11.0

Chapter 1: Introduction to Dragon 11
Using multiple acoustic models with a
User Profile
If the computer that a user dictates on meets certain system requirements, Dragon 11 uses two
acoustic models with a User Profile. Using two acoustic models instead of one improves rec-
ognition and dictation accuracy. Acoustic models that can be added in pairs to a User Profile are
called BestMatch IV models.
Any time you add a new dictation source to a User Profile that uses two BestMatch IV models,
the dictation source will also be associated with the two models.
A User Profile with two BestMatch IV models uses more computer resources, including RAM
memory, than a User Profile with one acoustic model. Dragon 11 uses two BestMatch IV models
on a multi-core computer with at least 2 GB RAM. Dragon 11 recognizes when it is installed on a
computer that meets these system requirements and selects the BestMatch IV acoustic model as
the default.
Dragon 11 does not provide BestMatch IV acoustic models for the following models/regions:
n Teens (11k and Bluetooth)
n United Kingdom, Australia (Bluetooth)
n Indian Subcontinent, Southeast Asia (11k and Bluetooth)
Acoustic Optimization for User Profiles with
BestMatch IV acoustic models
If a User Profile includes BestMatch IV models, you must run the Acoustic and Language Model
Optimizer (ACO) on a computer with multi-core processors. Dragon 11 uses two BestMatch IV
models only on a multi-core computer with at least 2 GB of RAM.
If the ACO processes a User Profile that was created on a computer with multi-core processors,
the optimizer always selects the BestMatch IV models to optimize.
If a User Profile is associated with BestMatch III models without accents, and you run the opti-
mizer on a computer that supports BestMatch IV models, if automatic acoustic model selection is
enabled, the optimizer will automatically choose a BestMatch IV model to optimize.
Multiple acoustic models and User Profiles on single
and multi-core computers
If a user creates a User Profile on a multi-core computer, when the user opens the User Profile on
a single-core computer, Dragon uses the first acoustic model for recognition. Dragon does not
load the second acoustic model.
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