Princeton University  


Research Projects and Emerging Audio Technologies


1. BACCH3D Sound

BACCH3D Sound (previously called "Pure Stereo 3D Audio") is a recent breakthrough in audio technology, based on BACCH Filters, (and licensed by Princeton University) that yields unprecedented spatial realism in loudspeakers-based audio playback allowing the listener to hear, through only two loudspeakers, a truly 3D reproduction of a recorded soundfield with uncanny accuracy and detail, and with a level of high tonal and spatial fidelity that is simply unapproachable by even the most expensive and advanced existing high-end audio systems. Learn more about BACCH3D Sound through these 20 Questions and Answers.


2. BACCH Filters: Optimized Crosstalk Cancellation for 3D Audio Over Two Loudpseakers

BACCH Filters are optimized crosstalk cancellation (XTC) filters that allow 3D audio reproduction over a pair of loudspeakers. They yield maximum crosstalk cancellation level without introducing any spectral coloration to the input signal. An introduction to BACCH filters can be found here.

BACCH filters are at the heart of BACCH3D Sound , Dynasonix and other emerging technologies from the 3D3A Lab.


3. Loudspeaker Directivity: An Experimental Survey

Loudspeaker Directivity is the extent to which loudspeakers beam the sound towards the listener instead of broadcasting it in all directions around the room. Loudspeaker directivity is the single most important loudspeaker property for 3D audio with crosstalk cancellation, since room reflections directly degrade the level of crosstalk cancellation. Consequently, the 3D3A lab is conducting detailed measurements of the directivity of various loudspeakers measured in the lab's anechoic chamber. At present the database contains the measured directivity data for six loudspeakers.


4. 3D Audio for 3D TV

The 3D3A Lab is developing 3D audio for 3D TVs and other 3D video and cinema applications. The approach relies on advanced loudspeaker and DSP technologies. Visit this webpage to learn about the latest development.


5. Advanced Hearing Aids for the Hearing Impaired

The 3D3A Lab is developing techniques for improving the sound localization capability of hearing aids for the hearing impaired. More on this will soon be published on this webpage.


6. Princeton Headphone Open Archive (PHOnA)

The Princeton Headphone Open Archive (PHOnA) is a dataset of measured headphone transfer functions (HpTFs) from many different research institutions around the world. Visit this webpage to access the dataset.