Voice Commands Widget

Why use BNF format?

Voice command systems rely on grammars to interpret spoken input accurately. BNF lets you define the precise structure of valid commands, ensuring the system only recognizes intended phrases and rejects ambiguous or invalid inputs.

Here is a brief example of a voice commands grammar file. For more details, please refer to our dedicated documentation.

#BNF+EM V2.1;

!grammar VoicePickGrammar;

// Start rule for the grammar
!start <main>;

// Main rule that encompasses various ways someone might initiate a voice pick
<main>: <direct_pick> [<item>] [<quantity>];

// Direct commands for picking an item
<direct_pick>: "pick" | "select";

// Optional slot for specifying the item to pick
<item>: "item" | "product" | "object" | "thing";

// Optional slot for specifying the quantity of items to pick
<quantity>: "one" | "two" | "three" | "four" | "five";

...

How to use the Grammar AI Generator ?

Elaborate your prompt and paste it (1) to describe the expected behavior of your voice commands. The AI respects BNF standards and provides comments on its design choices.

Click Generate (2) to obtain a ready-to-use grammar in under 5 seconds. There are no limits, aside from decency, on using our AI tools within your project licensing.

Use Create a New Model (3) to save your current grammar. Your project can store an unlimited number of models.

Use Replace current grammar (4) to apply your newly generated grammar directly. Please note that lost grammar cannot be restored.

How to use the Translation AI Tool ?

Choose the Target Language (1), knowing that the source language is inherited from the Model’s Lang (2). Click Translate (3) to generate ready-to-use grammar in under 5 seconds. There are no limits, aside from decency, on using our AI tools under your project licensing. Finish by selecting Create as New Model (4).

How to create a Slot ?

First copy the name of your slot, then click on Define a Dynamic Slot (1). This will open a dedicated modal for creating the slot.

Click + button (2) to add a value to the slot. When editing a slot value in the dedicated field (3), press Enter to automatically create a new value - it is quickier. To remove a value, click the delete button (4). Do not forget to Confirm (5) otherwise your changes will not be saved.

How to edit a Slot ?

Create additional slots by repeating the steps above. For more details, see “How to create a Slot”. Edit slots with the Edit Slot (3) button and delete them with Delete Slot (4). Deleted slots cannot be recovered. Note that deleting a slot does not automatically update your grammar—you must remove it from the grammar separately.

How to read hypothesis ?

The key information is the Start rule. Most grammars have a single main rule, though multiple starting rules can be useful in certain cases.

• A confidence score of over 6000 (above the 4000 threshold) allows the hypothesis to be displayed.

• Alternative hypotheses contain the same information as the main hypothesis.

The hypothesis details show the confidence score for each entity within your voice commands, inside the whole utterance. It allows you to understand which part of the voice command is less understood by the technology.

What are recognizer options ?

Based on this documentation page containing Recognizer parameters, we provide the most used parameters that have a real impact in Quick Testing. Remember you can still change those parameters after Downloading the project.

TSILENCE: The silence period required to detect the Voice Command has elapsed. Any voice recognized afterward will be treated as a new Voice Command.

STREAM_RESULT_MODE: This means results will appear while you speak. Even if you do not pass the TSILENCE, "partial" results will still appear.

MAXNBEST: This value represents the maximum number of hypotheses considered and displayed in the test.