The Audio Measurement Issue! audioXpress March 2022 is Now Available

As a long-standing custom and one our hottest matters, our Take a look at and Measurement challenge addresses the newest instruments and options assembly real-world challenges in audio. audioXpress March 2022 consists of an intensive Market Replace report, reviewing the audio check and measurement market section and traits, together with latest mergers and acquisitions. The characteristic article highlights all the brand new audio check and measurement merchandise and options launched in the course of the previous 12 months. Uncover merchandise and options from HEAD acoustics, Audio Precision, GRAS Sound & Vibration, NTi Audio, Klippel, Pay attention, Echo Take a look at + Measurement, Define, QuantAsylum, ZUMI Programs, and even Bluetooth LE Audio seize and evaluation options from Ellisys.

Including an amazing perspective on the subject of check and measurement, particularly for manufacturing strains, our good good friend Matt Taylor, wrote an introduction to the usage of REST for Automated Take a look at and Measurement. His article makes the case for utilizing internet interfaces, and embrace internet requirements for automated testing of audio tools, essentially exploring the probabilities of REST – which stands for Representational State Switch, a broadly accepted set of tips for creating dependable internet APIs. Our readers will acknowledge Matt from his Seattle, WA-based firm QuantAsylum, however this contributed piece advocates an open-design philosophy for controlling and querying issues through REST, and leveraging the know-how of hundreds of thousands of builders. As Matt says, “As an alternative of needing an engineer that is aware of how one can write GPIB or LabVIEW – a reasonably specialised set of abilities – you should use an engineer who is aware of how one can code internet apps. And the way cool is that!”

Complementing the subject of Audio Take a look at and Measurement, Joe Start (Audio Precision) wrote an article that addresses the sensible method to check and consider multichannel MEMS microphone arrays. The simultaneous acquisition and measurement of alerts from a microphone array presents quite a lot of challenges to builders looking for to judge their designs. This text explains the basics to handle challenges in smartphones, sensible audio system, and all kinds of voice-activated gadgets, usually utilizing two, and as much as seven or extra microphones.

Featured on this month’s cowl can also be our prolonged evaluation of  KEF’s tiny however giant-sounding KC62 subwoofer. Oliver Masciarotte and Kent Peterson, the incredible duo who just lately reviewed the KEF LS50 Meta audio system for audioXpress, have now prolonged their evaluation with an in depth evaluation of the KC62 compact subwoofer, which mixes KEF’s force-canceling and Uni-Core applied sciences in a brand new method to permit maximizing bass in a minimal house. Masciarotte did the listening and spoke with Jack Sharkey, Senior Technical Engineer at GP Acoustics, about this fascinating design. For this evaluation, the KEF KC62 subwoofer was measured by Peterson at Warkwyn’s facility utilizing the Klippel measurement system.

For these trying right into a sensible DIY challenge, Ben Chen (Sfera Labs) proposes a Sound Degree Analysis answer based mostly on the favored Raspberry Pi 4. His article particulars the probabilities of utilizing the Sfera Labs’ Exo Sense Pi – a compact multi-sensor module with a Raspberry Pi 4 – as a sound meter. The creator illustrates the primary ideas concerned, and doable software program functions for sound stage analysis. The Exo Sense Pi combines a number of environmental sensors and connectivity choices, and integrates a digital microphone which can be utilized to judge ambient noise ranges or measuring noise sources.

And for his Sound Management article, Richard Honeycutt writes exactly in regards to the matter of Sound Ranges – How Loud Is It? As he particulars, through the years, how our notion of loudness has modified and whereas sound could be measured in many various methods, we have to be delicate to what’s the correct sound stage for all involved, not simply what is feasible. In his article, he discusses a number of the loudest sound sources and what elements affect an viewers’s notion of the correct loudness.

Bonus Digital Content material!

Extending the March 2022 challenge and increasing on matters coated in earlier editions, the net version of audioXpress incorporates a full Market Replace on Voice Seize and Voice Interface Programs – an space of nice exercise on previous months. On this article, audioXpress appears in any respect the newest voice front-end options, from miniature ECMs to MEMS microphones to finish voice front-ends for voice recognition and voice interface functions. An incredible overview of the newest key know-how parts which might be obtainable for the event of voice options in a number of software fields.

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