def convert_textgrid(tg_old, sil):
tg_new = TextGrid(tg_old.start, tg_old.end)
phontier = Tier('phones', tg_old['PHONEMES'].start, tg_old['PHONEMES'].end,
'Interval',
[Interval(x.start, x.end,
convert_mark(x.mark, sil))
for x in tg_old['PHONEMES']])
wordtier = Tier('words', tg_old['WORDS'].start, tg_old['WORDS'].end,
'Interval',
[Interval(x.start, x.end,
convert_mark(x.mark, sil))
for x in tg_old['WORDS']])
tg_new.append_tier(wordtier)
tg_new.append_tier(phontier)
return tg_new
