I am nearing the end development stages of a boat-based NR system running on a Pi and accessed with an Android-based tablet browser.
The system uses audio alerts and I have two choices, either creating lots of MP3 files for selective play-out or using TTS, with the latter being the most tidy and very flexible.
My question is generally about TTS voice options. Developing on a Windows machine rather spoils me for choice when looking for UK English female voices. However my operational platform is a Raspberry Pi and opening the Dashboard locally only offers a single voice option.
Whilst I'm sure the lady is jolly nice she is a little laid back for the warning alerts I am seeking. "Caution Low Bridge Ahead" is so comforting it almost makes me want to drift into it, yet the MS options are more assertive.
My questions are:
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Is TTS processed offline? [ My locations will be far away from any internet service]
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When viewing the Pi-served dashboard with an Android-based tablet browser, is the TTS processed on the Pi or the tablet? Is it the tablet or the Pi that is offering the single voice option?
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Is it possible to download different voice libraries?
Any pointers will be greatly appreciated.