4 ms·

Does Bluetooth support binary transfer? Why can’t it be just a dumb wireless data transfer protocol. Instead you have profiles and lossy compression. Turn on a

Does Bluetooth support binary transfer? Why can’t it be just a dumb wireless data transfer protocol. Instead you have profiles and lossy compression. Turn on a mic and the quality drops to phone quality 30 years ago.

tedunangst 5y ago
It's not infinite bandwidth.
- Google234 5y ago
  It has plenty of bandwidth. MB/s
  - deleted 5y ago
    [deleted]
  - Kirby64 5y ago
    Source? The only option that I'm aware of that exists in Bluetooth spec is an optional add-on that basically initiates an 802.11 (WiFi) ad-hoc link for faster transfer. Not really suitable for audio. Max bandwidth for regular Bluetooth is around 3 Mbit/s, to my knowledge. Bluetooth LE is lower at 2 Mbit/s.
    - js2 5y ago
      2 Mbit/s is the physical bit rate using LE 2M. After accounting for protocol overhead, the max data rate is about 1.4 Mbps. https://www.novelbits.io/bluetooth-5-speed-maximum-throughput/ https://www.novelbits.io/bluetooth-5-speed-maximum-throughpu...
      - aidenn0 5y ago
        Coincidentally (or not?) That's the bitrate of uncompressed CDDA. I suspect the real-word data rate is lower though. In any event 300kbps is more than sufficient for transparent compression of audio and, if the source is lossless, then you shouldn't have recompression artifacts. Doing so in real-time does have costs (low latency compression uses both more CPU time and ends up with higher bitrates than when you allow more latency)
  - toomanybeersies 5y ago
    What's the latency like at high bitrates though?
- rasz 5y ago
  Apple BT supports up to 8Mbit/s, far above 1.5Mbit/s needed for CD transparent transfer with no data compression.
  - fomine3 5y ago
    Non-adaptive high bitrate is only possible if all customers allow massive audio stuttering.
solarkraft 5y ago
There are „just data“ profiles. The issue is nobody has actually thought up a protocol for it. A funny thing I‘d do if I had more time and energy to dedicate to the topic of Bluetooth telephony (HSP and HFP are garbage for arbitrary reasons) would be opening a network and doing reasonable quality telephony over it to demonstrate it‘s possible.
deleted 5y ago
[deleted]

tedunangst 5y ago

It's not infinite bandwidth.

Google234 5y ago
It has plenty of bandwidth. MB/s
- deleted 5y ago
  [deleted]
- Kirby64 5y ago
  Source? The only option that I'm aware of that exists in Bluetooth spec is an optional add-on that basically initiates an 802.11 (WiFi) ad-hoc link for faster transfer. Not really suitable for audio. Max bandwidth for regular Bluetooth is around 3 Mbit/s, to my knowledge. Bluetooth LE is lower at 2 Mbit/s.
  - js2 5y ago
    2 Mbit/s is the physical bit rate using LE 2M. After accounting for protocol overhead, the max data rate is about 1.4 Mbps. https://www.novelbits.io/bluetooth-5-speed-maximum-throughput/ https://www.novelbits.io/bluetooth-5-speed-maximum-throughpu...
    - aidenn0 5y ago
      Coincidentally (or not?) That's the bitrate of uncompressed CDDA. I suspect the real-word data rate is lower though. In any event 300kbps is more than sufficient for transparent compression of audio and, if the source is lossless, then you shouldn't have recompression artifacts. Doing so in real-time does have costs (low latency compression uses both more CPU time and ends up with higher bitrates than when you allow more latency)
- toomanybeersies 5y ago
  What's the latency like at high bitrates though?
rasz 5y ago
Apple BT supports up to 8Mbit/s, far above 1.5Mbit/s needed for CD transparent transfer with no data compression.
- fomine3 5y ago
  Non-adaptive high bitrate is only possible if all customers allow massive audio stuttering.

solarkraft 5y ago

There are „just data“ profiles. The issue is nobody has actually thought up a protocol for it. A funny thing I‘d do if I had more time and energy to dedicate to the topic of Bluetooth telephony (HSP and HFP are garbage for arbitrary reasons) would be opening a network and doing reasonable quality telephony over it to demonstrate it‘s possible.

deleted 5y ago

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