Skip to Content

Virtual Microphone

Until recently, concert recordings were made in stereo, with only left and right audio channels. The advent of digital-videodisc audio technology makes richer, six-channel reproductions possible, but only for musical events originally recorded on multiple channels. Reinventing the past, Chris Kyriakakis, co-director of the Immersive Audio Lab at the University of Southern California, has found a way to revamp existing recordings by “mapping” the concert halls where they were made. Kyriakakis places arrays of microphones around the venues, then electronically compares their signals to those of reference microphones placed where the mikes were located during the original recordings. This comparison yields enough information to translate the original recording into a six-channel recording. For Internet delivery, only one or two channels need be sent; the rest are generated at playback.

Keep Reading

Most Popular

A Roomba recorded a woman on the toilet. How did screenshots end up on Facebook?

Robot vacuum companies say your images are safe, but a sprawling global supply chain for data from our devices creates risk.

A startup says it’s begun releasing particles into the atmosphere, in an effort to tweak the climate

Make Sunsets is already attempting to earn revenue for geoengineering, a move likely to provoke widespread criticism.

10 Breakthrough Technologies 2023

Every year, we pick the 10 technologies that matter the most right now. We look for advances that will have a big impact on our lives and break down why they matter.

These exclusive satellite images show that Saudi Arabia’s sci-fi megacity is well underway

Weirdly, any recent work on The Line doesn’t show up on Google Maps. But we got the images anyway.

Stay connected

Illustration by Rose Wong

Get the latest updates from
MIT Technology Review

Discover special offers, top stories, upcoming events, and more.

Thank you for submitting your email!

Explore more newsletters

It looks like something went wrong.

We’re having trouble saving your preferences. Try refreshing this page and updating them one more time. If you continue to get this message, reach out to us at customer-service@technologyreview.com with a list of newsletters you’d like to receive.