All items tagged with René Christensen (14)

audioXpress June 2024 Models Automotive Audio Development

May 13, 2024 by audioXpress Staff

audioXpress June 2024 Models Automotive Audio Development

audioXpress June 2024 puts automotive audio development into perspective. Starting with how AI and SDV are impacting the industry, an analysis of Integrated Audio Development Frameworks, how sound defines the driving experience of Electric Vehicles, and lessons learned from aftermarket car audio. Learn how to measure MEMS microspeakers, enjoy two great multiphysics simulation articles by Jinlan Huang and René Christensen, and much more.

Simulation Techniques: Acoustical Shape Optimization for Vibroacoustics Applications

April 24, 2024 by René Christensen

Simulation Techniques: Acoustical Shape Optimization for Vibroacoustics Applications

Having detailed how formal optimization can be used for product design of audio products such as speakerphones and waveguides, in this article René Christensen explores free-form and alternative optimization techniques where the topology of the geometry is given from the outset. Using practical examples, this article addresses shape optimization techniques, identifying useful types of boundaries and challenges to look out for audio product designs. This article was originally published in audioXpress, February 2024.

Simulation Techniques: Room Gain

April 17, 2024 by René Christensen

Simulation Techniques: Room Gain

Room Gain is a term not used in acoustics textbooks as such. Room acoustics is naturally often discussed in the hifi community, since the room you put your loudspeakers in will heavily influence the sound that reaches your ears, both at low and high frequencies. In these discussions the term "room gain" sometimes comes up. This article was inspired by Erik Wiederholtz (CTO of Perlisten Audio) and his interest in the topic, and he was kind enough to provide measurements and photos from his own listening room for a sealed subwoofer as well as for a vented subwoofer.

Simulation Techniques: Acoustic Topology Optimization for Vibroacoustics Applications

April 10, 2024 by René Christensen

Simulation Techniques: Acoustic Topology Optimization for Vibroacoustics Applications

Acoustic topology optimization is one of the most interesting new technologies in vibroacoustics. These powerful tools enable engineers to find optimal solutions to problems related to their specific applications and this article presents multiple examples in different areas. The article, originally published in audioXpress, April 2023, includes several examples of transducer geometries modified via acoustic topology optimization.

Simulation Techniques: Lumped Element Modeling of Transducers

March 27, 2024 by René Christensen

Simulation Techniques: Lumped Element Modeling of Transducers

An exploration of the possibilities for product development focusing on modeling of transducers. As many engineering tasks require a common ground from which discussions among those involved in a project can take place in a structured manner, this often involves a so-called model of the concept or product. This article discusses one such model: the lumped element model. This article was originally published in audioXpress, March 2023.

Capture Adaptive Audio Intelligence in audioXpress February 2024

January 9, 2024 by audioXpress Staff

Capture Adaptive Audio Intelligence in audioXpress February 2024

In the February 2024 issue of audioXpress read the latest on AI, Adaptive Audio Enhancement, and Noise Cancellation, Microphones, and Voice Capture. René Christensen writes about Acoustical Shape Optimization, and Richard Honeycutt writes about Sustainable Acoustical Products. David Ralph writes about Duelund vs. Linkwitz-Riley crossovers, and Paul Kittinger explains how to build the Duetta Transmission-Line speakers. Chris Paul writes about A Better Beta Follower amplifier, while Richard Honeycutt puts together an Imaginary Silvertec Guitar Amplifier.

Simulation Techniques: Loudspeaker Driver Displacement Decomposition

October 25, 2023 by René Christensen

Simulation Techniques: Loudspeaker Driver Displacement Decomposition

This article by René Christensen (BSEE, MSc, PhD), offers a valuable tutorial that discusses the unique possibilities of three-dimensional analysis of loudspeaker driver displacement, using Phase Decomposition and Axial-Symmetrical Decomposition techniques. The article demonstrates how a total displacement on a cone surface can be decomposed into different components directly in COMSOL Multiphysics, and how this can reveal some of the underlying mechanisms of the driver.

Simulation Techniques: Misconceptions in the Audio Industry

September 20, 2023 by René Christensen

Simulation Techniques: Misconceptions in the Audio Industry

In this fascinating article about common sound theory misconceptions that exist in the audio and hifi communities, René Christensen debunks three of them. Starting with group delay and phase delay, what actually happens when a loudspeaker driver moves outward and inward, and the effects of polarity and phase flip. True reference material with detailed mathematical expressions and numerical analysis. This article was originally published in audioXpress, June 2023.

Active Acoustics, Noise Cancellation, and Product Development in audioXpress August 2023

July 14, 2023 by audioXpress Staff

Active Acoustics, Noise Cancellation, and Product Development in audioXpress August 2023

As audioXpress August 2023 focus on Acoustics, read the report on Electroacoustic Enhancement and Active Acoustics. René Christensen details the model and application of the SonicEdge Ultrasound Speaker. Philipp Paul Klose writes about Noise Cancellation in Automotive Audio. And we visit the Western Electric Tube Factory in Rossville, GA. Read the AXPONA 2023 show report, how to Design a True Midrange Driver, and how to build an Instrumentation Amplifier-Based Preamplifier Line Stage.

Audio Amplifiers and Exciting Innovations in audioXpress July 2023

June 12, 2023 by audioXpress Staff

Audio Amplifiers and Exciting Innovations in audioXpress July 2023

audioXpress July 2023 provides an updated market and technology overview of Audio Amplifiers, includes the review of the Hypex Nilai500DIY 500W Power Amplifier Kits, a visit to Dutch company Grimm Audio, and an interview with Rémi Guastavino to discuss the new GRAS EQset measurement microphone series. Plus a review of the new WiiM Pro Music Streaming System, a new article series about Bass Reflex speaker performance, and a lot more.

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