Let's say an IPA pronunciation contains a double consonant, such as "dd" or "ss". Does that really mean this consonant should be pronounced twice?
There are examples where this would indeed be the case, such as the German word "arttypisch" /ˈaːɐ̯tˌtyːpɪʃ/ that requires two consecutive stops of the tongue for the two "t" sounds. (In this case, it's because "arttypisch" is a compound word make up from "art" and "typisch" and because pronouncing it with just one "t" would make it sound like the different word "atypisch".)
But browsing Wiktionary, I've come across many pronunciations where I suspect that speaking both consonants separately would be highly uncommon, if not outright wrong.
So I wonder:
- Is there some rule as to when a double consonant in an IPA pronunciation should be spoken twice, without knowing about the word's etymology?
- Am I right in assuming that across languages, the vast majority of cases requires the consonant to be spoken just once?
Here are some more examples: