The speaker's voice refers to the individual whose voice is being synthesized. In some cases, the goal of speech synthesis is to mimic a specific person's voice, such as a famous actor or a well-known public figure. By incorporating the unique vocal characteristics, intonations, and mannerisms of the target speaker, the synthesized speech can sound more authentic and recognizable. Speaker adaptation techniques, such as speaker embeddings or transfer learning, can be employed to capture the specific attributes of the desired speaker and enhance the synthesis accordingly.