audioXpress - April 2020

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8 Actively Enhancing Our Hearing By J. Martins and Mike Klasco In this Market Update focused on headphones, we take a closer look at how the industry is transitioning from headphones and earphones to active designs, fostering the booming true wireless and hearables categories.
22 Tackling Voice Capture and Processing Technologies By J. Martins In this Market Update, we examine what voice can do for audio development, focusing on voice recognition and what voice capture and processing technologies can do for audio manufacturers and the audio industry in general.
32 Objective Listening Effort Evaluation By Hans W. Gierlich and Jan Reimes This article discusses “listening effort analysis,” 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.
48 Sound Cards for Data Acquisition in Audio - The Linear Audio Autoranger Mk II Interface By Stuart Yaniger New possibilities in audio measurement systems, expanding on the basics of using sound cards combined with new accessible-to-all software tools, and a recently improved measurement interface option.
56 Powering Your Circuits (Part 3) - AC Power Rectification and Smoothing By Ed Simon After discussing battery power and AC power supplies, this article expands the discussion to transformers and power rectification.
44 Loop Gain and Phase Margin Considerations in Applying Fully Differential Amplifiers to Active Filters By Michael Steffes
60 Triode Power Amplifiers By Richard Honeycutt