As many have pointed here Mandarin, Thai, Cantonese and Vietnam are tonal languages and the meaning of words are depending on how you speak the syllables inside the words. Mandarin has four, Thai has five, Cantonese has six and Vitnamese has six tones. Overall about 20% or 1.5 billion of the world's population converse daily in tonal languages.
It will be very helpful if someone come up with automatic tonal detection systems for language learners to automatically check the correctness of their pronunciations as they speak in real-time. This can be accomplished by using time-frequency analysis that detect its accuracy similar to these language pronunciation apps like ELSA speak for English [1][2].
It will be very helpful if someone come up with automatic tonal detection systems for language learners to automatically check the correctness of their pronunciations as they speak in real-time. This can be accomplished by using time-frequency analysis that detect its accuracy similar to these language pronunciation apps like ELSA speak for English [1][2].
[1]Time–frequency representation:
https://en.wikipedia.org/wiki/Time%E2%80%93frequency_represe...
[2] ELSA Speak:
https://elsaspeak.com/en/