How to use Text-to-Speech in Unity

How to use Text-to-Speech in Unity

Enhance your Unity game by integrating artificial intelligence capabilities. This Unity AI tutorial will walk you through the process of using the Eden AI Unity Plugin, covering key steps from installation to implementing various AI models.

What is Unity?

Established in 2004, Unity is a gaming company offering a powerful game development engine that empowers developers to create immersive games across various platforms, including mobile devices, consoles, and PCs. 

If you're aiming to elevate your gameplay, Unity allows you to integrate artificial intelligence (AI), enabling intelligent behaviors, decision-making, and advanced functionalities in your games or applications.

Unity Eden AI Plugin
GitHub Unity Eden AI Plugin

Unity offers multiple paths for AI integration. Notably, the Unity Eden AI Plugin effortlessly syncs with the Eden AI API, enabling easy integration of AI tasks like text-to-speech conversion within your Unity applications.

Benefits of integrating Text to Speech into video game development

Integrating Text-to-Speech (TTS) into video game development offers a range of benefits, enhancing both the gaming experience and the overall development process:

1. Immersive Player Interaction

TTS enables characters in the game to speak, providing a more immersive and realistic interaction between players and non-player characters (NPCs).

2. Accessibility for Diverse Audiences

TTS can be utilized to cater to a diverse global audience by translating in-game text into spoken words, making the gaming experience more accessible for players with varying linguistic backgrounds.

3. Customizable Player Experience

Developers can use TTS to create personalized and adaptive gaming experiences, allowing characters to respond dynamically to player actions and choices.

4. Innovative Gameplay Mechanics

Game developers can introduce innovative gameplay mechanics by incorporating voice commands, allowing players to control in-game actions using spoken words, leading to a more interactive gaming experience.

5. Adaptive NPC Behavior

NPCs with TTS capabilities can exhibit more sophisticated and human-like behaviors, responding intelligently to player actions and creating a more challenging and exciting gaming environment.

6. Multi-Modal Gaming Experiences

TTS opens the door to multi-modal gaming experiences, combining visual elements with spoken dialogues, which can be especially beneficial for players who prefer or require alternative communication methods.

Integrating TTS into video games enhances the overall gameplay, contributing to a more inclusive, dynamic, and enjoyable gaming experience for players.

Use cases of Video Game Text-to-Speech Integration

Text-to-Speech (TTS) integration in video games introduces various use cases, enhancing player engagement, accessibility, and overall gaming experiences. Here are several applications of TTS in the context of video games:

Quest Guidance

TTS can guide players through quests by providing spoken instructions, hints, or clues, offering an additional layer of assistance in navigating game objectives.

Interactive Conversations

Enable players to engage in interactive conversations with NPCs through TTS, allowing for more realistic and dynamic exchanges within the game world.

Accessibility for Visually Impaired Players

TTS aids visually impaired players by converting in-game text into spoken words, providing crucial information about game elements, menus, and story developments.

Character AI Interaction

TTS can enhance interactions with AI-driven characters by allowing them to vocally respond to player queries, creating a more realistic and immersive gaming environment.

Interactive Learning Games

In educational or serious games, TTS can assist in delivering instructional content, quizzes, or interactive learning experiences, making the gameplay educational and engaging.

Procedural Content Generation

TTS can contribute to procedural content generation by dynamically narrating events, backstory, or lore within the game, adding depth and context to the gaming world.

Integrating TTS into video games offers a versatile set of applications that go beyond traditional text presentation, providing new dimensions of interactivity, accessibility, and storytelling.

How to integrate TTS into your video game with Unity

Step 1. Install the Eden AI Unity Plugin

Eden AI Unit Plugin

Ensure that you have a Unity project open and ready for integration. If you haven't installed the Eden AI plugin, follow these steps:

  1. Open your Unity Package Manager
  2. Add package from GitHub

Step 2. Obtain your Eden AI API Key

To get started with the Eden AI API, you need to sign up for an account on the Eden AI platform

Once registered, you will get an API key which you will need to use the Eden AI Unity Plugin. You can set it in your script or add a file auth.json to your user folder (path: ~/.edenai (Linux/Mac) or %USERPROFILE%/.edenai/ (Windows)) as follows:

{ "api_key": "YOUR_EDENAI_API_KEY" }

Alternatively, you can pass the API key as a parameter when creating an instance of the EdenAIApi class. If the API key is not provided, it will attempt to read it from the auth.json file in your user folder.

Step 3. Integrate Text-to-Speech on Unity

Bring vitality to your non-player characters (NPCs) by empowering them to vocalize through the implementation of text-to-speech functionality. 

Leveraging the Eden AI plugin, you can seamlessly integrate a variety of services, including Google Cloud, OpenAI, AWS, IBM Watson, LovoAI, Microsoft Azure, and ElevenLabs text-to-speech providers, into your Unity project (refer to the complete list here).

Text-to-speech on Eden AI
Text-to-Speech on Eden AI

This capability allows you to tailor the voice model, language, and audio format to align with the desired atmosphere of your game.

1. Open your script file where you want to implement the text-to-speech functionality.

2. Import the required namespaces at the beginning of your script:

using EdenAI; using System; using System.Threading.Tasks;

3. Create an instance of the Eden AI API class:

EdenAIApi edenAI = new EdenAIApi();

4. Implement the SendTextToSpeechRequest function with the necessary parameters:

string provider = "amazon"; string text = "Hello how are you ?"; string audioFormat = "mp3"; TextToSpeechOption option = TextToSpeechOption.FEMALE; string language = "en"; string voiceModel = "en-US_Justin_Standard"; TextToSpeechResponse response = await edenAI.SendTextToSpeechRequest(provider, text, audioFormat, option, language, voiceModel: voiceModel);

Step 4: Handle the Text-to-Speech Response

The SendTextToSpeechRequest function returns a TextToSpeechResponse object.

Access the response attributes as needed. For example:

if (response.status == "success") { // Access the generated audio AudioClip generatedAudio =; // Handle the audio as needed in your Unity project } else { // Handle the case where the text-to-speech conversion fails }

Step 5: Customize Parameters (Optional)

The SendTextToSpeechRequest function allows you to customize various parameters:

  • Rate: Adjust speaking rate.
  • Pitch: Modify speaking pitch.
  • Volume: Control audio volume.
  • VoiceModel: Specify a specific voice model.
  • Include these optional parameters based on your preferences.

Step 6: Test and Debug

Run your Unity project and test the text-to-speech functionality. Monitor the console for any potential errors or exceptions, and make adjustments as necessary.

Now, your Unity project is equipped with text-to-speech functionality using the Eden AI plugin. Customize the parameters to suit your game's atmosphere, and enhance the immersive experience for your players.


TTS integration enhances immersion and opens doors for diverse gameplay experiences. Feel free to experiment with optional parameters for further fine-tuning. Explore additional AI functionalities offered by Eden AI to elevate your game development here

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