Wireless Audio Will Stream from TVs - Why the Audio Industry Needs to Pay Attention

The wireless home theater is close to go mainstream and needs wireless speakers. WISA Technologies and DTS Play-Fi are embedding its multichannel wireless audio technology directly into SoC TV platforms. But they need to support Dolby Atmos. Now Dolby decided to try it out as well.

There are many aspects of negative feedback in audio that are the subject of continued discussion. Jan Didden continues to debunk more Audio Myths. This article addresses re-entrant distortion. The idea is that, since negative feedback sends some of the distorted output signal back to the input, this already-distorted signal would only get more distorted by going through the nonlinear amplifier, over and over again.

Alango’s SoundAround technology uses a sound acquisition module that attaches to the inside of a car window. At the heart of the module is the vibration sensor, or accelerometer, which records vibrations caused by sounds, both external and internal. Alango's patent-pending DSP software technology is used to clean up vibration sensor signals from components that correspond to sounds inside a car cabin.

This article, originally published in The Audio Voice newsletter (#434), explores some practical experiments with Negative Feedback. "If I had a dollar for every time someone mentioned that negative feedback cannot work, because you cannot correct something after it happened, I would be a rich man," says Jan Didden. "Yes, it can be hard to get your head around feedback circuits for audio amplifiers. Yet, all it takes is to look around you," he adds.

Modeling and Simulation and Measurement systems evolved significantly in the past decade. Important progress is now bridging the gap between COMSOL simulation and Klippel measurement data, Roger Shively reports after returning from Orlando, FL, where we attended another edition of the ALTI Expo & Conference (June 11-13, 2023). This article summarizes the content covered in a very important session as part of the APDA-ALTI Education Symposium 2023.

How well is the audio industry doing? Is there anything specific we in the audio industry can do, or are we just floating with the tide? Any attempt to characterize the state of the economy for the audio industry is limited to reading the signs from what are apparently very distinct, broader product segments. Yet, understanding these larger and wide-reaching product classes enables a better understanding of the overall macroeconomic picture and trends in consumer behavior.

What happens when you add Head-Tracking, Head Related Transfer Functions (HRTF), Room Impulse Responses (RIR), and Binaural Room Impulse Responses (BRIR)? Sharing his experience at the AES Europe 2023 Convention, held at Aalto University, Espoo, Helsinki, Finland (May 13 – 15), Jan Didden writes about listening to speakers on headphones and how good this is getting. How convincing is it? Very.

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.

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.

As it happens every year, Apple promoted its Worldwide Developers Conference (WWDC) from June 5–9, 2023. Did you notice Apple’s important breakthrough in headset audio design? It was easy to just be dazzled by all the technology involved in the Vision Pro, but this design was described as providing "mind-boggling audio fidelity" by those who tried it. The Vision Pro features an interesting audio system that was the focus for this editorial, together with Adaptive Audio and other important technology innovations.