text to speech mit app inventor

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Create a Powerful Text-to-Speech App with MIT App Inventor

Updated on Feb 12,2024

Table of Contents:

• Introduction
• Building the Soundboard App
• Using the Text-to-Speech Component
• Creating a Button for the App
• Implementing Text-to-Speech Functionality
• Adding a Text Box for User Input
• Connecting the Text Box to the Text-to-Speech Component
• testing the App

1. Introduction

Welcome to this Tutorial on building a text-to-speech app using MIT App Inventor. In this tutorial, we will be enhancing the soundboard app we created in the previous video by introducing a cool new component that App Inventor offers - the text-to-speech component. With this component, you will be able to synthesize any kind of text and have it spoken aloud by a computerized voice.

2. Building the Soundboard App

Before we dive into the text-to-speech functionality, let's briefly Recap the soundboard app we built in the previous tutorial. The app featured a button that, when pressed, played a sound. This app served as a foundation for our current project.

3. Using the Text-to-Speech Component

To add text-to-speech functionality to our app, we will be using the text-to-speech component provided by MIT App Inventor. This component allows your phone to convert any given text into speech.

4. Creating a Button for the App

First, let's create a button in the app's user interface. We will use this button to trigger the text-to-speech functionality. Unlike the previous app, we won't set a background image for the button. Instead, we will simply change the button's text to "Say Something" for now.

5. Implementing Text-to-Speech Functionality

To make the button perform an action when clicked, we will utilize the "when Button.Click" block in the blocks editor. Similar to how we used the sound component in the previous app, we will use the text-to-speech component's "call Speak" block. However, this block requires a message as input.

6. Adding a Text Box for User Input

To allow users to input their own messages, we need to add a text box to the app's user interface. The text box will serve as a space where users can enter the text they want the phone to speak aloud.

7. Connecting the Text Box to the Text-to-Speech Component

In the blocks editor, a new component will appear representing the text box we added. By exploring the available options for the text box component, we can find a block that retrieves the text entered by the user. This block, "TextBox1.Text," aligns with the text component of the text-to-speech component.

8. Testing the App

After connecting our device to the MIT App Inventor's companion app, we can test the functionality of our app. By typing different messages into the text box and clicking the button, we can verify that our app successfully converts the text to speech .

9. Conclusion

Congratulations! You have learned how to build a text-to-speech app using MIT App Inventor. You can now create your own apps that synthesize text into spoken words. This functionality opens up new possibilities for communication and accessibility in your mobile app projects.

高亮：Text-to-speech app, MIT App Inventor, soundboard app, button, user interface, blocks editor, text box, functionality, accessibility.

Q: What is MIT App Inventor? A: MIT App Inventor is a visual programming tool that allows you to easily create Android apps.

Q: Can I use the text-to-speech component in other app projects? A: Yes, the text-to-speech component can be used in any app project where you want to convert text into speech.

Q: Does the text-to-speech component support multiple languages? A: Yes, the text-to-speech component supports multiple languages, allowing you to synthesize speech in different languages.

Q: Can I customize the voice used by the text-to-speech component? A: Yes, you can customize the voice used by the text-to-speech component by adjusting the settings of your device's speech synthesizer.

Q: Are there any limitations to the length of the text that can be synthesized? A: The length of the text that can be synthesized may vary depending on the device and the text-to-speech engine being used. It is recommended to test longer texts to ensure optimal performance.

【Resources】:

• MIT App Inventor: https://appinventor.mit.edu/

The above is a brief introduction to Create a Powerful Text-to-Speech App with MIT App Inventor

Let's move on to the first section of Create a Powerful Text-to-Speech App with MIT App Inventor

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Table of Contents:

ImagePicker

Soundrecorder, speechrecognizer, texttospeech, videoplayer.

A component to record a video using the device’s camcorder. After the video is recorded, the name of the file on the phone containing the clip is available as an argument to the AfterRecording event. The file name can be used, for example, to set the source property of a VideoPlayer component.

Use a camera component to take a picture on the phone.

Camera is a non-visible component that takes a picture using the device’s camera. After the picture is taken, the path to the file on the phone containing the picture is available as an argument to the AfterPicture event. The path can be used, for example, as the Picture property of an Image component.

The FilePicker component is a button-like component that when clicked by the user will prompt them to select a file from the system. The picker can also be programmatically opened by calling its Open method. Using the FilePicker requires Android 4.4 or higher or iOS 11 or higher.

• Pick Existing File: Open an existing file
• Pick Directory: Open an existing directory
• Pick New File: Create a new file for saving

A special-purpose button. When the user taps an ImagePicker , the device’s image gallery appears, and the user can choose an image. After an image is picked, it is saved, and the Selection property will be the name of the file where the image is stored. In order to not fill up storage, a maximum of 10 images will be stored. Picking more images will delete previous images, in order from oldest to newest.

Multimedia component that plays audio and controls phone vibration. The name of a multimedia file is specified in the Source property, which can be set in the Designer or in the Blocks Editor. The length of time for a vibration is specified in the Blocks Editor in milliseconds (thousandths of a second).

For supported audio formats, see Android Supported Media Formats .

This component is best for long sound files, such as songs, while the Sound component is more efficient for short files, such as sound effects.

A multimedia component that plays sound files and optionally vibrates for the number of milliseconds (thousandths of a second) specified in the Blocks Editor. The name of the sound file to play can be specified either in the Designer or in the Blocks Editor.

For supported sound file formats, see Android Supported Media Formats .

This Sound component is best for short sound files, such as sound effects, while the Player component is more efficient for longer sounds, such as songs.

Multimedia component that records audio.

Use a SpeechRecognizer component to listen to the user speaking and convert the spoken sound into text using the device’s speech recognition feature.

Language is specified using a language tag with an optional region suffix, such as en or es-MX. The set of supported languages will vary by device.

The TextToSpeech component speaks a given text aloud. You can set the pitch and the rate of speech.

You can also set a language by supplying a language code. This changes the pronunciation of words, not the actual language spoken. For example, setting the Language to French and speaking English text will sound like someone speaking English (en) with a French accent.

You can also specify a country by supplying a Country code. This can affect the pronunciation. For example, British English (GBR) will sound different from US English (USA). Not every country code will affect every language.

The languages and countries available depend on the particular device, and can be listed with the AvailableLanguages and AvailableCountries properties.

The values should be between 0 and 2 where lower values lower the tone of synthesized voice and greater values raise it.

The default value is 1.0 for normal pitch.

The values should be between 0 and 2 where lower values slow down the pitch and greater values accelerate it.

The default value is 1.0 for normal speech rate.

Use this component to translate words and sentences between different languages. This component needs Internet access, as it will request translations from a server at MIT (which in turn will request translations from a commercial translation service). Specify the source and target language in the form source-target using two letter language codes. So “en-es” will translate from English to Spanish while “es-ru” will translate from Spanish to Russian. If you leave out the source language, the service will attempt to detect the source language. So providing just “es” will attempt to detect the source language and translate it to Spanish.

Note: Translation happens asynchronously in the background. When the translation is complete, the GotTranslation event is triggered.

Note: Translator will attempt to detect the source language. You can also specify prepending it to the language translation, e.g., es-ru will specify Spanish to Russian translation.

A multimedia component capable of playing videos. When the application is run, the VideoPlayer will be displayed as a rectangle on-screen. If the user touches the rectangle, controls will appear to play/pause, skip ahead, and skip backward within the video. The application can also control behavior by calling the Start , Pause , and SeekTo methods.

Video files should be in 3GPP (.3gp) or MPEG-4 (.mp4) formats. For more details about legal formats, see Android Supported Media Formats .

App Inventor only permits video files under 1 MB and limits the total size of an application to 5 MB, not all of which is available for media (video, audio, and sound) files. If your media files are too large, you may get errors when packaging or installing your application, in which case you should reduce the number of media files or their sizes. Most video editing software, such as Windows Movie Maker and Apple iMovie, can help you decrease the size of videos by shortening them or re-encoding the video into a more compact format.

You can also set the media source to a URL that points to a streaming video, but the URL must point to the video file itself, not to a program that plays the video.

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Voice recognition using app inventor

Can android phone recognize a recorded voice using app inventor? I don't know how I can match my recorded voice to speech recognition to activate the alarm.

• app-inventor

3 Answers 3

In designer's view:

• Create a button.
• Create a speech recognizer
• Create a text to speech

In blockers' view:

• add a button-clicked do block.Get speechRecognizer.getText
• add a speech recognizer afterGetttingText do block.Call textToSpeech.Speak

I don't know what app inventor is but google has an api for voice recognition. https://cloud.google.com/speech

• App inventor is a software that develops mobile app. I am trying to make a mobile app that will somehow activate an alarm using the voice which I recorded . Thanks anyway! –  Lei Commented Jun 30, 2017 at 10:39

App Inventor has Speech Recognizer Component that uses Google services for Speech Recognition The component will convert your Speech to Text

So you can compare the text output conversion for Triggering Alarm

• Please Note App Inventor does not have Background Service hence you will have to start the App for Voice Recognition –  Vincy Dsilva Commented Jul 20, 2017 at 6:08

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Hour of Code with MIT App Inventor

App Inventor is a free, cloud-based service that allows you to make your own mobile apps using a blocks-based programming language. You access App Inventor using a web browser (Chrome, Firefox, Safari). With these beginner-friendly tutorials, you will learn the basics of programming apps for Android and iOS phones or tablets.

You will need:

• A Mac or Windows computer ( see system requirements )
• A Wi-Fi connection

You will make a mobile app, so it's fun to see it run on a phone or tablet while you build the app (and after!). Some setup is required to run your apps.

Choose which way you want to connect to run your apps, and follow the links to setup instructions:

• Android or iOS device (phone or tablet) and Wi-Fi
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• On-screen emulator

If you hit any snags, we're here to help!

Teachers: Get support and tips for preparing for App Inventor hour of code with your students.

Making Mobile Apps with App Inventor

We have four tutorials to try out for the Hour of Code. We recommend starting with Hello Codi! , but any of the four tutorials are accessible for novice coders. They can all be completed within an hour timeframe.

For each tutorial, we have multiple ways of accessing them:

• Click the tutorial link to open up a project directly in the App Inventor environment with the tutorial in the sidebar. This is our recommended way to complete the tutorials.
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• We also have links to pdf files for each tutorial for those who prefer text instructions.

After building the starter apps, which will take around an hour, you can move on to extending them with more functionality, or you can start building apps of your own design.

Hello Codi!

Get started by making Codi the Bee buzz when touched!

Talk to Me (2 parts)

Text to Speech is surprisingly fun. Find out for yourself with this starter app that talks.

Talk to Me (Part 2)

Ball bounce.

Fling, Flang, Flung? Whatever you call it, bouncing the ball around the screen is pure fun.

Digital Doodle

Who needs paper? Doodle all day on your phone's screen.

Trouble with the Text-To-Speech player on your phone? Get help here .

We've got 4 more tutorials to try out for the Hour of Code!

What's Next?

You just made some pretty cool apps! But now the real fun begins: try turning TalkToMe into a Magic 8 Ball ; turn BallBounce into a Mini Golf game , take DigitalDoodle to the next level by adding colors and incorporating pictures as backgrounds in PaintPot . The possibilities are endless!

See the complete collection of Tutorials for more ideas.

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