All items tagged with feedback (14)

You Can DIY!: A High-Performance 60-Watt Class A Amplifier - Part 2 Power Supply and Measurements

August 13, 2024 by Andrew C. Russell

You Can DIY!: A High-Performance 60-Watt Class A Amplifier - Part 2 Power Supply and Measurements

The continuation of this 60-Watt Class A amplifier project, named the ax-Amplifier, this design uses Augmented Feedback Error Correction (AFEC) to achieve ultra-low distortion and improve key audio performance parameters without adding too much complexity and cost. The first part of this article described the amplifier design in detail. This second part details the power supply system and conclusion with measurements. This article was originally published in audioXpress, May 2024.

You Can DIY!: A High-Performance 60-Watt Class A Amplifier - Part 1 Amplifier Design

August 7, 2024 by Andrew C. Russell

You Can DIY!: A High-Performance 60-Watt Class A Amplifier - Part 1 Amplifier Design

From the experienced hands of Andrew C. Russell, of Hifisonix fame, comes the ax-Amplifier, a Class A design that uses Augmented Feedback Error Correction (AFEC) to achieve ultra-low distortion and improve key audio performance parameters without adding too much complexity and cost. Published in two parts, the first article addresses the amplifier design in detail, with Part 2 detailing the power supply system and conclusion with measurements. This article was originally published in audioXpress, April 2024.

Audio Myths: Why Narrow Bandwidth May Be Better also in the Time Domain.

June 22, 2023 by Jan Didden

Audio Myths: Why Narrow Bandwidth May Be Better also in the Time Domain.

This article expands the conversation around feedback theory for electronic circuits and audio amplifiers. Do we "really" need wideband open loop in audio amplifiers? The subject came up at the 154th Audio Engineering Society (AES) convention in Helsinki, Finland. Looking at the frequency domain, not necessarily, Jan Didden argued. In this article he looks at the question in the Time Domain. Narrow Bandwidth, High Open Loop Gain Amplifier versus a Wide Bandwidth, Low Open Loop Gain Amplifier in the Time Domain.

Audio Myths: Why Narrow Bandwidth May Be Better

June 15, 2023 by Jan Didden

Audio Myths: Why Narrow Bandwidth May Be Better

Although feedback theory for electronic circuits has been established for over a century, it is still a subject for discussion. This short essay is an attempt to shed some light on one of those recurring controversies. The subject came up at the 154th Audio Engineering Society (AES) convention in Helsinki, Finland. Audio amplifiers are basically integrators or, if you will, low-pass filters. That means that at some frequency, their open-loop gain starts to fall off. With that, the loop gain available for feedback also starts to fall off, leading to a diminishing of the curative effects of feedback: distortion starts to rise, gain accuracy starts to drop, output impedance starts to go up, etcetera.

Diodes Introduces High-Efficiency Class-D Stereo Audio Amplifier Device

October 13, 2021 by audioXpress Staff

Diodes Introduces High-Efficiency Class-D Stereo Audio Amplifier Device

Diodes Incorporated introduced the PAM8965 Class-D stereo audio power amplifier with an integrated synchronous boost converter, and external audio feedback pins, which allow for customization of sound. This high-efficiency device is targeted for use in AI-enabled, portable, wireless speaker systems, and portable musical instruments - where elevated output power, extended battery life, and compact construction are all key requirements.

Technics Releases New Premium True Wireless Earbuds Designed for Work and Play

September 28, 2021 by audioXpress Staff

Technics Releases New Premium True Wireless Earbuds Designed for Work and Play

Technics announced the new EAH-AZ60 and EAH-AZ40 true wireless earbuds, both equipped with JustMyVoice technology which provides improved clear voice communication during calls. The EAH-AZ60 model features a larger 8mm dynamic driver and LDAC support, using a total of eight mics on the left and right to power Dual Hybrid Noise Cancelling Technology, combining feedforward (FF) and feedback (FB) methods, as well as digital and analog processing for best-in-class ANC.

Servo-Control in Mainstream Audio: From Motional Feedback to the Bend-Sensor

July 16, 2020 by Mike Klasco

Servo-Control in Mainstream Audio: From Motional Feedback to the Bend-Sensor

Imagine a new class of speaker diaphragm position sensors that enable audio engineers to reduce distortion and extend bass response from studio monitors, soundbars, smart speakers, and even smartphone microspeakers. With the precision of laser displacement instrumentation, this sensor is located between a stationary component of the speaker and an appropriate moving part to provide an error correction reference signal back to the amplifier. Well, that sensor has already been developed. This article was originally published in The Audio Voice weekly email newsletter.

Panasonic Shows Strong True Wireless Ambitions at CES 2020

January 13, 2020 by audioXpress Staff

Panasonic Shows Strong True Wireless Ambitions at CES 2020

CES 2020 will be remembered as the strongest show for true wireless stereo product announcements so far, and also a pivotal moment for technology evolution in the segment. Among the first companies to make a strong statement at CES 2020 was Panasonic - and its affiliated brand Technics - with three different products, two of which already feature one of the most advanced Hybrid Noise-Cancelling Technology platforms currently available.

SoundChip Introduces Soundstation Array for Hybrid Noise Cancelling Headphone Development

October 15, 2018 by audioXpress Staff

SoundChip Introduces Soundstation Array for Hybrid Noise Cancelling Headphone Development

SoundChip introduced Soundstation Array, a spatially-limited diffuse sound field measurement platform designed to help brands characterize and tune hybrid noise cancelling headphones. Soundstation Array leverages SoundChip-sponsored post-graduate research into the minimum requirements for generating a sound field that is sufficiently diffuse for ensuring repeatable and reproducible measurements of noise cancelling headphones, without the need for an anechoic or reverberation chamber.

Waves Audio Introduces X-FDBK Feedback Eliminator Plugin

June 15, 2016 by audioXpress Staff

Waves Audio Introduces X-FDBK Feedback Eliminator Plugin

Showing the full power of audio processing software, digital signal processing solutions specialists Waves Audio introduced at InfoComm 2016 in Las Vegas, a new tool that provides the ultimate combination of practicality and user friendliness. The new Waves X-FDBK feedback eliminator plugin is an effective solution for one of the most common live sound problems.

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