Voice recognition

First steps, try to test using test mode.
Testing mode no needs to connect with Tello.

1. Export voice commands list to as a text file (json format) on setting tab.
   
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2. Switch on to test mode on main tab.
   
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3. Say command phrases while referring to the exported file. (I recommend you test all phrases)
   
   
4. When recognized a command is correct, the phrase will be shown on the left top.
   
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5. Off the test mode switch and microphone button on main tab.
   
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Notes:
If you can't do it in smooth, try to adjust levels for picking up a sound using OS settings, and try to speak up close for your microphone. or using other microphone.
Because internal microphone is an omnidirectional, so it's too sensitive against ambient noises.

I recommend external unidirectional microphone with anti-wind sponge. (Maybe internal microphone is not good.)

And also try to follwing switch. low recognition and confidence

Let's customize for your particular phrases in your country.

1. Export voice commands list to as a text file (json format) on setting tab. and back up the file.
   
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2. You can modify only command phrase and description.
   
   (Don't change of the each command name.)
   
   
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3. Each phrase is possible to add multiple phrases with delimiter of a half pitch semicolon(;) character.
   
   ex) takeoff;go;fly
   
   
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4. Import a your voice commands list file on setting tab.
   
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5. If you like to speak your commands in your country's language, select a language to match commands phrases.
   
   ex) modified in french.
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Notes:
Care to not mixed multiple languages for each command.

Care to not added too many phrases to each command. recommends less than around three phrases.

Let's try to take off using voice command phrase.

1. Click voice recognition button for starting.
   
   
2. Say a command phrase to take off.
   
   
3. After notified a message of '...Here you go', Say a next command phrase to operate.
   
   (ex. Forward, Rotate right, Up, etc)
   
4. Say a command phrase to stop or next operate.
   
   
5. Say a command phrase to land.
   
   
6. Click voice recognition button and end.
   
   

Notes:
If you switch to on by switch of 'automatic repeat sending', a command is sent repeat every receiving an OK response from tello until you say stopping or next phrase.
Its default value is off. I recommend to operation in an unchanged condition. Because automatic repeat sending will give internal load to Tello.
And also, it's possible to change using voice recognition.

Available voice commands are following table.
It will be added as required.