Re: [Freetel-codec2] Comments on the M17 project

Adrian… interesting.. thanks for tip… will look into that for DATV www.slatsatn.net Mel K0PFX From: Adrian Musceac Sent: Monday, October 26, 2020 9:48 AM To: freetel-codec2@lists.sourceforge.net Subject: Re: [Freetel-codec2] Comments on the M17 project

Re: [Freetel-codec2] Comments on the M17 project

Other strange stuff I got Mumble to do was rebroadcast digital video frames from the network over the air in the 1.2 GHz band. The protocol itself is crazy extensible and the server I use is lightweight and written in C, unlike the somewhat bloated official server, Murmur. Adrian YO8RZZ On

Re: [Freetel-codec2] Comments on the M17 project

Yes, Mumble is popular with QRQ CW ops also. THey run a Mumble server providing low latency QSOs for speeds up to and sometimes exceeding 100wpm. http://qrqcwnet.ning.com/ Mel K0PFX From: Adrian Musceac Sent: Monday, October 26, 2020 6:42 AM To: freetel-codec2@lists.sourceforge.net

Re: [Freetel-codec2] Comments on the M17 project

Al, That's exactly what my FreeDV application does except 1. It uses a general purpose voip protocol (Mumble) which can be extended with arbitrary codecs including Codec2 2. It doesn't use the cloud. It uses a simple TCP server which can be hosted anywhere and which allows multiple rooms to

Re: [Freetel-codec2] Comments on the M17 project

The possibilities are endless … Regards David Grove david.gr...@fastmail.com.au +61-419-444-496 From: Al Beard via Freetel-codec2 Sent: Monday, 26 October 2020 22:16 To: freetel-codec2@lists.sourceforge.net Cc: Al Beard Subject: Re:

Re: [Freetel-codec2] Comments on the M17 project

Hi David VK2DWG, Consider a HF "hot spot". Can receive say mode 700D which uses the mode 700C codec. adds the hot-spot callsign and sends to the cloud talk group HF1 and listeners treat it like any other talk group except, in his radio, his radio recognises it is mode 700C data and de-codecs

Re: [Freetel-codec2] Comments on the M17 project

Hi Walter, Not quite:  https://m17-protocol-specification.readthedocs.io/en/latest/data_link_layer.html Table 4 Bitfields of type field Bits Meaning 0 Packet/stream indicator, 0=packet, 1=stream 1-2 Data type indicator, 012012 =data (D), 102102 =voice (V), 112112 =V+D, 002002  =reserved

Re: [Freetel-codec2] sweet spot?

Hello Tom, Not really, there's a "energy" parameter in each frame that ideally makes performance independent of the input speech energy/level. Suggest you keep away from clipping, so +/-16000 peak is a reasonable level to shoot for. - David On 26/10/20 8:22 am, Tom Early wrote: > Is there an