In this issue

FROM THE EDITOR’S DESK—Invitation-Only Audio History, by J. Martins, p. 4
Echo AIO: A Cost-Effective Audio Test System, by Stuart Yaniger, p. 8
MARKET UPDATE—Modular Evolution in Audio Testing, by J. Martins, p. 18
Acoustical Measurement and DSP Amplification in Automotive Audio, by Philipp Paul Klose, by 28
Transitioning Audio Tests from R&D to the Production Line, by Steve Temme, p. 34
Burkhard Vogel’s Slopes and Levels: SPCE Models to Simulate Vintage Op-Amp Noise, Review by Marcel van de Gevel, p. 40
Lumped Element Modeling of Transducers, by René Christensen, p. 44
Modern PC Board Design Practices (Part 2): Tips and Techniques, by Ethan Winer, p. 50
Power Transformer Parameters, Selection, and Testing (Part 5): Losses, by Chuck Hansen, p. 56
HOLLOW-STATE ELECTRONICS—Accuracy in LTspice Modeling, by Richard Honeycutt, p. 62

Echo AIO

A Cost-Effective Audio Test System

10+ mins

Modular Evolution in Audio Testing

The audio industry continues to benefit from significant progress in advanced software as well as modular hardware solutions. This overview of the latest audio and industry-related test and measurement solutions identifies market trends for this critical segment.

10+ mins

Acoustical Measurement and DSP Application in Automotive Audio

This article offers a primer on how to approach acoustic measurements and the practical application of DSP in car cabins, one of the hardest acoustic environments for quality sound reproduction. The topics addressed in this article will be expanded in future articles.

8 mins

Transitioning Audio Tests from R&D to the Production Line

Production line audio testing poses many challenges such as noisy environments, harsh operating conditions, high throughput, relative limits, and more. In this article, Steve Temme shares his observations and outlines the main considerations to ensure a successful operation.

10+ mins

Burkhard Vogel's Slopes and Levels

Spice Models to Simulate Vintage Op-Amp Noise

7 mins

Lumped Element Modeling of Transducers

Many engineering tasks require a common ground from which discussions among those involved in a project can take place in a structured manner. This will often involve a so-called model of the concept or product, and this article discusses one such model: the lumped element model.

8 mins

Modern PC Board Design Practices

Tips and Techniques

10+ mins

Power Transformer Parameters, Selection, and Testing

The initial group of articles focused on the history of transformer cores, construction methods and materials, and various testing methods. After having discussed the parameters of transformers, this article expands on their losses.

10+ mins

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