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audioXpress Magazine

audioXpress Magazine      February 2021

 

audioXpress Magazine February 2021

 

  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.

 

 

Comment
4 This Issue's Editorial: An Audio Renaissance
Truly interesting trends are addressed in this edition of audioXpress
Editorial By J. Martins, Editor-in-Chief

 

8 From Home to the World
Microphones Get Essential Status
By J. Martins
The topic for this Market Update couldn't
be more relevant to the audio industry.
Because if there was a product category
that was completely disrupted in 2020, it
was certainly microphones. Surprisingly,
a lot of positive things happened for their
manufacturers.

 

22 Enabling Voice Capture and Developing for Voice Interfaces
By J. Martins
Because microphones are a critical
front end for innovative applications in
voice recognition and transcription—
technologies that continue to show the
same expansion trends in 2021—in this
Market Update we explore what's new
in voice capture and voice interface
development.

 

34 Why Thousands of Virtual Microphones Matter
The Impact of Acoustic Spatial Resolution in a 3D Space
By Erica Yorga (Nureva)
Thousands of virtual microphones. It's what
Microphone Mist technology offers, and it sounds
impressive. In this article, Erica Yorga explains what
it really means and the impact thousands of virtual
microphones actually have on your daily conference calls.

 

44 Widex Moment mRIC RD Hearing Aid
By Brent Butterworth
Can a hearing aid use DSP to deliver superior
performance plus the convenience and versatility of
the latest true wireless Bluetooth earphones? Brent
Butterworth tests the Widex Moment to find out.

 

audioXpress Magazine February 2021

 

52 The Science and Physics of High-End Mic-Preamp Design (Part 1)
Principal Mechanisms for Audio Designers: Engineering the Sound of Silence
By Mike Meechan
This series of articles investigates the principal
mechanisms of noise, distortion, and interference
that microphone preamplifier audio designers must
understand, before exploring various circuit topologies
used to maximize performance and minimize
susceptibility. Finally, the ideal solution is considered.

 

60 X-Altra Moving Coil/Moving Magnet RIAA EQ Preamplifier (Part 1)
Design Overview and MC Preamplifier
By Andrew C. Russell
For this DIY project, Andrew Russell shares the X-Altra
Phono EQ Preamp, which is an accurate, very low
noise, high-performance phono equalizer that will
accept moving coil and moving magnet inputs.

 

40 Design Considerations Imbedding a High-Output
Buffer Inside an Op-Amp Loop
By Michael Steffes

 

 

 

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