The word "synthesis" is a noun.

Shirai Katshuhiko has written:

'Recent progress in Japanese speech synthesis' -- subject(s): Speech processing systems, Speech synthesis

Speech recognition is the process of converting spoken words into text or commands, while speech synthesis is the process of generating spoken words from text or data input. In other words, speech recognition understands and interprets spoken language, while speech synthesis produces spoken language.

The conversion of written words into spoken words is called text-to-speech synthesis or speech synthesis. It is commonly used in computer systems to enable devices to speak out text.

Speak Recognition,Speaker Recognition, Speech coding, Voice analysis, Speech synthesis, Speech enhancement