###########################
###  Formant measurement
###  written by Kyuchul Yoon  2-8-2002
###  kyoon@ling.osu.edu
###########################

form Input directory name without final slash
	word dirName lees\convers1\f1\Formant
	word outFile fmt-le-c1f1.txt
endform

filedelete 'outFile$'

# parameters to Burg formant extraction
timeStep = 0.005
maxNumFormants = 5
windLength= 0.025
preEmphFrom = 50

# read in all files in the directory 'dirName$'
Create Strings as file list... list 'dirName$'\*.wav
numFiles = Get number of strings
for iFile to numFiles
	select Strings list
	fullFileName$ = Get string... iFile

	# extract token categories from filename
	conTypeI = index(dirName$, "convers")
	conType$ = mid$(dirName$, conTypeI, 8)
	fricType$ = left$(fullFileName$, 2)
	subjName$ = mid$(fullFileName$, 4, 2)
	repNum$ = mid$(fullFileName$, 7, 1)
	prosLoc$ = mid$(fullFileName$, 9, 3)
	sexType$ = mid$(fullFileName$, 4, 1)

####### Maximum formant needs to be adjusted by sex -- 	
	if sexType$ = "f" 
		maxFormant = 5500	
	else
		maxFormant = 5000
	endif

	fileName$ = fullFileName$ - ".wav"

	Read from file... 'dirName$'\'fileName$'.TextGrid

	# locate vowel onset & offset
	vowelBegin = Get time of point... 1 3

	Read from file... 'dirName$'\'fileName$'.wav

####### Burg algorithm : Applies a Gaussian-like window and computes LPC coefficients
####### Actual window length is twice the windLength$
#######	# extract formants 1 ~ 3 for the first seven frames every 5 ms
	To Formant (burg)... timeStep maxNumFormants maxFormant windLength preEmphFrom

	# extract formants 1 ~ 3 for the first six frames every 5 ms

####	for i from 1 to numFrames
	for i from 1 to 6
		
	timeFrame = vowelBegin + (i-1) * timeStep
	
	for k from 1 to 3
			
	   formantVal = Get value at time... k timeFrame Hertz Linear
	   fileappend 'outFile$' 'fileName$''tab$'
		... 'conType$''tab$'
		... 'subjName$''tab$'
		... 'fricType$''tab$'
		... 'repNum$''tab$'
		... 'prosLoc$''tab$'
		... frame'i''tab$'
		... F'k''tab$'
		... 'formantVal:0''newline$'
	endfor
endfor

	select Sound 'fileName$'
	plus TextGrid 'fileName$'
	plus Formant 'fileName$'
	Remove
endfor

select Strings list
Remove