All items in category Magazine Articles
R&D Stories: The Impact of Acoustic Spatial Resolution in a 3D Space
by Erica Yorga

R&D Stories: The Impact of Acoustic Spatial Resolution in a 3D Space

Nureva's Microphone Mist technology is a patented concept of generating thousands of virtual microphones in a 3D space. This article explains why this can be the alternative approach to the status quo of physical microphones and beamformer systems to create perfect audio conferencing solutions in any type of room and with multiple users. This article was originally published in audioXpress, February 2021.
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Patent Review: Two Single-Ended Planar-Magnetic Speaker Patents
by James Croft

Patent Review: Two Single-Ended Planar-Magnetic Speaker Patents

James Croft reviews two loudspeaker-related patents as a tribute to David John Graebener, who passed away on January 3, 2015. First James Croft reviews the planar-magnetic electro-acoustic transducer he patented together with Graebener, followed by a single-end planar magnetic speaker system, David’s key patent. These were the first and second of the Single-Ended, Neodymium planar magnetic transducer patents David Graebener was granted. This article was originally published in Voice Coil, March 2015.
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Patent Review: Loudspeaker With a Wave Guide
by James Croft

Patent Review: Loudspeaker With a Wave Guide

This patent review looks at a “Loudspeaker with a Wave Guide” (Patent Number: US20140369543) by inventors Jussi Vaisanen and Ilpo Martikainen from Finish company Genelec. This patent relates to the Genelec 8351 Acoustically Coaxial Smart Active Monitor (SAM) monitor, originally launched in 2016. Later in 2017, Genelec expanded the concept into a complete series of Coaxial Active Monitors, “The Ones”. This article was originally published in Voice Coil, February 2015.
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Electrostatic Pure Silicon Microspeakers for Wireless Earbuds
by Hermann Schenk

Electrostatic Pure Silicon Microspeakers for Wireless Earbuds

This contributed article by Hermann Schenk, and Lutz Ehrig describes a new transducer technology that promises to be a power efficient solution for wireless earbuds. Arioso Systems is a successful Fraunhofer IPMS spin-off company that is now launching an innovative sound transducer principle for miniaturized headphones, in-ears and hearables. The article describes how this new technology, and specifically the company's new MEMS topology can contribute to the next-generation of true wireless earbuds.
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Patent Review: Compact Stand-Alone Stereo Loudspeaker
by James Croft

Patent Review: Compact Stand-Alone Stereo Loudspeaker

James Croft looks at an interesting new patent covering a “Compact Stand-Alone Stereo Loudspeaker” by inventor Jes Mosgaard from Libratone A/S (Denmark). This patent submitted in 2010, was granted in 2013, and describes a compact and portable stereo loudspeaker system that is capable of providing a spacious sound field using an internal stereo pair of loudspeakers arranged in a dipole configuration. This article was originally published in Voice Coil, February 2015.
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Fresh From the Bench: QuantAsylum QA401 and QA451 Compact and Modular Audio Measurement System
by David Logvin

Fresh From the Bench: QuantAsylum QA401 and QA451 Compact and Modular Audio Measurement System

On the cover of audioXpress December 2020, many of our readers instantly recognized the familiar look of the increasingly popular QuantAsylum QA401 audio analyzer. What many readers didn't recognize by then was the second module, the completely new QA451 programmable load, so new that audioXpress tested a pre-production version. In this review article, David Logvin shares his valuable perspective on this modular solution for audio measurements from QuantAsylum.
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Fresh From the Bench: The Puffin Phono DSP by Parks Audio
by Mike Harkins

Fresh From the Bench: The Puffin Phono DSP by Parks Audio

In this article, Mike Harkins reviews the versatile Puffin Phono DSP by Parks Audio. For those of you who are not familiar with Parks Audio, this company was founded by Shannon Parks, who has also contributed fantastic articles published by audioXpress. After experimenting with several other products, Parks Audio has achieved notoriety for its phono stage Puffin, which adds a programmable DSP and is able to be updated and improved constantly with simple firmware updates. A new approach that truly takes the concept of a phono stage to a different level. This article was originally published in audioXpress, December 2020.
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Audio Manufacturing in Vietnam: An Introduction to a Brave New World
by Mike Klasco

Audio Manufacturing in Vietnam: An Introduction to a Brave New World

This article for Voice Coil magazine offers a valuable perspective about one of the most promising manufacturing opportunities in Asia. While there has been speaker parts manufacturing and speaker assembly for more than 20 years in Vietnam, the recent influx of speaker and audio OEM/ODMs that are expanding satellite factories through the country was motivated particularly by companies looking to counter the trading tariffs imposed in the United States. This article was originally published in Voice Coil, September 2020.
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Patent Review: Single Enclosure Surround Sound Loudspeaker
by James Croft

Patent Review: Single Enclosure Surround Sound Loudspeaker

James Croft reviews a patent claimed by Polk Audio and granted in 2015, describing “a single-enclosure loudspeaker system that projects multichannel surround sound into a listener’s room, and so replaces multiple conventional surround channel loudspeakers.” The patent also describes, in one embodiment of the invention, that the “surround channel program material is pre-processed by an integrated wireless transmission device that performs certain digital signal processing and channel mixing steps in advance of wireless surround signal broadcast to a receiver.” This article was originally published in Voice Coil, January 2015.
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Patent Review: Loudspeaker for Eliminating a Frequency Response Dip
by James Croft

Patent Review: Loudspeaker for Eliminating a Frequency Response Dip

Every month on his Voice Coil's Acoustic Patents column, James Croft (Croft Acoustical) discusses different loudspeaker patents and inventions that are relevant to the audio industry. In the January 2015 edition. Croft reviewed a “Loudspeaker for Eliminating a Frequency Response Dip” patent, granted in November 12, 2014 to Harman International Industries, describing “a speaker system that includes a speaker enclosure having a front end, a rear end, and a first transducer. This article was originally published in Voice Coil, January 2015.
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