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| − | ''The duplex conference feature has been upgraded in AMC 10.50. See [[Duplex Conference]] for description of the previous version. The remaining text describes the difference from the old version. This text will eventually be merged into the main article.''
| + | #REDIRECT [[Duplex Conference]] |
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| − | = Whats new =
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| − | == Up to 16 members in a duplex conference==
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| − | The max number of member in one single conference is now 16 (up from 4). It remains to be tested whether this is actually useable, in terms of audio quality. There are also a number of resource constraints that can limit the number of participants, see next section.
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| − | == Conversation timeout ==
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| − | The Conversation timeout is now active on duplex conference members, in exactly same way as in a normal conversation. Each member starts its own timer when joining the conference, so each member is disconnected individually when her time is out.
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| − | == Implementors comments ==
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| − | The original Duplex Conference shared little code with normal call setup. As the AlphaCom system has grown much more complex, this has become a large problem for maintainance. The new Duplex conference implementation is now some 70-80% reuse of the call setup handing. When a stations is included into a conference, a virtual "proxy station" is allocated, and mapped to the corresponding DSP conference port. From that point, normal call setup handling is used to connect to station to the conference mixing port. Handling of duplex, LEC, modules, AlphaNet and IP stations is basicly handled by the normal call handling. Conversation-timing, and M-key on duplex came as a bonus of the redesign.
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| − | The DSP conference mixing is quite simple and efficient. For each 16kHz period:
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| − | * Zero all conference sums
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| − | * Loop through all conference ports: add input sample to the conference sum (one sum variable for each conference)
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| − | * Loop through all conference ports again: Output sample is conference sum minus the port input sample
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| − | == Force old AGA conference ==
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| − | The old AGA based conferencing is still left as-is on the AMCD SW. In order to switch back to the old mode, a flag can be set using the [[TST#NVRAM_editor]]:
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| − | .ex_profile.flags.use_old_odc = 1
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| − | = Missing features =
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| − | * When someone include other stations into conference, the includer should become a "master" of the conference, so than when includer leaves the conference, the whole conference should be disconnected. Problem now is that it is easy to include an unattended station to a conference, which will remain busy in conference for ever / or until conversation timeout.
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| − | * Optimize VoIP connections (see above)
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| − | = Related articles =
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| − | [[Recording of conversations using Duplex Conference and AGA board]] | |
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| − | [[Category: AlphaCom features]]
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