Researchers at Cornell University have developed a wearable with batlike sonar that could improve upper-body tracking in virtual reality and other applications. The Cornell team fitted a generic pair of eyeglasses with a tiny sonar system, demonstrating how acoustic signals can be used instead of cameras to capture the body’s movement. 

Not only would sonar be more efficient in terms of battery consumption, the team told the Cornell Chronicle, but it would also do away with the privacy risks that come with headsets’ externally facing cameras. The system, dubbed PoseSonic, uses two pairs of microphones and speakers to send and receive acoustic signals, according to a recently published paper. With help from their deep learning model, it can then estimate 3D poses at nine different points — the shoulders, elbows, wrists, hips and nose — as these signals bounce off the upper body.

The team tested it both in the lab and “semi-in-the-wild,” and found it wasn’t negatively affected by environmental noise in any significant way. With this technique, “we use less instrumentation on the body, which is more practical, and battery performance is significantly better for everyday use,” senior author Cheng Zhang told the Cornell Chronicle.

In addition to its potential use in augmented and virtual reality, the researchers say sonar could make for better health tracking by capturing more detailed information on the body’s movements. They’ve only got the upper-body covered at the moment, though — VR legs continue to elude us.

Researchers at Cornell University have developed a wearable with batlike sonar that could improve upper-body tracking in virtual reality and other applications. The Cornell team fitted a generic pair of eyeglasses with a tiny sonar system, demonstrating how acoustic signals can be used instead of cameras to capture the body’s movement. 

Not only would sonar be more efficient in terms of battery consumption, the team told the Cornell Chronicle, but it would also do away with the privacy risks that come with headsets’ externally facing cameras. The system, dubbed PoseSonic, uses two pairs of microphones and speakers to send and receive acoustic signals, according to a recently published paper. With help from their deep learning model, it can then estimate 3D poses at nine different points — the shoulders, elbows, wrists, hips and nose — as these signals bounce off the upper body.

The team tested it both in the lab and “semi-in-the-wild,” and found it wasn’t negatively affected by environmental noise in any significant way. With this technique, “we use less instrumentation on the body, which is more practical, and battery performance is significantly better for everyday use,” senior author Cheng Zhang told the Cornell Chronicle.

In addition to its potential use in augmented and virtual reality, the researchers say sonar could make for better health tracking by capturing more detailed information on the body’s movements. They’ve only got the upper-body covered at the moment, though — VR legs continue to elude us.

Discord is changing its approach to file hosting in an effort to crack down on malware. The platform will begin using temporary file links that will expire after 24 hours for user content shared outside of Discord, BleepingComputer reported. The change is expected to go into effect by the end of the year.

While the stated intention of the move is to crack down on malware, it’ll also curb the wider use of Discord as an unofficial file hosting service. It’s not uncommon for users to upload images and other content to their own servers and then post those links elsewhere. You won’t be able to do that as smoothly anymore once it makes the move away from permanent file links, because the links will go dead after a day. Nothing will change for content posted and shared within Discord itself.

Switching to temporary file links “will help our safety team restrict access to flagged content, and generally reduce the amount of malware distributed using our CDN [content delivery network],” a spokesperson for Discord told BleepingComputer. Discord also noted, “If users are using Discord to host files, we'd recommend they find a more suitable service.”

X has been trying to find buyers for user handles it reclaimed from inactive accounts, even going so far as to send out solicitation emails asking for “a flat fee of $50,000 to initiate a purchase,” according to Forbes. Elon Musk announced back in May that X, formerly Twitter, would start purging accounts that have gone dormant, and has alluded to plans for recycling disused handles.

According to emails seen by Forbes, X now has a task force called the “@Handle Team” that’s working on creating a marketplace for buying handles tied to inactive accounts. X changed its policy this year to stipulate that users must log in every 30 days to remain active, and risk having their accounts suspended or permanently removed if they go long enough without signing on. It’s unclear how long a user would have to remain inactive for to actually be booted from the platform. After NPR quit the site this past spring, Musk began threatening to reassign its handle just a few weeks later.

As of now, obtaining another user’s inactive handle doesn’t seem to be something just anybody can do. X’s website still says it cannot release inactive usernames. But, the Forbes report suggests the company is looking at the possibility of a handle marketplace as yet another way to pull in money from its users. The company just recently introduced two new subscription tiers for paid users: a $16 per month Premium+ tier and a more pared-down $3 per month “basic” tier.