Not sure why these TWE manufacturers are not using higher capacity Varta button cells that have been available for more than several years now.
https://incompliancemag.com/li-ion-...rget-bluetooth-portable-and-wearable-devices/
Only Bragi, as used as an example by Varta in their English pdf, has apparently older cp1624 A2 @100mah, while cp1654 A3 is now @120mah as indicated in Varta’s pdf, 2x capacity of most TWE batteries in use.
https://products.varta-microbattery...e_TrueWirelessSmartEarphones_CoinPower_en.pdf
Any other DIY ppl here notice that also the CP1654 A3 has 2C as max continuous discharge current, as well as 3C for 2seconds? only interesting if you could make a magnetic or similar, quick-change battery, that would slap-on the outside cover, so you could change a bunch of them out, ASAP. What kind of drivers need lotsa current/voltage to operate, such that there are no TWEs of them yet??? J
https://www.jlabaudio.com/products/jbuds-air-true-wireless-earbuds-charging-case. Other than Apples Airpods, which are not yet BT5.0 compliant but supposedly are BT class 1 output power, couldn’t find a TWE at any price range that outputs as the high power rate of 100mw, BT5.0 class 2, typical, is 2.5mw…substantial difference.
A Primer on Bluetooth 5: Everything You Need to Know Before Integrating Your IoT Product
https://mindtribe.com/2018/04/a-primer-on-bluetooth-5/
- “There are now four classes of Bluetooth devices, grouped by transmit power. Bluetooth 5 adds Class 1, which provides a significantly higher maximum transmit power.
There are a few subtleties to the interactions of the above points which may not be obvious at first glance:
- Bluetooth 5 does not specify an increase in MTU size or minimum connection parameters when compared to Bluetooth 4.2 + LE. If you’re using the 1M PHY (the only one available to previous versions of BTLE) a Bluetooth 5 device and a Bluetooth 4.2 device will perform identically.
- As far as we can tell, there are phones which support the 2M PHY (Galaxy S8/S8+/S9/S9+, iPhone 8/8 Plus/X) but none which support the lower speed/longer range PHYs. This means, as of now, there are no phones which can make use of the new long-range features in Bluetooth 5. This could potentially change with firmware updates to these phones.
- The long-range extensions and higher speed 2M PHY are mutually exclusive. They are also completely independent of any transmit power settings a given board may provide.”
So, if you’ve got BT5.0 TWEs but a phone that doesn’t implement PHY LE 2M protocol, instead of PHY LE 1M (1Mbs), you’re not getting any increases!
Dispelling Common Bluetooth Misconceptions
https://www.sans.edu/cyber-research/security-laboratory/article/bluetooth
https://blog.bluetooth.com/exploring-bluetooth-5-how-fast-can-it-be
Conclusion
For Bluetooth low energy throughput in theory, the chart below illustrates the differences between the Bluetooth low energy specifications. You can see that Bluetooth 5 has a bandwidth that is ~4.6-times greater than 4.0/4.1 and ~1.7-times greater than 4.2. Higher bandwidths can translate into higher speeds,
this will allow Bluetooth low energy to transmit data streams faster than ever before - more efficient, less band occupation, and more suitable for rapid data transmission. For application scenarios like Over-The-Air firmware upgrades, or wearable device data log synchronization, Bluetooth 5 will enable brilliant user experiences, while higher speeds will build a solid platform for future high data rate stream transmissions.”
Could not get the image to paste above showing comparison of data rates, but calculation shows.
For Bluetooth 5 throughput, the calculation is:
And so we see that the quote below is not telling you that LDAC is only going to be able to stream at lower data rates with BT4.0 or even BT4.2, only if BT5.0 is at maximum will you get that desired 990kbs of LDAC< if you don’t have BT5.0 LE 2M protocol implemented on both sending & receiving devices, no LDAC higher bit rates will happen. Probably need BT LE 2M to even get max rates with Aptx HD.
https://blog.bluetooth.com/what-bluetooth-developers-should-know-about-android-o
Bluetooth Audio
Android O also released additional support for Sony LDAC[3]. LDAC is an audio coding technology developed by Sony that enables the transmission of High-Resolution (Hi-Res) Audio content, even over a Bluetooth connection. This technology can improve the transmission throughput of Bluetooth audio signals at a maximum of 990kbps. With LDAC support, LDAC-enabled headsets and speakers would be able to connect with Android O devices and have a high-quality audio experience.
LDAC has 3 options for transmission rate:
- 990kbps, Quality priority mode
- 660kbps, Normal mode
- 330kbps, Connection priority mode
It looks like
Android O also supports Qualcomm’s aptX and aptX-HD as well, giving developers plenty of options for using audio over Bluetooth.