audioXpress - June 2018

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It’s About the Sound
8 Exploring Master Quality Authenticated (Part 2)
Measuring Streamed MQA
By Ron Tipton
14 Back EMF Phase Relationships in Moving-Coil Loudspeakers (Part 2)
Thought Experiments
By Andy Lewis
In this article series, Andy Lewis explores the generation of Back EMF in the region of a loudspeaker’s resonance. Here, he performs simple “thought experiments” to make qualitative observations about the activity of a moving-coil driver in the region of its resonance.
sound control

18 Stereo Listening
Acoustics, Electroacoustics, and Psychoacoustics
By Richard Honeycutt

24 MPEG-H Audio Brings New Dimensions to TV Sound
By Stefan Meltzer
Fraunhofer Institute for Integrated Circuits IIS designed a way to improve immersive sound reproduction capabilities on consumer playback devices, based on MPEG-H decoding and rendering and Fraunhofer’s upHear soundbar processing. This article is a technology update on MPEG-H and Fraunhofer upHear implementations.

28 Mixing and Mastering for Today’s Music Streaming Services
By Jon Schorah
In 2015, the world changed as music streaming went from being the biggest delivery vehicle to the highest revenue generator in the music industry. However, there is still little understanding and only a few tools to mix and master streamed audio.

32 Engineering Voice-Enabled Smart Gadgets
By Ofer Elyakim
This article offers an overview of DSP Group’s experience in enabling voice in a variety of new consumer electronics devices, using its open audio/voice DSP platform.

38 From Cochlear Implants to a Personal Audio Breakthrough
An Interview with Robert Oliveira of Comply Foam
By Shannon Becker

42 The TSM-100
A Turntable Speed Measurement Device
By George Ntanavaras

54 Transformers for Tube Amplifiers (Part 2)
Rating and Building the Circuitry
By Gerhard Haas

Hollow-State Electronics
60 The Evolution of Tone Controls in Tube Amplifiers
By Richard Honeycutt