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;;                Centre for Speech Technology Research                  ;;
;;                     University of Edinburgh, UK                       ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;           Author:  Alan W Black
;;;           Date:    August 1996
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;;  Reads in text from stdin and outputs text/pos on stdout
;;;
;;;  Designed to show how simple filters can be written in Festival
;;;
;;;  First we defined a function that processes an utterance enough
;;;  to predict part of speech, namely, tokenize it, find the words
;;;  and then run the POS tagger on it.
;;;  Then we define a function to extract the word and pos tag itself
;;;
;;;  We redefine the basic functions run on utterances during text to
;;;  speech to be our two newly-defined function and then simply
;;;  run tts on standard input.
;;;

;;; Because this is a --script type file I has to explicitly
;;; load the initfiles: init.scm and user's .festivalrc
(load (path-append libdir "init.scm"))

(define (find-pos utt)
"Main function for processing TTS utterances.  Predicts POS and
prints words with their POS"
  (Token utt)
  (POS utt)
)

(define (output-pos utt)
"Output the word/pos for each word in utt"
 (mapcar
  (lambda (pair)
    (format t "%l/%l\n" (car pair) (car (cdr pair))))
  (utt.features utt 'Word '(name pos))))

;;;
;;; Redefine what happens to utterances during text to speech 
;;;
(set! tts_hooks (list find-pos output-pos))

;;; Stop those GC messages
(gc-status nil)

;;; Do the work
(tts_file "-")



