Hi , thanx to those whose contributions have helped me to learn more and more , djr33 u have right when differentiating between the Phonetic Vs Phonological view to the existence of the glottal stop .... Maybe I am not as good as you are, in phonetics and phonology ,nevertheless I try to be a good one. I will make my POV in two major points.
1- I hope according to the following explanation I will offer hereunder,that we agree that phonation is can-at least-visualized as a chopping process of air stream then I will go forward to the 2nd point :
two years ago a friend of mine told me that when he reversed (on Praat) a syllable of a sonorant followed by a vowel , like (m+e ) for example he recognize the sound of (hem) , when I myself repeat this process with different combinations, the results was beyond my little understanding :with "ke' the result is '"hek"'or rather '"haik", with "'se'' the result is ''hes ''or rather ''hais'' .I dropped a question on Praat-users group , received different explanations . Endly I found a better explanation which I did accept and developed:
the reason that 'h'' occures in the reversed section of 'm+e “ is :as soon as the vocal cords stop vibration,there will come little air, occures as ''h” as secondary product because the process of "'vowel -e-'' phonation is indeed a chopping process of continouse airstream or continouse "' stream of -h- itself ''.As soon as chopping ends up i.e.vibration stops ,the 'h'' occures as a residual or by-product of this process .But if we reverse a syllable like /mes/ there will be no chance to ''h''occurrence since /s/ will follow the vowel directly.
Let me resemble the phonation process of vowel ''e'' with another natural process.If i have an ''extruder'' which pushes a stream of clay or dough,followed by a "'cutter''which performs chopping of the clay or dough at 40 times per second.I would expect that as soon as the cutter stops chopping, there still a little bar of non chopped dough passes -or escapes-through.This simulation could be a good explanation why ''h'' occures in our topic.The extruder may simulates the lungs function and the cutter for the vocal cords function. This means that the glottis function is like a chopping valve of the airstream of “h”,just like an electro- DC to AC converter .
If you accept this explanation (as I hope ) let me move to the 2nd point
2- The glottis can be more than on-off valve ,it has also a function of controlling or regulating the volume of air passing through it /per unit of time . If you give a look to the figure here on the link
http://clas.mq.edu.au/speech/phonetics/phonetics/airstream_laryngeal/pulmonic.html,you can visualize the glottis(including the vocal folds) as a multi function valve
a- converting the air stream expelled by the Lungs /through a process like chopping as above mentioned/ into complicated vocal waves
b- the glottis plays another role as a regulating valve.This regulation is done through either
complete closure or partial closure .In case of complete closure ( valve is off: infinite resistance to air flow , the air flow in “STOP POSITION” this position is responsible for the glottal stop initiation , But partial closure ( low or less resistance ) is responsible for initiation the “h' phone.We notice that “h' is very short and mostly can not exist alone without vowel because it's an air stream whose resistance is very low compared to “s” or 'f” or any other fricative (try it yourself to realize how long can h stay in your mouth ...it's indeed very short due to low resistance which( aerodynamically) points out to large volume of air/ per time unit for specific pressure of lungs.
So I think that those who claim the existence of glottal stop in the beginning of initial vowel like in “ant'” are right because they initiate their own vowel with a glottal stop ,and those who claims there is not any glottal stop in their own initial vowel are also right ,except that the 2nd discussants maybe not aware that they initiate their own vowel with “h” but so light that they don't recognize it or the initial vowels utterance is done ( abruptly) without noticing the short 'h' .
Accordingly , I would modify my previous statement where I said “”””
But for me I can not imagine the initial ''Vowel " without a starting point or preparing process, otherwise it means that the vocal cords are ever vibrating without limit, and when we pronounce initial "vowel''we only widen our mouth to let others hear it !! “”” and would say (….....without a starting point which is either glottal stop for those who initiate their own vowel with it, or with “impalpable h” for others )
According to the above-mentioed point concerning the chopping function of the vocal cords there will be no “VOICING” without airstream , and this airstream can be said as h-airstream ,so the occurrence of either “h' (directly ) or glottal stop a little moment before it ,is undoubtedly in my POV and according to the above-said reasons.
I think this is the main reason that we find a lot of words in the same family of languages ,appears sometimes with “h” consonant and other times without it (I mean with glottal stop ) .Example
Uhr(ger.)-ora(it)-hawr (welch) with h , also the example I gave before 'hotel eng.Vs otel tur.” and so on .
I would ask you to listen to these 2 german voices ,both pronounce the same word "Ende=end" and tell me whether my POV is correct or not , can u recognize who among these 2 voices has made the vowel voice onset with glottalization , and who does not !!!! Here are the voices
http://www.forvo.com/word/ende/#de