I was told years ago by a teacher at a Carden School that they teach their students that English homonyms, especially those with diphthongs, can be told apart by the pitch profile of the vowel sound. Now I see in wiki that all English diphthongs have a falling tone. This does not necessarily mean it won't work, but it makes it a little harder to achieve. I can listen to myself talk, but my bias interferes. Is there any scholarship on this?
The example I remember is "meat" versus "meet". It was said that "ea" has a flat profile while "ee" has a rising profile. This might be relative to each other. I also think that 'pitch' may have been a paraphrase and it actually means something else like emphasis or volume?