A simple python code to convert integer number to pronunciation. Use this function to pre process text before feeding it into a TTS model. Work best for number less than 1 trillion (since I have no clue how number beyond 1 trillion be pronounced in Vietnamese)

int_to_vie_pron.py

import itertools

rule_1_pronunciation_list = ['', 'mốt', 'hai', 'ba', 'tư', 'lăm', 'sáu', 'bảy', 'tám', 'chín']
rule_2_pronunciation_list = ['không', 'một', 'hai', 'ba', 'bốn', 'năm', 'sáu', 'bảy', 'tám', 'chín']

# should support decimal number, but I don't know how to pronounce decimal number correctly in Vietnamese
a = 1234567890

suffix_cycle = itertools.cycle(['', 'nghìn', 'triệu', 'tỷ'])

suffix = ''
result = ''
while a > 0:

    b = a % 1000
    suffix = next(suffix_cycle)

    b1 = b % 10
    b2 = int(b / 10) % 10
    b3 = int(b / 100)
    
    b3_pron = '' if not b3 else f'{rule_2_pronunciation_list[b3]} trăm'
    b2_pron = '' if not b2 else 'mười' if (b3 == 0) and (b2 == 1) else f'{rule_2_pronunciation_list[b2]} mươi'
    if not b3 and not b2:
        b1_pron = rule_2_pronunciation_list[b1]
    else:
        b1_pron = ('lẻ ' if not b2 else '' + rule_1_pronunciation_list[b1])
    
    pron = f'{b3_pron} {b2_pron} {b1_pron} {suffix}'.strip()
    
    result = f'{pron} {result}'
    
    
    a = int(a / 1000)
print(result)