Google has shown that headphones equipped with active noise cancellation can be equipped with the ability to detect a person’s heart rate with just a software update.
As stated in the Google document, audio plethysmography (APG) allows noise-canceling headphones to track a user’s physiological signals, such as heart rate and heart rate variability, without adding additional sensors or compromising battery life. The technology demonstrates high resistance to artifacts arising from movement. In addition, measurements are not degraded depending on the ear pads used or skin color, and even simultaneous music playback does not interfere.
Google’s approach is based on the fact that the human ear canal contains many blood vessels, including the deep auricular artery. All of these vessels change their shape slightly under the influence of the heartbeat, which in turn leads to subtle but measurable changes in volume and pressure in the ear canal.
Existing active noise-cancelling headphones use microphones to do the noise-cancelling work. Microphones can be used to listen to your heartbeat and breathing. However, the microphones in consumer-grade ANC headphones have built-in high-pass filters that remove various noise. Information necessary for the specified task is also deleted.
Google says audio plethysmography bypasses the aforementioned hardware limitations of ANC headphones by sending a low-intensity ultrasound probe signal through the headphones’ speakers. This signal causes an echo, which is received by the built-in feedback microphones. In turn, tiny shifts in the skin of the ear canal and vibrations from the heartbeat affect this ultrasound echo, and the software allows these changes to be analyzed.
Google has already conducted two series of studies involving 153 people, which found that APG “provides consistently accurate measurements of heart rate (average error of 3.21% across participants across all activity scenarios) and heart rate variability (average error in beat interval 2. 70%).
Thus, everything depends only on the software. Well, it’s worth noting that this approach seems to work only with in-ear headphones. However, when such a solution will appear on the market is still unclear.
Noise reduction up to 52 dB, IP54, LHDC 5.0 and 38 hours of battery life for $55. Redmi Buds 5 Pro headphones presented
The range of Redmi wireless headphones has today been expanded with the Redmi Buds 5 Pro model. This is essentially an improved version of the Buds 5 headphones introduced in September. The Pro version has stronger active noise cancellation with three microphones and two speakers instead of one.
Each earphone has a 10mm tweeter and an 11mm bass driver, providing surround sound. The declared efficiency of the active noise reduction system is 52 dB, while three levels of “transparency” are provided (transmission of background noise). The design of Redmi Buds 5 Pro is the same as the regular version, it has IP54 protection and supports LHDC 5.0 codec.
The maximum autonomy is 38 hours (the headphones themselves can work up to 10 hours without noise cancellation and up to 6.5 hours with the ANC system activated). The Redmi Buds 5 Pro costs $55.
In addition to Redmi Buds 5 Pro, Redmi today presented the Redmi K70 Pro, Redmi K70 and K70E smartphones, Redmi Watch 4 smartwatches, RedmiBook 14 2024 and RedmiBook 16 2024 laptops.
A special version of Redmi Buds 5 Pro with orange accents will be released for the titanium Xiaomi 14 Pro
Lu Weibing, President of Xiaomi Group, President of the International Department and General Manager of the Redmi brand, announced details about the special version of the Redmi Buds 5 Pro headphones.
For “passionate gamers” a special esports version of Redmi Buds 5 Pro will be released. Its feature will be an ultra-low latency of 20 ms. Judging by the teaser, the inside of the charging case and the ear pads of the headphones will be orange, like the accents of the titanium Xiaomi 14 Pro.
Earlier it became known that Redmi Buds 5 Pro support fast charging and offer excellent battery life. With just 5 minutes of charging you can get up to 2 hours of device operation. The headphones last up to 10 hours on a single charge, and when using the charging case, the operating time increases to an impressive 38 hours. For Redmi Buds 4 Pro, these parameters were 9 and 36 hours, respectively.
The presentation will take place on November 29.
This is a record for Redmi: Redmi Buds 5 Pro headphones will work up to 38 hours without recharging. A 5-minute charge will last for 2 hours
Lu Weibing, president of Xiaomi Group, president of the international department and general manager of the Redmi brand, announced details about the Redmi Buds 5 Pro headphones.
According to him, Redmi Buds 5 Pro support fast charging and offer excellent battery life. With just 5 minutes of charging you can get up to 2 hours of device operation.
The headphones last up to 10 hours on a single charge, and when using the charging case, the operating time increases to an impressive 38 hours. For Redmi Buds 4 Pro, these parameters were 9 and 36 hours, respectively.
The presentation will take place on November 29.
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