Everything That's Audio in audioXpress December 2023

audioXpress December 2023 includes a market overview of multiroom audio, Brent Butterworth writes about new ways to measure ANC earbuds, and Stuart Yaniger measured the new Axign and GaN Systems Class-D audio amplifier board. Richard Honeycutt writes about tubes, BJTs, JFETs, MOSFETs, and ICs, and Dimitri Danyuk, discusses JFETs in audio circuits. Douglas Self explains how to optimize variable-frequency tone controls, and Jan Didden shares his eDD direct-drive amplifier project.

Asahi Kasei Microdevices Corporation (AKM) made two new product announcements focusing on 4-channel applications. The AK5704EN 4-channel 32-bit A/D audio converter was developed for high-quality low-power multi-microphone recording applications. Its built-in microphone amplifier and power supply make it an ideal solution for conference systems, microphone array systems or smart speakers. The also new AK7739VQ/AK7737VQ audio and voice processors are multicore units, designed for car audio, car navigation systems, and wireless speakers applications.

3PASS flex is HEAD acoustics new simulation system for measuring speech quality performance in the presence of background noise. It is particularly suited for testing multi-microphone systems, microphone arrays or beamforming microphones in real world conditions where multi-point noise simulation with flexible microphone and loudspeaker arrays is required. 3PASS flex reproduces any previously recorded sound field at distinct microphone positions, representative of typical use cases.