All items tagged with open loop (11)

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.

Audio Precision Releases APx v7.0 Audio Measurement Software and Introduces New Subscription Model

November 30, 2021 by audioXpress Staff

Audio Precision Releases APx v7.0 Audio Measurement Software and Introduces New Subscription Model

Audio Precision released the latest update to its APx500 audio measurement software, version 7.0, adding new enhancements suited to a wide range of audio test applications, whether analog, digital, or acoustic. In parallel with release 7.0, Audio Precision is also introducing APx500 software subscriptions, offering APx users an alternative in how they license APx software, and access nearly any software version and option.

Klippel New dB-Lab Version 212 and QC 7 Updates Extend Speaker and Enclosure Characterization Tools

July 1, 2021 by audioXpress Staff

Klippel New dB-Lab Version 212 and QC 7 Updates Extend Speaker and Enclosure Characterization Tools

Klippel released a major software update to its Klippel Analyzer System. The new dB-Lab Version 212 and QC 7 updates now add shared sensor management, support for the new Multi-Scanning Workbench hardware and three further modules (LSIM, MTON, RMA). The Klippel Multi-Scanning Workbench supports near-field holographic soundfield scanning measurements in a much smaller form factor, while the new modules add linear signal modeling and simulation and multi-tone measurements, dedicated to speaker and enclosure design.

Klippel Releases dB-Lab Software Update and new Application Notes

August 2, 2019 by audioXpress Staff

Klippel Releases dB-Lab Software Update and new Application Notes

Klippel's software dB-Lab version 210, the unified framework for R&D and QC audio testing, diagnostics and simulation, has received a free maintenance update. The update includes bug fixes and minor feature updates for released modules and beta test products like the Live Audio Analyzer (LAA). dB-Lab is a project-oriented Windows application that also features all sorts of templates for common test setups.

Listen Announces SoundCheck 17 Software Release

March 5, 2019 by audioXpress Staff

Listen Announces SoundCheck 17 Software Release

Listen announced the release of SoundCheck 17, the flagship Windows/Mac software from the Boston audio test and measurement specialists, now including many new features to simplify multi-channel and voice controlled testing, such as a new level and cross-correlation trigger, average curve/waveform post-processing functionality, the ability to easily read and work with multichannel WAV files, multiple DC Connect control, and enhanced database options - useful when processing data from a large number of channels.

NTi Audio Announces Smart Measurements for Smart Devices Using the Flexus FX100 Audio Analyzer

December 18, 2018 by audioXpress Staff

NTi Audio Announces Smart Measurements for Smart Devices Using the Flexus FX100 Audio Analyzer

Responding to the challenges that were brought to the audio industry by the sweeping popularity of connected speakers and smart home devices, Swiss test and measurement specialist NTi Audio just announced an open loop test solution for its FX100 Audio Analyzer system and produced a tutorial using an Amazon Echo Dot device to demonstrate how to test the device's loudspeaker and microphone array using an open loop configuration test sequence.

Listen Releases SoundCheck 16.1 with New Frequency Trigger for Open Loop Testing

October 5, 2018 by audioXpress Staff

Listen Releases SoundCheck 16.1 with New Frequency Trigger for Open Loop Testing

The audio measurement specialists at Listen announced the release of SoundCheck 16.1. This minor software release contains nevertheless some exciting new features for all developers and manufacturers working with connected audio devices, providing a test routine for smart speakers and other voice-controlled devices such as smartphones, robots, automotive audio, smart thermostats, hearables and more. The new software is available free of charge to all registered users of SoundCheck 16.0.

Audio Precision to Expand Audio Measurement Possibilities at 145th International AES Convention

September 12, 2018 by audioXpress Staff

Audio Precision to Expand Audio Measurement Possibilities at 145th International AES Convention

Audio Precision confirmed its planned contributions to the 145th International AES Convention happening in New York. AP’s participation in this key industry event includes both the technical program and the exhibition. The company will present a paper on how to measure audio when clocks differ and will conduct demonstration on open-loop testing. AES attendees can check out the latest in audio test or discuss their specific application with the AP team in Demo Suite #1E01.

Audio Precision Announces APx Audio Software v4.6 with Chirp-Based Measurements for Smart Device Testing

May 24, 2018 by Joao Martins

Audio Precision Announces APx Audio Software v4.6 with Chirp-Based Measurements for Smart Device Testing

Audio Precision announced the release of APx audio measurement software version 4.6, with a first public demonstration planned for the 144th International AES Convention in Milan. Included in this latest edition of the popular test software will be the ability to perform measurements using the log-swept sine chirp — such as acoustic response — in an open-loop configuration, an enhancement ideally suited to the test and evaluation of smart devices (e.g., smart speakers, smartphones).

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