According to Glottopedia, lexical pitch accent happens when the only indicator of an accent (aka stress) on the syllable is pitch--elevated pitch on the accented syllable. (http://www.glottopedia.org/index.php/Pitch_accent_%28lexical%29)
For example, stress in Swedish is apparently encoded as pitch, as we see in the "Stress and Pitch" section of this article on Swedish phonology. http://www.thefullwiki.org/Swedish_phonology#Stress_and_pitch According to this article, "The phonemicity of this tonal system is demonstrated in the nearly 300 pairs of two-syllable words differentiated only by their use of either grave or acute accent [which indicate tone]."
Contrast this to languages in which accent is conveyed not only by elevated pitch, but by increased loudness and duration. http://www.glottopedia.org/index.php/Accent English is such a language. So when we differentiate watching a RE-peat on TV and re-PEAT-ing an action, all three factors can come into play.
Now, as most of you know, there are languages, including Swedish, in which vowel length is also phonemic. Finnish and Swedish (no relation) both have vowels that come in long and short pairs. In fact, the article on Swedish Phonology mentioned above has some good sound files that illustrate the contrast.
My question is whether there are natural languages in which phonemic vowel length and lexical pitch accent are independent of one another, such that the language could have different lexemes with forms like these. (I'll use a <1> to indicate high tone here.)
pa:za1 paza1: pa1:za pa1za:
Swedish seems to be such a language, but the article doesn't come right out and say it.