All items in category Theory Articles
Communications: Testing and Optimizing Strategies for Conference Terminal Equipment
by Hans W. Gierlich

Communications: Testing and Optimizing Strategies for Conference Terminal Equipment

Following up on the two Communication articles published in audioXpress October 2020, Hans W. Gierlich, from HEAD acoustics GmbH, a top expert in his field, contributed this great overview article. With most company employees working from home and the trend toward decentralized organizations and remote collaborations, where webinar and conferencing services are the new way of communication, this a timely topic. This article was originally published in audioXpress, November 2020.
Read more...
Thin-Film High-Frequency Transducers (Part 2) - The LT2/LT6 Ribbon Transducers
by Igor Levitsky

Thin-Film High-Frequency Transducers (Part 2) - The LT2/LT6 Ribbon Transducers

In its August 2020 edition, Voice Coil featured an article by experienced speaker designer Igor Levitsky on The Advantages of Thin-Film High-Frequency Transducers. In a follow-up Spotlight article the author returns to expand on the development and design aspects of the Radian Audio LT2/LT6 Ribbon Planar transducers - its more recent, commercially available project, in which he continues to be involved. This article was originally published in Voice Coil, September 2020.
Read more...
Thin-Film High-Frequency Transducers (Part 1) - The Advantages
by Igor Levitsky

Thin-Film High-Frequency Transducers (Part 1) - The Advantages

In its August 2020 edition, Voice Coil featured an article by experienced speaker designer Igor Levitsky, highly recognized in the industry for developing some of the best planar magnetic speaker and headphone drivers for some of the most reputed brands, focusing precisely on this type of technology. It seems clear that we will see more and more headphones and speakers using thin-film drivers, as the industry is now perfecting the use of different types of diaphragms and materials. The August 2020 edition of Voice Coil includes the first part of this article, completed in the September 2020 edition.
Read more...
Voice Coils: A Tutorial
by Mike Klasco

Voice Coils: A Tutorial

Mike Klasco (Menlo Scientific) provides an overview on how to specify or manufacture voice coils. In this reference article, Mike Klasco recaps on voice coil basics, bobbin materials and sizes, collars, winding techniques, configurations, tips and tricks and wire types and considerations - a valuable, concise compendium of unique knowledge. This article was originally published in Voice Coil, August 2020.
Read more...
Practical Test & Measurement: Fast and Reliable End-of-Line Acoustic Defect Detection
by Wolfgang Klippel

Practical Test & Measurement: Fast and Reliable End-of-Line Acoustic Defect Detection

This article discusses end-of-line testing, a crucial step in production, which requires very specific procedures and measurements. Specifically, the authors focus on testing irregular acoustic defects (also known as Rub & Buzz) to reduce the test time and optimal solutions to speed automatic testing in a production environment. This article was originally published in audioXpress, September 2020.
Read more...
 FREE DOWNLOAD
The Internal Life of Vacuum Tubes
by Jan Didden

The Internal Life of Vacuum Tubes

A few years ago, Jan Didden designed a high-voltage delay unit and shared its details in a 2019 audioXpress article. Many people built it and like it, but others said that it would be totally unnecessary. As so often happens in audio, arguments pro and con raged without a clear resolution. So Didden thought this was something he needed to get his head around. He found several sources, which he thought were credible, and this article is the result of his investigations, fed by those sources. This article was originally published in audioXpress, August 2020.
Read more...
Soundmatters and BDNC's Super-Shallow High-Excursion Speakers
by Mike Klasco

Soundmatters and BDNC's Super-Shallow High-Excursion Speakers

Mike Klasco (Menlo Scientific) writes about "a very cool" concept from Soundmatters, the company's UPstage speaker design, a new speaker product category and the next trend from the people that invented the soundbar. The sophisticated engineering implemented by soundmatters into the UpStage compact high-performance audio system was also the launch platform for BDNC's high-power, flat glass woofer that uses a 0.2 mm glass diaphragm. This article also explains what manufacturers need to know about the BDNC glass diaphragm, high-excursion, ultra-low profile woofer technology.
Read more...
Servo-Control in Mainstream Audio: From Motional Feedback to the Bend-Sensor
by Mike Klasco

Servo-Control in Mainstream Audio: From Motional Feedback to the Bend-Sensor

Imagine a new class of speaker diaphragm position sensors that enable audio engineers to reduce distortion and extend bass response from studio monitors, soundbars, smart speakers, and even smartphone microspeakers. With the precision of laser displacement instrumentation, this sensor is located between a stationary component of the speaker and an appropriate moving part to provide an error correction reference signal back to the amplifier. Well, that sensor has already been developed. ​This article was originally published in The Audio Voice weekly email newsletter.
Read more...
Practical Test & Measurement: Objective Listening Effort Evaluation
by Hans W. Gierlich

Practical Test & Measurement: Objective Listening Effort Evaluation

This article by Hans W. Gierlich and Jan Reimes - two top experts in communication technologies from HEAD acoustics GmbH - details the expanded effort for understanding speech under noisy conditions, and addresses a new approach recently introduced by HEAD acoustics, resulting in a new model that can be used to test active noise cancellation (ANC) performance in complex scenarios where the system needs to distinguish between speech signals as part of the background noise and speech signals directed toward the users of these devices. This article was originally published in audioXpress, April 2020.
Read more...
Voice Capture Challenges: The Threshold of the Golden Age of Voice
by Mike Klasco

Voice Capture Challenges: The Threshold of the Golden Age of Voice

Voice processing and recognition leading to the development of voice-based personal assistants is one of the decade’s greatest achievements and provides a unique opportunity for the audio industry. Leveraging those sophisticated technologies now available to the consumer electronics industry makes the investment on new designs much more exciting. In this article, Mike Klasco provides an introduction to the voice capture, signal processing and voice recognition challenges. This article was originally published in audioXpress, December 2018.
Read more...