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# Compatibility Notes

HPE IDOL Speech Server 10.8 introduced Deep Neural Network Acoustic Modeling. DNN modeling uses files with the extension `.dnn` in a Language Pack. Such language packs were introduced in HPE IDOL Speech Server version 6.0 or higher. In general, recent HPE IDOL Speech Server releases before 10.8 can still use these Language Packs, but they ignore the `.dnn` files and use only the underlying AM file for speech-to-text.

HPE IDOL Speech Server releases 10.10 and 10.11 also introduce additional support for new Language Pack Neural Network technologies. As such, version 7.X Language Packs require HPE IDOL Speech Server version 10.10 and version 8.X Language Packs require version 10.11. In both cases, using an older version of the server will either report a compatibility issue or progress without Neural Network technology.

Another notable change to Language Packs starting with version 6.0 is that many use a new format of Language Model (version 3). This means that for the first time, some older HPE IDOL Speech Server releases (specifically 10.3 and earlier) are incompatible with these newer Language Packs.

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