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Updated Digital voice DV over LoRa (markdown)

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sh123 2021-10-20 16:47:42 +03:00
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Digital-voice-DV-over-LoRa.md

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![alt text](https://raw.githubusercontent.com/sh123/esp32_loraprs/master/images/talkie.png)
- This modem could be used in conjunction with [Android Codec2 Walkie-Talkie](https://github.com/sh123/codec2_talkie), when application connects to the modem, instead of sending AX25 APRS packets it sends Codec2 speech encoded frames. This enables digital voice communicaiton between one or multiple modems.
- Select appropriate lora spread factor `cfg.LoraSf` and bandwidth `cfg.LoraBw` depending on Codec2 speech rate from 450-3200 bps. For example, if you are using 450 bps mode and 20 kHz bandwidth then set spreading factor to 6 or 7. See data rate table above.
- When using modem for voice communication `Loraprs::Service::CfgCsmaPersistence` must be set to maximum 255 value to disable CSMA, otherwise real time voice communication won't be guaranteed. Android codec2_talkie application automatically sets this parameter to 255 by using KISS P command code.