This page will focus on making a continuum between “bit” and “bat”, primarily to illustrate the benefits of frequency anchoring. However, I have many /bVt/ words recorded that can be used as end points for many different continua around the English vowel space:
The temporal structure for creating a continuum follows that in the morphing tutorial.
You’ll notice that the region corresponding to the vowel in each sound files shows a fair bit of difference, indicative of their different formant structure. Rather than mixing the sound files directly, we’d like to shift the formants around, so we have to align the formant peaks during the vowel as below.
Listen specifically to steps 6 and 7 to hear something approximately “bet”-like, as the continuum goes through the /ɛ/ formant region.
The boundary between the two is much more abrupt and the synthesis quality is generally not as good.