If you think about this you'll realize that it is impossible to detect tone from text because it's not possible to convey tone with text alone. Tone is auditory

If you think about this you'll realize that it is impossible to detect tone from text because it's not possible to convey tone with text alone. Tone is auditory, text is visual, and there is no way to recover one from the other. For an obvious demonstration of this watch a movie on mute and then listen to the audio of the movie without the accompanying visuals.