mit-app-inventor

`SecretWord`

About this app

SecretWord is a speech-recognition app that mirrors the secret word of You Bet Your Life (1950–1960) with Groucho Marx. Secret Word to save the text box in the secret word. Stop to stop the speech recognizer. Image to start the speech recognizer. Then just speak!

Code

The Secret Word Button saves the text in the TextBox as the secret word..
The Stop Button stops the SpeechRecognizer.
Touching the image starts the SpeechRecognizer.

There were a couple things to learn about continuous speech recogntion in non-legacy mode:

The SpeechRecognizer detects utterances in the background and returns — in the AfterGettingText event — continuous recogntion results with partial == true as long as speech is detected. Once the utterance ends, partial == false, so the SpeechRecognizer must be restarted.
If the SpeechRecognizer detects no speech in the background, it will eventually time out in $approximately$ 5 seconds. In this case, the SpeechRecognizer must be restarted by a Clock event set to occur after that time out — in this code, the TimerInterval is set to 6000 ms (since the utterance time out has been empirically determined to be $approximately$ 5000 ms).
The Stop procedure will stop the SpeechRecognizer, but the documentation states that it, ‘works only when UseLegacy property is set to false.’

SecretWord also explores how to write scaled text on a Canvas — embodied in the display procedure.

Vincent De Oliveira (aka iamvdo) describes font-size, including how the font metrics define the em-square. The default font (sans-serif) has an em-square and FontSize that is 110% of the Canvas width divided by the length of the secret word. It is centered on the Canvas (with TextAlign centered) and surrounded by a rectangle one em-square tall and length-of-the-secret-word em-squares wide — clipped to the Canvas borders. The text is red within a black rectangle filled with white.

Designer

All components retain their default properties, — except Width and Height set to Fill parent... where necessary to center UX components.

Credits

Groucho image from Auralcrave
You Bet Your Life drop-down duck image from Invaluable
‘Say the secret word…’ audio from You Bet Your Life 54-18, 1955/01/13

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