All items tagged with The Audio Voice (22)

Bandwidth, Slew Rate and All That Jazz

October 20, 2023 by Jan Didden

Bandwidth, Slew Rate and All That Jazz

To reproduce an audio signal faithfully over the whole audio band, your circuit needs to have a bandwidth at least as large as the audio band. But that’s not the only requirement: your circuit needs to maintain that bandwidth from the lowest to the highest signal level. That’s where the crux lies: it is relatively easy to get a nice wide bandwidth for small signals, only to have it breakdown with high signal levels due to the dreaded slew rate limiting.

Audio Myths: Feedback Cannot Fix What Has Already Happened

August 24, 2023 by Jan Didden

Audio Myths: Feedback Cannot Fix What Has Already Happened

This article, originally published in The Audio Voice newsletter (#434), explores some practical experiments with Negative Feedback. "If I had a dollar for every time someone mentioned that negative feedback cannot work, because you cannot correct something after it happened, I would be a rich man," says Jan Didden. "Yes, it can be hard to get your head around feedback circuits for audio amplifiers. Yet, all it takes is to look around you," he adds.

SonicEdge MEMS Ultrasound Speaker-In-Chip: Next Gen MEMS for TWS Earbuds and Hearing Aids

February 24, 2023 by Mike Klasco

SonicEdge MEMS Ultrasound Speaker-In-Chip: Next Gen MEMS for TWS Earbuds and Hearing Aids

Mike Klasco writes all about the cutting-edge SonicEdge MEMS Ultrasound Speaker-In-Chip. A next-gen MEMS solution for TWS earbuds, hearing aids, and hearables. Entering production in 2023, this unique ultrasonic shutter MEMS-based speaker system represents a decade's work in a unique topology. The core of the design is one or more apertures driven by the ultrasonic carrier signal and one or more movable and over-sized obstruction elements that are configured to modulate the ultrasonic carrier signal (think of a shutter) thereby generating audio.

Nuvoton ICs with Integrated Klippel Controlled Sound - New Possibilities for Speaker Design

September 22, 2022 by Mike Klasco

Nuvoton ICs with Integrated Klippel Controlled Sound - New Possibilities for Speaker Design

What more could speaker system designers want? How about not just to protect the speaker from overload, but enable the speaker to play louder with reduced bass distortion? Mike Klasco writes about his experience working with Nuvoton smart amps with integrated Klippel Controlled Sound (KCS) technology. Now in mass production and offering new possibilities for speaker design. First product examples are now available in the market.

Meeting Supply for Vacuum Tubes - Time to Save Those Tubes?

March 18, 2022 by Joao Martins

Meeting Supply for Vacuum Tubes - Time to Save Those Tubes?

The situation in Ukraine and the sanctions imposed on Russia are having a significant impact on the global supply of tubes to the audio industry. Both Ukraine and Russia are important suppliers of raw materials, and the sanctions are likely to cause further strain over the supply of source materials that all manufacturers of tubes need. In China there are also significant disruptions caused by pandemic lockdowns, transportation challenges, and cost increases. How many tube manufacturing operations remain viable? Western Electric says there is hope... in the US!

The MEMS Microphone Book- What's Different (And So Promising) With MEMS Microphones

February 18, 2022 by Joao Martins

The MEMS Microphone Book- What's Different (And So Promising) With MEMS Microphones

In this article I share my early impressions of The MEMS Microphone Book by Mikko Suvanto. 21 years in the making, this is a reference book with over 600 pages and I decided that I should write about it here ASAP, because I believe that the work deserves attention and I'm confident enough on the quality of the content to recommend it. The MEMS Microphone Book, "A practical guide to reliable high-quality sound capturing with miniature microphones" (ISBN 978-952-94-5660-4) is available and my article details what it contains and who should read it.

The Standards We Need. A Review of the Book "Introducing Bluetooth LE Audio" by Nick Hunn

January 20, 2022 by Joao Martins

The Standards We Need. A Review of the Book "Introducing Bluetooth LE Audio" by Nick Hunn

This article is a review of the recently distributed book, Introducing Bluetooth LE Audio, by Nick Hunn, Chair of the Bluetooth SIG Hearing Aid Working Group, Vice Chair of the Generic Audio Working Group and a key contributor to the Bluetooth LE Audio specifications. This is an important book for everyone who wants to understand Bluetooth LE Audio. But has the industry momentum for Bluetooth LE Audio been lost? Two years after the original Bluetooth LE Audio announcement in 2020, all we have is a Book.

CES 2022 Audio Highlights. 10 Companies We Want to See and Hear Again!

January 13, 2022 by Joao Martins

CES 2022 Audio Highlights. 10 Companies We Want to See and Hear Again!

It was just like CES 2022 was a blink. We walked all over CES 2022, from hotel suites and halls - literally and virtually - to report on these great audio companies and technologies! Among our #CES2022 audio highlights we discuss presentations and demos from xMEMS Labs, Noveto, Exeger, Mayht, Tectonic, Resonado, Fraunhofer IIS, Silentium, GaN Systems, and Axign. Text and CES report originally published in The Audio Voice weekly newsletter.

Natural Hearing and Augmentation. A New Approach to Open-Ear.

November 18, 2021 by Joao Martins

Natural Hearing and Augmentation. A New Approach to Open-Ear.

Could Auricle have cracked the code of headphone isolation and hearing augmentation in an open-ear form-factor? Auricle, a company founded in 2018 and based in Denmark, identified the common problem of situational awareness or lack thereof when using headphones. In response, Auricle perfected bone conduction technology in a wireless design that still leaves the ear canal completely open. A platform with great potential for hearing augmentation, and a novel personal audio design that combines awareness, communication, hearing, and fun.

Qualcomm Snapdragon Sound: Questions, Development, Audio Momentum and the Market

July 2, 2021 by Joao Martins

Qualcomm Snapdragon Sound: Questions, Development, Audio Momentum and the Market

In early March 2021, following a series of announcements in development platforms and solutions for wireless audio, Qualcomm announced Qualcomm Snapdragon Sound, a new end-to-end approach to promote high-resolution digital audio and enhanced voice communications across devices. The systems' approach combines and optimizes multiple Qualcomm technologies for mobile platforms, processing, connectivity, plus the latest aptX Adaptive audio technologies needed to improve the sound experience for consumers. But how can manufacturers and new brands benefit? Will there be a lossless extension for aptX Adaptive? We asked the questions to Jonny McClintock, Director of aptX Sales & Marketing at Qualcomm.

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