How Tos

Last reviewed: 2/1/2017

Article ID: H021701

HOW: Developing Microsoft HoloLens applications that speak and listen

The information in this article applies to:

  • SpeechKit 8


You can develop Microsoft HoloLens applications that speak and listen with SpeechKit.

More Information

The following sections describe the steps for integrating SpeechKit with Microsoft HoloLens applications.

SpeechKit Assemblies

SpeechKit includes UWP compatible .NET assemblies.

To access the SpeechKit .NET classes within your application, add them to your project References:

  1. Within your .NET project, right click on the References node in the Solution Explorer.
  2. Add references to the Chant shared and SpeechKit .NET assemblies:
    1. Program Files\Chant\SpeechKit 8\UWP\lib\Chant.SpeechKit.WindowsMedia.dll and
    2. Program Files\Chant\SpeechKit 8\UWP\lib\Chant.Shared.WindowsMedia.dll.

To access the SpeechKit .NET classes within your application, add references to the Chant shared and SpeechKit assemblies in your code.

using System;
using Chant.SpeechKit.WindowsMedia;
using Chant.Shared.WindowsMedia;

Speech Recognition

The following example illustrates using a command vocabulary.

private Chant.SpeechKit.NChantSR NChantSR1;
// Instantiate NChantSR object
NChantSR1 = new NChantSR();
// Setup event callback handler
NChantSR1.HasEvent += this.NChantSR1_HasEvent;
// Set license properties
NChantSR1.SetStringProperty(ChantStringProperty.CSPLicense, "LicenseRegistrationNumber");
NChantSR1.SetStringProperty(ChantStringProperty.CSPSerials, "LicenseSerialNumber");

// Register for command recognition event

// Define the vocabulary
NChantCommandVocab nChantCommandVocab = nChantSR.CreateChantCommandVocab("commands");

// Add commands to the vocabulary
nChantCommandVocab.AddCommand("Open File");
nChantCommandVocab.AddCommand("Print File");
nChantCommandVocab.AddCommand("Close File");
// Enable the vocabulary

private void NChantSR1_HasEvent(object sender, HasEventArgs e)
// Get the event from the event queue
NChantSREvent nChantSREvent = NChantSR1.GetChantSREvent();
switch (nChantSREvent.ChantCallback)
    case ChantCallback.CCSRHasCommand:
            // Handle command
// Remove the event from the event queue

Speech Synthesis

The following examples illustrate using the StartPlayback method to synthesize speech and playback audio.

private Chant.SpeechKit.NChantTTS NChantTTS1;
// Instantiate NChantTTS object
NChantTTS1 = new NChantTTS();
// Setup event callback handler
NChantTTS1.HasEvent += this.NChantTTS1_HasEvent;
// Set license properties
NChantTTS1.SetStringProperty(ChantStringProperty.CSPLicense, "LicenseRegistrationNumber");
NChantTTS1.SetStringProperty(ChantStringProperty.CSPSerials, "LicenseSerialNumber");

// Synthesize text to speech
NChantTTS1.StartPlayback("Hello world.");