AnalysisHuh, this is what you call a mobile phoneDo you know the voice of that mobile phone is actually someone else's?Voice libraryThere'd be too much traffic if it was the raw voice, so a machine analyzes its characteristics and synthesizes the most similar one from the codebook, and sends it to the other side.Is this it?Uncountable voices are recorded in the codebook, it's like a voice library.But Reimu doesn't have the voice of a middle-aged man?The codebook only has two voices: Tesshō Genda and Akio Otsuka.It's more like Pop Team Epic...
