audioXpress Magazine      June 2022

  audioXpress remains the authority on audio and reproduced sound by connecting manufacturers and distributors with developers, buyers and consultants around the globe! It's readers are the audio product designers, consultants, integrators, DIY enthusiasts, opinion leaders and your best customers. All of them agree that the coverage of trending topics, unique in the audio industry, make audioXpress a must read.

Every month, audioXpress combines the best educational articles on topic such audio electronics, speaker and headphone design, amplifiers (from tube to Class D), acoustics, practical test and measurement, audio engineering praxis, and standards. audioXpress provides inside stories on new audio developments, on R&D Stories, the most complete objective reviews of innovative products and software, and selects some of the best DIY audio projects from worldwide experts.

From The Editor's Desk
4 From The Editor's Desk
Driving Audio Innovations Sound systems inside the car are at the core of all user interactions with the vehicle.
Editorial By J. Martins

5 Client Index

Features
42 Røde NTH-100 Headphones
Making a Late, Refined Entrance
By Brent Butterworth
With the NTH-100, microphone specialist Røde
launches its first product into the crowded studio
headphone market. Brent Butterworth explores how
the NTH-100 stacks up to the competition — in the
studio and on the test bench.

50 How Signal Processing and Filter
Bank Design Impacts Sound
Quality in Hearing Aids
By Dana Helmink
This article discusses the nuances of signal processing
and filter bank design, exploring the most impactful
decisions in filter bank types specific to hearing aids,
and how ultimately each approach helps dealing with
the hearing challenges that people face.

54 ANC Headset Testing
By H. W. Gierlich
This article discusses requirements for effective
performance testing of communication headsets
that use active noise cancellation (ANC) technologies.
It addresses test setups, testing equipment and
setup conditions needed to correctly assess ANC
performance.

62 Building a Guitar-Controlled
Synthesizer
LFO and ADSR
By Ethan Winer
Ethan Winer's two previous articles described circuits
he developed for his current project that uses an
electric guitar instead of a keyboard to control
an analog synthesizer. This article continues with
two components that are essential for all analog
synthesizers: the Low Frequency Oscillator (LFO) and
the Attack Decay Sustain Release (ADSR) envelope
generator.

Columns
Sound Control
38 The Acoustical Effects of Room Shapes
By Richard Honeycutt
In this article, our acoustic expert focuses on the effect
of the interior shape on specific acoustical parameters,
including reverberation time, lateral fraction, and echo speech.

Market Update — Automotive Audio
8 Audio for All-Electric Vehicles
By J. Martins
Electric, Connected, Autonomous. That's how we describe
cars of the (near) future. And that also means that cars
will have to be smart, and be able to accommodate completely
new requirements for drivers and passengers. And the audio
industry is working on it. This article offers a broad perspective
of a sector in radical transformation.

Automotive Audio Solutions
22 Upmixing and the Future of In-Car Audio
By Emil Hemström and Rüdiger Fleischer
With increasingly silent electric vehicles, car manufacturers
are adding sophisticated audio systems that support
many different functions, including high-quality
immersive music capabilities. Those need to be consistent
for driver and passengers, regardless of the source format.
Learn how digital signal processors and upmixing
provide the solution.


26 Evaluation of Automotive Audio Energy Efficiency
By Philipp Paul Klose
An approach to measure energy consumption and efficiency
of car audio systems is essential in an industry investing
in ever-more sophisticated technologies and applications.
This article proposes practical approaches, including
standardized test procedures.

30 An Interview with John Whitecar
A Decades-Long Journey to the Future of Automotive Audio
By Adam Levenson
John Whitecar is the VP of Product Management, Automotive
at DSP Concepts. A leading expert in automotive technology,
respected around the world, he believes we are only seeing the
tip of the iceberg where audio signal processing technology
can be applied.

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