It appears that the update released last night for TF2 has implemented the SILK codec, the same as Steam Voice Chat.
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Updated voice to use the Steam voice codec to improve quality
* Servers can toggle between the old codec and the new codec with the convar "sv_use_steam_voice", which defaults to 1.
Since the variable defaults to on, all new servers created in the future will be using the new codec unless they change that value. This means that the old voice chat will become less and less popular as new servers replace older ones. This may actually warrant an update to HLDJ since now we are going to need to work with two different standards, and switching between the two might be necessary especially if you play on multiple servers.
I've yet to test the new codec with HLDJ but I'm anticipating that it will not work with old micspam because the sampling rate and codec used is different. Here's a link to a small digest of information on the SILK codec:
I believe they will be using the "Wideband for all-IP platforms" standard, which has a sampling rate of 16kHz.
I wanted to start this thread for general discussion on this new codec. Servers can still use the old voice chat system and micspam of course will work perfectly, but I'd like to see HLDJ updated to take advantage of the higher quality. Please post any of your findings if you're trying to get HLDJ to work with the new codec.