippel Near Field Scanning system (NFS).


60 Sound Level Evaluation for Raspberry Pi 4
By Ben Chen
The article details the possibilities of Sfera Labs' Exo Sense Pi
a compact multi-sensor module with a Raspberry Pi 4 that also
offers a built-in microphone as a sound meter. The author
illustrates the main concepts involved and possible software
applications for sound level evaluation with the Raspberry Pi.


Sound Control
56 How Loud Is It?
By Richard Honeycutt
Over the years, our perception of loudness has changed and while
sound can be measured in many different ways, we must be
sensitive to what is the proper sound level for all concerned, not just
what is possible.


audioXpress Magazine March 2022


Market Update Test & Measurement
18 Evolution in Testing
By J. Martins
This market update focuses on the latest product launches and
solution updates announced over the past 12 months for audio test
and measurement plus an overview of the main market trends for
this critical segment, which continues to evolve and grow.


Edition Focus Test & Measurement
42 REST for Automated Test and Measurement
By Matt Taylor
This article makes the case for using web interfaces and embracing
web standards for automated testing of audio equipment,
fundamentally exploring the possibilities of REST which stands
for Representational State Transfer a widely accepted set of
guidelines for creating reliable web APIs.


48 Measuring MEMS Microphone Arrays
By Joe Begin
The simultaneous acquisition and measurement of signals from a
microphone array presents a variety of challenges to developers
seeking to evaluate their designs. This article details what to measure
and how to test and evaluate multichannel microphone arrays.


Market Update* Voice Capture & Voice Interface Systems
69 A Critical Front-End for Innovative Applications
By J. Martins
This article is an update on dedicated voice capturing and voice
front-end solutions. From sub-miniature and MEMS microphones
to complete voice front-ends for voice recognition and voice
interface applications, this is an intense area of activity for developers.

* Bonus content that appears in the Digital Edition, log into your account to view.




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