3 ms·

Check out also Codec2, Open Source as well, which offers really good quality down to 700 bit/s. It has been ported to small MCUs such as the ESP32, STM32 etc. a

Check out also Codec2, Open Source as well, which offers really good quality down to 700 bit/s. It has been ported to small MCUs such as the ESP32, STM32 etc. also supported by Arduino libraries. https://www.rowetel.com/?page_id=452 https://www.rowetel.com/?page_id=452 https://github.com/deulis/ESP32_Codec2 https://github.com/deulis/ESP32_Codec2 https://www.arduino.cc/reference/en/libraries/codec2/ https://www.arduino.cc/reference/en/libraries/codec2/

throw0101a 4y ago
> Check out also Codec2, Open Source as well, which offers really good quality down to 700 bit/s Yes, but it tops out at 3200b/s: * https://en.wikipedia.org/wiki/Codec_2 https://en.wikipedia.org/wiki/Codec_2 Lyra V2 seems to start there and then goes up to teens of kb/s, at which point Opus can perhaps take over the job.
- squarefoot 4y ago
  Yes, that is done on purpose. The goal of the project is to be used in HF/VHF voice communications so it makes sense. That low bandwidth usage allows it to be employed from ordinary HAM gear down to cheap LoRa modules, a feature that opens huge possibilities like building point to point or multipoint encrypted communications with portable devices not tied to cellphone towers, which in some areas of the world would be so useful these days.
  - FatCatsClub 4y ago
    >employed from ordinary HAM gear down to cheap LoRa modules, a feature that opens huge possibilities like building point to point or multipoint encrypted communications I hope you aren't suggesting that encryption should be used on amateur bands.
    - dmos62 4y ago
      Is that not a good idea?
      - londons_explore 4y ago
        It's a can-of-worms topic...
      - mgsouth 4y ago
        It's not legal. Most countries prohibit encryption of Amateur Radio transmissions in most cases. Some countries have exceptions such as emergency communications or satellite control. [0] [0] https://ham.stackexchange.com/questions/72/encrypted-traffic-and-amateur-radio https://ham.stackexchange.com/questions/72/encrypted-traffic...
    - gortn 4y ago
      It's not a big deal, there's rarely any enforcement of this, no-one cares except for the usual angry hams.
      - gilrain 4y ago
        That’s how the commons gets tragedied…
    - squarefoot 4y ago
      Of course not; I'm aware that encryption is illegal in HAM bands, I was referring to other uses in emergency situations.
  - jimmySixDOF 4y ago
    You mean like the Helium network where they are trying to get enough users with LoRa boxes to replace the telcos ? [1] https://www.helium.com/ https://www.helium.com/
    - simfree 4y ago
      Helium's LoRa network has a vanishingly small number of paying users despite it's size. Great move for a pump and dump scheme tho, now they are moving onto CBRS LTE with a whole new token separate from HNT.
haberman 4y ago
It's astounding to me that you can get intelligible speech at seven 700 bps. 700 bits is less than the ASCII of this comment.
- londons_explore 4y ago
  Have fun reading that comment out loud in 1 second.

throw0101a 4y ago

> Check out also Codec2, Open Source as well, which offers really good quality down to 700 bit/s Yes, but it tops out at 3200b/s: * https://en.wikipedia.org/wiki/Codec_2 https://en.wikipedia.org/wiki/Codec_2 Lyra V2 seems to start there and then goes up to teens of kb/s, at which point Opus can perhaps take over the job.

squarefoot 4y ago
Yes, that is done on purpose. The goal of the project is to be used in HF/VHF voice communications so it makes sense. That low bandwidth usage allows it to be employed from ordinary HAM gear down to cheap LoRa modules, a feature that opens huge possibilities like building point to point or multipoint encrypted communications with portable devices not tied to cellphone towers, which in some areas of the world would be so useful these days.
- FatCatsClub 4y ago
  >employed from ordinary HAM gear down to cheap LoRa modules, a feature that opens huge possibilities like building point to point or multipoint encrypted communications I hope you aren't suggesting that encryption should be used on amateur bands.
  - dmos62 4y ago
    Is that not a good idea?
    - londons_explore 4y ago
      It's a can-of-worms topic...
    - mgsouth 4y ago
      It's not legal. Most countries prohibit encryption of Amateur Radio transmissions in most cases. Some countries have exceptions such as emergency communications or satellite control. [0] [0] https://ham.stackexchange.com/questions/72/encrypted-traffic-and-amateur-radio https://ham.stackexchange.com/questions/72/encrypted-traffic...
  - gortn 4y ago
    It's not a big deal, there's rarely any enforcement of this, no-one cares except for the usual angry hams.
    - gilrain 4y ago
      That’s how the commons gets tragedied…
  - squarefoot 4y ago
    Of course not; I'm aware that encryption is illegal in HAM bands, I was referring to other uses in emergency situations.
- jimmySixDOF 4y ago
  You mean like the Helium network where they are trying to get enough users with LoRa boxes to replace the telcos ? [1] https://www.helium.com/ https://www.helium.com/
  - simfree 4y ago
    Helium's LoRa network has a vanishingly small number of paying users despite it's size. Great move for a pump and dump scheme tho, now they are moving onto CBRS LTE with a whole new token separate from HNT.

haberman 4y ago

It's astounding to me that you can get intelligible speech at seven 700 bps. 700 bits is less than the ASCII of this comment.

londons_explore 4y ago
Have fun reading that comment out loud in 1 second.