Speech to Text and Text to Speech 25/Gnome

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I want to convert speech to text and back to speech again. What do I need to do this?

I've loaded festival and some voices. I tried to install perlbox; but it needed a tk dependency.

Thanks

PS., here's the error message:

[xxxxx@xxxxx ~]$ perlbox-voice Can't locate Tk.pm in @INC (you may need to install the Tk module) (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendorperl /usr/share/perl5/vendorperl /usr/lib64/perl5 /usr/share/perl5 .) at /usr/lib/perlbox-voice/pbox-voice line 7. BEGIN failed--compilation aborted at /usr/lib/perlbox-voice/pbox-voice line 7. [xxxxx@xxxxx ~]$