This chapter is intended to describe the current state and find out the problems which are needed to solve.
Hardware synthesizers are the devices, which may be connected to PC. Mostly they are external, connected via serial or parallel port. There are also some internal devices for ISA bus or USB. Application may send textual data to the port and the device converts it to spoken letters and words. Data may contain also several control sequences in the form of escaped characters as commands. The problem, we are facing, is that each of these devices uses its own communication protocol.
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Epos is czech GPL synthesis ...
IBM ViaVoice is a commercial product, but we see it to be very good. It is available for Linux, ....
MBrola is a software speech synhesis ...
Odmluva is a simple (and very light) czech software speech synhesis ...