[comp.music] Time change without pitch change, WHY?

Alvin@cup.portal.com (Alvin Henry White) (07/16/90)

The reason I want time change without pitch change is so that we can achieve
the modern equivalent of inter-linear language translation on stereo audio
channels.  Such as, you have a computer look up a clue word in a second
language, of your choice, thesaurus.  Then you have the computer speech
function determine how long it will take to synthesize the word in the
original tongue.  It then determines how long it would take to synthesize the
clue word in the second language. Next, it applies time change without pitch
change to the second language speech synthesis. and Voile. You hear the 
original song in one ear and the clue words, dubbed in the other ear, in time
to the music.  How's that for counterpoint. If the usenet goes to a multi-
lingual text stream, the inter-linear dub  would be cheaper and poorer than
translation. 

edhall@rand.org (Ed Hall) (07/17/90)

In article <31762@cup.portal.com> Alvin@cup.portal.com (Alvin Henry White) writes:
>The reason I want time change without pitch change is so that we can achieve
>the modern equivalent of inter-linear language translation on stereo audio
>channels.  Such as, you have a computer look up a clue word in a second
>language, of your choice, thesaurus.  Then you have the computer speech
>function determine how long it will take to synthesize the word in the
>original tongue.  It then determines how long it would take to synthesize the
>clue word in the second language. Next, it applies time change without pitch
>change to the second language speech synthesis. and Voile. You hear the 
>original song in one ear and the clue words, dubbed in the other ear, in time
>to the music.

How are you going to handle languages with a different word order,
like English and Japanese, or Spanish and German?  Word-for-word
translation would at least produce a large shift in meaning, if not
result in gibberish.  It just isn't that easy.  Even if it were, how
are you going to handle cases where the substitute-word has four times
as many (or fewer) syllables as the original?  A 4X speedup would
render it unintelligably fast.  A 4X slowdown would render many
diphthongs inaudible.  The most speedup or slowdown people can handle
(with practice) is a bit over 2X, even with constant pitch.

		-Ed Hall
		edhall@rand.org